Experimental Study of Metasurface Inclusion on A Bandpass Filter Developed Based on Substrate Integrated Waveguide

This paper discusses an experimental study on the effect of metasurface inclusion to the characteristics of a bandpass filter (BPF) developed based on substrate integrate waveguide (SIW). The metasurface is constructed by combining 14 complimentary split ring resonators (CSRRs) and 7 thin wires, whilst the SIW BPF is designed on two layers of 0.4 mm thick Roger RO4003C dielectric substrate with the dielectric constant of 3.38. The simulation result shows that the inclusion of metasurface into SIW BPF can enhance the filter performances indicated by the improvement of reflection coefficient (S
11
) and transmission coefficient (S
21
) values. Meanwhile, the experimental measurement demonstrates that the SIW BPF with metasurface inclusion has the S
11
value of –57.8 dB and S21 of –6.2 dB at the center frequency of 3.28 GHz. Here, the low S
21
value is contributed by the losses of materials used to develop the SIW BPF with metasurface inclusion.