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Bandwidth enhancement of a half-mode substrate integrated waveguide filtering power divider using spoof surface plasmon polariton

This paper presents a C-band filtering power divider (FPD) based on a hybrid of spoof surface plasmon polariton (SSPP) and half-mode substrate integrated waveguide (HMSIW). The proposed hybrid circuit is designed by etching subwavelength corrugated grooves in the HMSIW upper wall and has both characteristics of the SSPP and HMSIW structures. It can create the bandpass response and reduce both transverse and longitudinal dimensions of the substrate integrated waveguide structure by nearly 50%. The dispersion and transmission characteristics of the proposed HMSIW-SSPP transmission line are analyzed. The lower and upper edges of the passband can be adjusted independently by tuning the dimensions of the HMSIW and SSPP structures. The presented FPD is fabricated and measured to validate the proposed design procedure. The simulated and measured results are in good agreement. The measured results show that the proposed circuit achieves a bandwidth of 66% from 4 to 8 GHz with better than 10.5 dB return loss and a minimum insertion loss of 1.05 dB.