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A miniature coupled‐line‐based 3‐dB directional coupler using GaAs PHEMT process
Author(s) -
Chen ChihChiang,
Sim ChowYenDesmond,
Ho SaoAn
Publication year - 2016
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20924
Subject(s) - gallium arsenide , high electron mobility transistor , power dividers and directional couplers , optoelectronics , microwave , coupling (piping) , monolithic microwave integrated circuit , materials science , transistor , line (geometry) , electrical engineering , enhanced data rates for gsm evolution , engineering , telecommunications , voltage , mathematics , amplifier , geometry , cmos , metallurgy
A novel complementary‐conducting‐strip (CCS) coupled‐line (CL) design is proposed to achieve compact size by applying two‐dimensional layout and standard gallium‐arsenide (GaAs) thin‐film technology. To obtain high coupling and satisfy the design rules of GaAs process, mixed‐couple mechanism with edge and broadside coupling are also used. A CCS CL‐based Ka‐band 3‐dB directional coupler is fabricated using WIN 0.15‐μm GaAs pseudomorphic high electron mobility transistor technology. Experimental results show that the proposed directional coupler can cover the entire Ka‐band (26–40 GHz) with through and coupling of approximately 3.7 ± 0.25 dB, and isolation of better than 13 dB. In addition, the phase difference between the two output ports is approximately 90° ± 5°. The occupied area of the prototype (without I/O networks) is only 220 × 220 μm 2 . © 2015 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:21–26, 2016.