Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/27—Adaptation for use in or on movable bodies
  • H01Q1/32—Adaptation for use in or on road or rail vehicles
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q1/00—Details of, or arrangements associated with, antennas
  • H01Q1/12—Supports; Mounting means
  • H01Q1/1271—Supports; Mounting means for mounting on windscreens
  • H01Q1/1278—Supports; Mounting means for mounting on windscreens in association with heating wires or layers

Definitions

• Diversity antenna systems are used to improve reception quality in vehicles.
• a subdivided heating field housed in the rear window of a motor vehicle and, if appropriate, two further antenna systems installed in the front window of a car or elsewhere are used and supplemented to form a so-called antenna diversity system.
• the received signal is evaluated continuously and in discrete steps in order to switch to a different antenna in the event of a determined deterioration. This is to ensure the best possible reception.
• a scanning antenna system for vehicles has become known, for example, from EP 1 021 000 A2.
• an antenna system for vehicles with a multi-antenna system and with at least two antennas can be seen as known, from whose reception Voltage at least two antenna signals are formed.
• These signals are fed to a logic switching device with which a switching signal that is different in terms of diversity can be switched through to the receiver with different switching positions.
• a logic switching device with which a switching signal that is different in terms of diversity can be switched through to the receiver with different switching positions.
• this controls a diversity processor which, in the event of a reception disturbance, quickly switches the logic switching device to another switching position.
• a diversity antenna system is also known from EP 0 792 031 A2.
• This known antenna system also includes a controllable switching device and a receiver connected via an antenna line.
• a fault detector is present in the receiver, which indicates a reception fault in the reception signal or in the IF signal by means of a display signal.
• the antenna system with the controllable switching device comprises several individual antennas or antenna parts.
• a heating field in a motor vehicle is preferably used as the antenna device, and preferably a divided antenna field.
• the two halves of the heating field integrated in the rear window are each connected to an amplifier on the output side, the two amplifiers then being connected to a switching device with a connecting line leading to the radio receiver. are bound.
• a large number of further antenna connection points are provided, at which corresponding antenna reception signals can be tapped in order to achieve the broadest possible diversity system.
• a diversity antenna for a diversity antenna system in a vehicle is also known from DE 100 33 336 AI.
• a heating field is always used as the antenna, which heating field can comprise one or more electrically separately controllable sections.
• the heating field is usually provided with two busbars, each of which is connected to a heating line.
• the heating fields have separate antenna connections to which, for example, a radio can be connected.
• the second antenna connection is then, for example, in the impedance network and a switching device is connected, via which it is to be ensured that when a reception disturbance occurs in the antenna signal, a switchover of the impedance value of at least one electronically controllable impedance network forms a diversity-different antenna signal at the output of the connection network.
• Two switching diodes are used in the impedance network, which means that four different reactances can be generated.
• the invention is based on a single active antenna, which is preferably formed by the heating lines of a heating disc in a vehicle.
• an amplifier is connected at least indirectly to the antenna connection point.
• the actual receiving box for the radio can be provided separately from this.
• the amplifier itself can also be integrated into the radio.
• a corresponding evaluation regarding the quality of the received antenna signal is also carried out via a diversity processor.
• a heating field for example on a rear window of a vehicle, usually has two busbars, to each of which a heating line leads or a heating connection is connected to it. This is where the power connection for heating the heating field is made.
• a tuning and / or switchover box is connected to a second antenna connection point.
• This tuning box is used to change the reactance either in analog or in discrete individual steps by switching so that an optimal antenna signal can be received.
• an analog signal ie a tuning voltage
• a digital-to-analog converter which is then fed to the voting box.
• the reactance is changed accordingly, which determines the directional characteristic of the antenna elements formed by the heating field. direction can be changed accordingly.
• the diversity processor can be used to switch between different reactances.
• the heating field is therefore only connected to two connection points, namely the radio is connected at least indirectly to one connection point, whereas a tuning or switch box is connected to the second connection point, which is at least indirectly connected to the diversity processor to change the directional characteristic the antenna is controlled.
• the main advantage of this circuit arrangement is that the entire arrangement is extremely low-cost, and that only one amplifier is required, that no special heating conductor radiators with additional connection points are necessary, and that an existing heating field with its Both connection points for the plus or minus pole can be used as a connection point for the retrofittable diversity antenna system.
• Figure 1 A first embodiment of a diversity antenna system with a tuning box
• FIG. 2 a diversity antenna system with a conversion switch box.
• a heating field 1 is shown schematically in FIG. 1, which is formed from two opposing busbars 3 and a plurality of heating wires 5, which generally run in parallel therebetween. Such heating fields 1 are usually housed in the rear windows of vehicles. The wires are inserted into the glass or printed on the glass.
• Such a heating field 1 also acts and is used as a window pane antenna 7, hereinafter also referred to as antenna 7.
• the heating field 1 is connected in a known manner to a motor vehicle battery 11, for example the positive pole 13 of the battery being connected via a choke 15 to a first connection 17 of the heating field 1, which forms a connection to the one busbar 3.
• the negative pole 19 is usually ultimately electrically connected via ground 21 to the second connection 23, which represents the connection to the second busbar 3.
• an amplifier 25 is connected at least indirectly on the input side to the first connection 17 of the heating field 1 or the antenna 7, the output side of the amplifier 25 being connected to the actual receiving part or radio 27.
• An IF signal is generated via the radio, which can be evaluated in a downstream diversity processor 29.
• a voting box 31 is now used to implement a diversity antenna system and is controlled analogously.
• the output of the diversity processor 29 is connected to the input of a digital-to-analog converter 33, the output of which is connected to an input 35 of the tuning box 31.
• Suitable tuning circuits can now be provided in the tuning box in order to change the connection-side reactance and thus to put different loads on the base point of the antenna. As a result, the directional characteristic of the heating field 1 serving as antenna 7 is changed.
• the voting box has three branches 37a to 37c connected in parallel, which are ultimately connected between the second connection 23 and at least indirectly the second pole 19 or the ground 21.
• a resistor R1 and a capacitor C1 are connected in the first branch 37a, a coil L, a capacitor C2 and a capacitance diode D1 in the second branch 37b, and a capacitor C3 with a capacitance diode D2 is connected in series in the third branch 37c.
• the control line 41 connected to the digital-to-analog converter 33 leads via a resistor R2 to a connection point 43 between the capacitor C3 and the capacitance diode D2 in the third branch 37c, the control line 41 via a resistor R3 to a second one Connection point 43 'can be continued or extended, which is connected between the capacitor C2 and the capacitance diode Dl in the second branch 37b.
• the ground (negative pole) and the second Connection 23 can also be connected to a coil 45 for deriving the heating field current.
• a list of priorities can even be stored in a memory device (e.g. in the radio or in the diversity processor), which determines in which direction and / or to which values the reactances are first changed by correspondingly controlling the tuning box.
• any termination impedances can thus be set in the tuning box within a certain frequency range (variable blind line).
• the exemplary embodiment according to FIG. 2 largely corresponds to that according to FIG. 1 and differs essentially in that no continuous, i.e. analog control box 31, but a switch box 31 'is used. For this reason, a digital-to-analog converter 33 is not necessary in the exemplary embodiment according to FIG. 2, since here the diversity switch 29 can directly control the switch box 31 '.
• the switch box is also connected again between the ground connection 23 or the negative pole 19 and the second antenna connection 23 and has a control input 43, via which the diversity processor 29 corresponds Switching signals are received.
• the switch box 31 also again has three branches 37a to 37c, namely a first branch 37a with an inductor 11, a parallel second branch 37b with a capacitance C4 and a resistor R4 connected in series therewith, and a third branch 37c with one Capacity C5. While all three branches are connected together on the ground side, a switch 47 is provided on the antenna field side, which is controlled accordingly via the diversity processor. In this way, in the event of interference during reception, a switchover can be carried out in the switchover box in order to change the reactance and the directional characteristic of the antenna.
• the tuning or tuning box 31 according to FIG. 1 or the switch box 31 'according to FIG. 2 are only examples.
• the structure of this tuning or switch box 31, 31 ' can also be carried out differently, and if necessary also with several branches.

