TRIPLE-RESONANT NULL FREQUENCY SCANNING ANTENNA

Abstract

The present invention discloses a triple-resonant null frequency scanning antenna, which belongs to the technical fields of the Internet of Things and microwave. The triple-resonant null frequency scanning antenna comprises a circular sector magnetic dipole arranged on a medium substrate, and rectangular notches are symmetrically arranged on a sector patch of the circular sector magnetic dipole. The circular sector magnetic dipole is fixed on the medium substrate by a second shorting pin and third shorting pins, an flared angle of the circular sector magnetic dipole is a first central angle, and two third shorting pins are present and are symmetrically arranged on both sides of the angular bisector of the first central angle.

Claims

1. A triple-resonant null frequency scanning antenna, wherein the triple-resonant null frequency scanning antenna comprises a circular sector magnetic dipole (2) arranged on a medium substrate (1), and rectangular notches (4) are symmetrically arranged on a sector patch of the circular sector magnetic dipole (2); the circular sector magnetic dipole (2) is fixed on the medium substrate (1) by a second shorting pin (6) and third shorting pins (7), an flared angle of the circular sector magnetic dipole (2) is a first central angle (11), and two third shorting pins (7) are present and are symmetrically arranged on two sides of the angular bisector of the first central angle (11); three resonance points are formed through the cooperation between the circular sector magnetic dipole, the shorting pins and the notches; and the circular sector magnetic dipole (2) is connected to a parasitic sector magnetic dipole (3) by a vertical shorting wall (9), and the parasitic sector magnetic dipole (3) is fixed on the medium substrate (1) by a first shorting pin (5).

2. The triple-resonant null frequency scanning antenna according to claim 1, wherein an flared angle of the parasitic sector magnetic dipole (3) is a second central angle (10), and the sum of the first central angle (11) and the second central angle (10) is 360°.

3. The triple-resonant null frequency scanning antenna according to claim 2, wherein the first central angle (11) is greater than 180° and less than 350°, and the second central angle (10) is greater than 10° and less than 180°.

4. The triple-resonant null frequency scanning antenna according to claim 2, wherein both the circular sector magnetic dipole (2) and the parasitic sector magnetic dipole (3) are of non-closed structures, and the circular sector magnetic dipole (2) is as high as the parasitic sector magnetic dipole (3).

5. The triple-resonant null frequency scanning antenna according to claim 1, wherein the rectangular notches (4) have a length of 10 mm to 30 mm, a width of 5 mm to 10 mm and a rotation angle of 30° to 90°.

6. The triple-resonant null frequency scanning antenna according to claim 1, wherein a feed element (8) is arranged on the circular sector magnetic dipole (2), and the feed element (8) is a coaxial line.

7. The triple-resonant null frequency scanning antenna according to claim 4, wherein the distance from the circular sector magnetic dipole (2) to the medium substrate (1) is 3 mm to 7 mm, and the edge length of the circular sector magnetic dipole (2) is 2 to 5 times a wavelength.

8. The triple-resonant null frequency scanning antenna according to claim 1, wherein the permittivity of the medium substrate (1) is 1 to 20.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG. 1 shows a schematic diagram of antenna's front structure and reference coordinate;

[0017] FIG. 2 shows a three-dimensional schematic diagram of the antenna and a schematic diagram of a reference coordinate;

[0018] FIG. 3 shows the standing-wave ratio characteristic of the antenna simulated by HFSS software;

[0019] FIG. 4 shows a radiation pattern of the antenna simulated by HFSS software.

[0020] Numerals in the drawings: 1. medium substrate; 2. circular sector magnetic dipole; 3. parasitic sector magnetic dipole; 4. rectangular notches; 5. first shorting pin; 6. second shorting pin; 7. third shorting pins; 8. feed element; 9. shorting wall; 10. second central angle; 11. first central angle.

DETAILED DESCRIPTION

[0021] In order to better understand the content of the patent for invention, the technical solution of the present invention will be further illustrated with reference to the drawings and specific embodiments.

[0022] As shown in FIG. 1 and FIG. 2, a triple-resonant null frequency scanning antenna comprises a circular sector magnetic dipole 2 and a parasitic sector magnetic dipole 3 arranged on a medium substrate 1, two rectangular notches 4 are symmetrically arranged on the circular sector magnetic dipole 2, and triple-resonant null frequency scanning antenna unitizes a combination of the circular sector magnetic dipole 2 and shorting pins and the arrangement of rectangular silts 4. The shorting pins comprise a first shorting pin 5, a second shorting pin 6, and third shorting pins 7.

