Second-Order Reconfigurable Half-Mode Substrate Integrated Waveguide Dual-Band Filter: a Circuit Perspective

In this work, a tunable dual-band filter has been designed. A triangular Half-Mode Substrate Integrated Waveguide (HM-SIW) resonators have been used to miniaturize the filter to get a smaller device footprint. A dual-band filter operating at 9 GHz and 14 GHz first and second pass-band center frequency is built using Rogers-5880 substrate with a permittivity of 2.2. To reconfigure the center frequencies of the first and second pass-bands, dielectric rods have been used to perturb the structure. The diameter of the dielectric rods are varied from 0.2 mm to 0.8 mm, and the center frequency for the first pass-band changed from 8.1 GHz to 9.15 GHz, while the center frequency of the second pass-band changed from 14.61 GHz to 16.10 GHz. The dielectric rods' permittivity was also changed to alter the structure's overall permittivity and a frequency change from 8.1 GHz to 9.1 GHz, and 14.61 GHz to 14.74 GHz has been observed for the first and second pass-band, respectively.