The present invention relates to a feeder system comprising at least one horn and a sub-reflector, for double reflecting antenna systems, with high impedance surfaces for the reduction of surface currents and the generated electric field contributing to the increase of the secondary lobes and the counter-polar component. (Machine-translation by Google Translate, not legally binding)
1. A feeder system for dual reflector antennas, comprising: - a feed horn (2) coupled to a waveguide; and - a sub-reflector dish (10) having a frontal side (12) for reflecting radiation emitted by the feed horn, and a rear side (11), wherein the system is characterized in that it contains: - at least one first high-impedance surface disposed on the rear side of the sub-reflector dish. 2. A system as claimed in claim 1, wherein the first high-impedance surface comprises at least one axial corrugation. 3. A system as claimed in claim 1, wherein the first high-impedance surface comprises at least one choke of certain dimensions tuned to a critical frequency. 4. A system as claimed in any of the preceding claims, wherein the first high-impedance surface is defined by a first depth parameter, a second slot width parameter and a third wall width parameter. 5. A system as claimed in claim 4, wherein the first parameter, the second parameter and the third parameter have respectively a value of λ/4, λ/8 and λ/80 or greater. 6. A system as claimed in any of the preceding claims, wherein the first high-impedance surface comprises at least five chokes, wherein each of the chokes has dimensions different from or equal to the others. 7. A system as claimed in any of the preceding claims, further comprising at least one second high-impedance surface (31, 32) disposed at the waveguide. 8. A system as claimed in claim 7, wherein the second high-impedance surface comprises at least one array of side chokes (51) disposed exteriorly on the waveguide. 9. A system as claimed in any of the preceding claims, that further comprises support means for the sub-reflector dish. 10. A system as claimed in claim 9, wherein the support means are selected from among a radome (23), a dielectric element or lens (22) and a number of rods (24); 11. A system as claimed in any of the preceding claims, and further comprising a feed mast, where the waveguide is disposed interiorly along said feed mast. 12. A system as claimed in claim 11, and further comprising a main reflector dish (5), coupled at a first extremity of the feed mast, where the feed mast comprises two high-impedance surfaces (51, 52) with five chokes each; and where the sub-reflector dish is supported by a radome, in such a way that the frontal side of the sub-reflector dish is disposed in a position facing the feed horn that reflects the radiation towards the main reflector dish, and where the frontal side of the sub-reflector dish has an elliptical geometry.