Title :
Dual-band planar quadrature hybrid with enhanced bandwidth response
Author :
Collado, Carlos ; Grau, Alfred ; De Flaviis, Franco
Author_Institution :
Dept. of Signal Theor. & Commun., Tech. Univ. of Catalonia, Barcelona
Abstract :
This paper presents the theory, design procedure, and implementation of a dual-band planar quadrature hybrid with enhanced bandwidth. The topology of the circuit is a three-branch-line (3-BL) quadrature hybrid, which provides much larger flexibility to allocate the desired operating frequencies and necessary bandwidths than other previously published configurations. A performance comparison with other dual-band planar topologies is presented. Finally, a 3-BL quadrature hybrid for dual band (2.4 and 5 GHz) wireless local area network systems was fabricated, aimed to cover the bands corresponding to the standards IEEE802.11a/b. The measurements show a 16% and 18% bandwidth for the lower and upper frequency, respectively, satisfying and exceeding the bandwidth requirements for the above standards
Keywords :
hybrid integrated circuits; microwave integrated circuits; wireless LAN; 2.4 GHz; 5 GHz; IEEE802.11a-b standards; bandwidth requirements; circuit topology; dual-band planar topologies; three branch line quadrature hybrid; wireless local area network systems; Bandwidth; Circuit topology; Coupling circuits; Dual band; Educational institutions; Frequency measurement; Microwave integrated circuits; Prototypes; Radio spectrum management; Wireless LAN; Dual-band hybrid; planar quadrature hybrid; wireless local area network (WLAN) systems;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2005.860306
