Abstract

This chapter presents the principle of miniaturization of microwave patch antennas with improved performance. A considerable miniaturization of volume profile of a microwave patch antenna, with improving the power gain and efficiency, and with decreasing the intensity of near field, is possible by using the layered metal-dielectric metamaterial/composite for creating the substrates. It is assumed that the substrates have enhancement in the effective relative permittivity and/or permeability. It has been found that the larger the number of layers, the better the improvement in power gain and efficiency, if the volume profile is kept unchanged. The hybrid algorithm enabling to evaluate the basic relation between the resonant frequency and thickness of metamaterial/composite substrate is obtained in the chapter. The algorithm is created under assumption that maximum miniaturization of the volume profile is achieved for a microwave patch antenna with non-magnetic substrate with the enhancement in effective relative permittivity of substrate. It has also been shown that interchanging a high dielectric substrate with a metamaterial having the same values of effective relative permittivity or permeability enables to create compact multi-band and multi-directional patch antennas.

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