Abstract

A side-fed bifilar helix antenna can be integrated with a quadrifilar helix antenna in a piggy back configuration in order to achieve a dual-mode radiating structure. The overall length of the structure is 0.44λ at the resonant frequency (1.54 GHz) of the space mode antenna and 0.39λ at the resonant frequency (1.34 GHz) of the terrestrial mode antenna. The computed results are validated by experimental data.

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