Vehicle antenna and diversity receiver
An antenna and vehicle technology, which is applied in the direction of antenna support/mounting device, antenna, antenna parts, etc., can solve the problems of reception quality degradation and deterioration of reception quality, so as to improve reception performance, improve reception quality, and prevent reception quality from deteriorating Effect
Inactive Publication Date: 2004-07-14
FUJITSU GENERAL LTD
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Problems solved by technology
However, at this time, since the power supply coaxial cable from the antenna to the amplifier becomes longer, the cable loss causes deterioration of the S / N ratio which is the signal-to-noise ratio (signal-to-noise ratio) of the high-frequency reception signal, thereby deteriorating the reception quality
In addition, if the length of the coaxial cable is extended, especially if the impedance of the coaxial cable does not match the impedance of the feed point of the antenna, noise generated from the vehicle is induced on the coaxial cable for power supply. ), the reception quality deteriorates due to the induction of noise generated from the vehicle in the coaxial cable for power supply
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[0046] figure 1 A schematic circuit configuration of a vehicle antenna 1 according to an embodiment of the present invention is shown. In this embodiment, two film antennas 2 and 3 are attached to the inner surface of a windshield 4 of an automobile. The sticking position of the film antennas 2 and 3 is on the upper part of the windshield 4, between the rearview mirror 5 and the pillar parts (pillar parts) 6 and 7 on both sides. The antenna element actually used for reception is selected by a selector 8 . The selection of the toggle selector 8 can be controlled by the receiver 9 .
[0047] In another film antenna 2 , a plurality of, for example, two antenna elements 11 and 12 are formed on the surface of a synthetic resin film substrate 10 . Three or more antenna elements may also be formed. Each antenna element 2, 3 is led out from the front windshield 4 to the side of the strut portion 6 via feeder wires 13, 14, and is connected to an input terminal of an amplifier 16 at...
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Film antennas which are stuck to a front glass of a vehicle is of such a structure that a plurality of antenna elements are formed on a film substrates. Amplifiers are disposed at pillar parts, and in the vicinity of power supply points to the antenna elements grounding to a high-frequency component by high-frequency grounding members are carried out. The high-frequency grounding members can be fixed simply by sticking them on a coating film etc. for covering an exterior part of a vehicle body, and a work of peeling the coating film becomes unnecessary, and therefore, it is possible to easily carry out a work which comes up with antenna installation to a vehicle. Grounding to a direct current component is carried out, away from the power supply points through DC earth in the vicinity of a selector and a receiver.
Description
technical field [0001] The present invention relates to a vehicle antenna installed in a vehicle body exterior of a vehicle and a diversity reception device using the vehicle antenna. Background technique [0002] Conventionally, various antennas for vehicles are known in order to receive broadcast radio waves and communication radio waves even when vehicles such as automobiles are moving. A film antenna is known as an antenna mounted on a window glass or the like of a vehicle (for example, refer to Patent Document 1). In this film antenna, a plurality of pairs of antenna elements are formed on a film substrate, and an amplifier having a connector is connected to one end of the film substrate. According to this patent document, a film substrate and an amplifier are mounted on the rear glass of a vehicle, etc., and a ground line composed of elements is formed on the film substrate, and grounding is not required on the amplifier side. It also discloses diversity reception by...
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IPC IPC(8): H01Q3/24H01Q1/12H01Q1/22H04B7/08H04B7/26
CPCH01Q1/1271
Inventor 荻野和滋
Owner FUJITSU GENERAL LTD