Improvement of the stopband spurious window for a dual-mode dielectric resonator filter by new coupling technique

Abstract

This paper presents a new design technique for two configurations of a dual-mode filter using a dielectric loaded cavity operating at 1.95 GHz. The dielectric puck in the proposed filter was floated in the middle of a cylindrical metal cavity with short circuits on the side walls and holes through the ceramic from the side face. These holes allowed the insertion of coupling probes which did not affect the unloaded quality factor or the spurious window. The inline structure 4 th pole Chebyshev dual mode filter offers a 870 MHz suppression window while the planar configuration was 710 MHz from the resonance frequency and the operation bandwidth of 54 MHz. The volume reduction ratio was eight times larger compared with a coaxial filter of the same Q factor.

Compact triple-mode microwave dielectric resonator filters

“…Microwave filters are essential components enabling efficient use of the scarce RF spectrum . Dielectric resonators have been widely used in cellular base stations to design high performance and compact size filters and diplexers (Luhaib et al, 2018). However, the size of dielectric resonator filters are still large.…”