(19)

(11)

EP 0 409 941 A1

(12)

(43) Date of publication: 30.01.1991 Bulletin 1991/05 (21) Application number: 90902003.0 (22) Date of filing: 15.11.1989

(51) International Patent Classification (IPC):  H01Q 13/ 10( . ) H01Q 21/ 06( . ) H01Q 21/ 00( . ) (86) International application number: PCT/US1989/005076 (87) International publication number: WO 1990/007200 (28.06.1990 Gazette 1990/15)

(84) Designated Contracting States: CH DE FR IT LI NL SE (30) Priority: 19.12.1988 US 19880286415 (71) Applicant: HUGHES AIRCRAFT COMPANY Los Angeles, CA 90080-0028 (US)	(72) Inventors: RODRIGUEZ, Angel, E. Tucson, AZ 85713 (US) ALFING, Norman, L. Green Valley, AZ 95614 (US) (74) Representative: Colgan, Stephen James, et al  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)