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Impact of metallization layer structure on the performance of G-band branch-line couplers

: Amado-Rey, A.B.; Campos-Roca, Y.; Weber, R.; Maroldt, S.; Tessmann, A.; Massler, H.; Wagner, S.; Leuther, A.; Ambacher, O.


IEEE microwave and wireless components letters 25 (2015), Nr.12, S.793-795
ISSN: 1051-8207
ISSN: 1531-1309
Fraunhofer IAF ()
branch-line; electromagnetic (EM) simulatelectromagnetic simulation; grounded coplanar waveguide (GCPW); hybrid; millimeter-wave

Five different versions of grounded coplanar waveguide (GCPW) branch-line couplers on GaAs were EM simulated, processed and investigated for operation in G-band (140-220 GHz), based on different layer structures (including 2 or 3 metallization layers) and layouts. The best results have been obtained with the structures based on a continuous galvanic metal in the central conductor line and ohmic connections between top ground planes, reducing the insertion losses by 0.8 dB. A measured amplitude imbalance less than 0.5 dB from 160 to 200 GHz (22%), with a coupler insertion loss lower than 1.3 dB was achieved for a 3 metallization layer branch-line coupler.