人工表面等离子体激元(SSPPs)具有低损耗、高束缚、传输效率高的优点,易于平面集成,并被广泛应用于微波滤波器电路设计。文中在具有高通特性的基片集成波导(SIW)上表面刻蚀具有低通特性的SSPPs结构,将二者有机结合设计出一款混合基片集成波导带通滤波器。仿真结果表明,该滤波器在13 GHz~17 GHz的通带内回波损耗均在-11 dB以下,插入损耗在-1. 2 dB左右,在截止频率以外较宽的频带内具有优于-80 dB的优越带外抑制;测试结果和仿真结果高度一致,其回波损耗优于-15 dB,插入损耗在-4 dB左右;通过对平坦和弯曲情况下的滤波器进行对比测试,发现两种状态下的测试高度吻合,证明混合SIW的SSPPs带通滤波器优异的微波特性,并为其在柔性电路的应用提供了研究依据。

Spoof surface plasmon polaritons (SSPPs) has the advantages of low loss, high field confinement, and high transmission efficiency. They are easy to integrate on the plane and are widely used in microwave filter circuit design. In this paper, the SSPPs with low-pass characteristics are etched on the surface of the SIW with high-pass characteristics, and the two are organically combined to design a band-pass filter for a substrate integrated waveguide (SIW). The simulation results show that the return loss of the filter in the pass-band of 13 GHz~17 GHz is below -11 dB, the insertion loss is about -1. 2 dB, and it has a better out-of-band rejection than -80 dB in a wide frequency band outside the cutoff frequency. The test results are highly consistent with the simulation results. The return loss is better than -15 dB and the insertion loss is about -4 dB. By comparing the filters under flat and curved conditions, it is found that the test results in the two states are highly consistent, which proves that the hybrid SIW's SSPPs band-pass filters have excellent microwave characteristics and provides a research basis for applications in flexible circuits.

TN713

陕西省重点研发项目(2020GY-040);陕西省教育厅科研资助项目(18JK0714)