Dual-polarized antenna, radio frequency front-end apparatus, and communications device

Abstract

This application discloses a dual-polarized antenna, a radio frequency front-end apparatus, and a communications device. The dual-polarized antenna is a planar antenna, and a maximum radiation direction of the dual-polarized antenna is parallel to an antenna plane. A radio frequency circuit may be disposed at a side opposite to the maximum radiation direction of the dual-polarized antenna and located on a same circuit board as the dual-polarized antenna. A low profile feature is implemented, and the radio frequency circuit and the dual-polarized antenna do not need to be connected by using an interconnection plug, thereby reducing an insertion loss and reducing an assembly difficulty.

Claims

1. A dual-polarized antenna, comprising an H-plane horn antenna and a planar end-fire antenna, wherein the dual-polarized antenna is a planar antenna, a polarization direction of the H-plane horn antenna is perpendicular to an antenna plane of the dual-polarized antenna, polarization direction of the planar end-fire antenna is parallel to the antenna plane, the polarization direction of the H-plane horn antenna is perpendicular to the polarization direction of the planar end-fire antenna, a maximum radiation direction of the dual-polarized antenna is parallel to the antenna plane, and the maximum radiation direction of the dual-polarized antenna is perpendicular to the polarization direction of the H-plane horn antenna and the polarization direction of the planar end-fire antenna.

2. The antenna according to claim 1, wherein the H-plane horn antenna comprises a first feeding part, a metal via hole array, a first metal floor, and a second metal floor, the metal via hole array comprises a first metal via hole array and a second metal via hole array, the first metal floor and the second metal floor are parallel to the antenna plane, the first metal floor is parallel to the second metal floor, the metal via hole array is located between the first metal floor and the second metal floor, a top end of each metal via hole in the metal via hole array is electrically connected to the first metal floor, a bottom end of each metal via hole is connected to the second metal floor, the first metal via hole array and the second metal via hole array are perpendicular to the first metal floor and the second metal floor, the first metal floor, the second metal floor, and the metal via hole array form a waveguide cavity, the first feeding part is configured to feed the waveguide cavity, the planar end-fire antenna comprises a second feeding part and a radiation patch, the second feeding part is configured to feed the radiation patch, and the radiation patch is parallel to the first metal floor and the second metal floor.

3. The antenna according to claim 2, wherein a distance between the first metal via hole array and the second metal via hole array first remains unchanged at a first portion between the first metal via hole array and the second metal via hole array, and then gradually increases linearly at a second portion between the first metal via hole array and the second metal via hole array.

4. The antenna according to claim 2, further comprising a first dielectric plate, a second dielectric plate, a first feeding layer, and a second feeding layer, wherein the first dielectric plate is disposed on a lower surface of the first metal floor, the first feeding layer is disposed on an upper surface of the first metal floor, the second dielectric plate is disposed on an upper surface of the second metal floor, the second feeding layer is disposed between a lower surface of the first dielectric plate and an upper surface of the second dielectric plate, the radiation patch is disposed between a lower surface of the second feeding layer and the upper surface of the second dielectric plate, and the second feeding part is disposed between an upper surface of the second feeding layer and a lower surface of the first dielectric plate.

5. The antenna according to claim 4, wherein the first feeding part comprises a first microstrip and a feeding probe, wherein the first microstrip is electrically connected to the feeding probe, the first microstrip is disposed on an upper surface of the first feeding layer, a through hole perpendicular to the first feeding layer is disposed on the upper surface of the first feeding layer, the feeding probe is located in the through hole, the second feeding part comprises a second microstrip, wherein the second microstrip is disposed between the lower surface of the first dielectric plate and the upper surface of the second feeding layer, and the second microstrip is in the waveguide cavity.

6. The antenna according to claim 5, wherein the planar end-fire antenna is a Vivaldi antenna, a rectangular area and a horn-shaped area that are in communication with each other are formed in an area that is of the upper surface of the second dielectric layer and that is not covered by the radiation patch, and a horn mouth of the horn-shaped area is perpendicular to the maximum radiation direction.

7. The antenna according to claim 5, wherein the second microstrip comprises two strips that are perpendicular to each other.