[0023] The circular sector magnetic dipole 2 is of a non-closed structure and comprises a first sector patch, the medium substrate 1, and a vertical shorting wall 9 connecting straight edges of the first sector patch and the medium substrate 1. The two rectangular notchs 4 are symmetrically arranged on the sector patch of the circular sector magnetic dipole 2, and the sector patch is fixed on the medium substrate 1 by the second shorting pin 6 and the third shorting pins 7, wherein two third shorting pins 7 are present and are symmetrically arranged on two sides of the angular bisector of the first central angle 11.

[0024] The parasitic sector magnetic dipole 3 is of a non-closed structure and comprises a second sector patch, the medium substrate 1, and the vertical shorting wall 9 connecting the straight edges of the second sector patch and the medium substrate 1, wherein the second sector patch is connected to the medium substrate 1 by the first shorting pin 5.

[0025] The circular sector magnetic dipole 2 is as high as the parasitic sector magnetic dipole 3, and the circular sector magnetic dipole 2 is provided with a feed structure. The radii of the circular sector magnetic dipole 2 and the parasitic sector magnetic dipole 3 can be changed.

[0026] The length, width and rotation angle of each rectangular notch 4 can be changed within a length range from 10 mm to 30 mm, a width range from 5 mm to 10 mm and a rotation angle range from 30° to 90°, respectively.

[0027] The feed element 8 is a coaxial line. The distance from the circular sector magnetic dipole 2 to the medium substrate 1 can be changed within a range from 3 mm to 7 mm. The permittivity of the medium substrate 1 is 1 to 20.

[0028] The sum of the first central angle 11 and a second central angle 10 is 360°. An flared angle of the circular sector magnetic dipole 2 is the first central angle 11, and the first central angle 11 is greater than 180° and less than 350°. A flared angle of the parasitic sector magnetic dipole 3 is the second central angle 10, and the second central angle 10 is greater than 10° and less than 180®. The edge length of the circular sector magnetic dipole 2 is 2 to 5 times a wavelength.

[0029] Air medium is adopted in the present embodiment. The length of the medium substrate 1 is 150 mm. The spacing between the two sector magnetic dipoles and the medium substrate 1 is 5 mm. The radius of the circular sector magnetic dipole 2 is 60 mm, and the radius of the parasitic sector magnetic dipole 3 is 48 mm. The degree of the first central angle 11 is 240°, and the degree of the second central angle 10 is 120°. The two rectangular notches 4 on the circular sector magnetic dipole are 25 mm in length and 7.4 mm in width. A feed point is 40 mm away from the circle center on the central axis of the structure of the circular sector magnetic dipole 2. The included angles between both shorting pins 7 and the x axis are 40°. Each characteristic of the antenna is simulated by simulation with HFSS software.

[0030] FIG. 3 shows the voltage standing-wave ratio characteristic of the antenna calculated by HFSS software, and the standing-wave ratio of the antenna is less than 3 within a frequency band from 2.05 GHz to 2.97 GHz.

[0031] FIG. 4 shows a radiation pattern of the antenna calculated by HFSS software, wherein the dotted line denotes a pattern at the frequency of 2.08 GHz, and a null appears at an elevation angle of 51°; the dot-dash line denotes a pattern at the frequency of 2.4 GHz, and a null appears at the zenith (an elevation angle of 0°); and the solid line denotes a pattern at the frequency of 2.8 GHz, and a null appears at an elevation angle of −50°. Therefore, within the frequency band range from 2.08 GHz to 2.80 GHz, the range of null scanning angle can reach more than 100°.

[0032] Those skilled in the art can understand that, unless otherwise defined, all the terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms, such as those defined in a general dictionary, should be construed to have meanings consistent with those in the context of the prior art, and will not be explained in idealized or overly formal meanings, unless defined as herein.

[0033] What is described above is only a specific embodiment of the present invention, and the protection scope of the present invention is not limited to this. Any transformation or substitution which can be understood or thought of by those familiar with this technology within the technical scope disclosed by the present invention shall fall within the coverage of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.