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2011825 · This letter presents an RF microelectromechanical systems (MEMS) tunable bandpass filter with a tuning range of 30%. An analytical process of designing a bandpass filter is also presented by using MEMS switch, series gap, and etched structure in coplanar waveguide (CPW). The designed structure of the MEMS switch and CPW is …
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This paper proposes a novel mechanically tunable waveguide filter design, based on a coupled resonator topology. The resonator geometry consists of a rectangular waveguide cavity and a dielectric cylinder. Unlike conventional cylindrical resonators which are made out of a single part, here the cylinders are cut in half. By changing the distance between …
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A Tunable Bandpass Filter. The –3dB bandwidth of a second order filter is equal to the center frequency (f CENTER) divided by the Q value (bandwidth = f CENTER /Q). The sensitivity of the second order bandpass filter to the tolerance of the integrator’s RC values is proportional to the filter’s Q. Typically with a Q ≤ 4, using a ±1% R ...
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An overview of the electronically tunable RF and microwave bandpass filters using small-size resonators is presented. Design approaches, advances, trends, and challenges are discussed. A special emphasis is made on the design issues which are not always taking into account but can have a significant impact on tunable filter characteristics.
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202365 · In this paper, a compact high-selectivity frequency tunable bandpass filter (BPF) with constant absolute bandwidth (ABW) based on varactor-loaded step-impedance resonators (SIRs) is presented. By introducing cross coupling between resonators, a pair of transmission zeros (TZs) close to the passband are produced and the selectivity of the …
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202437 · In this paper, a fully tunable bandpass filter (BPF) with three states of filtering (single passband state, dual passband state and all-off state) is proposed, the proposed fully tunable BPF is cascaded by a tunable low pass filter section (LP) and a tunable high pass filter section(HP). By introducing a switchable dual-mode notch in the …
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2002215 · These filters were first described in an article I wrote for the National Con- test Journal.2 Filter Design and Construction The filter design I chose is a three-section Butterworth band-pass filter (See Fig 1). I chose this design to minimize insertion loss, produce a flat response across each band and maintain a 50-Q impedance.
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201491 · A tunable helical bandpass filter with high selectivity designed for 30–88 MHz operation is presented. The two-pole tunable filter is discretely tuned by connecting PIN switched capacitor banks at the terminal ends of the helix.
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202369 · This paper describes a method for designing tunable coaxial bandpass filters based on an inserted coaxial stepped impedance resonator (SIR). The miniaturization of the coaxial resonator is realized by the shape of the stepped impedance structure. In addition, an extended tuning range can be achieved by utilizing the SIR. A third-order …
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The filter achieves 3.1-10.6 GHz UWB bandpass characteristics through an improved multi-mode resonator. An L-shape λ/2 notch resonator loaded with a 2-bit reconfigurable interdigital capacitor (IDC) array is coupled to the multiple-mode resonator and generates a tunable notch band to reject any undesired signal that may interfere with the UWB ...
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