Hexagonal Complimentary Split Ring Resonator Loaded Wideband Substrate Integrated Waveguide Bandpass Filter for S-band

The paper illustrates the design of a Substrate Integrated Waveguide (SIW) using a double-sided FR-4 PCB on which a linear array of Hexagonal Complementary Split Ring Resonators (CSRR) is etched on the ground plane. The SIW filter is designed for S-band. The developed design finds its application in S-band telemetry systems. The filter operates for a wideband that is between 2.9 GHz to 4.5 GHz. The design is carried out with the help of 3D EM tools. A direct solver for Finite Element Method (FEM) has been applied to solve the EM model decreasing the simulation time to develop the proposed design. The simulation results are validated through the obtained experimental results. The measured results depict an insertion loss of less than 3dB and bandwidth in excess of 1.5 GHz required for block data transmission with higher order modulation schemes.