Tunable bandpass filters with constant absolute bandwidth and high linearity

Yu, Feng Lin; Zhang, Yi Bin; Zhang, Xiu Yin; Hu, Bin; Wang, Xian Yi

doi:10.1109/icmmt.2012.6229915

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Cited by 6 publications

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“…Up to now, diverse tunable filters have been proposed [2][3][4][5][6][7][8][9][10]. However, most designs suffer from narrow tuning ranges, un-equal tuning bandwidths, or high insertion loss for narrow passband bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Design of an Active Tunable Bandpass Filter for Spectrum Sensing Application in the TVWS Band

Kim¹,

Kim²,

Yun³

2017

Journal of electromagnetic engineering and science

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In this paper, we propose an active tunable bandpass filter (BPF) for efficient spectrum sensing in the TV White Space (TVWS) band. By designing a narrow bandwidth, it is possible to improve the sensing probability. The basic circuit configuration involves switching the PIN diode compromising capacitor bank to change the capacitance of the LC resonant circuit. To cover the whole TVWS band effectively, we add a varactor diode, and the bandwidth is set to 25-MHz. We improve the insertion loss by using the active capacitance circuit. The tunable BPF in the TVWS band with a 20-MHz interval is designed to have 11 channels with a bandwidth of 25 MHz and a low insertion loss of 1.7-2.0 dB.

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