Share Email Print

Proceedings Paper

New phase shifters for smart systems
Author(s): Charles M. Jackson
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Recent advances in ferroelectric and high temperature superconductive technology have enabled new phase shifters incorporating ferrite, ferroelectric, and high temperature superconductor materials to be developed. Each material offers important and unique properties which may be combined with one of the other materials to obtain useful phase shifters. Ferrite materials with tunable magnetic permeabilities have classically been used for phase shifters. Ferrites offer large phase shifts with small changes in insertion loss. Ferroelectric materials employing variable dielectric constants can also be used as phase shifters. One advantage of ferroelectric phase shifters over ferrite phase shifters, ultra-wideband performance, enables coverage of the entire band from 2 to 18 GHz. Superconductors offer low losses and unique properties including the kinetic inductance effect and SQUIDs. The physics of the three materials will be reviewed briefly, and the difference between ferroelectricity and ferromagnetism will be discussed. Combination of magnetic and superconducting materials is possible, despite the fact that magnetic fields suppress superconductivity. A comparison of variable time delay and phase shift devices will show interesting contrasts between these devices and MMIC components. Superconducting phase shifters using only superconducting properties, and phase shifters combining superconductivity with ferrites or ferroelectrics will be described.

Paper Details

Date Published: 26 May 1995
PDF: 8 pages
Proc. SPIE 2448, Smart Structures and Materials 1995: Smart Electronics, (26 May 1995); doi: 10.1117/12.210463
Show Author Affiliations
Charles M. Jackson, TRW, Inc. (United States)

Published in SPIE Proceedings Vol. 2448:
Smart Structures and Materials 1995: Smart Electronics
Vijay K. Varadan, Editor(s)

© SPIE. Terms of Use
Back to Top