Summary
International Symposium on Antennas and Propagation
2006
Session Number:1D2a
Session:
Number:1D2a-2
Numerical Analysis of Impulse-Radiating Antennas with Ellipsoidal Reflectors
Kangwook Kim, Waymond R. Scott Jr, Sang Wook Lee, Moongu Jeon,
pp.1-6
Publication Date:2006/11/2
Online ISSN:2188-5079
Summary:
An impulse-radiating antenna (IRA) can effectively focus its radiation in the near field by using an ellipsoidal reflector. In this paper, three IRAs with ellipsoidal reflectors (elliptic IRAs) are numerically analyzed and compared with an IRA with a typical parabolic reflector (parabolic IRA). The ellipsoidal reflector is parameterized by the distance between the center of the reflector and its closest focus (F), the distance between the two optical foci (Φ), and the diameter of the reflector (D). The IRAs have the same F/D, i.e., 0.5, but different Φ/D’s, i.e., 0.5, 1.0, and 1.5. The electric fields in the near-field region and the reflected voltage in the feeding transmission line are analyzed. The elliptic IRAs have a larger impulse and a smaller beam in the near-field region than does the parabolic IRA. The maximum impulse amplitude and the minimum beam width do not occur at the optical focus for the input pulse considered in this paper. The amplitudes of the tail waveform and the reflected voltage in the transmission line are increased.