| 摘要 |
<p>Parallel information channels are discovered on dipole antennas closely coupled to each other. There channels are supported by different radiation modes in the form of multipoles or combination of multipoles. The spacing between antennas only impacts the radiation impedances of the higher order modes. Through a multiport impedance matching network, these modes can be separated into different driving ports and matched individually. This finding can lead to practical superdirective arrays for beamforming and superdiverse antennas for MIMO applications. A pair of closely coupled dipole antennas is used as an example to illustrate this concept. Analysis has shown, with a pair of half-wave dipoles at 0.1 ? spacing, double of the channel capacity resulted from the diversity increase and more than 3 times of the gain and directivity of a single half-wave dipole can be achieved. The theory can be extended for a large number of closely coupled antenna elements.</p> |
