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Tapered notch antenna using coplanar waveguide
| Details |
Inventors: Schnetzer, Michel W.;
Assignee:
Primary Examiner: Hajec; Donald
Assistant Examiner: Le; Hoanganh
Attorney, Agent or Firm:
A radiating tapered notch antenna (sometimes known as a Vivaldi antenna) is fed by a section of slotline, which in, turn is fed by a coplanar waveguide. The transition from the unbalanced coplanar waveguide to the balanced slotline is accomplished by an infinite balun, where the center conductor of the coplanar waveguide terminates on the slotline conductor opposite the ground conductor of the coplanar waveguide. One slot of the coplanar waveguide becomes the feeding slotline for the notch, and the other slot terminates in a slotline open circuit. All of the elements of the system are coplanar. |
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DETAILED DESCRIPTION What is claimed is: 1.
The combination comprising: a broadband radiating tapered notch antenna, said antenna comprising a thin, flexible, non-self-supporting dielectric film, a conductive metallic layer coated on said film, the combination of said film with said layer thereon being rigidly self supporting, said layer being formed to define said tapered notch antenna, a section of slotline, a coplanar waveguide and an infinite balun, all of which are coplanar, radio frequencies being applied to said antenna through said slot line via said coplanar waveguide to the slotline being accomplished by said infinite balun.
2.
The combination as defined in claim 1 wherein said conductive metallic coating is copper, and wherein said film is a ceramic PTFE composite and the combination of said coating and said film is self-supporting.
Description:
This invention is for a radiating tapered notch antenna which is entirely coplanar.
The invention finds particular utility as the radiating elements in a very large (400 to 1200 m2) wide-band (40 percent) L-band corporate fed Space Based Radar, and more particularly in a deployable phased array antenna in which the subarrays of the antenna are compressed together in a stowed configuration.
The use of the tapered notch antenna using a coplanar waveguide feed, and having no ground plane provides an efficient antenna system capable of compact storage prior to deployment.
Because of the use of the radiators disclosed herein, it is feasible to provide a deployed antenna which measures 86'.
times.
149' and contains over.
73,000 radiating elements in a space measuring only 8.
5'.
times.
9.
4'.
times.
27' and therefore capable of being loaded into the current space shuttles.
BACKGROUND OF THE INVENTION The Vivaldi tapered notch, or horn, is printed on films of Kapton or other very thin dielectric.
Printing is accomplished by standard printed circuit techniques whereby the Kapton material is coated with copper or other conductor.
The horn and the feed network, including waveguides and impedance matching slot line baluns are produced by photo-etching
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Radio 
