(19)

(11)

EP 0 480 917 A1

(12)

(43) Date of publication: 22.04.1992 Bulletin 1992/17 (21) Application number: 89902802.0 (22) Date of filing: 17.02.1989

(51) International Patent Classification (IPC):  H01Q 9/ 04( . ) H01Q 19/ 06( . ) H01Q 15/ 23( . ) (86) International application number: PCT/GB1989/000172 (87) International publication number: WO 1989/008932 (21.09.1989 Gazette 1989/23)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 23.02.1988 GB 19880004175 (71) Applicant: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and London SW1A 2HB (GB)	(72) Inventor: RIX, Clifford Rowner Gosport Hampshire (GB) (74) Representative: Beckham, Robert William  Defence Evaluation and Research Agency Intellectual Property Department R69 Building DERA Farnborough Farnborough, Hants. GU14 6TD Farnborough, Hants. GU14 6TD (GB)