Abstract—The dual transmission lines are proposed to replace
conventional quarter-wavelength transmission lines for a compact
microstrip branch-line coupler in this study. The developed coupler
can be easily fabricated on the printed circuit board without
lumped element; moreover, its size is greatly reduced compared to
the conventional branch-line coupler. Furthermore, simulated and
measured frequency responses match well to validate the proposed
coupler with dual transmission lines.
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Miniaturization of Microstrip Branch-Line: 04459077.pdf
