Progress In Electromagnetics Research M
ISSN: 1937-8726
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By X. Gu, S. Jain, R. Mittra, and Y. Zhang

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We propose a technique for enhancing the angular resolution of a flat-base Luneburg lens antenna to enable it to detect multiple targets with arbitrary scattering cross-sections that are located in angular proximity. The technique involves measuring the electric field distribution on the flat plane of the Luneburg lens antenna, operating in the receive mode, at a specified number of positions, and correlating these distributions with the known distributions derived from the field distributions in the measurement plane generated by single target at different look angles. We show that the proposed approach can achieve enhanced resolution than the basis of the beam-width of the Luneburg lens antenna, and it is capable of distinguishing between two targets with different scattering cross-sections that have an angular separation as small as 1˚ for a Luneburg lens with 6.35λ aperture size, for Signal-to-Noise Ratio (SNR) better than 20 dB.

X. Gu, S. Jain, R. Mittra, and Y. Zhang, "Enhancement of Angular Resolution of a Flat-Base Luneburg Lens Antenna by Using Correlation Method," Progress In Electromagnetics Research M, Vol. 37, 203-211, 2014.

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