8. The antenna according to claim 2, further comprising a first dielectric plate and a second dielectric plate, wherein the first metal floor is disposed between a lower surface of the first dielectric plate and an upper surface of the second dielectric plate, and the second metal floor is disposed on a lower surface of the second dielectric plate.

9. The antenna according to claim 8, wherein the first feeding part comprises a first microstrip and a feeding probe, the first microstrip is disposed on an upper surface of the first dielectric plate, the first microstrip is electrically connected to the feeding probe, a through hole is disposed on the upper surface of the first dielectric plate, the feeding probe is located in the through hole, the second feeding part comprises a second microstrip, and the second microstrip and the radiation patch are disposed on the first dielectric plate.

10. A radio frequency front-end apparatus, comprising a radio frequency circuit board, a radio frequency circuit, and a dual-polarized antenna, wherein the dual-polarized antenna and the radio frequency circuit are disposed on the radio frequency circuit board, an antenna plane of the dual-polarized antenna is parallel to the radio frequency circuit board, the dual-polarized antenna is a planar antenna, a polarization direction of the H-plane horn antenna is perpendicular to an antenna plane of the dual-polarized antenna, a polarization direction of the planar end-fire antenna is parallel to the antenna plane, the polarization direction of the H-plane horn antenna is perpendicular to the polarization direction of the planar end-fire antenna, a maximum radiation direction of the dual-polarized antenna is parallel to the antenna plane, and the maximum radiation direction of the dual-polarized antenna is perpendicular to the polarization direction of the H-plane horn antenna and the polarization direction of the planar end-fire antenna.

11. The apparatus according to claim 10, wherein the H-plane horn antenna comprises a first feeding part, a metal via hole array, a first metal floor, and a second metal floor, wherein the metal via hole array comprises a first metal via hole array and a second metal via hole array, the first metal floor and the second metal floor are parallel to the antenna plane; the first metal floor is parallel to the second metal floor, the metal via hole array is located between the first metal floor and the second metal floor, a top end of each metal via hole in the metal via hole array is electrically connected to the first metal floor, a bottom end of each metal via hole is connected to the second metal floor, the first metal via hole array and the second metal via hole array are perpendicular to the first metal floor and the second metal floor, the first metal floor, the second metal floor, and the metal via hole array form a waveguide cavity, the first feeding part is configured to feed the waveguide cavity, the planar end-fire antenna comprises a second feeding part and a radiation patch, the second feeding part is configured to feed the radiation patch, and the radiation patch is parallel to the first metal floor and the second metal floor.

12. The apparatus according to claim 11, wherein a distance between the first metal via hole array and the second metal via hole array first remains unchanged at a first portion between the first metal via hole array and the second metal via hole array, and then gradually increases linearly at a second portion between the first metal via hole array and the second metal via hole array.

13. The apparatus according to claim 11, wherein the dual-polarized antenna further comprising a first dielectric plate, a second dielectric plate, a first feeding layer, and a second feeding layer, the first dielectric plate is disposed on a lower surface of the first metal floor, the first feeding layer is disposed on an upper surface of the first metal floor, the second dielectric plate is disposed on an upper surface of the second metal floor, the second feeding layer is disposed between a lower surface of the first dielectric plate and an upper surface of the second dielectric plate, the radiation patch is disposed between a lower surface of the second feeding layer and the upper surface of the second dielectric plate, and the second feeding part is disposed between an upper surface of the second feeding layer and a lower surface of the first dielectric plate.

14. The apparatus according to claim 13, wherein the first feeding part comprises a first microstrip and a feeding probe, the first microstrip is electrically connected to the feeding probe, the first microstrip is disposed on an upper surface of the first feeding layer, a through hole perpendicular to the first feeding layer is disposed on the upper surface of the first feeding layer, the feeding probe is located in the through hole, the second feeding part comprises a second microstrip, the second microstrip is disposed between the lower surface of the first dielectric plate and the upper surface of the second feeding layer, and the second microstrip is in the waveguide cavity.

