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J. Electromagn. Eng. Sci > Volume 12(2); 2012 > Article
Journal of Electromagnetic Engineering and Science 2012;12(2):166-170.
DOI: https://doi.org/10.5515/JKIEES.2012.12.2.166   
Tunable Composite Right/Left-Handed Delay Line with Large Group Delay for an FMCW Radar Transmitter
Yong-Min Park, Dong-Wook Ki
Dept. of Radio Science and Engineering, Chungnam National University
Abstract
This paper presents a tunable composite right/left-handed (CRLH) delay line for a delay line discriminator that linearizes modulated frequency sweep in a frequency modulated continuous wave (FMCW) radar transmitter. The tunable delay line consists of 8 cascaded unit cells with series varactor diodes and shunt inductors. The reverse bias voltage of the varactor diode controlled the group delay through its junction capacitance. The measured results demonstrate a group delay of 8.12 ns and an insertion loss of 4.5 dB at 250 MHz, while a control voltage can be used to adjust the group delay by approximately 15 ns. A group delay per unit cell of approximately 1 ns was obtained, which is very large when compared with previously published results. This group delay can be used effectively in FMCW radar transmitters.
Key words: Tunable Delay Line, Varactor Diode, Large Group Delay
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