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- W2898364742 abstract "This paper presents a systematic design procedure of microstrip higher order tunable bandpass filters (BPFs) that can realize a constant absolute frequency bandwidth (ABW) and transmission zeros (TZs) with the minimum number of varactors and a single controlled dc-bias voltage. To this end, intrinsic frequency dependence of interresonator couplings is employed instead of external controls, but the design has faced a difficulty of realizing ideal frequency curves of coupling coefficients at all the coupling regions, including nonadjacent couplings. To overcome such a difficulty, this paper introduces a frequency-curve shape design approach considering upward- or downward-curved convex that is dependent on the types of interresonator coupling. As illustrative examples, fourth- and sixth-order tunable BPFs are proposed and designed, starting from a coupling-matrix synthesis. Their structural parameters can be efficiently designed with the proposed design method. The frequency agility with keeping a constant ABW, acceptable low insertion loss, a good in-band return loss level, and TZs is numerically and experimentally demonstrated for both fourth- and sixth-order tunable BPFs." @default.
- W2898364742 created "2018-11-02" @default.
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- W2898364742 date "2019-01-01" @default.
- W2898364742 modified "2023-10-16" @default.
- W2898364742 title "Coupling-Matrix-Based Systematic Design of Single-DC-Bias-Controlled Microstrip Higher Order Tunable Bandpass Filters With Constant Absolute Bandwidth and Transmission Zeros" @default.
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- W2898364742 doi "https://doi.org/10.1109/tmtt.2018.2873366" @default.
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