800 MHz High Power Bandpass Filter using TM Dual Mode Dielectric Resonators

A novel high power bandpass filter using TM110 dual mode dielectric resonators was developed. TM110 dual mode is achieved with dielectric resonators physically coupled in an asymmetrically orthogonal manner and these arrayed resonators are constructed in monoblock and have high unloaded Q. By assembling these resonators, an 800 MHz high power bandpass filter was realized. Specific features achieved with this new filter are, center frequency of 840 MHz, band width of 40 MHz, and insertion loss of 0.4 dB. Physical size is 80×90×180 mm. Volume is less than 30% of conventional type high power bandpass filter using cavity resonators. This filter is useful as an antenna filter for cellular base stations.