Dual-window high-power conical horn antenna

• US 6,211,837 B1
• Filed: 03/10/1999
• Issued: 04/03/2001
• Est. Priority Date: 03/10/1999
• Status: Expired due to Term

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Raytheon Company (Rtx Corporation)
• Inventors: Dolash, William E., Crouch, David D.
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Clinger, James
• Application Number:
  US09/265,643
• Time in Patent Office: 755 Days
• Field of Search: 343/786, 343/909, 343/911 R, 343/785, 343/772, 343/753
• US Class Current: 343/786
• CPC Class Codes: H01Q 1/42 Housings not intimately mechanically associated with radiating elements, e.g. radome
• CPC Class Codes: H01Q 1/422 comprising two or more layers of dielectric material H01Q1/425 takes precedence
• CPC Class Codes: H01Q 13/02 Waveguide horns

Abstract

A high power TM₀₁ mode radio frequency antenna. The inventive antenna comprises a conical horn for receiving an electromagnetic input signal and radiating an output signal in response thereto. An inner window is disposed within the conical horn. An outer window is mounted at an output aperture of the conical horn in alignment with the inner window. The antenna has a gradual taper from a waveguide input to the aperture over a cone angle of 45 degrees. The outer window is mounted at the aperture in concentric alignment with the inner window. For an optimal compact design, the inner and outer windows are of polycarbonate construction.

Claims

1. A high power antenna comprising:

a conical horn for receiving an electromagnetic input signal and radiating an output signal in response thereto said conical horn having an waveguide input, an output aperture, and a gradual taper from said waveguide input to said aperture, said taper being tangential to said waveguide input on one end and tangential to said output aperture on the other end thereof;

an inner window disposed within said conical horn; and

an outer window mounted at the aperture of said conical horn.

2. The invention of claim 1 wherein said antenna is a TM₀₁ mode antenna.

3. The invention of claim 1 including an input flange mounted at said waveguide input of said horn.

4. The invention of claim 3 wherein said horn has a cone angle of 45 degrees.

5. The invention of claim 3 wherein said outer window is disposed at said aperture of said horn.

6. The invention of claim 1 wherein said inner window is a polycarbonate.

7. The invention of claim 6 wherein said outer window is polycarbonate.

8. The invention of claim 1 wherein said inner window has a bore therethrough.

9. A high power TM₀₁ mode antenna comprising:

a conical horn having a waveguide input for receiving an electromagnetic input signal and an aperture for radiating an output signal in response thereto, said horn having a gradual taper from said waveguide input to said aperture, said taper having a radius R given by;

$R=\frac{b<br><br>\text{\hspace{1em}<br><br>}<br><br>\cos <br><br>\text{\hspace{1em}<br><br>}<br><br>{\mathrm{\theta <br><br>}}_c-\mathrm{\delta <br><br>}<br><br>\text{\hspace{1em}<br><br>}<br><br>\sin <br><br>\text{\hspace{1em}<br><br>}<br><br>{\mathrm{\theta <br><br>}}_c}{1-\cos <br><br>\text{\hspace{1em}<br><br>}<br><br>{\mathrm{\theta <br><br>}}_c}$

 

where b is an inner radius of said waveguide input, θ

_c is an angle between an axis of the horn and the side wall of the horn, and δ

is a distance between a projected apex of the horn and a start of a transition section with a height H given by;

10. The invention of claim 9 wherein said horn has a cone angle of 45 degrees.

11. The invention of claim 9 wherein said inner window is a polycarbonate.

12. The invention of claim 11 wherein said outer window is polycarbonate.

13. The invention of claim 9 wherein said inner window has a bore therethrough.