volume | PIER Journals

Abstract

This paper suggests a new method for designing of planar eight port waveguide mono-pulse comparator. Planar eight port waveguide mono-pulse comparator acts as a four-way in-phase power divider in a transmitting mode and as a mono-pulse sum and difference combining hybrid in the receiving mode. The short-slot directional coupler is converted to an equivalent magic tee by adding dielectric-slab-filled waveguide phase shifter. Four such hybrids are connected appropriately using H-plane bends to form a compact planar eight port waveguide mono-pulse comparator. Simulation results with Ansoft HFSS software are presented, which verify good performance.

1. Skolnik, M. I., Introduction to Radar Systems, 2 Ed., Tata McGraw Hill, New Delhi, 1999.

2. Varghese, J., M. S. Easwaran, S. Christopher, and Y. M. Rao, "Computer aided design of planar waveguide mono-pulse comparator for low height airborne antennas," Proc. Radar. 97 Electron. and Radar. Conf., 522-525, Oct. 1997.

3. Cornbleet, S., "Mono-pulse combining network," Electronics Letters, 158, Aug. 1965.
doi:10.1049/el:19650147

4. Hildebrand, L. T., "Results for a simple compact narrow-wall directional coupler," IEEE Microwave and Guided Wave Letters, Vol. 10, No. 6, 231-232, Jun. 2000.
doi:10.1109/75.852425

5. Rizzi, P. A., Microwave Engineering Passive Circuits, Prentice Hall, Englewood Cliffs, NJ, 1988.

6. Pozar, D. M., Microwave Engineering, Addison-Wesley, Reading, MA, 1990.

7. Kawai, T., A. Hino, Y. Kokubo, and I. Ohta, "Broad- band short-slot eightport hybrids," 32nd EuMC Proc., 621-624, 2002.

8. Wang, Z. X. and W. B. Dou, "A design of magic tee with coplanar arms," International Journal of Infrared and Millimeter Waves, Vol. 25, No. 6, 939-958, Jun. 2004.
doi:10.1023/B:IJIM.0000030793.91993.b0

9. Bland, G. F. and A. G. Franco, "Phase-shift characteristics of dielectric loaded waveguide," IRE Trans. on Microwave Theory and Techniques, 492-496, Nov. 1962.

10. Arnd, F., R. Frye, et al. "Double dielectric-slab-filled waveguide phase shifter," IEEE Transactions on Microwave Theory and Techniques, Vol. 33, No. 5, 373-381, May 1985.
doi:10.1109/TMTT.1985.1133008

11. Wang, Z.-X., W.-B. Dou, and Z.-L. Mei, "A compact H-plane magic tee designed at W band," Progress In Electromagnetics Research B, Vol. 5, 35-48, 2008.
doi:10.2528/PIERB08011706

Mr. Morteza Mohammadi

Professor Farrokh Hojjat-Kashani