Wideband Substrate-Integrated-Waveguide BPF Incorporated with Camplimentary-Split-Ring-Resonators

This paper discusses the development and characterization of wideband substrate-integrated-waveguide (SIW) bandpass filter (BPF) incorporated with two reversely arranged complimentary-split-ring-resonators (CSRRs). The proposed filter is intended to have bandwidth response more than 8 GHz suitable for applications in wireless communication systems. The incorporation of CSRRs on the SIW surface allows the extension of passband area at the higher frequency region yielding the wideband response of filter. A 1.6 mm thick FR4 epoxy dielectric substrate with the dimension of 40 mm × 45 mm is applied for filter implementation. The characterization result shows that the proposed filter has the fractional bandwidth of around 135% at the center frequency of 6.74 GHz. This result was achieved through measurement setup to demonstrate a good agreement between the simulation and experimentation.