Communications: directive radio wave systems and devices (e.g. – Radio wave absorber
Patent
1995-10-27
1997-02-04
Nelson, Peter A.
Communications: directive radio wave systems and devices (e.g.,
Radio wave absorber
342 2, 342 3, 427501, 427505, 427160, H01Q 1700, H01Q 704
Patent
active
H00016314
ABSTRACT:
The present invention is a method for making radar chaff consisting of metal rings having varying diameters, using photolithographic processes. One aspect of the invention has the steps of: providing a metal foil having a thickness suitable for use in radar chaff; overcoating the metal foil with a photoresist, to form a layered structure; undercoating the metal foil with a removable backing; exposing the photoresist to a quantity of actinic radiation for chemically modifying the photoresist into a photoproduct suitable for subsequent development, where the actinic radiation is patterned into a series of concentric rings; developing the photoresist, to expose the underlying metal in a series of concentric rings; removing the exposed metal to form a series of concentric metal rings on the removable backing; and removing the removable backing. Another aspect of the invention is a metal chaff precursor, comprising: a removable backing, coated with a plurality of concentric metal foil rings.
Ayers Jack D.
Cowart Gregory
Montgomery John A.
Karasek John J.
McDonnell Thomas E.
Nelson Peter A.
United States of America
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