Browse > Article

Design of Image Rejection SSB Modulator for X-Band Monopulse RADAR using Waveguide Hybrid Coupler  

Koh, Young-Mok (Kwangwoon University)
Ra, Keuk-Hwan (Kwangwoon University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.48, no.6, 2011 , pp. 34-40 More about this Journal
Abstract
From the present paper researched about the Design of Image Rejection SSB Modulator for X-Band Monopulse RADAR using Waveguide Hybrid Coupler. Generally, SSB modulator mixes IF(RF) and LO signals, and then it converts to RF(IF) frequency band. In this case, in order to transmit one sideband from RF band, SSB modulator is demanded the removal of image and LO signal. The balanced mixer was designed using waveguide hybrid coupler and crystal mixer diode to mix LO and IF signal. And also the IF Amplifier was designed for IF(+) and IF(-) signal generation which have $90^{\circ}$ phase differences which are suitable in two crystal mixer diode inputs. In order to maintain a high electric reliability from high frequency band the waveguide and IF amplifier's case were manufactured with aluminum using deep brazing techniques. The test result of SSB modulator, LO and sideband signal rejection ratio were 14.2dB and 18.5dB respectively.
Keywords
Single Side Band Mixer; SSB; Balanced Mixer; Image Rejection Mixer; Monopulse Radar;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Stephen A. Maas, Microwave Mixers 2nd Ed., Artech House, pp. 237-312, 1993.
2 Messenger, G. C, Mccoy, C. T., "Theory and Operation of Crystal Diodes as Mixers", Proc. of IRE, pp. 1269-1283, 1957.
3 A. Lindell, B.Sc, and T. Oxley, "Radar crystal valves", The Institution of Electrical Engineers, No. 3104E, pp. 426-433, Jan. 1960.
4 Merrill Skolnkik, Introduction to RADAR Systems 3rd Ed., McGraw-Hill, pp. 210-238, 2001.
5 Guy Morris, Linda Harkness, Airborne Pulsed Doppler RADAR 2nd Ed., Artech House, pp. 289-322, 1996.
6 George C. Reeder, Jr., Monopulse Radar Antenna Structure, US3711858, Jan. 16, 1973.
7 Bassem R. Mahafza, Radar Systems Analysis and Design Using MATLAB 2nd Ed., Chapman & Hall/CRC, pp.465-525, 2005.
8 Donald E. Norgaard, "The phase-shift method of single-sideband signal generation", Proc. of IRE, vol. 44, No. 12, pp.1718-1735, Dec. 1956.   DOI
9 Ben R. Hallford, Microwave Balanced Mixer Circuit, US3659206, Apr. 23, 1972.
10 Wilbur L. Pritchard, Carlo P. Domenichini, Balanced mixers which utilize image frequency power reflected from detector diodes, US2834876, May 13, 1958.
11 Henry J. Riblet, "The Short-Slot Hybrid Junction", 1952, IRE, p.180-184
12 Peter A. Rizzi, Microwave Engineering Passive Circuits, Prentice Hall, pp. 347-410, 1988.
13 Henry J. Riblet, Wellesley, Mass, Microwave hybrid junctions, US2739287, Mar. 20, 1956.
14 Henry J. Riblet, Wellesley, Mass, Microwave hybrid junctions, US2876421, Mar. 3, 1959.
15 http://www.fpga-faq.org/sb-metal_hold/CD_08/TheBrazingBook.pdf
16 M. Roulin, J. W. Luster, G. Karadeniz & A. Mortensen, "Strength and Structure of Furnace-Brazed Joints between Aluminum and Stainless Steel", Welding Journal, pp.151-155, MAY 1999.