Vehicular slot antenna system
First Claim
1. In combination with an automotive vehicle (10) having a vehicle body (11),a vehicular antenna system comprising a central feed point (28) for radiating or receiving signals,said antenna system further comprisingthree slot antenna units (12, 13, 13a, 14), one (13, 13a) being located at a forward portion of the vehicle, a second one (14) at a rearward portion of the vehicle, and the third one (12) at an intermediate portion of the vehicle;
- antenna connection cable means (25, 26, 26a,
27) coupling the respective slot antenna units to the central feed point (28) for together connecting said signals radiated or received from the at least two slot antenna units to said feed point; and
wherein each of said antenna connection cable means has a length ofn·
λ
/2,wherein λ
is the wave length of the center frequency of the radiation band coupled by the antenna system, andn is a whole integer;
and wherein each one of said slot antenna units comprises an essentially planar conductive portion (15,
21) of essentially rectangular shape, with a non-conductive slot extending longitudinally of said conductive portion and symmetrically therein, and wherein said planar conductive portions of the first and second antenna units are positioned essentially transversely to a longitudinal axis of the vehicle and the third antenna unit is located essentially parallel to said longitudinal axis.
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Accused Products
Abstract
To provide for ominidirectional reception/transmission of slot antennas installed on a vehicle, a plurality of slot antenna units (12, 13, 13a, 14) are installed on the vehicle, facing, for example, forwardly, rearwardly and laterally of the vehicle. Each of the slot antenna units is connected to a common feed point (28) which is coupled to a radio equipment, which may be a transmitter or receiver, by a connecting cable which has a length of n.λ/2, wherein n is a whole integer and λ is the average operating wave length for which the antenna is designed. For about 500 MHz, an antenna length of about 55 cm with a slot length of 35 cm and a width of about 7 mm is suitable. The antenna can be formed in U shape and function as a license plate holder for, for example, a license plate made of insulating material. The antenna units are insulated from the body of the vehicle.
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Citations
15 Claims
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1. In combination with an automotive vehicle (10) having a vehicle body (11),
a vehicular antenna system comprising a central feed point (28) for radiating or receiving signals, said antenna system further comprising three slot antenna units (12, 13, 13a, 14), one (13, 13a) being located at a forward portion of the vehicle, a second one (14) at a rearward portion of the vehicle, and the third one (12) at an intermediate portion of the vehicle; -
antenna connection cable means (25, 26, 26a,
27) coupling the respective slot antenna units to the central feed point (28) for together connecting said signals radiated or received from the at least two slot antenna units to said feed point; andwherein each of said antenna connection cable means has a length of n·
λ
/2,wherein λ
is the wave length of the center frequency of the radiation band coupled by the antenna system, andn is a whole integer; and wherein each one of said slot antenna units comprises an essentially planar conductive portion (15,
21) of essentially rectangular shape, with a non-conductive slot extending longitudinally of said conductive portion and symmetrically therein, and wherein said planar conductive portions of the first and second antenna units are positioned essentially transversely to a longitudinal axis of the vehicle and the third antenna unit is located essentially parallel to said longitudinal axis. - View Dependent Claims (2, 3, 4, 5, 6)
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7. In combination with an automotive vehicle (10) having a vehicle body (11),
a vehicular antenna system comprising a central feed point (28) for radiating or receiving signals, said antenna system further comprising two slot antenna units (12, 13, 13a, 14) located on said body, and insulated from said body, each of said antenna units radiating or receiving said signals; - and
antenna connection cable means (25, 26, 26a,
27) coupling the respective slot antenna units to the central feed point (28) for together connecting said signals radiated or received from the two slot antenna units to said feed point; andwherein each of said antenna connection cable means has a length of n·
λ
/2,wherein λ
is the wave length of the center frequency of the radiation band coupled by the antenna system, andn is a whole integer; wherein a first one of the antenna units is located at an extreme portion of the vehicle and a second one of the antenna units is located at an intermediate portion of the vehicle; said slot antenna units comprise a conductive portion (21) of essentially rectangular shape, with a non-conductive slot extending longitudinally of said conductive portion and symmetrically therein, and wherein the conductive portion of the first one of the slot antenna units is positioned essentially transversely to the longitudinal axis of the vehicle and the conductive portion of the second antenna unit is located essentially parallel to said longitudinal axis. - View Dependent Claims (8, 9, 10)
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11. In combination with an automotive vehicle (10) having a vehicle body (11),
a vehicular antenna system comprising a central feed point (28) for radiating or receiving signals, said antenna system further comprising at least two slot antenna units (12, 13, 13a, 14) located on said body, and insulated from said body, each of said antenna units radiating or receiving said signals; -
wherein one of said at least two slot antenna units is located at an angle with respect to, and spaced apart from, another one of the slot antenna units; and antenna connection cable means (25, 26, 26a,
27) are provided, coupling the respective slot antenna units to the central feed point (28) for together connecting said signals radiated or received from the at least two slot antenna units to said feed point; andwherein each of said antenna connection cable means has a length of n·
λ
/2,wherein λ
is the wave length of the center frequency of the radiation band coupled by the antenna system, andn is a whole integer; wherein three slot antenna units are provided, one being located at a forward portion of the vehicle, a second one at a rearward portion of the vehicle, and a third one at an intermediate portion of the vehicle; and wherein each one of said slot antenna units comprises an essentially planar conductive portion (15,
21) of essentially rectangular shape, with a non-conductive slot extending longitudinally of said conductive portion and symmetrically therein, and wherein said planar conductive portions of the first and second antenna units are positioned essentially transversely to a longitudinal axis of the vehicle and the third antenna unit is located essentially parallel to said longitudinal axis;and wherein at least one of said antenna units comprises a sheet metal element (20) formed in U or channel shape, and having a base portion (21), said base portion being formed with an elongated slot (22) therein. - View Dependent Claims (12, 13, 14, 15)
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Specification