A triple-mode ring dielectric resonator band-pass filter using substrate integrated waveguide (SIW)

This paper presents a design of triple mode ring dielectric resonator band-pass filter. The first mode TM₀₁₀ and the second degenerated modes TM₁₁₀ were excited. Instead of using conventional metal enclosures, substrate integrated waveguide (SIW) was used for easily integrating with other microwave circuits. Analytic equations were derived to determine the resonant frequencies and the quality factor of the ring dielectric resonator filter. It has been found that the calculated results agreed with simulated ones by using EM software. To develop a triple mode ring dielectric resonator filter, novel input and output structures were realized. The measured insertion of the filter is about 0.6dB with 3-dB fractional bandwidth of 9.8% obtained at operating frequency 2.1GHz. This proposed filter configuration effectively reduced the cost of assembly and the difficulty of integration associated with other circuits. The concept is very attractive for using in low cost, low insertion loss and high Q production of wireless filter application.