800 MHz band high-power bandpass filter using TM/sub 110/ mode dielectric resonators for cellular base stations

An 800-MHz-band high-power filter using TM/sub 110/-mode dielectric resonators with a 25-MHz bandwidth is described. This elliptic function, six-pole filter has low dissipation characteristics and excellent temperature stability. Under high-power operation, the changes of the filter characteristics are negligible. The size of the filter is 200*140*60 mm (1700 cm/sup 3/), about one-fifth the volume of conventional high-power filters. >