APPLICATION OF FERROELECTRIC MATERIALS TO MICRO WAVE CIRCUITS
Abstract
A theory to describe the behaviour of a reac tively terminated transmission line is presented. The experimental data is in good agreement with the theory. Phase shifts of 100 degrees per db loss were achieved in this type of device using commercially available ferroelectrics. A trans mission phase shifter using two reactively term inated phase shifters and a 3 db hybrid was made and tested. Fifty five degrees phase shift with 0.9 db loss was obtained. A theory describing a tunable travelling wave filter is discussed and some experimental data is presented. A description of two methods of making dielectric constant measurements is reviewed and experi mental results are given. An investigation of colemanite is described. It is concluded that commercially available ferroelectric materials have relatively high loss tangents and that for this reason the phase shift to loss ratio of ferroelectrics is almost one order of magnetitude lower than that of ferrites. Moderately good phase shifters can be made in coaxial lines in very small sizes. Direct transmission phase shifters suffer because of difficult matching problems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1962
- Accession Number
- AD0403800
Entities
People
- Robert L. Orrick