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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.
A loop-loaded dipole that combines the impedance and radiation characteristics of a small dipole and a small loop on a printed circuit board is proposed. Simulation shows a near-isotropic radiation pattern from a self-resonating 0.1lambda antenna prototype with 3.8 dB maximum gain deviation in the full space.
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.
By taking a time domain approach, Wheeler's limit can be understood as the following. As the antenna becomes smaller, the ratio of energy required to be stored in the near field to the energy radiated per period becomes larger. Therefore, the time it takes to replenish the near-field active energy before the antenna can radiate efficiently increases. When the rate of signal becomes higher than the...
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