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J Electromagn Eng Sci > Volume 16(3); 2016 > Article
Journal of Electromagnetic Engineering and Science 2016;16(3):164-168.
DOI: https://doi.org/10.5515/JKIEES.2016.16.3.164   
A Dual-Band Through-the-Wall Imaging Radar Receiver Using a Reconfigurable High-Pass Filter
Duksoo Kim, Byungjoon Kim, Sangwook Nam
School of Electrical Engineering and Computer Science, Institute of New Media and Communications, Seoul National University
Correspondence:  Duksoo Kim,Email: dskim@ael.snu.ac.kr
Abstract
A dual-band through-the-wall imaging radar receiver for a frequency-modulated continuous-wave radar system was designed and fabricated. The operating frequency bands of the receiver are S-band (2-4 GHz) and X-band (8-12 GHz). If the target is behind a wall, wall-reflected waves are rejected by a reconfigurable $G_m-C$ high-pass filter. The filter is designed using a high-order admittance synthesis method, and consists of transconductor circuits and capacitors. The cutoff frequency of the filter can be tuned by changing the reference current. The receiver system is fabricated on a printed circuit board using commercial devices. Measurements show 44.3 dB gain and 3.7 dB noise figure for the S-band input, and 58 dB gain and 3.02 dB noise figure for the X-band input. The cutoff frequency of the filter can be tuned from 0.7 MHz to 2.4 MHz.
Key words: Dual-Band Receiver, FMCW Radar System, $G_m-C$ Filter, Reconfigurable High-Pass Filter, Through-the-Wall Radar
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