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Using the theory of network characteristic modes, a planar inverted-F antenna and a microstrip patch antenna are systematically modified to obtain multiband performance at arbitrary frequencies. Each is loaded at multiple points with reactive loads consisting of multiple lumped resonators computed directly using equations derived from network characteristic mode theory.
A characteristic mode analysis of an electrically large bifilar helix is presented in this paper. Characteristic mode analysis is typically performed on electrically small to intermediate size antennas for simplicity. When the antenna becomes electrically large, there are many modes and it is difficult to identify the dominant modes. A procedure for determining the important characteristic modes is...
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