15. The apparatus according to claim 14, wherein the planar end-fire antenna is a Vivaldi antenna, a rectangular area and a horn-shaped area that are in communication with each other are formed in an area that is of the upper surface of the second dielectric layer and that is not covered by the radiation patch, and a horn mouth of the horn-shaped area is perpendicular to the maximum radiation direction.

16. The apparatus according to claim 14, wherein the second microstrip comprises two strips that are perpendicular to each other.

17. The apparatus according to claim 11, the dual-polarized antenna further comprising a first dielectric plate and a second dielectric plate, wherein the first metal floor is disposed between a lower surface of the first dielectric plate and an upper surface of the second dielectric plate, and the second metal floor is disposed on a lower surface of the second dielectric plate.

18. The apparatus according to claim 17, wherein the first feeding part comprises a first microstrip and a feeding probe, the first microstrip is disposed on an upper surface of the first dielectric plate, the first microstrip is electrically connected to the feeding probe, a through hole is disposed on the upper surface of the first dielectric plate, the feeding probe is located in the through hole; the second feeding part comprises a second microstrip, and the second microstrip and the radiation patch are disposed on the first dielectric plate.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) To describe the technical solutions in embodiments of the present invention or in the background more clearly, the following briefly describes the accompanying drawings required for describing the embodiments of the present invention or the background.

(2) FIG. 1a is a schematic plan view of a related art dual-polarized antenna;

(3) FIG. 1b is a schematic side view of the related art dual-polarized antenna;

(4) FIG. 2a is a schematic structural diagram of a radio frequency front-end apparatus according to an embodiment of the present invention;

(5) FIG. 2b is another schematic structural diagram of a radio frequency front-end apparatus according to an embodiment of the present invention;

(6) FIG. 2c is another schematic structural diagram of a radio frequency front-end apparatus according to an embodiment of the present invention;

(7) FIG. 3a is a schematic assembly perspective view of a dual-polarized antenna according to an embodiment of the present invention;

(8) FIG. 3b is a schematic side view of a dual-polarized antenna according to an embodiment of the present invention;

(9) FIG. 3c is a schematic plan view of a dual-polarized antenna according to an embodiment of the present invention;

(10) FIG. 4a is another schematic assembly perspective view of a dual-polarized antenna according to an embodiment of the present invention;

(11) FIG. 4b is another schematic side view of a dual-polarized antenna according to an embodiment of the present invention;

(12) FIG. 4c is another schematic plan view of a dual-polarized antenna according to an embodiment of the present invention; and

(13) FIG. 5a to FIG. 5d are electric field radiation patterns of a dual-polarized antenna according to an embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

(14) The following describes embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention.

(15) A communications device in this application is a device having a wireless communications function, and may be a handheld device, a vehicle-mounted device, wearable equipment, a computing device that has the wireless communications function, another processing device connected to a wireless modem, or the like. In different networks, a terminal device may have different names, for example, user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile console, a remote station, a remote end, a mobile device, a user terminal, a terminal, a wireless communications device, a user agent or a user apparatus, a cellular phone, a cordless telephone set, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), and a terminal device in a 5G network or a future evolved network.

(16) The communications device in this application may also be a device that is deployed in a radio access network and that is configured to provide the wireless communications function, and the communications device includes but is not limited to a base station (for example, a base transceiver station (BTS)), a Node B (NB), an evolved Node B (eNB, or eNodeB), a transmission node, a transmission reception point (TRP or TP), or a next generation Node B (gNB) in a NR system, or a base station or a network device in a future communications network), a relay site, an access point, a vehicle-mounted device, wearable equipment, a wireless-fidelity (Wi-Fi) site, a radio backhaul node, a small cell, a micro cell, or the like.

