Title :
Design and experimental validations of a new FSS conformal subreflector structure for Cassegrain systems
Author :
Floreani, M.G. ; Zich, Riccardo E. ; Aulisio, G. ; Besso, P. ; Somma, A.
Author_Institution :
Dipt. di Elettronica, Politecnico di Milano, Italy
Abstract :
A new conformal FSS subreflector structure for Cassegrain systems is here presented. The novelty of the proposed solution stands in the combination of dichroicity and conformal geometries in order to optimize the radiating performances. The frequency selectivity is introduced in order to obtain a surface with high transparency for the frequency band f/sub 1/ and high reflectivity for the other frequency band employed f/sub 2../ The shape of this surface is deformed in a such a way to reduce the spillover and the cross-polarization in order to increase the efficiency of the whole antenna. The experimental validations report the excellent obtained results for a 4 m antenna/520 mm subreflector system, in the frequency bands f/sub 1/ 1.9-2.3 GHz and f/sub 2/ 3.6-4.2 GHz.
Keywords :
UHF antennas; broadcast antennas; conformal antennas; electromagnetic wave polarisation; frequency selective surfaces; microwave antennas; multifrequency antennas; periodic structures; reflector antennas; 1.9 to 2.3 GHz; 3.6 to 4.2 GHz; Cassegrain systems; FSS conformal subreflector structure; SHF; UHF; antenna efficiency; broadcasting systems; conformal geometry; cross-polarization; frequency band; frequency bands; frequency selectivity; high reflectivity; high transparency surface; periodic dichroic structure; radiating performance optimization; spillover reduction; subreflector system; Adaptive arrays; Antenna accessories; Broadcasting; Computational geometry; Frequency selective surfaces; Periodic structures; Reflectivity; Reflector antennas; Shape; Transmitting antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2001. IEEE
Conference_Location :
Boston, MA, USA
Print_ISBN :
0-7803-7070-8
DOI :
10.1109/APS.2001.959724
