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Patch-monopole monopulse feed for deep reflectors

Patch-monopole monopulse feed for deep reflectors

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A novel design for a simple and compact monopulse feed is presented for illuminating a deep reflector from the primary focal point, e.g. a rotationally symmetric single-reflector parabolic antenna, with a diameter-to-focal-distance ratio of around 0.4. The proposed feed is designed as a multimode circular cavity (cup) antenna. The elliptical patch excites a left-hand-circularly polarised mode for the sum channel. The monopole in the centre of the patch excites the orthogonal, linearly polarised mode for the difference channel. Two prototypes for such a feed were developed and fabricated, where the first was a proof-of-concept device and the second was a computer simulation-optimised version. Both the simulations and the measurements of the optimised prototype are presented.

http://iet.metastore.ingenta.com/content/journals/10.1049/el.2018.5753
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