광대역 버틀러 매트릭스와 위상 천이기를 이용한 하이브리드 빔포밍 안테나 시스템 설계

초록

In this paper, a hybrid beamforming antenna system using broadband butler matrix and phase shifter is proposed. In the previous works, an 8×8 butler matrix is used to overcome a drawback of the 4×4 butler matrix based switched beamforming which provides only 4 beam patterns. However the 8×8 butler matrix should be designed on the bi-layered substrate using via holes due to its complex structure. It causes performance degradation. To overcome these problems, the proposed hybrid beamforming antenna system is designed on the single side of the substrate for simple structure. By addition of two phase shifter, it provide various beam patterns. The proposed antenna system provides more than 10 dBi radiation gain in the ±45° scanning range by 16 input combinations.

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