RECIPROCAL FERRIMAGNETIC DIGITAL PHASE SHIFTERS.
Abstract
The objective of the work was to develop reciprocal, ferrimagnetic, digital phase shifters in waveguide and TEM transmission lines. The phase shifters operate over the frequency band of 2.9 GHz to 3.5 GHz and in their present state are primarily useful as laboratory units. The TEM unit has been designed in strip transmission line with a ground plane spacing of 0.200. The center conductor is 0.025 by 0.125 giving an impedance of about 17 ohms. Matching is accomplished by means of a two-section dielectric transformer giving a VSWR of 1.5:1.0 over a very wide band. The ferrite toroids are asymmetrical in nature to improve the remanent flux level and to allow the use of the new technique of reverse-pulse demagnetization. The best figure of merit obtained was 175 degrees/db and the power handling capacity approximated 150 watts. The switching time is 3 micro s minimum and the energy required under normal conditions is about 3000 micro j per complete cycle. The most successful waveguide design consists of a dual toroid structure mounted in the guide center with both toroids magnetized in the same direction. Experimentally, the best figure of merit obtained was 80 degrees/db operating between the magnetized and demagnetized states. A computer program has been modified to analyze the waveguide structure and has been successfully run. Data indicates the possibility of building waveguide reciprocal phase shifters with losses of 1.5 db/360 degrees which are only 12 inches long. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1967
- Accession Number
- AD0824236
Entities
People
- J. L. Brediger