Tunable SIW-Based Evanescent-Mode Cavity-Backed Slot Antenna With Contactless Tuning
Tunable SIW-Based Evanescent-Mode Cavity-Backed Slot Antenna With Contactless Tuning
复制标题
具有非接触式调谐功能的可调谐基于 SIW 的渐逝模式背腔缝隙天线
DOI：
10.1109/access.2023.3265571
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发表时间：
2023
期刊：
影响因子：
3.9
通讯作者：
H. Sigmarsson
中科院分区：
文献类型：
--
作者：
R. Agasti;Clayton G. Blosser;J. Ruyle;H. Sigmarsson
本文提出了一种频率可重构消逝模背腔缝隙天线（ECBSA），具有宽调谐范围、高功率处理能力和简化的制造。调谐机构由外部长程线性致动器和非接触式调谐器盘组成，用于改变倏逝模式腔的电容负载。通过改变腔体的临界间隙尺寸来调整天线的工作频率。辐射通过空腔接地平面上的环形槽孔发生。该设计使用基板集成波导 (SIW) 技术在印刷电路板 (PCB) 上实现，以便于更轻松地与其他平面电路进行系统集成。当非接触式调谐器垂直移动 $508~\mu \text{m}$ 的距离时，所制造的天线原型在 1.71-2.58 GHz 范围内实现了 40% 的调谐。 ECBSA 的峰值实现增益在 2.58 GHz 的最大工作频率下的测量结果高达 5.48 dB。由于使用外部线性执行器实现了更大范围的腔体临界间隙尺寸，因此功率处理能力高于 ECBSA 设计中通常使用的压电盘调谐器。所提出的天线还表现出文献中提出的高功率机械调谐背腔缝隙天线中最大的调谐范围。
This paper presents a frequency reconfigurable evanescent-mode cavity-backed slot antenna (ECBSA) with a wide tuning range, high-power handling capability, and simplified manufacturing. The tuning mechanism consists of external long-range linear actuators and a contactless tuner disc to vary the capacitive loading of an evanescent-mode cavity. The antenna’s operating frequency is tuned by changing the cavity’s critical gap size. Radiation occurs through an annular slot aperture on the cavity’s ground plane. The design is realized on a printed circuit board (PCB) using substrate-integrated waveguide (SIW) technology to facilitate easier system integration with other planar circuits. The fabricated prototype of the antenna shows 40% tuning from 1.71-2.58 GHz when the contactless tuner is displaced vertically across a distance of $508~\mu \text{m}$ . Measurement results for the peak realized gain of ECBSA is as high as 5.48 dB at the maximum operating frequency of 2.58 GHz. Due to a larger range of the cavity’s critical gap sizes, achieved using external linear actuators, the power handling capability is higher than the typically used piezoelectric disk tuners in ECBSA design. The proposed antenna also exhibits the largest tuning range among the high-power mechanically-tuned cavity-backed slot antennas presented in the literature.