Antennas in the 20/30 GHz band for the ground segment of the ITALSAT system

A description is given of two antenna standards that were assessed to be capable of assuring the required service quality and availability. Both antennas have an offset configuration with three reflectors. The main reflector is a paraboloid which is realized with carbon-fiber multilayered materials. The two shaped metallic subreflectors and a specially designed feed system incorporating a frequency selective surface allow a compact antenna structure design that provides high gain, low sidelobes, and good cross-polarization performanc

Synthesis of Point-to-Multipoint Patch Antenna Arrays by Using Genetic Algorithms

The paper describes the design of a microstrip-patch antenna array with aperture coupled elements for application to point-to-multipoint radio links at 25 GHz. The array synthesis has been performed through an optimization scheme based on genetic algorithms (GAs

W-band prototype of platelet feed-horn array for CMB polarisation measurements

We present the design and performance of a 2x2 prototype array of corrugated feed- horns in W-band. The module is fabricated using a so-called \u201cplatelet\u201d technique by milling Alu- minum plates. This technique is suitable for low-cost and scalable high performance applications. Room temperature Return Loss measurements show a low (< 1230 dB) reflection over a 30% band- width with a maximum matching of -42 dB at 100 GHz for all four antennas. Beam pattern mea- surements indicate good repeatability and a low (-25 dB) sidelobe and crosspolarisation levels. This work is particularly relevant for future Cosmic Microwave Background polarisation measurements, which require large microwave cryogenic detector arrays coupled to high performance corrugated feed horns