Omnidirectional electromagnetic lens

• US 4,682,179 A
• Filed: 05/03/1985
• Issued: 07/21/1987
• Est. Priority Date: 05/03/1985
• Status: Expired due to Fees

• Current Assignee: The United States of America As Represented By The Secretary of Agriculture
• Original Assignee: The United States Of America As Represented By The Secretary Of The Army
• Inventors: Gerharz, Reinhold
• Primary Examiner(s): Nussbaum, Marvin L.
• Application Number:
  US06/730,013
• Time in Patent Office: 809 Days
• Field of Search: 343/754, 343/755, 343/909, 343/910, 343/911 R, 343/911 L, 343/753, 343/773, 343/786, 350/1.1, 350/1.6, 350/1.7, 350/101, 350/103, 350/104, 350/106, 350/109, 350/162.11, 350/162.12, 350/409, 350/413, 350/416, 350/442, 350/444, 350/482, 350/483, 250/347, 250/353
• US Class Current: 343/755
• CPC Class Codes: H01Q 15/23 Combinations of reflecting surfaces with refracting or diffracting devices
• CPC Class Codes: H01Q 19/06 using refracting or diffracting devices, e.g. lens radome H01Q1/42
• CPC Class Codes: H01Q 19/102 wherein the surfaces are of convex toroïdal shape biconical horns H01Q13/04

Abstract

An electromagnetic lens formed of a refractive material with a reflective rface. The lens is a body of revolution having an upper parabolic reflective surface and spherical side and bottom surfaces. Incoming radiation is refracted at one spherical surface, reflects from the reflective surface, exits and is refracted at the other spherical surface. The radiation may be directed onto an array of electromagnetic detectors. Such an array may consist of concentric circles of detectors, such that a particular detector is illuminated by incoming radiation of a particular azimuth and elevation.

Claims

1. An omnidirectional electromagnetic lens with a body of revolution about an axis of revolution and formed from a material transparent and refractive to electromagnetic waves and having three curved surfaces:

a top reflective surface and transparent side and bottom surfaces, whereby said top surface is a segment of a paraboloid with an axis colinear to said axis of revolution, and said side and bottom surfaces are segments of spheres with their centers on said axis of revolution.