Design and realization of high directivity microstrip coupler

ABSTRACT A method to improve the directivity of the microstrip coupler is presented. The structure of the coupler is modified for variable coupling coefficient. Using this structure, the power coupled to the isolated port can be controlled which results in high directivity. Using this procedure, 15‐...

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Bibliographic Details
Published in:Microwave and optical technology letters 2015-05, Vol.57 (5), p.1078-1081
Main Authors: Maheswari, Shanmugam, Jayanthy, Thankappan
Format: Article
Language:English
Subjects:
coupled lines
Coupling coefficients
directional coupler
Directivity
Joining
Mathematical models
microstrip
microwave
Microwaves
Noise levels
Ports
Simulation
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Summary:ABSTRACT A method to improve the directivity of the microstrip coupler is presented. The structure of the coupler is modified for variable coupling coefficient. Using this structure, the power coupled to the isolated port can be controlled which results in high directivity. Using this procedure, 15‐dB couplers are designed and fabricated at 0.9 GHz. A high directivity of 43 dB is measured. The validity of the design concept is verified by simulations and measurements. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1078–1081, 2015
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.29019