【時間】2023年5月25日（周四）15：30 開始

【地點】9B406會議室

【主題】面向全球導航定位系統應用的寬頻寬軸比波束縫隙螺旋天線研究

【主講人簡介】

鐘增培，東莞理工學院講師，2021年12月畢業于深圳大學電子與信息工程學院，獲工學博士學位。鐘博士的研究方向主要包括天線與微波電路、全球衛星導航定位系統。近年來，他一直緻力于高性能、小型化的導航圓極化天線研究，圍繞雙頻/寬頻、寬軸比波寬、增強前後比、小型化設計做了許多相關工作，發表學術論文21篇，其中以第一作者/通訊作者發表期刊和會議論文11篇。

【内容簡介】

A travelling-wave-fed slot spiral antenna with wide axial-ratio (AR) bandwidth and beamwidth for GNSS applications is proposed. The evolution procedure of the proposed antenna can be classified into three steps. Firstly, 12 identical spiral slots are arranged concentrically in a compact area, and AR roundness in low elevation plane is improved by virtue of good rotational symmetry of slot radiators. Secondly, a two-turn travelling-wave feed line is sequentially coupled to the slots, and wideband response of desired magnitude ratio and phase difference of Eθ and Eϕ is obtained by optimizing the number and growth rate of microstrip turns. Thirdly, by supporting the antenna with a modified metallic cavity, the CP radiation performance in low elevation plane is well improved, and thus a widened AR beamwidth is obtained. Finally, the proposed antenna with satisfactory performance is realized in a diameter of 0.56λ0 and height of 0.12λ0, where λ0 is the free-space wavelength at center frequency 1.4 GHz. Measured bandwidth of |S11| fully covers the entire GNSS bands, and the 3-dB AR bandwidth ranges from 1.14 to 1.67 GHz (37.7%). Moreover, the 3-dB AR beamwidth exceeds 140° at 1.4 GHz.

誠摯歡迎廣大師生參加。