Abstract
A novel differential bandpass filter (BPF) based on a TE01δ -mode dielectric resonator (DR) is proposed. By utilising the inherent electromagnetic properties of the TE01δ -mode ring-shaped DR, the TE01δ mode, as a dominate mode of the DR, can be differentially excited for constructing the fundamental differential passband of the BPF. To validate the proposed idea, a second-order differential BPF is designed, fabricated and measured. Good agreement is obtained between simulated and measured results, showcasing good performance such as low insertion loss and high common-mode suppression in the differential passband.
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