(17) Referring to FIG. 2a to FIG. 2c, FIG. 2a is a schematic front view of a radio frequency front-end apparatus according to an embodiment of the present invention. The radio frequency front-end apparatus includes a radio frequency circuit, a dual-polarized antenna, and a radio frequency circuit board. The radio frequency circuit and the dual-polarized antenna are disposed on the radio frequency circuit board, the dual-polarized antenna is a planar antenna, an antenna plane of the dual-polarized antenna is a plane in which an upper surface of the dual-polarized antenna is located. The dual-polarized antenna includes an H-plane horn antenna and a planar end-fire antenna (not shown in FIG. 2a), a polarization direction of the H-plane horn antenna is perpendicular to an antenna plane of the dual-polarized antenna. For example, as shown in FIG. 2a, the polarization direction of the H-plane horn antenna is perpendicular to the antenna plane and extends inward. The planar end-fire antenna is an antenna of which a polarization direction is parallel to the antenna plane. For example, the planar end-fire antenna includes but is not limited to a Vivaldi antenna, a planar Yagi antenna, a planar log-periodic antenna, or the like. The planar end-fire antenna in this embodiment is parallel to the antenna plane of the dual-polarized antenna, and the antenna plane is also parallel to the radio frequency circuit board. For example, as shown in FIG. 2a, a shape of the dual-polarized antenna is a rectangle, and the planar end-fire antenna is parallel to the antenna plane of the dual-polarized antenna and perpendicular to a bottom edge of the dual-polarized antenna. A maximum radiation direction of the dual-polarized antenna is a direction of a main lobe in an antenna pattern. In this embodiment, the maximum radiation direction of the dual-polarized antenna is parallel to the antenna plane, and the maximum radiation direction is perpendicular to the polarization direction of the H-plane horn antenna and a direction of the planar end-fire antenna. For example, the shape of the dual-polarized antenna shown in FIG. 2a is the rectangle. The maximum radiation direction of the dual-polarized antenna is parallel to the antenna plane and perpendicular to the polarization direction of the planar end-fire antenna and the polarization direction of the H-plane horn antenna, and the maximum radiation direction is perpendicular to a right side edge of the dual-polarized antenna.

(18) The radio frequency circuit is configured to: send a generated electromagnetic wave signal and process a received electromagnetic wave signal. To reduce interference caused by the dual-polarized antenna to the radio frequency circuit, the radio frequency circuit is located behind the maximum radiation direction of the dual-polarized antenna. For example, if a shape of the radio frequency circuit is a rectangle, and the maximum radiation direction of the dual-polarized antenna is parallel to the radio frequency circuit board and perpendicular to the right side edge of the dual-polarized antenna, the radio frequency circuit is adjacent to a left side edge of the dual-polarized direction.

(19) According to this embodiment of the present invention, the dual-polarized antenna includes the H-plane horn antenna and a planar antenna, the maximum radiation direction of the dual-polarized antenna is parallel to the antenna plane, and the maximum radiation direction is orthogonal to the two polarization directions. Therefore, the radio frequency circuit and the dual-polarized antenna may be disposed on a same radio frequency circuit board, so that problems of a high loss, insufficient space, and a high process requirement that are caused when an antenna interconnection interface is introduced into the related art radio frequency front-end apparatus are avoided.

(20) FIG. 2b is a schematic side view of a radio frequency front-end apparatus according to an embodiment of the present invention. In this embodiment of the present invention, the radio frequency front-end apparatus includes a radio frequency circuit board having a multi-layer structure, one radio frequency circuit and one dual-polarized antenna are disposed on each layer of circuit board, and a plurality of dual-polarized antennas form an antenna array. Different dual-polarized antennas in the antenna array have a same polarization direction and a same maximum radiation direction. For a location relationship between two polarization directions and a maximum radiation direction of each dual-polarized antenna, refer to the description of FIG. 2a. Details are not described herein again.

(21) In this embodiment of the present invention, the plurality of dual-polarized antennas are enabled, by using a circuit board having a multi-layer structure, to be arranged on a radio frequency front-end module in a form of an array, so that a feature of a high gain can be ensured while a feature of a low profile is implemented, and the antenna array can form a phased array for angle scanning.

