Mode suppressing coplanar waveguide transition and method

A series capacitance is included in both surface ground conductors of coplanar waveguide on an MMIC die. The capacitance compensates for the inductance of bond wires used for transitioning from microstrip line to coplanar waveguide. The capacitance is chosen to resonate with the inductance of the bo...

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Bibliographic Details
Main Authors FRASER; MICHAEL L, SCHUMACHER; LAWRENCE JAMES
Format Patent
LanguageEnglish
Published 07.07.1998
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRICITY
RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
WAVEGUIDES
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Summary:A series capacitance is included in both surface ground conductors of coplanar waveguide on an MMIC die. The capacitance compensates for the inductance of bond wires used for transitioning from microstrip line to coplanar waveguide. The capacitance is chosen to resonate with the inductance of the bond wires at the desired frequency. As a result, virtually all microstrip mode ground signal currents are transitioned from the ground plane of the microstrip line to the surface ground conductors of the coplanar waveguide. Microstrip modes affecting the coplanar waveguide are significantly reduced improving isolation between ports of the MMIC die.
Bibliography:Application Number: US19950452215