Tunable Composite Right/Left-Handed Delay Line with Large Group Delay for an FMCW Radar Transmitter

被引:0
|
作者
Park, Yong-Min [1 ]
Kim, Dong-Wook [1 ]
机构
[1] Chungnam Natl Univ, Dept Radio Sci & Engn, Daejeon, South Korea
关键词
Tunable Delay Line; Varactor Diode; Large Group Delay;
D O I
10.5515/JKIEES.2012.12.2.166
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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.
引用
收藏
页码:166 / 170
页数:5
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