Compact Microwave Impedance Matching Using Patterned Conducting Planes
Keywords:
Frequency selective surfaces, genetic algorithm, impedance matching, magnetic field integral equation, patterned conducting planesAbstract
? In this paper, a novel structure for impedance matching in microwave frequency range is introduced. The proposed structure utilizes one or more patterned conducting planes, which are placed transversely in a waveguide. The patterned conducting planes act as frequency selective surfaces for impedance matching purposes. The Green’s function of one or more desired patterned planes, considering coupling effects between them, is obtained. Then magnetic field integral equations, in terms of unknown magnetic currents of patterned planes, are calculated and solved using method of moment. The suitable pattern of a patterned plane is obtained using optimization by genetic algorithm, so that the return loss of whole structure, in the desired frequency range vanishes. The proposed structure, compared with traditional impedance matching structures, is very compact and wideband. It has been shown that its length, in comparison with another compact and wideband microwave impedance matcher, is fifty times shorter. The usefulness of the proposed structure and its performance is verified in some examples, and the response of designed impedance matchers are compared with the results of simulations.
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