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oe1(光电查) - 科学论文

2 条数据
?? 中文（中国） ▾

  • Millimetre-wave low-temperature co-fired ceramic bandpass filter with independently controllable dual passbands

    摘要： This study presents a detailed investigation on the frequency properties of the stub-loaded stepped-impedance resonator (SIR). For the first time, the frequency controllability of the third and fifth harmonic resonant frequencies (f3 and f5) of the SIR under different ratios of impedance and electric length is subjected to a complete theoretical analysis. It can be found that there is a length ratio which makes f3 and the voltage-null point at f3 never be affected by the change of the impedance ratio. Furthermore, the stub loaded at this voltage-null point also has no effect on f3. These features are successfully applicable to realise independent frequency control for dual-band bandpass filters (BPFs). In this situation, a new coupling path through the loaded stub can be constructed only for f5, and the coupling coefficients for the two bands can be individually varied. Accordingly, both the operational frequencies and bandwidths of the two bands can be separately adjusted. For demonstration, an independently controllable dual-band BPF operating at 27.5/33?GHz is designed and fabricated for millimetre-wave wireless applications. Good accordance is achieved between the simulated and measured results.

    关键词： low-temperature co-fired ceramic,independently controllable,bandpass filter,dual passbands,millimetre-wave

    更新于2025-09-23 15:21:21

  • Independently controllable dual-band filter using single quad-mode silver-loaded dielectric resonator

    摘要： 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.

    关键词： dual-band bandpass filter (BPF),dielectric resonator (DR),quad-mode,independently controllable

    更新于2025-09-04 15:30:14