Abstract
A novel 3.5/38 GHz dual-band shared-aperture antenna is proposed in this paper. Miniaturization technology of the patch antenna is introduced into the shared-aperture antenna for the first time to reduce the occupied area. Meanwhile, high aperture reuse ratio and high channel isolation are achieved to support the sub-6G and the millimeter-wave antennas to operate simultaneously. The proposed antenna has a miniaturized patch antenna operating in 3.5 GHz and a 4 × 8 substrate integrated waveguide (SIW) cavity-backed slot array operating in 38 GHz. By using the miniaturization technology, the patch antenna for 3.5 GHz reduces their occupied area by half. Moreover, after employing the structure reuse technology, the whole SIW cavity-backed slot array is employed as the patch antenna to share the same aperture to further reduce the occupied aperture size by half compared with the non-shared-aperture one With the miniaturization technology and shared-aperture technology, the whole aperture size has been reduced by 75% consequently. In addition, the feeding structure of the 38 GHz antenna is employed as a part of the 3.5 GHz radiator, which increases the aperture reused rate greater than non-shared-aperture one and also reduce the mutual interference. Finally, the SIW cavity-backed slot antenna has high-pass self-filtering characteristic to filter the sub-6G signals to improve the isolation. The simulation results show that the isolation up to 70 dB in 3.5 GHz and 40 dB in 38 GHz is achieved.
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