DE202006020814U1 - Antenna arrangement on a motor vehicle - Google Patents

Abstract

Antenna arrangement (1) on a motor vehicle (A) which is connected to an essentially flat dielectric support (2)
A first group of interconnected electrically conductive elements (3) connected to a supply source (4),
- A second group of electrically conductive elements (5), each of which is connected to at least one pair of conductors (3) of the first group of conductive elements, wherein the electrically conductive elements (5) along the at least one pair of conductors (3) forming a composite structure (20) in which one or more, iw, polygonal shapes are defined,
A feed element (6) which is capacitively connected to the first conductors (3) and the second conductors (5),
wherein the feed element (6) has two or more tap points (10, 11) for radio frequency signals to be received by the antenna device (1),
characterized in that at least two of the tapping points (10, 11) are spaced apart from each other, the i ....

Description

The The invention relates to an antenna arrangement, in particular serves to be installed on the rear window of a motor vehicle To receive radio waves.

motor vehicles are equipped with antennas to differentiate radio waves from radio frequency signals Receive applications, for example for mobile phones, FM radio, AM radio, satellite navigation systems or television signals.

In terms of FM radio is a special receiving technique known below and the phase diversity or phase diversity ("Phase deversity").

From Broadcasting radio waves reach the receiving antennas via Routes that often have many obstacles, for example in the form of buildings or mountain elevations such as hills or mountain ranges. Each of these obstacles has the effect that the incident radio waves are distracted. The result is that incident on the receiving antenna numerous radio waves, which are provided by the same source and the same information contained, but from different directions and too different Arrive times. This phenomenon causes a bad one Quality of received radio signals.

Around to avoid this disadvantage, was the already mentioned Technology of "Phase Diversity" developed at the two receiving antennas are used and a phase deflection and attenuation between two or more received signals is then generated dynamically, so that's out of it resulting signal is qualitatively better. For this purpose serves the Use of two or more spaced apart antennas whose Distance equal to half the wavelengths of the Radio wave band that the antenna can receive is an optimal one Result. A separate circuit, which belongs to the electronic Belongs circuits for processing the received radio signals, Ensures that the two signals in a suitable manner combined to get a signal of better quality.

from that It follows that the technique of the phase manifold simultaneously requires several receive antennas whose received radio frequency signals be added to obtain a signal of better quality.

This technique therefore differs from another technique known by the term "scan diversity" and, for example, in US Pat JP 58 070 645 in which several antennas are used, but do not work simultaneously. The technique of "scan diversity" has its own electronic circuitry to select the antenna that receives the best radio frequency signal.

It It is known that a certain type of vehicle antennas of the state The technique has multiple conductors mounted on a dielectric surface which are generally from the rear window of a vehicle consists.

It is also known that on the rear window of a vehicle a Group of strips of conductive material is attached, the generally parallel to each other and with their ends short-circuited and connected to the starter battery of the vehicle are. In this way, a heater is formed to the rear window to get rid of ice or frost. For this it is necessary that the glass heater most of the Window surface of the rear window occupies, so for an antenna only very little space is available.

Around in the coexistence of antenna and disk heater on the same Rear window surface a solution to this problem It is known that the electrically conductive Arranging elements orthogonal to the heating conductors, wherein the conductive Elements connect equipotential points to each other a uniform distribution of the de-icing stream to ensure. The advantage is achieved that the heated rear window acts as a metallic surface, can receive the radio frequency waves.

An embodiment of such an antenna is in US Pat. No. 6,693,597 B2 explained, wherein the antenna consists of a plurality of conductors which are orthogonal to the heating conductors for the rear window and have a substantially polygonal shape.

• – Verwendung eines zusätzlichen Leiters, genannt Einsgeiser oder „Feeder”, der kapazitiv mit der Scheibenheizung und galvanisch mit der dabei verwendeten elektronischen Schaltung verbunden ist;
• – durch eine galvanoelektrische Verbindung mit der Scheibenheizung, wobei diese Lösung im Allgemeinen zumindest in der Technik der „Phase Diversity” eingesetzt wird, und zwar wegen der Notwenigkeit eines Zwischenraums zwischen den Abgriffspunkten für die empfangenen Radiowellen.

The decrease of the received radio waves can take place in two ways:

• - Use of an additional conductor, called Einsgeiser or "feeder", which is capacitively connected to the disk heater and galvanically connected to the electronic circuit used therein;
• By a galvano-electrical connection to the disk heater, this solution generally being used at least in the technique of "phase diversity" because of the need for a gap between the tap-off points for the received radio waves.

All antennas of the prior art ge according to the above description have a number of disadvantages.

Especially the rear window heating causes low frequency noise at the antenna, which in some cases inevitably the correct reception of AM band signals.

