Base station antennas include a main module that has a first backplane that includes a first reflector. A vertically-extending array of first radiating elements is mounted to extend forwardly from the first reflector, and at least one first RF port is coupled to the vertically-extending array of first radiating elements. These antennas further include a sub-module that is attached to the first backplane. The sub-module includes a second backplane that has a second reflector that is separate from the first reflector. A vertically-extending array of second radiating elements is mounted to extend forwardly from the second reflector and is transversely spaced-apart from the vertically-extending array of first radiating elements. A plurality of second RF ports are coupled to the vertically-extending array of second radiating elements. The vertically-extending array of first radiating elements and the vertically-extending array of second radiating elements are configured to serve a common sector of a base station.

A signal radiation device and an antenna structure are provided. The signal radiation device includes a first signal radiator, a second signal radiator, and a reflective signal radiator. The first signal radiator is configured to perform a transceiving operation on a first signal along a first direction. The second signal radiator is disposed by overlapping with the first signal radiator, and is configured to perform the transceiving operation on at least one second signal along a second direction and/or a third direction. The first direction, the second direction, and the third direction are different. The reflective signal radiator is disposed between the first signal radiator and the second signal radiator, and is configured to perform the transceiving operation on a third signal omnidirectionally. A frequency band of the third signal is lower than a frequency band of the first signal and a frequency band of the second signal.

The present invention provides wideband millimeter-wave SIW-fed FPC filtering antenna comprising a partially reflecting surface (PRS) and a filtering source configured to radiate a millimeter-wavelength electromagnetic wave. The filtering source comprises a conductive reflecting plane configured to work with the PRS to form a Fabry-Perot cavity; radiating elements including a pair of shorted radiating patches electrically connected to a ground plane through a pair of probes; and a substrate integrated waveguide (SIW) feeding structure coupled to the pair of radiating patches through a coupling aperture. The SIW-fed FPC filtering antenna has the advantages of wider bandwidth, higher directivity/gain, reduced structural complexity, compact size and appropriate feeding type for millimeter-wave applications.

Base station antennas include an externally accessible active antenna module releasably coupled to a recessed segment that is over a chamber in the base station antenna and that is longitudinally and laterally extending along and across a rear of a base station antenna housing. The base station antenna housing has a passive antenna assembly that cooperates with the active antenna module.

Base station antennas include an externally accessible active antenna module releasably coupled to a recessed segment that is over a chamber in the base station antenna and that is longitudinally and laterally extending along and across a rear of a base station antenna housing. The base station antenna housing has a passive antenna assembly that cooperates with the active antenna module.

A multi-frequency folded lens antenna structure includes a stack, and the stack includes a polarization-dependent trans-reflector, a dielectric gap, and a multi-frequency twist-reflector; wherein the polarization-dependent trans-reflector is configured to transmit electromagnetic radiation of a first polarization incident from within the stack out of the stack and to reflect electromagnetic radiation of a second, different polarization incident within the stack towards the multi-frequency twist-reflector, and the multi-frequency twist-reflector is configured to selectively change a polarization of the reflected electromagnetic radiation from the second polarization to substantially the first polarization and to direct the electromagnetic radiation of substantially the first polarization, within the stack, towards the polarization-dependent trans-reflector for at least partial transmission out of the stack, wherein the multi-frequency twist-reflector is configured to selectively change the polarization for at least a first frequency band and for at least a second frequency band, non-contiguous to the first frequency band.

Provided is a rapid over-the-air (OTA) production line test platform, including a device under test (DUT), an antenna array and two reflecting plates. The DUT has a beamforming function. The antenna array is arranged opposite to the DUT, and emits beams with beamforming. Two reflecting plates are disposed opposite to each other, and are arranged between the DUT and the antenna array. The beam OTA test of the DUT is carried out by propagation of the beams between the antenna array, the DUT and the two reflecting plates. Accordingly, the test time can be greatly shortened and the cost of test can be effectively reduced. In addition to the above-mentioned rapid OTA production line test platform, platforms for performing the OTA production line test by using horn antenna arrays together with bending waveguides and using a 3D elliptic curve are also provided.

Provided is a rapid over-the-air (OTA) production line test platform, including a device under test (DUT), an antenna array and two reflecting plates. The DUT has a beamforming function. The antenna array is arranged opposite to the DUT, and emits beams with beamforming. Two reflecting plates are disposed opposite to each other, and are arranged between the DUT and the antenna array. The beam OTA test of the DUT is carried out by propagation of the beams between the antenna array, the DUT and the two reflecting plates. Accordingly, the test time can be greatly shortened and the cost of test can be effectively reduced. In addition to the above-mentioned rapid OTA production line test platform, platforms for performing the OTA production line test by using horn antenna arrays together with bending waveguides and using a 3D elliptic curve are also provided.

According to an aspect, there is provided a passive antenna module for an active-passive antenna system. The passive antenna module includes a chassis for detachably mounting onto an active antenna module. The chassis includes an opening or a cavity for extending at least partially over the active antenna module when the chassis is mounted onto the active antenna module. The passive antenna module includes a ground plane layer arranged within or over said opening or cavity and fixed to the chassis. The ground plane layer includes a metallic or metallized grid. The passive antenna module includes a first antenna array including one or more first antenna elements arranged, in part, over said chassis and adjacent to said opening or cavity and, in part, over said opening or cavity. The chassis and the ground plane layer are adapted to act as ground planes for the first antenna array.

Provided herein are various enhanced arrangements for arrays of aperture antennas, such as horn antennas or short backfire antennas. Examples include an array of aperture antennas having a wall thickness between apertures, and a conductive mesh positioned above the apertures such that openings of the conductive mesh are aligned with the apertures and positioned having a selected spacing between the conductive mesh and the apertures.