THE DESIGN OF BRANCH GUIDE DIRECTIONAL COUPLERS FOR LOW AND HIGH POWER APPLICATIONS
Abstract
A design method for branch-guide couplers was developed which gives close to optimum performance over a given pass-band. The method was tested by analyzing the performance of several numerical designs, then constructing two couplers in waveguide and comparing the actual with the computed characteristics. The agreement was close. The design procedure is facilitated by a new chart constructed for this purpose; alternatively, most practical cases can be worked out from the tables by interpolation. The 0-db branch-guide coupler has been used as a harmonic pad (that is, a harmonic absorber in front of a harmonic rejection filter). Measurements to date have been confined to the TE10 mode, for which the padding achieved should be adequate for most practical purposes. A VSWR of better than 2:1 has been obtained at all harmonic frequencies up to the eleventh harmonic. The absorption of spurious frequencies improves as the frequency increases. The L-band 0-db coupler has passed over 5 megawatts of peak power in air at atmospheric pressure without any sign of arcing.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1962
- Accession Number
- AD0278717
Entities
People
- Leo Young
Organizations
- SRI International