As already mentioned, the rear window heater is electric connected to the starter battery of the vehicle, so by others Systems in the vehicle low-frequency noise are generated. This Disadvantage is particularly significant when tapping radio frequency signals in the AM band via a direct electrical connection with the antenna. In order to reduce this effect, arrangements are known, where low-frequency filter between the battery and the rear window heater can be used, which, however, increases the cost become.

It is therefore an object of the invention, the disadvantages explained to avoid and an antenna arrangement for the rear window to provide a motor vehicle, which also includes a window heater without the need to between the feed circuit for the antenna and the Disc heater filter to install.

A Another object of the invention is the antenna arrangement be interpreted as meaning that the technique of phase difference ("phase Diversity ") can be used.

According to the Invention achieves this object with an antenna arrangement on a Motor vehicle with the features specified in the protection claim 1 solved.

at The invention is provided according to a further feature that the dielectric carrier the rear window of the motor vehicle is and that the leading elements of the first group essentially are arranged parallel to each other to a heater for to form the rear window of the vehicle.

In Development of the invention, the feed element runs substantially parallel to the longitudinal axis of the first group the conductive elements and has for this purpose a distance.

The Feed element that has a capacitive coupling with the rear window heating and the arrangement of tapping points for the allow received radio frequency signals on the feed element the solution of the problem explained above, the caused by the low-frequency noise, the arise at the signal tapping points when they are galvanic are connected to the rear window heater.

Further Features and advantages of the invention will become apparent from the others Protection claims and from the following description of a Embodiment, which is shown in the drawing is. Show it:

1 the view of an antenna arrangement according to the invention and

2 the schematic view of a possible use of a motor vehicle.

The total with 1 designated antenna arrangement according to the invention on a motor vehicle A is on a substantially flat support 2 arranged of dielectric material and consists of a first group of electrically conductive elements 3 which are arranged substantially parallel to each other and with their ends to a supply source 4 are connected.

A second group of electrically conductive elements 5 is arranged so that each of these between a pair of conductive elements 3 the first group is arranged.

Another component of the antenna arrangement 1 According to the invention is a feed element 6 ("Feeder") for radio frequency signals coming from the antenna 1 come.

According to the invention, the feed element 6 , which is capacitive with the first group 3 and the second group 5 coupled to the conductive elements, two tap points 10 and 11 for radio frequency signals, the two tap points 10 and 11 have a distance from each other that corresponds to substantially half of a wavelength of the radio frequency signals that the antenna array 1 can receive.

In other applications, which are not shown here, more than two tapping points can be provided, whose mutual distance regardless of the wavelength the radio waves of the radio frequency signals is what the antenna can receive.

Out 2 it follows that the dielectric carrier 2 is formed by the rear window of the motor vehicle A.

According to a preferred embodiment of the invention, the conductive elements are made 3 the first group of strips of conductive material, which on the surface of the dielectric support 2 (Rear window) are attached and take over the function of a rear window heater. To For this purpose are the ends of all conductive elements 3 the first group short-circuited and electrically to the supply source 4 connected, which is the starter battery of the motor vehicle A according to a preferred embodiment.

In a preferred embodiment of the invention, the conductive elements also exist 5 the second group of strips of a conductive material, which are on the surface of the carrier 2 (Rear window) of the motor vehicle A are mounted.

Each of these conductive elements 5 the second group is between two conductive elements 3 the first group attached, so that both groups together a composite structure 20 form in which polygonal shapes are defined.

It It should be emphasized that the illustrated embodiment does not represent any limitation of the invention. So can in other embodiments, not shown here are a complex and asymmetrical arrangement of polygonal Be provided forms.

As already mentioned, the feed element has 6 two tapping points 10 and 11 whose spacing is substantially equal to half the wavelength of the radio waves of the radio frequency signals representing the antenna array 1 can receive. The feed element 6 is made of conductive material and is preferably made of a conductor strip which is on the surface of the carrier 2 (Rear window) is attached.

All conductive strips are arranged parallel to each other, wherein the conductive elements 5 the second group is tight between the leading elements 3 the first group to make a capacitive coupling.

The tapping points 10 and 11 are electric with control electronics 15 connected to the signals via an amplifier 16 to process; both devices 15 and 16 are housed within the motor vehicle A.

In a preferred embodiment, the control electronics 15 an electronic circuit for the function of said phase difference (phase diversity).

In other embodiments, no amplifier is provided so that the tap points 10 and 11 directly with the control electronics 15 are connected.

The control electronics 15 may further comprise a circuit for processing AM radio signals and a circuit for processing FM radio signals.

In further implementation possibilities, electronic controls are provided for satellite navigation systems, mobile telephones, television signals or the like associated with the antenna arrangement 1 can be connected according to the invention.

Also not shown is the possibility of conducting elements 3 and 5 as well as the feed element 6 made of wires of conductive material contained in the dielectric support 2 (Rear window) are embedded.