(22) FIG. 2c is a schematic front view of a radio frequency front-end apparatus according to an embodiment of the present invention. In this embodiment of the present invention, the radio frequency front-end apparatus includes a radio frequency circuit board, and a radio frequency circuit and four dual-polarized antennas disposed on the radio frequency circuit board. The four dual-polarized antennas are distributed around the radio frequency circuit, and the four dual-polarized antennas are all planar antennas. A dual-polarized antenna 1 is located on an upper side of the radio frequency circuit, a dual-polarized antenna 2 is located on a right side of the radio frequency circuit, a dual-polarized antenna 3 is located on a lower side of the radio frequency circuit, and a dual-polarized antenna 4 is located on a left side of the radio frequency circuit. For a location relationship between a polarization direction and a maximum radiation direction of each dual-polarized antenna, refer to the description of FIG. 2a. Details are not described herein again. It should be noted that maximum radiation directions of two opposite dual-polarized antennas are in opposite directions. For example, the dual-polarized antenna 1 and the dual-polarized antenna 3 that are at opposite sides have opposite maximum radiation directions, and the dual-polarized antenna 2 and the dual-polarized antenna 4 that are at opposite sides have opposite maximum radiation directions. In addition, maximum radiation directions of the four polarized antennas are divergent outward by using the radio frequency circuit as a center.

(23) Optionally, a shape of the radio frequency circuit is a rectangle. A maximum radiation direction of the dual-polarized antenna 1 is perpendicular to a top edge of the radio frequency circuit, a maximum radiation direction of the dual-polarized antenna 3 is perpendicular to a bottom edge of the radio frequency circuit, a maximum radiation direction of the dual-polarized antenna 2 is perpendicular to a right edge of the radio frequency circuit, and a maximum radiation direction of the dual-polarized antenna 4 is perpendicular to a left side of the radio frequency circuit. A control unit in a terminal device may implement functions such as omnidirectional radiation or angle scanning by controlling enabling or disabling of one or more dual-polarized antennas.

(24) FIG. 3a to FIG. 3c are schematic structural diagrams of a dual-polarized antenna according to an embodiment of the present invention. In this embodiment of the present invention, the dual-polarized antenna includes an H-plane horn antenna and a planar end-fire antenna, and the H-plane horn antenna includes a first feeding part, a metal via hole array V1, a metal floor G1, and a metal floor G2. The dual-polarized antenna includes a second feeding part and a radiation patch R1.

(25) An antenna plane of the dual-polarized antenna is parallel to the metal floor G1 and the metal floor G2. The metal via hole array V1 includes a first metal via hole array and a second metal via hole array that are oppositely placed. Optionally, the first metal via hole array is parallel to the second metal via hole array. Alternatively, a distance between the first metal via hole array and the second metal via hole array gradually increases linearly. Alternatively, a distance between the first metal via hole array and the second metal via hole array first remains unchanged, and then gradually increases linearly. The metal via hole array V1 includes a plurality of metal via holes. The metal via hole array V1 is located between the metal floor G1 and the metal floor G1. A top end of each metal via hole is connected to the metal floor G1, and a bottom end of each metal via hole is connected to the metal floor G2. The first metal via hole array, the second metal via hole array, the metal floor G1, and the metal floor G1 form a waveguide cavity. The first metal via hole array and the second metal via hole array are used as two side walls of the waveguide cavity, the metal floor G1 is used as a top surface of the waveguide cavity, and the metal floor G2 is used as a bottom surface of the waveguide cavity. The first feeding part is configured to feed the waveguide cavity, to excite the waveguide cavity to generate an electromagnetic wave signal. The radiation patch is parallel to the metal floor G1 and the metal floor G2, and the second feeding part is configured to feed the radiation patch R1, to excite the radiation patch to generate an electromagnetic wave signal.

