Dual-band planar quadrature hybrid with enhanced bandwidth response

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...

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Bibliographic Details
Published inIEEE transactions on microwave theory and techniques Vol. 54; no. 1; pp. 180 - 188
Main Authors Collado, C., Grau, A., De Flaviis, F.
Format Journal Article
LanguageEnglish
Published New York, NY IEEE 01.01.2006
Institute of Electrical and Electronics Engineers
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Applied sciences
Bandwidth
Circuit properties
Circuit topology
Coupling circuits
Dual band
Dual-band hybrid
Educational institutions
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Frequency measurement
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave integrated circuits
planar quadrature hybrid
Prototypes
Radio spectrum management
Wireless LAN
wireless local area network (WLAN) systems
Performance evaluation
Wireless LAN
Circuit design
Wireless telecommunication
Flexibility
wireless local area network (WLAN) systems
Hybrid coupler
Implementation
Circuit architecture
Dual-band hybrid
planar quadrature hybrid
Microwave circuit
Comparative study
Planar technology
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Summary: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
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.860306