Slot chevron element for periodic antennas and radomes

• US 4,287,520 A
• Filed: 11/09/1979
• Issued: 09/01/1981
• Est. Priority Date: 11/09/1979
• Status: Expired due to Term

• Current Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Original Assignee: United States Of America As Represented By The Secretary Of The Air Force
• Inventors: Bushelle, William R., Van Vliet, Robert M.
• Primary Examiner(s): Moore, David K.
• Application Number:
  US06/092,817
• Time in Patent Office: 662 Days
• Field of Search: 343/754, 343/767, 343/770, 343/771, 343/909, 343/872, 343/18 A, 343/18 B
• US Class Current: 343/909
• CPC Class Codes: H01Q 1/425 comprising a metallic grid
• CPC Class Codes: H01Q 15/0013 said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective

Abstract

A periodic array for use as an electromagnetic energy resonant array or reflector having a high density pattern formed from individual chevron shaped elements. Various interlocked and interlaced patterns of elements provide the array designer with more flexibility in controlling bandwidth and stabilizing the functional relationship between frequency and the angle incidence with the electromagnetic energy. Furthermore, structural patterns of chevron shaped elements readily incorporate structural paths for lightning conduction and mechanical support without severely altering the electrical performance.

Claims

1. A metallic radome, comprising:

a. a curved surface of thin metallic material;

b. a plurality of chevron-shaped slots in said curved surface;

c. said chevron-shaped slots being formed of two linear slot elements connected end-to-end at an angle of substantially 90°

;

d. said chevron-shaped slots being uniformly distributed on said curved surface in a closely spaced pattern with adjacent linear slot elements parallel to each other.

2. The device of claim 1, wherein said chevron-shaped slots are spaced on said curved surface so as to provide at least one uninterrupted substantially straight line conductive pathway along said curved surface.

3. The device of claim 1 further including a dielectric layer contiguous to said curved surface, said dielectric layer having means dispersed therein for capacitively loading said chevron-shaped slots.

4. The device of claim 3 wherein said means dispersed in the dielectric layer for capacitively loading said chevron-shaped slots is a fine metallic powder made of aluminum.