A scanning beam antenna fed by a 7 x 8 Butler matrix for 5G applications

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING(2022)

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摘要
A 7 x 8 Butler matrix (BM) beam-forming network operating at Ka-band is proposed to feed a 8 x 8 slot array. By merging the two central input ports of the BM into one port, the BM can provide output signals with equal phase, thereby generating a boresight beam. Measured results show that the proposed antenna has impedance bandwidth of 29.5-30.5 GHz, while the gain lies in the range of 14.7-21.8 dBi. Seven beams are realized, including a boresight beam, covering the range from -58 degrees to 58 degrees. In order to verify this concept, the feeding network and antenna are designed and manufactured. The measured results are in good agreement with simulation. It is a capable candidate for 5G mobile terminal applications.
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关键词
Butler matrix, scanning beam antenna, substrate integrated waveguide, the fifth-generation mobile network
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