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Design analysis and fabrication of lumped‐distributed branch‐line couplers for coplanar waveguide mmics
Author(s) -
Gillick M.,
Robertson I. D.,
Joshi J. S.
Publication year - 1993
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.4650061216
Subject(s) - coplanar waveguide , monolithic microwave integrated circuit , miniaturization , amplifier , electrical impedance , power dividers and directional couplers , return loss , electronic engineering , electrical engineering , electronic circuit , integrated circuit , engineering , optoelectronics , materials science , microwave , telecommunications , antenna (radio) , cmos
Abstract An analysis of lumped‐distributed coplanar waveguide (CPW) branch‐line couplers suitable for GaAs MMIC designs is presented. This investigation takes into account the degree of coupling, impedance transformation, and levels of miniaturization in order to provide a greater design flexibility for integration with uniplanar monolithic circuits. Synthesis techniques and design graphs are given for these couplers and a monolithic 50‐15‐OM version has been fabricated and tested. The coupler's measured results show an amplitude balance of 4.7 × 0.3 dB, input and output return losses of better than 12 and 15 dB, respectively, and an isolation of better than 20 dB over the range 14–16 GHz. This new method of designing miniaturized couplers demonstrates their suitability for balanced amplifiers, especially when they are incorporated into CPW MMICs. © 1993 John Wiley & Sons, Inc.