Accession Number:

AD0654340

Title:

A MICROSTRIP-WAVEGUIDE HYBRID JUNCTION,

Descriptive Note:

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Report Date:

1959-01-26

Pagination or Media Count:

18.0

Abstract:

The device reported was built mainly in microstrip to perform the functions of a waveguide magic tee, while exhibiting broader bandwidth properties than the familiar rat-race circuit element. The exact equivalent, entirely in pure microstrip structures, of a waveguide magic tee cannot be built. The equivalent to the symmetric arms and the H arm of a magic tee were built in microstrip. The equivalent of the E arm is a waveguide normal to the junction of the microstrip arms and terminating through an aperture in the microstrip ground plane. The electrical isolation between the E and H arms is purely dependent on the mechanical and electrical symmetry which can be maintained during the construction of each assembly. The device is particularly suited for compact circuits at low microwave frequencies where rat-race units would have objectionably large diameters, and at high microwave frequencies where rat-race units would have conductor arms wide enough to approach overlap. Broad band matching of the structure is accomplished within the fringing fields of the junction by symmetrical structures introduced in the asymmetric arms. Author

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE