Ka波段波导-微带探针过渡结构设计

Design of Ka Band Waveguide-to-Microstrip Probe Transition Structure

为满足微波电路中低损耗的应用需求,基于多种基板设计了微带平面法向与波导电磁波传播方向平行的Ka波段波导-微带探针过渡结构,给出了过渡结构的设计方法及相关参数的计算公式,完成了基于三种不同基板的探针过渡结构的建模与仿真优化,并进行了制作、测试和对比分析。该过渡结构具有插入损耗小、回波损耗低、加工简单、易于互连等优点,实测结果表明:在36~40 GHz频段内,0.254 mm厚石英介质探针过渡效果最好,回波损耗优于-15 dB,插入损耗小于0.5 dB。测试结果满足实际需求,具有广泛的实际工程应用价值。

To meet the application requirements of low loss in microwave circuits, Ka band waveguide-to-microstrip probe transition structures with different substrates were designed.The microstrip plane normal direction is parallel with the direction of electromagnetic wave propagation inside the waveguide.The design method of the transition structure and the calculation formula of related parameters were given.The modeling and simulation optimization of the probe transition structures based on three different substrates were completed, and fabrication, testing and comparative analysis were carried out.The transition structure has advantages of low insertion loss and return loss, simple machining and easy interconnection.Measured results demonstrate that from 36 GHz to 40 GHz, the quartz dielectric probe with 0.254 mm thickness has the best transition effect, the return loss is superior to-15 dB,and the insertion loss is less than 0.5 dB.The test results meet the actual requirements and have a wide range of practical engineering application value.