Input Impedance Calculation for TEM Horn Antennas
DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)
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A simple numerical technique is described for calculating the input impedance of ThM horn antennas for ultrawideband UWB applications. UWB antennas are required to radiate subnanosecond pulses with minimal distortion. The required bandwidth is from a few hundred megahertz up to 10 gigahertz. TEM horn antennas have emerged as potential candidates for directional UWB applications such as impulse radar. The input impedance of the horn is typically matched to the output impedance of the source. At the DSTO Wideband Test Facility, the antenna geometry has previously been varied empirically to produce the required input impedance due to the unreliability of alternative theoretical techniques based on conformal mapping which was not corrected until recently. This simple analysis circumvents this time consuming process and is readily implemented.
- Electrical and Electronic Equipment
- Active and Passive Radar Detection and Equipment