A High-Voltage Cable-Fed Impulse Radiating Antenna
We describe here a high-voltage cable-fed Impulse Radiating Antenna (IRA) that was developed as part of an Ultra-Wideband (UWB) radar system using a single antenna and a directional coupler . In this configuration, it is not possible to use a sharpening switch at the apex to handle high voltages, so we investigated using higher voltages on a standard IRA with splitter balun. The resulting antenna, referred to as the IRA-6, was built and tested at three different voltage levels. Note that a more complete version of this paper appeared in 
This antenna is intended to be operated with a pulser with 30 kV peak voltage, 150 ps risetime, 3 ns pulse duration (at 1/e of peak), and 1 kHz maximum pulse repetition frequency (PRF) (manufacturer’s specs.). To prevent flashover at this voltage level, we incorporated a number of compromises into the antenna design at the splitter and feed point (focus), which led to somewhat larger reflections in the TDR than we are accustomed to seeing. These compromises also led to reduced realized gain, especially at higher frequencies. Nevertheless, the IRA-6 performed quite well as high as 4 GHz, which met the requirements for the radar system under study.
KeywordsGround Plane Directional Coupler Cable Length Center Conductor Feed Point
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