IEEE Transactions on Microwave Theory and Techniques · 1993 · 15 citations · 10 references
EngineeringElectrical EngineeringMicroelectronicsMicrowave EngineeringSemiconductor DevicesCoupled CircuitsImpedance MatchingIntegrated Circuit DesignMicrowave Integrated CircuitsMicrowave Passive ComponentsRadio-frequency Integrated CircuitsBandwidthBroadband Coupler DesignCoupled-line CouplersCouplersMicrostrip CouplersMicrowave Integrated Circuit DesignMillimeter-wave Integrated CircuitsMonolithic Microwave Integrated Circuit Design
The authors present a highly manufacturable coupled line structure for MMICs (monolithic microwave integrated circuits) which uses embedded microstrip to achieve tight coupling and only uses the process steps necessary to make MIM (metal-insulator-metal) capacitors. Passive circuits demonstrated using this technique include a single-section 5-21-GHz broadband 3-dB coupler and a 6-15-GHz 90 degrees Schiffman section. The coupler and the Schiffman section use tight (2-dB) to extremely tight (0.7-dB) coupling factors, respectively. This is the first time that a coupler has achieved such a wide bandwidth on a 125- mu m-thick GaAs substrate.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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