A Band-Pass Filter Based on Half-Mode Substrate Integrated Waveguide and Spoof Surface Plasmon Polaritons

Lei Zhao,Xiaopeng Shen,Yuan Li,Xin-Hua Liang,Zhao-Min Chen,Qingfeng Zhang,Jun Wang

doi:10.1038/s41598-019-50056-9

Abstract

In this paper, a band-pass filter based on half-mode substrate integrated waveguide (HMSIW) and double-layer spoof surface plasmon polaritons (SSPPs) consisting of two corrugated metal strips is proposed, which can realize band-pass transmission by etching periodic grooves at the top and bottom metal layers of the HMSIW. Moreover, the influences of important parameters on the performance of the proposed band-pass filter are analyzed by parametric study. By changing the key parameters, the low and high cut-off frequency can be controlled independently. The corresponding equivalent circuit of the proposed band-pass filter is put forward to explain the physical mechanism. Compared with the previous structures, this structure features smaller size, wider bandwidth and lower loss. Simulated results show that the proposed band-pass filter achieves a bandwidth (for |S11| < −10 dB and |S21| > −0.8 dB) of about 69.77% (15.6–32.1 GHz). The measured results have good agreements with the simulated ones, which verify that the proposed band-pass filter has good performances and potential applications at the microwave frequencies.

Highlights

Have widely applied in the microwave frequencies[22,23]
A hybrid SIW-SPP transmission structure was proposed[27], where SPPs propagate through arrays of transverse metallic blind holes that were designed inside the SIW
A hybrid half-mode substrate integrated waveguide (HMSIW)-spoof surface plasmon polaritons (SSPPs) filter was proposed[28], which overcomes the shortcomings of large size

Summary

Introduction

Have widely applied in the microwave frequencies[22,23]. An ultrathin metallic structure printed on a dielectric substrate was proposed[24] to achieve a broadband band-pass filter with a low loss in the microwave frequency band. An ultrathin metallic structure printed on a dielectric substrate was proposed[24] to achieve a broadband band-pass filter with a low loss in the microwave frequency band.

Results

Conclusion