Siw Diplexer Loaded With Complementary Stepped Impedance S-Shaped Resonators

Abstract

Abstract-In this letter, we present a diplexer implemented on a substrate integrated waveguide (SIW) with stepped impedance complementary S-shaped resonators (CSSRs). The variable frequency response of the stepped impedance concept adjoining SIW technology leads to improved device performance in terms of matching and isolation. Simulated and measured results show input matching, |S 11 |, better than −15 dB and output isolation, |S 32 |, below −30 dB for the frequency range 1-4 GHz. Furthermore, CSSRs offer a degree of freedom to design fundamental and higher order frequencies by selectively tuning the geometrical parameters. This simple yet effective approach eliminates the complexity to design diplexers based on complementary split ring resonator (CSRRs).

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“…The diplexer designed in Reference offered advantages in terms of compact size, low loss, and high isolation based on CSRRs and SIW technology. Following the similar approach, a diplexer was designed on a SIW with stepped impedance complementary S‐shaped resonators (CSSRs) . The variable frequency response characteristics of stepped impedance resonators in this work led to a higher output isolation (>30 dB).…”

“…(A) CSRR based diplexer proposed in Reference , (B) CSRR topology, (C) Stepped impedance CSRR topology as proposed in Reference …”