Title :
Use of isorefractive media to improve prompt aperture efficiency in a lens IRA
Author :
Tyo, J.S. ; Buchenauer, C.J. ; Schoenberg, J.S.H.
Author_Institution :
Wideband Sources Group, USAF Res. Lab./DEHP, Kirtland AFB, NM, USA
fDate :
7/1/1998 12:00:00 AM
Abstract :
The concept of prompt aperture efficiency is introduced for impulse radiating antennas (IRA´s) and the efficiency is analyzed in detail for a specific class of lens IRA´s. By using two isorefractive media, one with a low impedance within the aperture of the IRA and one with a high impedance outside the aperture, the power on the TEM transmission line-feed structure of the IRA can be concentrated within the aperture, thereby improving the prompt aperture efficiency beyond what is possible using a single medium
Keywords :
antenna theory; aperture antennas; electric impedance; horn antennas; lens antennas; TEM transmission line-feed structure; horn antenna; impedance; impulse radiating antennas; isorefractive media; lens antennas; prompt aperture efficiency; Antenna accessories; Aperture antennas; Electrodes; Feeds; Horn antennas; Impedance; Lenses; Optical propagation; Polarization; Power transmission lines;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
