Design of a bandpass filter using circular cutoff waveguide type dielectric resonators

摘要

A dual TE{sub}111 mode bandpass filter having center frequency 10.76Hz, ripple bandwidth 0.01dB and fractional bandwidth 0.5% is designed by using the electromagnetic simulator Ansoft HFSS. Circular cutoff waveguide type dielectric resonators are used. External Q between a resonator and a coaxixial line and coupling coefficient between two orthogonal TE{sub}111 modes are calculated and dimendions of the filter are determined. The dimendions of the filter are 20mm × 2Omm × 30.5mm. The frequency response of the designed filter is simulated by using the HFSS, and the result is discussed.