Blockage minimization in Cassegrain and Gregorian reflectors with increased flexibility

Tadjalli, A.; Rashed-Mohassel, J.

doi:10.1109/aero.2002.1035699

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…The manufactured antenna and its feed are shown in Figure 8. By using this 4-horn array antenna feed, we can obtain sum and difference antenna patterns that are used in monopulse radar [18]. The dimensions of the antenna are shown in Figure 9.…”

Section: Antenna Designmentioning

confidence: 99%

“…Also designing optimized and/or EBG feed for reflector antennas is a way for increasing efficiency of reflector antennas [7][8][9][10][11][12]. Moreover other techniques are available for reducing the aperture blocking by the subdish of the cassegrain system [13][14][15][16][17][18][19]: one method minimizes the blocking by optimizing the geometry of the feed and subdish; other methods avoid the blocking by means of polarization-rotation schemes. The latter methods are available for any application not requiring polarization diversity, and an optimized set of polarizationoperative surfaces has been developed for these cassegrain antennas.…”

Section: Introductionmentioning

confidence: 99%

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Compact Low Weight High Gain Broadband Antenna by Polarization-Rotation Technique for X-Band Radar

Dastkhosh

Oskouei

Khademevatan

2014

International Journal of Antennas and Propagation

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Less efficiency and gain is achieved by existence of aperture blocking phenomena in cassegrain antenna caused by the presence of subreflector or antenna feed. Also, length of feed cables causes delay which is another undesirable problem in antennas, since errors and less precision of detecting targets are created. To overcome these problems, low weight and compact optimized polarization-rotation monopulse cassegrain antenna is designed in this paper. The goal of our proposed rotating antenna is achievement of sum and difference patterns for target tracking in monopulse radar. In our work, left part of hyperbolic subreflector instead of right one has been used for reducing size of the antenna. The antenna is fabricated by grid wires instead of solid sheet metal reflectors and with composite technology for decreasing its weight. Width and volume of the antenna reduce by about 50% in comparison to other reflector antennas. This antenna has been simulated and manufactured in X-band and simulation data are in good agreement with measured ones. The antenna has the average gain of 35 dB from 8.5 up to 9.5 GHz. Also the antenna feed bandwidth is more than 50% and the antenna has efficiency of about 50% from 8 up to 10 GHz.

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Section: Antenna Designmentioning

confidence: 99%