Accession Number : ADA327643

Title :   Design Considerations for a Half Impulse Radiating Antenna.

Descriptive Note : Final rept. Mar 95-Jan 96,

Corporate Author : FARR RESEARCH ALBUQUERQUE NM

Personal Author(s) : Farr, Everett G.

PDF Url : ADA327643

Report Date : JAN 1996

Pagination or Media Count : 16

Abstract : 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.

Descriptors :   *ANTENNAS, SIMULATION, GROUND LEVEL, COMPUTATIONS, DETECTORS, REPETITION RATE, MODELS, WAVEGUIDES, FAR FIELD, COAXIAL CONFIGURATIONS, FLOW FIELDS, PULSES, ELECTROMAGNETIC RADIATION, GEOMETRY, WIDTH, FEEDING, REFLECTORS, HIGH VOLTAGE, CONVERTERS.

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE