Journal of electromagnetic engineering and science

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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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)
  • Received : 2012.03.07
  • Accepted : 2012.05.04
  • Published : 2012.06.30
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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.

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References

  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