(19)
(11) EP 0 310 414 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.04.1990 Bulletin 1990/17

(43) Date of publication A2:
05.04.1989 Bulletin 1989/14

(21) Application number: 88309094.6

(22) Date of filing: 30.09.1988
(51) International Patent Classification (IPC)4: H01Q 15/24, H01Q 17/00, H01Q 19/06, H01Q 1/42
(84) Designated Contracting States:
DE FR GB

(30) Priority: 02.10.1987 US 103778

(71) Applicant: RAYTHEON COMPANY
Lexington Massachusetts 02173 (US)

(72) Inventor:
  • Smith, Keith C.
    Santa Barbara California 93109 (US)

(74) Representative: Jackson, David Spence et al
REDDIE & GROSE 16, Theobalds Road
London, WC1X 8PL
London, WC1X 8PL (GB)


(56) References cited: : 
   
       


    (54) Lens/polarizer/radome


    (57) To modify the antenna pattern of an existing array antenna (12), a unitary assembly made up of a dielectric lens (13) of appropriate shape, a horizontal polarization filter (17), a circular polarizer (19) and absorbing material (21,23,24) are disposed to cover the aperture of the existing array antenna (12). A quarter-­wave matching element (15) is provided on the transmission faces of the lens (13). The circular polarizer (19) is made of five layers of dielectric material, each layer being provided with a directional pattern of metallic meander lines (19a, 19b, 19c, 19d, 19e).







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