Frequency selective surface devices

(19)

(11)

EP 0 711 001 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	16.07.1997 Bulletin 1997/29

(43)	Date of publication A2:
	08.05.1996 Bulletin 1996/19

(21)	Application number: 95306717.0

(22)	Date of filing: 22.09.1995

(51)	International Patent Classification (IPC)⁶: H01Q 15/00

(84)	Designated Contracting States:
	DE FR GB IT

(30)

Priority:

04.11.1994 GB 9422278

(71)	Applicant: MMS SPACE SYSTEMS LIMITED
	Stanmore, Middlesex HA7 4LY (GB)

(72)	Inventor:
	Cahill, Robert Chepstow, Gwent, NP6 5LY (GB)

(74)	Representative: Waters, Jeffrey
	The General Electric Company, p.l.c. GEC Patent Department Waterhouse Lane Chelmsford, Essex CM1 2QX Chelmsford, Essex CM1 2QX (GB)

(54)	Frequency selective surface devices

(57) A frequency selective surface device separates or combines two channels by using two or three spaced layers of resonant elements such as loops 14 which are coupled and which have interactive effects between the layers such that the relatively broad transmission and reflection bands characteristic of the resonant elements are modified by reinforcement of multiple reflections between the layers in the manner of a Fabry-Perot etalon in order to increase the sharpness of the transition of the transmission and reflection bands and thereby to permit combination or separation of closely spaced channels.

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