A novel broadband coaxial orthomode transducer with high port isolation
DOI:
https://doi.org/10.1109/ICATT.2009.4435194Keywords:
coaxial orthomode transducer, dual-band, neural-genetic algorithm, neural networkAbstract
A novel compact design of a broadband orthomode transducer with circular coaxial waveguide input and two orthogonal highly isolated rectangular waveguide outputs is presented. A neural-genetic algorithm is used to optimize the inner architecture of the OMT. Within the operational frequency band 3.4–4.2 GHz input return loss is less than –20 dB and isolation between ports is better than 30 dB. The TEM mode in coaxial structure is not excited due to the special design of the OMT.References
NAVARRINI, A.; PLAMBECK, R.L. A turnstile junction waveguide orthomode transducer. IEEE Trans. Microw. Theory Tech., 2006, v.54, n.1, p.272-277.
ZHANG, H.Z. Dual-band coaxial feed system with ridged and T-septum sectoral waveguides. IEE Proc.-Microw. Antennas Propag., 2005, v.152, n.5, p.305-310.
DUBROVKA, F.F.; VASYLENKO, D.O. Synthesis of UWB planar antennas by means of natural optimization algorithms. Radioelectronics and Communications Systems, 2009, v.52, n.4, p.167-178, DOI: http://dx.doi.org/10.3103/S0735272709040013.
VASYLENKO, D.O.; EDENHOFER, P.; DUBROVKA, F.F. Genetic algorithm based inversion of neural networks applied to the optimized design of UWB planar antennas. Electron. Lett., 2008, v.44, n.3, p.177-179.
RAHMAT-SAMII Y.; MICHIELSSEN, E. Electromagnetic Optimization by Genetic Algorithms. New York: J. Wiley, 1999.
HAYKIN, S. Neural Networks: A Comprehensive Foundation. NJ: Prentice Hall, 1994.
