Planar microstrip antenna for motor-vehicle system

(19)

(11)

EP 1 108 616 A3

(12)	EUROPEAN PATENT APPLICATION

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

(43)	Date of publication A2:
	20.06.2001 Bulletin 2001/25

(21)	Application number: 00125605.6

(22)	Date of filing: 22.11.2000

(51)	International Patent Classification (IPC)⁷: B60R 11/02, H01Q 21/06

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

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Priority:

13.12.1999 IT RE990059

(71)	Applicant: ASK INDUSTRIES S.p.A.
	42100 Reggio Emilia (IT)

(72)	Inventors:
	Biffi Gentili, Guido 42020 Montecavolo di Quattro Castella (IT) Mantovani, Pietro 42020 Montecavolo di Quattro Castella (IT)

(74)	Representative: Lecce, Giovanni
	Dott. Giovanni Lecce & C. S.r.l. Via Fratelli Ruffini, 9 20123 Milano 20123 Milano (IT)

(54)	Planar microstrip antenna for motor-vehicle system

(57) A planar microstrip antenna suitable for motor-vehicle systems operating in dual-band resonance frequency. it comprises a radiant element (1), a mass plane (2) parallel to said radiant element (1), a shorting lead (3) that connects said radiant element to said mass plane, and feeding means fixed to a coaxial cable (8). Said radiant element (1) has a configuration proportioned for a first resonance frequency, and is provided with at least a slot (6) located in proximity with and parallel to its edge (5). Said slot has a proportional extension according to the resonance frequency desired.

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