Using intentionally mismatching method

ABSTRACT A new ring hybrid is proposed which we call the double ring hybrid. The double ring hybrid is implemented by cascading two branch line hybrids that have intentionally mismatched port impedances between branch line hybrids. The proposed double ring hybrid using two quadrature branch line hyb...

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Bibliographic Details
Published in:Microwave and optical technology letters 2016-03, Vol.58 (3), p.638-642
Main Authors: Jang, Youna, Park, Minwon, Kim, Heehwang, Lim, Jongsik, Choi, Kwansun, Ahn, Dal
Format: Article
Language:English
Subjects:
branch line hybrid
Cascading
double ring hybrid
intentionally mismatched port impedances
Mathematical analysis
Microwaves
Planar structures
Ports
Quadratures
ring hybrid
same port directions
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Summary:ABSTRACT A new ring hybrid is proposed which we call the double ring hybrid. The double ring hybrid is implemented by cascading two branch line hybrids that have intentionally mismatched port impedances between branch line hybrids. The proposed double ring hybrid using two quadrature branch line hybrids not only has the same function as that of the conventional ring hybrid, but also has output ports in the same direction, since the isolation port is located on the opposite side of the output ports. Thus, unlike the conventional ring hybrid, the proposed double ring hybrid may be able to realize cascaded planar structures. The design equations are derived from the concept of the intentionally mismatched port impedances. The proposed double ring hybrid, regardless of whether the two branch line hybrids are connected, has a 12% reduced area compared to the conventional ring hybrid. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:638–642, 2016
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.29633