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A printed electrically small loop-loaded dipole antenna is upgraded to radiate dual-band isotropic patterns with compelling compactness. The proposed technique can be easily extended for multi-band or reconfigurable designs. Simulation of a 0.1lambda antenna shows peak deviations of radiation power density pattern in the full space are below 4.0 dB for both bands.
Information channels supported by orthogonal radiation modes in a coupled antenna system are ideal choices to form MIMO signal channels. Due to their orthogonal nature in radiation, it can potentially result in coupling free and correlation free channels regardless of antenna size and spacing. Those channels can be used toward enhancements of diversity, gain and bandwidth for the benefit of the system...
This paper here proposes to end-load a small dipole with loops. The electrically small printed antenna resonates by itself and presents a pure input resistance at a much lower frequency than resonating frequencies of regular dipoles and loops.
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