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A planar vertically-integrated tunable filter/antenna with constant absolute bandwidth
2017 IEEE MTT-S International Microwave Symposium (IMS), 2017This paper presents a vertically-integrated second-order tunable planar filter/antenna that expands upon previous work with tunable filter/antennas. This work demonstrates the use of a radiating element as a resonator in the filter and uses mixed electric and magnetic coupling to achieve a constant absolute bandwidth over the filter tuning range ...
Lovato, Ricardo, Gong, Xun
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Varactor-tuned superconducting filter with constant absolute bandwidth at VHF-band
Physica C: Superconductivity and its Applications, 2015Abstract A four-pole superconducting tunable filter at VHF-band with constant absolute bandwidth is proposed. The resonator consists of a spiral-in-spiral-out (SISO) resonator with one end shorted to ground and the other end loaded with a varactor diode.
Bo Li +6 more
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Compact Reconfigurable Dual-Band Bandpass Filter with Constant Absolute Bandwidth
2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT), 2018A compact dual-band bandpass filter (BPF) based on stepped impedance resonator (SIR) and defected-feeding structure is investigated in this paper. The SIR with T-stub centrally loaded provides more degrees of freedom to adjust the dual-band resonant frequencies.
Zhang. Li, Liang. Bo
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Constant absolute bandwidth UHF tunable filter using RF MEMS
2012 42nd European Microwave Conference, 2012This paper presents the design and the performances of a tunable UHF filter that uses MEMS capacitors arrays. Central frequency of the filter varies from 278 to 385 MHz and can be adjusted by actuating a desired number of MEMS. Thanks to a specific topology and well-chosen input and output tank circuits, the absolute bandwidth varies from 13 to 14 MHz ...
G. Nicolini +7 more
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VHF Discrete-Tuned Filters With Constant Insertion Loss and Absolute Bandwidth
2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT), 2019These instructions give you basic guidelines for preparing papers for conference proceedings. This letter presents a novel two-pole tunable bandpass filter with constant insertion loss and absolute bandwidth designed for 30-90 MHz operation. The centre frequency and inter-stage coupling are synchronously discrete-tuned by connecting PIN switched ...
Zhi-Yuan Zhao, Guo-qin Kang
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A Fourth Order Constant Absolute Bandwidth Tunable Bandpass Filter with Cross-Coupling
2019 IEEE MTT-S International Wireless Symposium (IWS), 2019A cross-coupled tunable filter with constant absolute bandwidth (CABW) is proposed in this paper. Coupling matrix is used to calculate the coupling coefficient of the tunable filter. Varactor-loaded resonator with separate electric dominant and magnetic dominant coupling region is employed to realize the cross-coupled topology.
Sheng Wang, Qianyin Xiang, Quanyuan Feng
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Design of a six-pole tunable band-pass filter with constant absolute bandwidth
2016 Progress in Electromagnetic Research Symposium (PIERS), 2016This paper presents the design and implementation of a tunable bandpass filter with constant absolute bandwidth. Two types of coupled microstrip lines in the anti-parallel and pro-parallel formats with varactor-loaded ⋋/2 resonators are investigated to demonstrate its advanced capacity in control of the bandwidth variation. In this design, two adjacent
Xiao-Guo Huang +3 more
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A Reconfigurable Fourth-order Filter With Constant Absolute Bandwidth And Four Transmission Zeros
2019 IEEE Asia-Pacific Microwave Conference (APMC), 2019In this letter, a reconfigurable fourth-order bandpass filter with constant absolute bandwidth (ABW) and four transmission zeros is presented. The proposed filter is composed of a pair of varactor-loaded half-wavelength resonators and a pair of quarter-wavelength resonators with varactors loading at specific position.
Maoyu Fan, Kaijun Song, Yu Zhu, Yong Fan
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A tunable bandpass filter with constant absolute bandwidth based on one ring resonator
Journal of Electromagnetic Waves and Applications, 2012A miniaturized tunable bandpass filter (BPF) with constant absolute bandwidth (ABW) based on a single ring resonator is presented in this paper. The proposed BPF is composed of one ring resonator and a pair of resonators loaded with varactors. The working frequency of the BPF depends on the pair of resonators.
Y.-Y. Wang +4 more
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Design of tunable bandpass filter using PIN diode with constant absolute bandwidth
2013 Asia-Pacific Microwave Conference Proceedings (APMC), 2013This paper presents a tunable bandpass filter (BPF) for cognitive radio applications. The proposed two-pole BPF is implemented using lumped elements and the frequency tuning is realized by PIN diodes. Due to the L-C parallel circuit J-inverter, constant absolute bandwidth is achieved.
Jong-Hyun Lee +3 more
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