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A Miniaturized Branch‐Line Coupler Using Triangular Patch Type Artificial Transmission Line
Author(s) -
Oh SongYi,
Hwang HeeYong
Publication year - 2013
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.27688
Subject(s) - miniaturization , rat race coupler , microstrip , magic tee , hybrid coupler , isosceles triangle , microwave , line (geometry) , transmission line , electrical engineering , optics , hexagonal crystal system , electric power transmission , physics , engineering , geometry , power dividers and directional couplers , telecommunications , mathematics , chemistry , crystallography
ABSTRACT A branch‐line coupler using microstrip artificial transmission lines (ATLs) with slotted triangular patches is proposed. For the ATL, a five‐section stepped‐impedance line (SIL) is compactly folded into a right angle isosceles triangle, and the effect of the slot width between folded lines is analyzed. The designed branch‐line coupler is composed of four ATLs, so that it has a maximally compact rectangular geometry. A further miniaturization by changing patch shape and the performance analysis according to the slot widths between the four ATLs are carried out. The fabricated 3‐dB branch‐line coupler has comparable electrical performance and only 10.9% area compared to the conventional branch‐line coupler at 0.717 GHz, which is one of the smallest couplers among similar studies that have been reported. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1718–1721, 2013