DOI QR코드

DOI QR Code

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

  • Park, Yong-Min (Dept. of Radio Science and Engineering, Chungnam National University) ;
  • Ki, Dong-Wook (Dept. of Radio Science and Engineering, Chungnam National University)
  • 투고 : 2012.03.07
  • 심사 : 2012.05.04
  • 발행 : 2012.06.30

초록

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.

키워드

참고문헌

  1. C. Lijun, Z. Qi, and X. Shanjia, "Delay lines based on left-handed transmission line structure," Proc. Antennas and Propagation Society International Symposium 2006, pp. 1189-1192, 2006.
  2. S. Rummery, G. Branner, "Power amplifier design using feedforward linearization," Proc. the 40th Midwest Symposium on Circuits and Systems, pp. 545- 548, 1997.
  3. H. Visser, Array and Phased Array Antenna Basics, John Wiley & Sons, England, Chapter 7, pp. 212- 219, 2005.
  4. R. Mulagada, T. Weldon, "A delay line discriminator for IFM using a left-handed delay line," Proc. IEEE SoutheastCon 2010, pp. 185-188, 2010.
  5. R. Habel, M. Pelletier, F. Chenier, M. Lecours, and C. Delisle, "Design of a high resolution millimeter wave FM-CW radar," Proc. Canadian Conference on Electrical and Computer-Engineering, pp. 51-54, 1993.
  6. W. Tang, H. Kim, "Compact, tunable large group delay line," Microwave and Optical Technology Letters, vol. 51, no. 12, pp. 2893-2895, Dec. 2009. https://doi.org/10.1002/mop.24747
  7. S. Abielmona, S. Caloz, "Experimental demonstration and characterization of a tunable CRLH delay line system for impulse/continuous wave," IEEE Microwave and Wireless Components Letters, vol. 17, no. 12, pp. 864-866, Dec. 2007. https://doi.org/10.1109/LMWC.2007.910492
  8. S. Park, H. Choi, and Y. Jeong, "Microwave group delay time adjuster using parallel resonator," IEEE Microwave and Wireless Components Letters, vol. 17, no. 2, pp. 109-111, Feb. 2007. https://doi.org/10.1109/LMWC.2006.890331