(26) Optionally, referring to a schematic side view of the dual-polarized antenna shown in FIG. 3b, the dual-polarized antenna further includes a dielectric plate L1, a dielectric plate L2, a feeding layer F1, and a feeding layer F2. The antenna plane may be the feeding layer F1. In sequence from top to bottom, a location relationship between layers is: the feeding layer F1, the metal floor G1, the dielectric plate L1, the feeding layer F2, the dielectric plate L2, and the metal floor G2. The dielectric plate L1 and the dielectric plate 2 may be formed by laminating a plurality of layers of dielectric plates. The dielectric plate L1 and the dielectric plate L2 may be made from same dielectric materials. The feeding layer F1 and the feeding layer F2 may also be formed by dielectric materials. The feeding layer F1 and the feeding layer F2 may also be formed by dielectric materials. The dielectric plate L1 is disposed on a lower surface of the metal floor G1, and the feeding layer F1 is disposed on an upper surface of the metal floor G1. Optionally, the dielectric plate L1 completely covers the lower surface of the metal floor G1, and the feeding layer F1 completely covers the upper surface of the metal floor G1. The dielectric plate L2 is disposed on the upper surface of the metal floor G1. For example, the dielectric plate L2 completely covers the upper surface of the metal floor G1. The radiation patch R1 is attached to an upper surface of the dielectric plate L2, the radiation patch R1 does not completely cover the dielectric plate L2, and the second feeding part is disposed on a lower surface of the dielectric plate L1. The feeding layer F2 is located between a second radiation part and the radiation patch R1. Optionally, a shape and a size of the feeding layer F2 are the same as those of the dielectric plate L1 and the dielectric plate L. Optionally, referring to FIG. 3b, the planar end-fire antenna is a Vivlaldi antenna. Because the radiation patch R1 does not completely cover the dielectric plate L2, an area that is of the dielectric plate L2 and that is not covered by a radiation patch R1 includes a rectangular area and a horn-shaped area that are in communication with each other, and a maximum radiation direction of the dual-polarized antenna is perpendicular to a horn mouth of the horn-shaped area.

(27) Further, optionally, the first feeding part includes a microstrip S1 and a feeding probe V2. The microstrip S1 is connected to the feeding probe V2, the microstrip S1 covers an upper surface of the feeding layer F1, one vertical through hole is disposed from the feeding layer F1 to the metal floor G2, and the feeding probe V2 is disposed in the through hole. The planar end-fire antenna is the Vivlaldi antenna, the microstrip S2 covers an upper surface of the feeding layer F2, the microstrip S2 is located in the waveguide cavity, and the microstrip S2 excites the radiation patch R1 to generate a polarization direction parallel to the dielectric plates. Optionally, the microstrip S2 includes two perpendicular strips.

(28) According to the foregoing embodiment, the dual-polarized antenna is the planar antenna, the dual-polarized antenna includes the H-plane horn antenna based on an SIW and the Vivlaldi antenna, the maximum radiation direction of the dual-polarized antenna is parallel to the antenna plane and perpendicular to the horn mouth, a polarization direction of the H-plane horn antenna is perpendicular to the antenna plane and perpendicular to the maximum radiation direction, and a polarization direction of the Vivlaldi antenna is parallel to the antenna plane and perpendicular to the maximum radiation direction. In this way, the radio frequency circuit may be disposed at a side opposite to the maximum radiation direction of the dual-polarized antenna, and is located on a same circuit board as the dual-polarized antenna, a feature of a low profile is implemented, and the radio frequency circuit and the dual-polarized antenna do not need to be connected by using an interconnection plug, thereby reducing an insertion loss and reducing an assembly difficulty.

(29) FIG. 4a to FIG. 4c are other schematic structural diagrams of a dual-polarized antenna according to an embodiment of the present invention. In this embodiment of the present invention, the dual-polarized antenna includes an H-plane horn antenna and a planar end-fire antenna, the H-plane horn antenna includes a metal via hole array V1, a metal floor G1, a metal floor G2, and a first feeding part, and the planar end-fire antenna includes a second feeding part and a radiation patch R1. An antenna plane of the dual-polarized antenna is parallel to the metal floor G1 and the metal floor G2.

(30) The metal floor G1 is parallel to the metal floor G2, the metal via hole array V1 is disposed between the metal floor G1 and the metal floor G2, the metal via hole array V1 includes three metal via hole arrays that are in a shape of a half-encircled rectangle, the metal via hole array V1 is located between the metal floor G1 and the metal floor G1, the metal via hole array V1 includes a plurality of metal via holes perpendicular to the metal floor G1 and the metal floor G2, a top end of each metal via hole is connected to the metal floor G1, and a bottom end of each metal via hole is connected to the metal floor G2. The metal floor G1, the metal floor G2, and the metal via hole array V1 form a waveguide cavity, the metal via hole array V1 is used as a side wall of the waveguide cavity, the metal floor G1 is used as a top surface of the waveguide cavity, and the metal floor G2 is used as a bottom surface of the waveguide cavity. The first feeding part is configured to feed the waveguide cavity, to excite the waveguide cavity to generate an electromagnetic wave signal, where a polarization direction of the generated electromagnetic wave signal is perpendicular to the antenna plane. The radiation patch R1 is parallel to the metal floor G1 and the metal floor G2, and the second feeding part is configured to feed the radiation patch R1, to excite the radiation patch R1 to generate an electromagnetic wave signal.

