A novel ortho-mode transducer (OMT) for dual-band dual-polarized communication systems is proposed in this letter. The OMT is loaded with five posts in reasonable positions of the waveguides and a shorted circuit piston in the branch waveguide. Compared with the septum loaded traditional one, the presented OMT is more flexible, simple and easy to fabricate. Both simulations and measurements indicate that the impedance bandwidths of VSWR<1.15 ranging from 6.50 to 7.20 GHz and 8.80 to 10.2 GHz can be obtained. The low insertion losses indicate that the presented OMT can be used in actual project. Moreover, good isolation performance between the two input ports in both bands are obtained because of the inherent existence of cross polarization.
2. Pisanu, T., P. Marongiu, A. Navarrini, and G. Valente, "A compact L-band ortho mode junction," Millimeter, Submillimeter, and Far-infrared Detectors and Instrumentation for Astronomy V, 774124, 2010.
doi:10.1117/12.856665
3. Anton, M. B., "Classification of ortho-mode transducers," European Transactions on Telecommunications, Vol. 2, 503-510, 1991.
4. Rosenberg, U. and R. Beyer, "Very compact ortho-mode transducer suited for integrated feed system solutions," Microwave, Communications, Antennas and Electronics Systems, 2011.
5. Tao, Y., Z. Shen, and G. Liu, "Dual-band ortho-mode transducer with irregularly shanped diaphragm," Progress In Electromagnetics Research Letters, Vol. 27, 1-8, 2011.
doi:10.2528/PIERL11080104
6. Ludovico, M. and B. Piovano, "CAD and optimization of compact ortho-mode transducers," IEEE Transactions on Microwave Theory and Techniques, Vol. 47, No. 12, 2479-2486, 1999.
doi:10.1109/22.808996
7. Tao, Y., Z. Shen, and G. Liu, "Closed-form expressions for the equivalent circuit model of square-waveguide T-junctions and its application in ortho-mode transducer design," IEEE Transactions on Microwave Theory and Techniques, Vol. 58, No. 5, 1167-1174, 2010.
doi:10.1109/TMTT.2010.2045524
8. Chattopadhyay, G. and J. E. Carlstrom, "Finline ortho-mode transducer for millimeter waves," IEEE Microwave and Guided Wave Letters, Vol. 9, No. 9, 339-341, 1999; Vol. 68, 15{33, 2007.
doi:10.1109/75.790467
9. Wu, H. C. and W. B. Dou, "A rigorous analysis and experimental researches of waveguide magic tee at W band," Progress In Electromagnetics Research, Vol. 60, 131-142, 2006.
doi:10.2528/PIER05112904
10. Thabet, R., M. L. Riabi, and M. Belmeguenai, "Rigorous design and e±cient optimization of quarter-wave transformers in metallic circular waveguides using the mode-matching method and the genetic algorithm," Progress In Electromagnetics Research, Vol. 68, 15-33, 2007.
11. Li, P. G. and A. T. Adams, "Multiple-post inductive obstacles in rectangular waveguide," IEEE Transactions Microwave Theory and Techniques, Vol. 32, No. 4, 365-373, Apr. 1984.
doi:10.1109/TMTT.1984.1132685
12. Soler, F. J. P., F. D. Q. Pereira, J. P. Garcia, D. C. Rebenaque, and A. A. Melcon, "Analysis of inductive waveguide microwave components using an alternative port treatment and e±cient fast multipole," Progress In Electromagnetics Research, Vol. 68, 71-90, 2007.
doi:10.2528/PIER06072001
13. Leviatan, Y., "Single-post inductive obstacles in rectangular waveguide," IEEE Transactions Microwave Theory and Techniques, Vol. 31, No. 10, 806-812, Oct. 1983.
doi:10.1109/TMTT.1983.1131610
14. Wu, X. and W. B. Dou, "Research on a compact millimeter wave ortho-mode transducer," Journal of Electromagnetic Waves and Applications, Vol. 21, No. 11, 1539-1549, 2007.
doi:10.1163/156939307782000325
15. Wang, H., H. Liu, B. Fan, and G. Liu, "Full wave analysis and optimization of the ortho-mode transducers," Binggong Xuebao/Acta Armamentarii, Vol. 30, No. 5, 613-616, 2009.
16. Umar, R., "Design and simulation of orthomode transducer in Ku-frequency band on HFSS," IEEE INMIC 2008: 12th IEEE International Multitopic Conference | Conference Proceedings, 290-293, 2008.
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