Title :
A novel structure of tightly coupled lines for MMIC/MHMIC couplers and phase shifters
Author :
Xu, Yansheng ; Bosisio, Renato G.
Author_Institution :
Dept. de Genie Electr., Ecole Polytech. de Montreal, Que., Canada
fDate :
9/1/1997 12:00:00 AM
Abstract :
In this paper, a new structure of tightly coupled lines compatible with monolithic-microwave integrated-circuit/miniature hybrid-microwave integrated-circuit (MMIC/MHMIC) technology is introduced. Different from previous designs, short subsections of two or more different coupled lines are alternatively connected together to achieve the needed performance of a single-section coupler or phase shifter. Theoretical calculations are given and some typical design data are provided. A design example of a wide-band coplanar-waveguide (CPW) quadrature coupler using standard MMIC foundry technology is provided. Only metal-insulator-metal (MIM) capacitors and air-bridges are used to achieve tight coupling-no via holes are necessary. Experimental results are in good agreement with simulations. The proposed structure of coupled lines is very flexible and easily achieves very tight coupling factors
Keywords :
MMIC phase shifters; coplanar waveguides; hybrid integrated circuits; microwave integrated circuits; transmission line theory; waveguide couplers; MHMIC couplers; MIM capacitors; MMIC couplers; air-bridges; coplanar-waveguide coupler; design data; metal-insulator-metal capacitors; miniature hybrid MIC; miniature hybrid microwave integrated circuit; monolithic microwave integrated circuit; phase shifters; standard MMIC foundry technology; tightly coupled lines; wideband CPW quadrature coupler; Coplanar waveguides; Couplers; Coupling circuits; Foundries; Impedance; MIM capacitors; MMICs; Microstrip; Phase shifters; Wideband;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
