Design of Band-Pass Filter Using Gap Waveguide Technology

A narrow band microwave filter design based on recently proposed low loss, fabrication friendly gap waveguide technology is presented in this work. A 3 order filter with typical chebyshev response and 1% fractional bandwidth is designed at 42 GHz. The filter design involves also the design of the ridge gap waveguide resonator without metal side walls. The confinement of the electromagnetic field within the resonators and the filter structure is obtained by using a periodic square pin structure which stops the propagation of wave. Good filter response is obtained in the full wave simulation. Apart from this waveguide filter, a conventional microstrip bandpass filter is also shielded with newly proposed pin lid packaging solution based on gap waveguide technology. The performance improvement of the microstrip filter is also shown in this work.

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