(19)

(11)

EP 0 291 517 A1

(12)

(43) Date of publication: 23.11.1988 Bulletin 1988/47 (21) Application number: 87907012.0 (22) Date of filing: 26.10.1987

(51) International Patent Classification (IPC):  H01Q 3/ 26( . ) (86) International application number: PCT/GB1987/000755 (87) International publication number: WO 1988/003333 (05.05.1988 Gazette 1988/10)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (30) Priority: 24.10.1986 GB 19860025488 (71) Applicant: THE MARCONI COMPANY LIMITED Stanmore Middlesex HA7 4LY (GB)	(72) Inventor: BRENNAN, Paul, Victor Essex (GB) (74) Representative: Keppler, William Patrick  The General Electric Company, p.l.c. GEC Patent Department Waterhouse Lane Chelmsford, Essex CM1 2QX Chelmsford, Essex CM1 2QX (GB)