(31) Optionally, FIG. 4b is a schematic side view of the dual-polarized antenna. The dual-polarized antenna further includes a dielectric plate L1 and a dielectric plate L2. The antenna plane of the dual-polarized antenna is the dielectric plate L1, the dielectric plate L1 is located on an upper layer of the metal floor G1, the dielectric plate L2 is located between the metal floor G1 and the metal floor G2, and a plurality of through holes for the metal via hole array V1 to pass through are disposed on the dielectric plate L2.

(32) Further, optionally, FIG. 4c is a schematic front view of the dual-polarized antenna. The first feeding part includes a microstrip S1 and a feeding probe V2. A through hole is disposed on an upper surface of the dielectric plate L1, and the feeding probe V2 is located in the through hole. The planar end-fire antenna is a Yagi antenna, the second feeding part includes a microstrip S2, the microstrip S2 may be an S-shaped cable, and the radiation patch R1 is disposed on the upper surface of the dielectric plate L1, where the radiation patch R1 may include a plurality of metal patches parallel to a horn mouth of the H-plane horn antenna.

(33) In conclusion, according to this embodiment of the present invention, the dual-polarized antenna is the planar antenna, the dual-polarized antenna includes the H-plane horn antenna based on an SIW and the Yagi antenna, a maximum radiation direction of the dual-polarized antenna is parallel to an antenna plane and perpendicular to the horn mouth, a polarization direction of the H-plane horn antenna is perpendicular to the antenna plane and perpendicular to the maximum radiation direction, and a polarization direction of the Yagi antenna is parallel to the antenna plane and perpendicular to the maximum radiation direction. In this way, the radio frequency circuit may be disposed at a side opposite to the maximum radiation direction of the dual-polarized antenna, and is located on a same circuit board as the dual-polarized antenna, a feature of a low profile is implemented, and the radio frequency circuit and the dual-polarized antenna do not need to be connected by using an interconnection plug, thereby reducing an insertion loss and reducing an assembly difficulty. In addition, in this embodiment, a feeding layer does not need to be introduced in the dual-polarized antenna, thereby reducing a thickness of the antenna.

(34) FIG. 5a to FIG. 5d are electric field radiation patterns of a dual-polarized antenna according to an embodiment of the present invention. In this embodiment of the present invention, a three-dimensional coordinate system is set for the dual-polarized antenna, and an antenna plane is parallel to a YOZ plane. FIG. 5a is an electric field radiation pattern of an H-plane horn antenna in an XOZ plane, FIG. 5b is an electric field radiation pattern of the H-plane horn antenna in a YOZ plane, FIG. 5c is an electric field radiation pattern of a planar end-fire antenna in the XOZ plane, and FIG. 5d is an electric field radiation pattern of the planar end-fire antenna in the YOZ plane.

(35) It can be learned that maximum radiation directions of the H-plane horn antenna and the planar end-fire antenna are both +Z-axis directions, and the maximum radiation directions are parallel to the antenna plane (that is, the YOZ plane). A direction of a maximum electric field of the H-plane horn antenna is an X-axis direction and is perpendicular to the antenna plane, and polarization in one direction (for example, vertical polarization) is implemented. A direction of a maximum electric field of the planar end-fire antenna is a Y-axis direction and is parallel to the antenna plane, and polarization in another direction (for example, horizontal polarization) orthogonal to the polarization direction of the H-plane horn antenna is implemented.

(36) In the foregoing implementations, schematic structural diagrams or schematic simulation diagrams are merely examples for describing the technical solutions of the present invention, and the size proportion and the simulation value do not constitute a limitation on the protection scope of the technical solutions. Any modification, equivalent replacement, and improvement made without departing from the spirit and principle of the foregoing implementations shall fall within the protection scope of the technical solutions.