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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
Published in:
Microwave Theory and Techniques, IEEE Transactions on
(Volume:54
,
Issue:
1
)
Date of Publication: Jan. 2006
- Page(s):
- 180 - 188
- ISSN :
- 0018-9480
- INSPEC Accession Number:
- 8961985
- Digital Object Identifier :
- 10.1109/TMTT.2005.860306
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 10 January 2006
- Issue Date :
- Jan. 2006
- Sponsored by :
- IEEE Microwave Theory and Techniques Society
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