Title :
A New Low Loss Rotman Lens Design for Multibeam Phased Arrays
Author :
Schulwitz, Lora ; Mortazawi, Amir
Author_Institution :
Dept. of Electr. Eng., Michigan Univ., Ann Arbor, MI
Abstract :
The design methodology and analysis of a new low loss Rotman lens beam-forming network is presented. With the introduction of dielectric contours of varying permittivity within the lens, enhanced focusing is achieved. The varying permittivity is realized through a synthesized dielectric technique, where a periodic lattice of holes is formed within the dielectric substrate. In comparison to a conventional Rotman lens of similar shape and size, this new enhanced focused Rotman lens shows an insertion loss improvement of 1.2 to 2.0 dB. Also, the decrease in gain at the extreme scan angles is reduced from 1.5dB to 0.7dB
Keywords :
antenna phased arrays; dielectric materials; lens antennas; multibeam antennas; permittivity; 1.2 to 2.0 dB; beamforming network; dielectric contours; dielectric substrate; insertion loss; low loss Rotman lens design; multibeam phased arrays; periodic lattice; Design methodology; Dielectric substrates; Insertion loss; Lattices; Lenses; Network synthesis; Optical design; Permittivity; Phased arrays; Shape; Antenna array feeds; Rotman lens; beam steering; multiple beam; phased arrays;
Conference_Titel :
Microwave Symposium Digest, 2006. IEEE MTT-S International
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-9541-7
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2006.249587
