2GHz band quadruple mode dielectric resonator filter for cellular base station

This paper describes a novel 2GHz bandpass filter using a novel quadruple mode dielectric resonator for compact cellular base station. We propose small high Q dielectric resonator technique using TM/sub 11//spl delta/-x, TM/sub 11//spl delta/-y, TE/sub 01//spl delta/-x and TE/sub 01//spl delta/-y modes. It has very high unloaded Q factor value of about 15000 at 2GHz band. We have designed and manufactured a 4-pole band filter using this resonator. Insertion loss is very low of less than 0.23 dB and high attenuation of 90dB. Outer dimensions are 48 /spl times/ 48 /spl times/ 42 mm.