Landscapes

• Details Of Aerials (AREA)
• Radio Transmission System (AREA)
• Variable-Direction Aerials And Aerial Arrays (AREA)
• Support Of Aerials (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=27797777

Family Applications (1)

Country Status (16)

Families Citing this family (11)

Family Cites Families (12)

• 2002
  • 2002-03-14 DE DE10211341A patent/DE10211341A1/de not_active Withdrawn
• 2003
  • 2003-03-06 EP EP03714782A patent/EP1366540B1/fr not_active Expired - Lifetime
  • 2003-03-06 CA CA002444249A patent/CA2444249C/fr not_active Expired - Fee Related
  • 2003-03-06 PL PL363069A patent/PL206363B1/pl unknown
  • 2003-03-06 MX MXPA03010096A patent/MXPA03010096A/es active IP Right Grant
  • 2003-03-06 ES ES03714782T patent/ES2233916T3/es not_active Expired - Lifetime
  • 2003-03-06 WO PCT/EP2003/002310 patent/WO2003077362A1/fr active IP Right Grant
  • 2003-03-06 KR KR1020037013877A patent/KR100799084B1/ko not_active IP Right Cessation
  • 2003-03-06 JP JP2003575458A patent/JP3978428B2/ja not_active Expired - Fee Related
  • 2003-03-06 DE DE2003500187 patent/DE50300187D1/de not_active Expired - Lifetime
  • 2003-03-06 RU RU2003129666/09A patent/RU2305878C2/ru not_active IP Right Cessation
  • 2003-03-06 CN CNB038002604A patent/CN1323463C/zh not_active Expired - Fee Related
  • 2003-03-06 BR BR0303376-7A patent/BR0303376A/pt not_active IP Right Cessation
  • 2003-03-06 US US10/470,489 patent/US6867739B2/en not_active Expired - Lifetime
  • 2003-03-06 AU AU2003219021A patent/AU2003219021A1/en not_active Abandoned
  • 2003-03-06 AT AT03714782T patent/ATE284572T1/de not_active IP Right Cessation
• 2004
  • 2004-10-07 HK HK04107713A patent/HK1065170A1/xx not_active IP Right Cessation

Non-Patent Citations (1)

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