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

Volume

45

Issue

9

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

1594

Lastpage

1599

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;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.622927

Filename

622927