FI82323B - Aerial for vehicles - Google Patents

Abstract

The invention concerns an aerial for a vehicle for VHF/UHF/SHF frequencies, which aerial comprises an aerial part 1 and a fitting part 2 and is connected to a transmitter/receiver device by means of a feed cable 3. The aerial can be attached by its fixing part between the vehicle's opening window 4 and the vehicle or its door-frame 5 by closing the window. The impedance matching of the aerial is carried out by changing the electrical connection point between the fixing part and the feed cable. The fixing part acts as a current transmission path between the receiver/transmitter device and the outside world. <IMAGE>

Description

82323

VEHICLE ANTENNA - ANTENNA FOR FORDON

The present invention relates to a vehicle antenna for VHF / UHF / SHF frequencies having a radiating part and a matching part, which is connected to a transmitter / receiver device by a supply cable.

As mobile telephony becomes more common, the use of portable radio devices in particular is increasing. The decisive factor for the functionality of the station is the antenna. Temporary use has so far been limited by complex antenna installations.

The object of the present invention is to develop an easy-to-install and movable vehicle antenna which can be quickly installed and removed by the end user himself.

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Attaching the antenna to the side mirror holder is known from U.S. Pat. No. 4,161,735, from the luggage compartment lid slot through U.S. Pat. No. 4,035,806 and through a windscreen or side window from U.S. Pat. No. 4,764,773, U.S. Pat. No. 4,794,319 and EP 137,391.

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The vehicle antenna according to the invention is characterized in that the length of the radiating part is about 1/2 wavelength or a multiple thereof and the length of the fitting part is about 1/4 wavelength or an odd multiple of the length of the fitting part in the longitudinal direction substantially S- and laterally substantially U- shaped so that the fitting part is fitted by means of a pin on the side of its connecting cable between the window to be opened by the vehicle: and the door or body so that the antenna is; can be attached from its fitting part between the window and the car or door: 30 by closing the window, and that the impedance matching of the antenna takes place by means of the placement of the galvanic connection points of the fitting part and the supply cable.

The antenna according to the invention does not require antenna foot or feed conductor holes. At the same time, the adapter part acts as a quick-mount part of the antenna, in which case a separate mounting part is not required.

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In addition, it is more powerful than a 1/4 wave antenna and does not require ground planes to operate.

In the following, the invention will be described in more detail by means of Example 5 with reference to the accompanying drawing, in which

Figure 1a shows a window antenna according to the invention mounted on a car window.

Figure 1b shows the mounting of the antenna.

Figure 2 shows a window antenna according to the invention.

The window antenna 15 for the VHF / UHF / SHF frequencies fitted to the car window according to Figures 1a and 1b has an insulated antenna radiating part 1 of copper, aluminum or steel and plastic and a wire-shaped S-shaped fitting part 2. As a supply cable 3 connected at one end transmitter / receiver device (not shown), a normal 20 or low loss 50 Ω coaxial cable will work. The fastening takes place between the upper edge of the opening window 4 of the car and the upper support structure 5 of the door or body, opening and closing the window (according to the arrows in Fig. 1b), whereby the supply cable side pin remains between the window and the superstructure. In addition, there are window insulators (not shown) between the 25.

Figure 2 shows the antenna of Figures 1a and 1b in more detail. The length of the antenna radiator is 1/2 wave or a multiple thereof, and the total length of the S-curve of the fitting part (in the plane direction of the window 30, i.e. in the longitudinal direction) is 1/4 wave or an odd multiple thereof. The matching to the supply line takes place without a separate inductance or capacitance. Both terminals of the supply cable 3 are galvanically connected to the fitting part 2, which at the same time acts as a bracket and as a power-35 transmission path outside the car. Impedance matching is done by changing the galvanic junctions 7 (in the fabrication and QC-3 82323 step). Due to the matching method, no separate ground levels are required. The fitting part is U-shaped when viewed from the side, and the connection points are on different halves of the fitting part close to the bottom of the U.

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It will be clear to a person skilled in the art that the various embodiments of the invention are not limited exclusively to the above example, but may vary within the scope of the following claim.

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Claims (1)

CLAIM 4 82323 Vehicle antenna for VHF / UHF / SHF frequencies with a radiating part (1) and a matching part (2) connected to the transmitter / receiver device by a supply cable (3), characterized in that the length of the radiating part is about 1 / 2-wavelength or a multiple thereof and the length of the fitting part about 1/4 wavelength or an odd multiple of the fitting part being substantially S-shaped in the longitudinal direction and 10 substantially U-shaped in the lateral direction, the fitting part being fitted with a between the window (4) and the door (5) or body so that the antenna can be attached from its fitting part between the window (4) and the body or door (5) by closing the window, and that the antenna im-15 is matched to the galvanic connection points (7) of the fitting part and the supply cable through investment. 5 82323 An antenna for switching to a VHF / UHF / SHF frequency, a single antenna with a power supply (1) and an in-use connection 5 (2) and a power supply for the genome and power supply (3), to be converted the first or second part of the device and the insertion means the first or second part of the device and the insertion of the connection with the end of the operation of the mains of the antenna (4) and the crossing (4) or the crossing (s) of the antenna with the passage of the crossing (4) and 15 crossing with the crossing (5) of the crossing, antennas impedanspassning äger rum genom att ändra galvaniska förbindningsställen (7) mellan inpassningsdelen och matarledningen.