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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Wideband varactor-tuned balanced bandpass filter with stable passband selectivity
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Wideband varactor-tuned balanced bandpass filter with stable passband selectivity

机译：具有稳定通带选择性的宽带变容二极管调谐平衡带通滤波器

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摘要

This article presents a wideband tunable balanced bandpass filter (BPF) with stablepassband selectivity using optimized varactor-loaded half-guided wavelength steppedimpedance resonator (SIR). By overall investigation, it can be found that thefrequency-tuning range of the varactor-loaded SIR is not only controlled by the variationrange of the loaded capacitor, but it can be widened by optimizing the SIR. Thecoupling region between the two coupled SIRs in the proposed BPF is studied forachieving the constant absolute bandwidth (ABW) during the frequency-tuning process.Meanwhile, the frequency-dependent source-to-load coupling is introduced torealize two self-adaptive transmission zeros (TZs) on both sides of the tunabledifferential-mode (DM) passband so that the proposed filter can keep high selectivity.Benefiting from the constant ABW and two self-adaptive TZs, the stable DM passbandselectivity of the balanced tunable filter can be obtained. For demonstration, abalanced tunable BPF based on the optimized varactor-loaded SIRs is designed, fabricatedand measured. The simulated and measured results, showing good agreement,exhibit a tuning range from 0.542 GHz to 0.926 GHz with 3-dB constant ABW ofaround 105 MHz and in-band insertion loss of 1.5-2.56 dB.
机译：本文介绍了一种宽带可调谐平衡带通滤波器（BPF），该宽带滤波器使用优化的变容二极管加载的半导波波长步进 r n阻抗谐振器（SIR），具有稳定的 r n通带选择性。通过整体研究可以发现，变容二极管负载的SIR的频率调谐范围不仅受负载电容器的变化范围的控制，而且可以通过优化SIR来扩大。研究了拟议的BPF中两个耦合SIR之间的耦合区域，以便在频率调谐过程中获得恒定的绝对带宽（ABW）。 r n同时，频率相关的源到负载引入耦合以在可调 r n差分模式（DM）通带的两侧实现两个自适应传输零（TZ），从而使所提出的滤波器可以保持高选择性。 r n受益于常数通过ABW和两个自适应TZ，可以获得平衡可调滤波器的稳定DM通带 r n选择性。为了演示，设计，制造并测量了基于优化的变容二极管负载SIR的平衡可调BPF。仿真和测量结果显示出良好的一致性， r n设置了从0.542 GHz到0.926 GHz的调谐范围，其中3-dB恒定ABW为 r n在105 MHz附近，带​​内插入损耗为1.5-2.56 dB。

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