DocumentCode
1283427
Title
Broadband branchline coupler for S-band
Author
Paul, D.K. ; Gardner, P. ; Prasetyo, B.Y.
Author_Institution
Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK
Volume
27
Issue
15
fYear
1991
fDate
7/18/1991 12:00:00 AM
Firstpage
1318
Lastpage
1319
Abstract
The design of an S-band, broadband, microstrip 3 dB, 90 degrees branchline coupler is described and measured results for a prototype version are given. The design uses broadbanding stubs and three branches, with the central branch split into two of twice the characteristic impedance and separated by half wavelength transmission lines. This is a new technique to improve the bandwidth of which a theoretical account was given by Mayer (see ibid., vol.26, no.18, p.1477-8, 1990). Measured results for the prototype coupler show return loss greater than 17 dB and isolation greater than 16.5 dB, over a percentage bandwidth of 45%.
Keywords
microwave integrated circuits; strip line components; waveguide couplers; 17 dB; MIC, microwave circuit application; S-band; branchline coupler; broadband; broadbanding stubs; characteristic impedance; half wavelength transmission lines; microstrip; return loss;
fLanguage
English
Journal_Title
Electronics Letters
Publisher
iet
ISSN
0013-5194
Type
jour
DOI
10.1049/el:19910828
Filename
81213
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