Title :
A modified Butler matrix for tapered excitation of scanned arrays
Author :
Fragola, A. ; Orefice, M. ; Pirola, M.
Author_Institution :
Dipt. di Elettronica, Politecnico di Torino, Italy
Abstract :
We present a modified Butler matrix that allows the excitation distribution of an array to be tapered. The output section of the matrix is replaced by a network of branch-line hybrids, some of them unbalanced, to modify the power distribution in the output lines. This technique allows flexibility in the choice of the excitation coefficient and eliminates some of the drawbacks of conventional solutions.
Keywords :
UHF antennas; antenna arrays; antenna feeds; scanning antennas; strip line circuits; 1.7 to 1.9 GHz; 52 cm; 75 cm; beam forming technique; branch-line hybrids; excitation coefficient; modified Butler matrix; power distribution; scanned arrays; symmetrical stripline geometry; tapered excitation; Antenna arrays; Antenna feeds; Butler matrix; Circuits; Optical coupling; Phase shifters; Phased arrays; Power distribution; Signal generators; Transmission line matrix methods;
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.2001.959582
