Impulse Radiating Antennas, Part III
In this paper we continue our general discussion of Impulse Radiating Antennas (IRAs), which has been carried on during the first two Ultra-Wideband, Short-Pulse Electromagnetics conferences. IRAs are a class of antennas that consist of a TEM feed section and either a lens or reflector to focus the aperture field. We summarize here much of the more recent information, including new antenna designs, new calculation methods, and an optimization of the impedance of the lens IRA.
First, we explore a wide variety of new IRA designs that include two reflecting or refracting surfaces. By using two surfaces, one can achieve considerable additional flexibility in design. This flexibility allows very compact designs, and also allows additional choices of feed impedance.
Next, we consider the optimal feed impedance for long TEM horns and lens IRAs. We consider both TEM horns whose plates are flat, and whose plates are confined to a circular arc. We also consider both infinite apertures and circular apertures of finite radius. The optimal impedance is determined as the impedance that provides the highest radiated field for a given input power.
Finally, we calculate the field radiated from a four-wire aperture, both on- and off-boresight. This is an approximation to the aperture field of a four-armed reflector IRA.
KeywordsFlat Plate Step Response Power Gain Prolate Spheroid Circular Aperture
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