Multi-octave thick dielectric radome wall

• US 4,725,475 A
• Filed: 08/25/1986
• Issued: 02/16/1988
• Est. Priority Date: 08/25/1986
• Status: Expired due to Term

• Current Assignee: BAE SYSTEMS Mission Solutions, Inc. (BAE Systems Plc)
• Original Assignee: General Dynamics Corporation
• Inventors: Fiscus, Thomas E., Tricoles, Gus P.
• Primary Examiner(s): Morgenstern, Norman
• Assistant Examiner(s): Burke, Margaret A.
• Application Number:
  US06/900,089
• Time in Patent Office: 540 Days
• Field of Search: 343/705, 343/872, 343/873, 343/878, 343/886, 343/887, 343/907, 343/908, 343/911 R, 343/912, 343/771, 428/116, 428/117, 428/118, 428/141, 428/156, 428/158, 428/159, 428/166, 428/170, 428/172, 428/304.4, 428/309.9, 428/314.2, 428/318.4, 428/319.3, 428/319.7 , 428/35, 428/36, 244/119, 244/117 R, 244/121, 52/80, 52/791, 52/792, 52/785
• US Class Current: 428/156
• CPC Class Codes: H01Q 1/422 comprising two or more layers of dielectric material H01Q1/425 takes precedence
• CPC Class Codes: Y10T 428/24149 Honeycomb-like
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24562 Interlaminar spaces
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/24996 With internal element bridging layers, nonplanar interface between layers, or intermediate layer of commingled adjacent foam layers
• CPC Class Codes: Y10T 428/249987 With nonvoid component of specified composition
• CPC Class Codes: Y10T 428/249991 Synthetic resin or natural rubbers
• CPC Class Codes: Y10T 428/249992 Linear or thermoplastic

Abstract

A multi-octave thick dielectric radome wall which includes a dielectric slab having a pair of surfaces and a plurality of pyramidal-shaped dielectric elements mounted on at least one of the surfaces of the dielectric slab. The dielectric constant of the elements is typically greater than the dielectric constant of the slab. In an alternate embodiment, a second dielectric slab is provided adjacent to one of the first dielectric slab surfaces having the elements mounted thereupon with support means for supporting the second dielectric slab in a spaced apart relationship with the first dielectric slab.

Claims

1. A multi-octave thick dielectric radome wall comprising:

a dielectric slab having a pair of surfaces and a predetermined dielectric constant;

a plurality of pyramidal-shaped dielectric elements, each having a predetermined dielectric constant and a base and a surface extending from said base terminated at a common vertex opposite said base, each element base mounted on at least one of said slab surfaces with said elements positioned adjacent one another; and

wherein the distance between said slab surfaces and the distance between each element base and respective common vertex is a function of said dielectric constants of said slab and said elements and an operational frequency band of said radome wall.

2. The radome wall of claim 1 wherein the dielectric constants of said slab and said elements are equal.

3. The radome wall of claim 1 wherein the dielectric constant of said elements is greater than the dielectric constant of said slab such that the ratio of the square root of the dielectric constant of said elements to the square root of the dielectric constant of said slab is approximately 10 to 1.

4. The radome wall of claim 1 wherein each pyramidal-shaped dielectric element has a plurality of faces, said faces being triangularly-shaped and sharing said common vertex opposite said base with said common vertex being intersected by an axis extending through said base at a predetermined angle from a second axis extending through the center of said base perpendicular to one of said surfaces.

5. The radome wall of claim 1 wherein each pyramidal-shaped dielectric element has a surface of rotation, said surface of rotation being symmetrical about an axis of rotation with said axis of rotation extending at a predetermined angle from a second axis which is perpendicular to the center of said base.

6. The radome wall of claim 1 further comprising:

a second dielectric slab positioned adjacent to one of said dielectric slab surfaces having said elements mounted thereupon; and

support means for supporting said second dielectric slab in spaced apart relationship with said dielectric slab.

7. The radome of claim 6 wherein said support means comprises a honeycomb-type wall structure defining individual cells wherein a respective element is contained.

8. The radome of claim 6 wherein said dielectric slab and said second dielectric slab are substantially parallel.

9. A multi-octave thick dielectric radome wall comprising:

a dielectric slab having a pair of opposed surfaces and a predetermined dielectric constant;

a plurality of pyramidal-shaped dielectric elements, each having a predetermined dielectric constant, each of said elements having a base and a surface extending from said base terminated at a common vertex opposite said base, each element base mounted on at least one of said slab surfaces with said elements positioned adjacent one another;

wherein the dielectric constant of said elements is greater than the dielectric constant of said slab and the distance between said slab surfaces and the distance between each element base and respective common vertex is a function of said dielectric constants of said slab and said elements and an operational frequency band of said radome wall.

10. The radome wall of claim 9 wherein each pyramidal-shaped dielectric element has a base for mounting upon one of said slab surfaces and said element surface has a plurality of faces, said faces being triangularly-shaped and sharing said common vertex opposite said base with said common vertex being intersected by an axis extending through said base at a predetermined angle from a second axis extending through the center of said base perpendicular to one of said surfaces.

11. The radome wall of claim 9 wherein each pyramidal-shaped dielectric element has a base for mounting upon one of said slab surfaces and said element surface is a surface of rotation, said surface of rotation being symmetrical about an axis of rotation with said axis of rotation extending at a predetermined angle from a second axis perpendicular to the center of said base.

12. The radome wall of claim 10 further comprising;

a second dielectric slab positioned adjacent to one of said dielectric slab surfaces having said elements mounted thereupon; and

support means for supporting said second dielectric slab in spaced apart relationship with said dielectric slab.

13. The radome wall of claim 12 wherein said support means comprises a honeycomb-type wall structure defining individual cells wherein a respective element is contained.

14. The radome wall of claim 13 wherein said predetermined angle is in the range of 0 to 70 degrees.

15. The radome wall of claim 10 wherein the ratio of the height of an element to the distance across the element base is approximately 3 to 1.

16. The radome wall of claim 11 further comprising:

a second dielectric slab positioned adjacent to one of said dielectric slab surfaces having said elements mounted thereupon; and

support means for supporting said second dielectric slab in spaced apart relationship with said dielectric slab.

17. The radome of claim 16 wherein said support means comprises a honeycomb-type wall structure defining individual cells wherein a respective element is contained.

18. The radome wall of claim 17 wherein said predetermined angle is in the range of 0 to 70 degrees.

19. The radome wall of claim 11 wherein the ratio of the height of an element to the distance across the element base is approximately 3 to 1.