Abstract
This letter presents a novel miniaturized differential dual-band bandpass filter (BPF) using a single quad-mode metal-loaded dielectric resonator (DR). The differential dual-band BPF is designed in a single-cavity configuration with one quad-mode DR and four feeding probes, featuring compact size. The rectangular DR is directly mounted on the bottom of the metal cavity and covered by a metal plate on the top surface. It allows two pairs of orthogonal modes (LSE10 and LSM10), which can be differentially excited and coupled by introducing proper perturbation for constructing dual-band differential-mode frequency response. To validate the proposed idea, a compact differential BPF with good performance using a quad-mode DR cavity is designed, fabricated, and measured. The simulated and measured results with good agreement are presented.
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