Coplanar Conical Plates in a Uniform Dielectric Lens with Matching Conical Plates for Feeding a Paraboloidal Reflector

  • Carl E. Baum
  • Joseph J. Sadler
  • Alexander P. Stone


One form of an impulse radiating antenna (IRA) consists of a paraboloidal reflector fed by conical transmission lines that propagate a spherical TEM wave, which originates from the focal point of the reflector. A diagram which depicts such an IRA is shown schematically in Figure 1. The design considerations of a uniform dielectric lens useful in launching a spherical TEM wave onto such a paraboloidal reflector have been investigated in earlier work1, 2, 3, and the geometrical parameters for the lens design are indicated in Figure 2. The lens design in essence consists of specifying certain parameters. These include the cylindrical radius, h, of the outermost ray which intercepts the reflector, the relative permittivity ε r of the lens medium, and the angle, θ r (out), from the apex of the conical transmission line (focal point) to the edge of the reflector. This angle is determined by the reflector geometry through the ratio F/D, where F is the focal distance from the center of the reflector and D is the reflector diameter. We also need to specify the angle θ r (in) made by the line inside the lens with respect to the directions of launch.


Characteristic Impedance Spherical Wave Reflector Geometry Lens Design Lens Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    C. E. Baum, J. J. Sadler, and A. P. Stone, A uniform dielectric lens for launching a spherical wave into a paraboloidal reflector, Sensor and Simulation Note 360, (July 1993).Google Scholar
  2. 2.
    E. G. Farr and C. E. Baum, Prepulse associated with the TEM feed of an impulse radiating antenna, Sensor and Simulation Note 337, (March 1992).Google Scholar
  3. 3.
    D. V. Giri, Design considerations of a uniform dielectric lens for launching a spherical TEM wave on the the protype IRA, Protype IRA Memos, Memo 3, (May 1994).Google Scholar
  4. 4.
    C. E. Baum, J. J. Sadler, and A. P. Stone, Uniform isotropic dielectric equal-time lenses for matching combinations of plane and spherical waves, Sensor and Simulation Note 352, (December 1992).Google Scholar
  5. 5.
    M. Abramowitz and I. A. Stegun, Handbook of mathematical functions, in: National Bureau of Standards, AMS-55, Chapters 16 and 17, (June 1964).Google Scholar

Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • Carl E. Baum
    • 1
  • Joseph J. Sadler
    • 1
  • Alexander P. Stone
    • 2
  1. 1.Phillips LaboratoryPL/WSR, KAFBAlbuquerqueUSA
  2. 2.Department of Mathematics and StatisticsUniversity of New MexicoAlbuquerqueUSA

Personalised recommendations