A method and a device for reducing interference

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(11)

EP 0 973 280 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	03.12.2003 Bulletin 2003/49

(43)	Date of publication A2:
	19.01.2000 Bulletin 2000/03

(21)	Application number: 99112461.1

(22)	Date of filing: 30.06.1999

(51)	International Patent Classification (IPC)⁷: H04B 15/00, H01Q 1/24, H04B 1/12, H04B 1/38

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

14.07.1998 FI 981604

(71)	Applicant: Nokia Corporation
	02150 Espoo (FI)

(72)	Inventors:
	Olli-Pekka, Lunden 36120 Suinula (FI) Olli, Talvitie 33230 Tampere (FI) Urpo, Nokkonen 33720 Tampere (FI)

(74)	Representative: Simmelvuo, Markku et al
	Papula Oy, Patent Agency Papula P.O. Box 981 00101 Helsinki 00101 Helsinki (FI)

(54)	A method and a device for reducing interference

(57) The balancing of the antenna (AER2) of a mobile station card and an antenna interface (LNA) interrupts the access of interference (E) formed in the chassis of the electronic device acting as the host of the mobile station card through the antenna interface to disturb the radio reception of the mobile station card. The antenna has two elements that are placed to receive the interference emitted by a computer in a symmetric way. The antenna interface is balanced using a balun (Ba) or a differential antenna amplifier.

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