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Design and Implementation of a Frequency Tunable Bandpass Filter for TVWS  

Kang, Sanggee (군산대학교 정보통신공학과 무선기술연구실)
Publication Information
Journal of Satellite, Information and Communications / v.11, no.4, 2016 , pp. 44-47 More about this Journal
Abstract
In these days, interest of systems and services using TVWS(TV White Space) are increased, communication systems and services for TVWS have been actively studied. The unoccupied frequency in TVWS is different according to the geographical location and the time of day. RF systems having a frequency tunable bandpass filter operated in TVWS could be efficiently used. In this paper, a frequency tunable bandpass filter operated in 470 ~ 698MHz is designed and implemented. In consideration of simple control and physical size, the tunable bandpass filter is designed with 2-pole. The implemented tunable bandpass filter has the operating frequency band of 470 ~ 698MHz with control voltages of 1.58 ~ 3.93V, the insertion loss of maximum 4.78dB and the return loss of below 10dB. The implemented frequency tunable bandpass filter can be directly used in the RF receiver for TVWS and the design procedures could be used for developing a high power tunable bandpass filter as the basic research data.
Keywords
Tunable Filter; BPF(Band-Pass Filter); Varactor; LC BPF; Digital Control;
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