As already explained, the antenna arrangement 1 according to the invention on the rear window 2 a motor vehicle A are mounted and takes over in operation in addition to the function as an antenna and the function of a rear window heater.

Each radio wave pointing to the surface of the rear window 2 and thus on the leading elements 3 and 5 impinges, generates in this a current which, in the case of electromagnetic waves, their wavelength to the antenna array 1 adjusted, has a significant amperage. In this way, an electric field is generated by the antenna arrangement 1 taken off and over the amplifier 16 to the control electronics 15 is passed, which process the received signals. The tap takes place at the feed element 6 ,

Because the feed element 6 from the leading elements 3 and 5 the first and the second group is separated and capacitively coupled with it, the advantage is achieved that the removed radio signals are not affected by low-frequency noises, which are typical at signal tapping points, which are galvanically connected to the rear window heater.

Furthermore, since the tapping points 10 and 11 have a pitch equal to one-half of a wavelength of the received FM band signals, the antenna arrangement according to the invention allows to optimize the reception of these signals via the technique of phase difference.

The of the feed element 6 tapped signals are sent to the control electronics 15 passed them through the two tap points 10 and 11 processed as these over the amplifier 16 with the control electronics 15 are connected.

From the above description it is clear that an antenna arrangement for the rear window of a motor vehicle is available, which cooperates with the rear window heater, without the In this case, low-frequency filter between the two systems must be used. Furthermore, the invention allows the use of the technique of "phase diversity".

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - JP 58070645 [0007]
• - US 6693597 B2 [0011]

Claims (13)

Antenna arrangement ( 1 ) on a motor vehicle (A) which is equipped with an iw flat dielectric support ( 2 ), comprising - a first group of interconnected, electrically conductive elements ( 3 ) connected to a supply source ( 4 ), - a second group of electrically conductive elements ( 5 ), each with at least one pair of conductors ( 3 ) of the first group of conductive elements, the electrically conductive elements ( 5 ) along the at least one pair of conductors ( 3 ), whereby a composite structure ( 20 ), in which one or more, iw polygonal shapes are defined, - an injection element ( 6 ), with the first ladders ( 3 ) and the second ladders ( 5 ) is capacitively connected, wherein the feed element ( 6 ) two or more tapping points ( 10 . 11 ) for the antenna arrangement ( 1 ) to receive radio frequency signals, characterized in that at least two of the tap points ( 10 . 11 ) have a distance from each other, which corresponds approximately half of one of the wavelengths of the radio-frequency signals, for the reception of which the antenna arrangement ( 1 ) and that at least two tapping points ( 10 . 11 ) with a control electronics ( 15 ) are connected to provide phase diversity. Antenna arrangement ( 1 ) according to claim 1, characterized in that at least one of the tapping points ( 10 . 11 ) with a control electronics ( 15 ) for processing AM radio frequency signals. Antenna arrangement ( 1 ) according to any one of the preceding claims, characterized in that the dielectric support ( 2 ) is the rear window of the motor vehicle (A). Antenna arrangement ( 1 ) according to one of the preceding claims, characterized in that the conductive elements ( 3 ) of the first group iw are arranged parallel to one another. Antenna arrangement ( 1 ) according to one of the preceding claims, characterized in that the feed element ( 6 ) consists of an electrically conductive material. Antenna arrangement ( 1 ) according to claim 5, characterized in that the feed element ( 6 ) has a longitudinal axis, the iw parallel to the longitudinal axis of the first group of conductive elements ( 3 ) runs. Antenna arrangement ( 1 ) according to one of the preceding claims, characterized in that the first group ( 3 ) and the second group ( 5 ) of the conductive elements and the feed element ( 6 ) consist of strips of conductive material deposited on a surface of the dielectric support ( 2 ) are mounted. Antenna arrangement ( 1 ) according to one of claims 1 to 6, characterized in that the first group ( 3 ) and the second group ( 5 ) of the conductive elements and the feed element ( 6 ) consist of wires of conductive material which are incorporated in the dielectric support ( 2 ) are embedded. Antenna arrangement ( 1 ) according to one of the preceding claims, characterized in that it is provided with control electronics ( 15 ) for the processing of the antenna array ( 1 ) received radio frequency signals is connected. Antenna arrangement ( 1 ) according to claim 9, characterized in that this with the control electronics ( 15 ) via an amplifier ( 16 ) connected is. Antenna arrangement ( 1 ) according to claim 9 or 10, characterized in that the control electronics ( 15 ) has one or more electronic circuits for the processing of radio frequency signals for AM radio, FM radio, satellite navigation systems, mobile phones, television signals or their combination. Antenna arrangement ( 1 ) according to one of claims 3 to 11, characterized in that the first group ( 3 ) of the conductive elements, a heater for the rear window ( 2 ) of the motor vehicle (A). Antenna arrangement ( 1 ) according to one of the preceding claims, characterized in that the supply source ( 4 ) is the starter battery of the motor vehicle (A).