A microstrip phase-trim device using a dielectric overlay

Author

Couker, M.A. ; Kushner, Lawrence J.

Author_Institution

Lincoln Lab., MIT, Lexington, MA, USA

Volume

42

Issue

11

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

2023

Lastpage

2026

Abstract

A design procedure is given for a microstrip phase-trim device using a dielectric overlay on a conventional microstrip line. The physical operation of the device is based on the change in the effective dielectric constant of the microstrip line caused by the presence of the dielectric layer on top of the microstrip line. The amount of phase trim produced by the device can be selected by the appropriate choice of dielectric constant, height, and length of the dielectric overlay. An approximate expression is given for the effective dielectric constant of the microstrip line as a function of the dielectric constant and height of the overlay. Measured results at 10 GHz are compared with predicted performance

Keywords

dielectric thin films; microstrip circuits; microwave circuits; permittivity; 10 GHz; design procedure; dielectric overlay; effective dielectric constant; microstrip line; microstrip phase-trim device; Capacitance; Circuits; Dielectric constant; Dielectric devices; Dielectric measurements; Dielectric substrates; Impedance; Manufacturing; Microstrip; Transmission line measurements;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.330113

Filename

330113