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This paper compares the design and performance of two types of wide band multi-octave MMIC couplers. An active coupler is based on pHEMT devices and fabricated in a GaAs foundry and a passive coupler uses coplanar waveguide (CPW) multilayer techniques. The multilayer couplers are fabricated on GaAs semi-insulating substrate and are reciprocal and directional. The active coupler design is adapted from...
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