A Novel Filter in Antenna (FiA) With Compact Size and High Performance

天线(收音机) 滤波器(信号处理) 偶极子天线 计算机科学 电磁屏蔽 拓扑(电路) 物理 电气工程 电信 工程类 计算机视觉
作者
Zhenyao Qian,Yue Zhao,Xiyao Liu,Lei Ge,Jun‐Fa Mao
出处
期刊:IEEE Transactions on Antennas and Propagation [IEEE Antennas & Propagation Society]
卷期号:72 (7): 5550-5559
标识
DOI:10.1109/tap.2024.3401477
摘要

In this paper, a novel and effective integrated design method for filtering antennas is proposed for the first time, with the name of Filter in Antenna (FiA). This method takes a holistic perspective, utilizing the antenna structure to build a shielding cavity, and implanting the smaller-sized filter into the larger-sized antenna. To demonstrate the superiority of this method, an FiA prototype is designed by integrating a magneto-electric (ME) dipole and a compact filter. Initially, a metal shielding cavity is built with the M-dipole structure of the low-profile ME dipole. Secondly, a miniaturized filter is built using multi-layer coupling structures. Subsequently, the filter is inserted in the feeding line inside the shielding cavity of the ME dipole. Accordingly, the ME dipole and the multi-layer filter are integrated into an FiA. The design preserves the antenna's size while achieving full filter and antenna functionality integration. As a validation, a fully functional prototype is manufactured and tested. The FiA prototype has compact dimensions of 0.47λ 0 ×0.48λ 0 ×0.076λ 00 is the free-space wavelength at the center frequency), and measured results coincide well with the simulation. Excellent filtering performance (return loss of 21 dB, insertion loss of 0.6 dB, 6 transmission zeros to achieve 15-dB out-of-band suppression bandwidth of 1.6 f 0 , etc.) and nice antenna performance (stable gain of 7.8 dBi, low cross polarization, low back radiation, etc.) are obtained, verifying the feasibility of the proposed method.
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