Miniaturized conductor-backed CPW high-pass filter for C-band satellite applications

A miniaturized conductor-backed coplanar waveguide high-pass filter for C-band satellite applications is presented in this article. It consists of high impedance line and hexagonal resonator with interdigital coupling implemented in coplanar by etching square ring metallic pattern at the ground plane of the substrate. The necessary transmission zero is obtained by the shunt connected square ring pattern. The hexagonal resonator arrangement is used to produce band pass characteristics and the back side strip introduces capacitance effect thereby improving the rejection level. Hence, the filter behaves as high-pass filter. Design, simulation, and fabrication of Satellite C-band high-pass filter characteristics are investigated. The proposed filter yields excellent band width starts from 2 to 8 GHz at 10 dB. Hence, the proposed filter will be best suitable for Satellite C-band applications. The overall size of filter is achieved to be 39 mm x 8 mm x 1.6 mm on accounting all the features. The fractional band width of the filter is calculated from bandwidth to center frequency ratio and it is found 120%. S-parameter results of high-pass filter are return loss (RL) S-11 is about -30 dB and insertion loss (IL) S-21 is -0.98 dB are obtained in simulation. Whereas in the measurement, the RL is nearly -25 dB and IL is -2 dB.