Ultra-High Isolation Decoupling and Matching Network for mmWave Antennas in Near-Range FMCW Radars

IF 1.1 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

Microwave and Optical Technology Letters Pub Date : 2026-09-30 DOI:10.1002/mop.70795

Zhi Yue Xu, Xinyi Tang, Zhi Ning Chen

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Abstract

A decoupling and matching network (DMN) based on substrate integrated coaxial line technique is proposed to suppress the mutual coupling between a pair of transmitting and receiving antennas operating at 35 GHz. The distorted radiation patterns, typically observed in closely spaced antennas, were improved by introducing carefully designed coupled transformers between antenna feedlines and DMN. The resultant two antennas in the transmitter and receiver produced overlapped patterns to meet radar detection requirements. In this work, a pair of 35 GHz patch antennas with an edge-to-edge gap of mere 0.2 mm was prototyped. The measured 30 dB isolation bandwidth reaches 160 MHz, allowing detection of a target with a weak radar cross section of −14 dBsm at a range of 2 m. The achieved pattern beam shifts by $1 8^{\circ}$ from the boresight, with a beamwidth overlap of $8 7^{\circ}$ .

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近距离FMCW雷达毫米波天线超高隔离解耦匹配网络

为了抑制35ghz发射天线和接收天线之间的互耦，提出了一种基于基片集成同轴线技术的解耦匹配网络（DMN）。通过在天线馈线和DMN之间引入精心设计的耦合变压器，可以改善通常在紧密间隔的天线中观察到的扭曲辐射图。由此产生的发射器和接收器中的两个天线产生重叠的图案，以满足雷达探测要求。在这项工作中，制作了一对35 GHz贴片天线，边缘到边缘的间隙仅为0.2 mm。测量的30 dB隔离带宽达到160 MHz，允许在2 m范围内检测弱雷达横截面为- 14 dBsm的目标。所得到的图案光束从轴视角位移18°$1{8}^{\circ}$，波束宽度重叠为8.7°$8{7}^{\circ}$。

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来源期刊

Microwave and Optical Technology Letters 工程技术-工程：电子与电气

CiteScore

3.40

自引率

20.00%

发文量

371

审稿时长

4.3 months

期刊介绍： Microwave and Optical Technology Letters provides quick publication (3 to 6 month turnaround) of the most recent findings and achievements in high frequency technology, from RF to optical spectrum. The journal publishes original short papers and letters on theoretical, applied, and system results in the following areas. - RF, Microwave, and Millimeter Waves - Antennas and Propagation - Submillimeter-Wave and Infrared Technology - Optical Engineering All papers are subject to peer review before publication