【时间】2023年5月25日（周四）15：30 开始

【地点】9B406会议室

【主题】面向全球导航定位系统应用的宽频宽轴比波束缝隙螺旋天线研究

【主讲人简介】

钟增培，东莞理工学院讲师，2021年12月毕业于深圳大学电子与信息工程学院，获工学博士学位。钟博士的研究方向主要包括天线与微波电路、全球卫星导航定位系统。近年来，他一直致力于高性能、小型化的导航圆极化天线研究，围绕双频/宽频、宽轴比波宽、增强前后比、小型化设计做了许多相关工作，发表学术论文21篇，其中以第一作者/通讯作者发表期刊和会议论文11篇。

【内容简介】

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.

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