(19)

(11)

EP 1 131 856 A1

(12)

(43) Date of publication: 12.09.2001 Bulletin 2001/37 (21) Application number: 99954242.6 (22) Date of filing: 12.11.1999

(51) International Patent Classification (IPC)7: H01Q 3/44, H01Q 19/10 (86) International application number: PCT/GB9903/782 (87) International publication number: WO 0030/212 (25.05.2000 Gazette 2000/21)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 12.11.1998 GB 9824800 02.07.1999 GB 9915359 (71) Applicant: BAE Systems Electronics Ltd. Stanmore,Middlesex HA7 4LY (GB)	(72) Inventor: KUMAR, Balbir London HA0 3AU (GB) (74) Representative: MacLean, Martin David  BAE Systems plc,Group IP Dept.,Lancaster HousePO Box 87Farnborough Aeropace Centre Farnborough,Hampshire GU14 6YU Farnborough,Hampshire GU14 6YU (GB)