Journal
JOURNAL OF ELECTROMAGNETIC ENGINEERING AND SCIENCE
Volume 17, Issue 1, Pages 34-38Publisher
KOREAN INST ELECTROMAGNETIC ENGINEERING & SCIENCE
DOI: 10.5515/JKIEES.2017.17.1.34
Keywords
Active Filter; Negative Resistance; Tunable Bandpass Filter (BPF); TV White Space
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Funding
- Ministry of Science, ICT & Future Planning (MSIP), Korea, in the ICT RD Program [B0101-14-0171]
- Korea Evaluation Institute of Industrial Technology (KEIT) [B0101-14-0171] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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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