A Gregorian Confocal Reflector Antenna with Adjustable Subreflector for the Hybrid Mechanical-Electronic Pointing System at the Satellite Q/V Band

Pino, A.G.; Lorenzo, José Á. Martínez; Rubiños, Óscar; Arias, Marcos; Basterrechca, J.; Compostizo, C.; Scolamiero, L.

doi:10.1109/aps.2005.1552054

Cited by 2 publications

(1 citation statement)

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“…In this sense, once the determination of the reflector shape distortion is completed, the correction of the surface shape distortion is proposed to be done by actuators in [15][16][17][18] and the compensation of its impact on the resulting far-field pattern by using feed arrays as described in [19][20][21][22][23], but it is important to previously determine how distorted the reflector surface is and its impact on the antenna performance.…”

Section: Introductionmentioning

confidence: 99%

Analytical expressions for the evaluation of gravity distortion impact on the antenna efficiency applied to large antenna uplink arrays

Natera

Rodríguez-Osorio

Ariet

et al. 2018

IET Microwaves, Antennas & Propagation

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We present analytical expressions for the evaluation of the antenna efficiency loss due to the gravity distortion on large reflector antennas from 6 to 35 m diameter at X and Ka bands with a lack of usual complexity. These analytical expressions can be used to evaluate the gain reduction versus the maximum deviation of the rim of the reflector due to the gravity distortion extending the model proposed by JPL to other antenna diameter in the range of 6 to 35 m. These expressions were compared with the empirical model for gravity evaluation presented by the Jet Propulsion Laboratory for the DSN antennas obtaining a good match between both models. This is useful to specify the maximum distortion due to the gravity for antenna system design level. For this, a five steps procedure is presented starting with the estimation of the antenna efficiency reduction based on the analytical expressions as a function of the maximum gravity distortion, the antenna size and frequency band and concluding with the estimation of the gain of a single antenna as a function of the elevation angle. The case study is focused on error analyses for large antenna uplink arrays at X and Ka band.

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