Broadband Magic Tee Hybrid.
Final technical rept.,
SEDCO SYSTEMS INC MELVILLE N Y
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This program was conducted to develop a Broadband Magic Tee Hybrid compatible with WRD750D24 ridge waveguide operating over a frequency band from 7.5 to 18 GHz. The hybrid tee is designed for a power handling capability of 1 Kw CW or 10 Kw peak. The device will find application in waveguide matrices which are used to combine the output of several high power traveling wave tube amplifiers operating in parallel, as well as in the fabrication of high power waveguide switch networks and as monopulse beam forming devices in antennas. The principal effort of the program was directed toward impedance matching the sum and difference ports of the hybrid tee junction. Laboratory brassboards, as well as aluminum production prototypes, were fabricated and tested. The desired maximum VSWR of the device was 1.51 over the entire frequency range. It was demonstrated that this VSWR level could be obtained over most of the frequency band with a peak value of 1.71 at the edges of the frequency band. As part of the hybrid tee design effort, a computer program was written to analyze the VSWR performance of the hybrid in terms of physical dimensions. This program was found useful in determining the first approximation for the hybrid tee design. Empirical tests on laboratory brassboard hybrids provided a closer second approximation. The final design was completed in aluminum production prototype models. In addition, an analysis was performed which demonstrated the application of the hybrid tee junctions to a high power four port ridge waveguide matrix.
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