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Multiple-beam Focal-plane Dual-band Fabry-Perot Cavity Antenna with Reduced Beam-degradation

Lima, E.B. ; Costa, J.R. ; Fernandes, C. A.

IEEE Transactions on Antennas and Propagation Vol. 67, Nº 7, pp. 4348 - 4356, July, 2019.

ISSN (print): 0018-926X
ISSN (online): 0018-926X

Scimago Journal Ranking: 1,70 (in 2019)

Digital Object Identifier: 10.1109/TAP.2019.2911365

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Focal plane reflector feeds with shared aperture are a promising solution for the increasing number of beams required in Ka-band satellite services. Stringent manufacturing tolerances and coupling between feeds tend to penalize performance, which is aggravated for dual-band. This manuscript proposes a new design of a shared aperture antenna intended for multi-spot single-feed-per beam satellite applications that allows recovering singlefeed performance, minimizing the usual impact of adjacent feeds on the field distribution and ultimately on the antenna directivity and gain. We present a newf focal-plane dual-band Fabrv-Pérot cavity antenna (FPCA) design, which allows more reliable fabrication, closer agreement with simulations and larger bandwidth than reported solutions. It uses only one double-sided printed FSS to form the dual-band FPCA, and it is fed through a novel arrangement of double-layer slots in the FPCA printed ground plane. This favors impedance matching and higher isolation between adjacent feeds. The effectiveness of the solution is experimentally demonstrated for a single-feed Ka-band (20GHz and 30GHz) prototype. The generalization for a complete multifeed configuration with filters is show’n by full-wave simulations. The de-coupling slots on the FPCA ground plane enable restoring single-feed performance in the multi-feed system, over the bandwidth of interest.