This Letter presents a method for designing a switchable differential filter with high performance using dual-mode dielectric resonator (DR). It consists of a half-cut dual-mode DR, four feeding probes and a printed circuit board which is embedded in the bottom of the metal cavity to enable the integration of the four PIN diodes. In this case, the dual modes of the DR can be differentially excited well by two pairs of feeding probes for constructing the differential passband. By controlling the probe end as open/short status, the differential external quality factor can be adjusted so that the passband is switchable. To validate the proposed idea, a compact switchable differential filter with good performance is designed, fabricated and measured. The simulated and measured results in two states with the good agreement are presented.
This article proposes a novel bandpass filter with two controllable passbands using a single quad‐mode silver‐loaded dielectric resonator (DR). The silver plane is inserted in the middle of the cubic DR and two degenerate pairs are used to build the two passbands. Because of the distinct E‐field distributions, the silver plane has significant effect on the degenerate pair (TEx112 and TEy112), whereas another one (TEx111 and TEy111) remains unchanged. With the aid of the silver plane, both center frequencies and bandwidths of the two bands can be controlled independently. To verify the proposed idea, a prototype dual‐band BPF is designed and fabricated. Good agreement between simulated and measured results can be observed.
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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