Title :
Design of a K- thru Ka-band modified Butler matrix feed for a 4-arm spiral antenna
Author :
Sutton, Nathan ; Filipovic, Dejan S.
Author_Institution :
Dept. of Electr., Comput., & Energy Eng., Univ. of Colorado, Boulder, CO, USA
Abstract :
A computational model of a wideband μ-coaxial based modified 4×4 Butler matrix feed network for a four-arm spiral antenna is discussed in this paper. Each component within the Butler matrix is fully characterized using the finite element method and their performance is compared with the commercially available counterparts. A method of moments model of a four-arm spiral antenna for 18-40 GHz is also developed and used to determine the effects of the Butler matrix feed on the antenna pattern purity. The designed Butler matrix is 22 × 20 × 1 mm (L × W × H) in size and operates over the entire 18-40 GHz range.
Keywords :
antenna feeds; antenna radiation patterns; finite element analysis; spiral antennas; FEM; K-band modified Butler matrix feed; Ka-band modified Butler matrix feed; antenna pattern purity; finite element method; four-arm spiral antenna; frequency 18 GHz to 40 GHz; wideband μ-coaxial; Butler matrix; Couplers; Layout; Phase shifters; Spirals; USA Councils;
Conference_Titel :
Antennas and Propagation Conference (LAPC), 2010 Loughborough
Conference_Location :
Loughborough
Print_ISBN :
978-1-4244-7304-5
DOI :
10.1109/LAPC.2010.5666917
