Microwave Dielectric Resonator Filters Utilizing Ba/sub 2/Ti/sub 9/O/sub 20/ Ceramics

Dielectric resonators utilizing Ba/sub 2/Ti/sub 9/O/sub 20/ ceramic yield high Q's (Q = 8000-10000) along with excellent temperature stability (T/sub f/ = 0-2 ppm//spl deg/C) at 4 GHz. Integrable bandpass and bandreject filters having low losses and excellent temperature stability are obtained in structures containing Ba/sub 2/Ti/sub 9/O/sub 20/ resonators coupled to either stripline or waveguide.