期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 58, 期 9, 页码 2884-2893出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2010.2052571
关键词
Array; near field; phase conjugation; subwavelength imaging
资金
- Northern Ireland Strengthening all Island Mobile Wireless Futures Program
- U.K. Engineering and Physical Research Council [EP/D045835/1, EP/01707X1]
- Engineering and Physical Sciences Research Council [EP/E01707X/1, EP/D045835/1] Funding Source: researchfish
- EPSRC [EP/E01707X/1, EP/D045835/1] Funding Source: UKRI
The properties of a lumped loaded wire array as a means for near field focusing using phase conjugation is studied. The constructive role of phase conjugation in the near field image formation is justified both analytically and numerically. The generation of phase conjugated energy and how this is influenced by lumped impedance loading of the wires constituting the lens is discussed. In particular it is shown that inductive loading of the constituent lens wire elements is essential for subwavelength focusing since this leads to the creation of a phase conjugated near field predominantly determined by a convolution of the array current distribution with the real part of the Greens function which oscillates at a subwavelength scale. The characteristic resolution of the lens in terms of the full width at half maximum is shown to be similar to lambda/7 for a single source and better than lambda/4 for two dipole sources at lambda/10 source-lens separation distance.
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