Design Considerations for a Half Impulse Radiating Antenna.
Final rept. Mar 95-Jan 96,
FARR RESEARCH ALBUQUERQUE NM
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Recently developed pulsers have the capability to generate approximately 100GW of peak power with an impulse width of about 130 PS Full Width Half Max, and with a repetition rate of about 1 kHz. However, all these hydrogen-gap pulsers produce output into a coaxial waveguide, which is a single-ended configuration. This configuration is difficult to match to an antenna, since most free space antenna designs require a balanced feed. One can convert the signal to a balanced configuration with a coaxial unzipper or point geometry converter, but there may be losses associated with these transitions. An alternative is to feed the signal into half a reflector Impulse Radiating Antenna IRA. For this project, we developed the design principles of half reflector IRAs, and we calculated the radiated far field. We also provided a design for the lens that converts a coaxial Transverse Electromagnetic TEM mode to a spherical wave on the feed arms. Finally, we provided measurements of a ground plane model of a half reflector IRA. The results of this project have already been summarized in two Sensor and Simulation Notes and a Prototype IRA memo, so we only very briefly summarized their contents.
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