Duplexer and communication apparatus

(19)

(11)

EP 0 980 109 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	08.08.2001 Bulletin 2001/32

(43)	Date of publication A2:
	16.02.2000 Bulletin 2000/07

(21)	Application number: 99115533.4

(22)	Date of filing: 05.08.1999

(51)	International Patent Classification (IPC)⁷: H01P 1/15, H01P 1/213, H01P 1/202

(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

(30)

Priority:

11.08.1998 JP 22704698

(71)	Applicant: Murata Manufacturing Co., Ltd.
	Nagaokakyo-shi Kyoto-fu 617-8555 (JP)

(72)	Inventor:
	Atokawa, Masayuki, c/o (A170) Intellect.Prop.Dep. Nagaokakyo-shi, Kyoto-fu 617-8555 (JP)

(74)	Representative: Schoppe, Fritz, Dipl.-Ing.
	Schoppe, Zimmermann & Stöckeler Patentanwälte Postfach 71 08 67 81458 München 81458 München (DE)

(54)	Duplexer and communication apparatus

(57) The invention provides a duplexer (31), comprising: a first frequency variable type filter (45) including a voltage-controllable reactance element (D1, D2, D3 D4) and operative to switch transmitting - receiving frequencies corresponding to a first communication system (GSM); a second frequency variable type filter (46) including a voltage-controllable reactance element (D5, D6, D7, D8) and operative to switch transmitting - receiving frequencies corresponding to a second communication system (DCS); a synthetic circuit (47) electrically connected between one end of said first frequency variable type filter (45) and one end of said second frequency variable type filter (46); an antenna terminal (ANT) electrically connected to said synthetic circuit (47); a first external terminal (P1) electrically connected to the other end of said first frequency variable type filter (45); and a second external terminal (P2) electrically connected to the other end of said second frequency variable type filter (46).

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