Dielectric Resonator Band Pass Filters for Microwave Communication Systems

New bandpass filters (BPF) using dielectric resonators (DR) were developed, incorporating new circuit technology to improve notably the spurious response, whose existence had been looked upon as a bottleneck in designing the DR BPFs. The newly developed DR BPFs have been used in NEC microwave radio equipment for overseas and domestic applications for their outstanding features-reduction in the insertion loss, compactness, low cost, etc.