RU2265925C2 - Motor-car antenna assembly - Google Patents

Motor-car antenna assembly Download PDF

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Publication number
RU2265925C2
RU2265925C2 RU2002133156/09A RU2002133156A RU2265925C2 RU 2265925 C2 RU2265925 C2 RU 2265925C2 RU 2002133156/09 A RU2002133156/09 A RU 2002133156/09A RU 2002133156 A RU2002133156 A RU 2002133156A RU 2265925 C2 RU2265925 C2 RU 2265925C2
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Russia
Prior art keywords
car
matching
antenna
lock
movable
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RU2002133156/09A
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Russian (ru)
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RU2002133156A (en
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Общество с ограниченной ответственностью "Интеллектуальные проекты"
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Priority to RU2002133156/09A priority Critical patent/RU2265925C2/en
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Abstract

FIELD: motor car construction; antenna assembly for motor-car radio receiving system.
SUBSTANCE: proposed motor-car antenna assembly incorporating slit antenna formed by clearance between motor-car body and its movable part has its matching device made in the form of flat micromodule installed on lock member of motor-car body movable part. Front surface of micromodule printed-circuit board is divided into two areas, passive electric and radio components are disposed on first area and covered with sealing material layer; first contact pad is made on second area and second contact pad, on rear side of printed-circuit board. The latter is provided with fastening hole; mentioned first and second contact pads are connected to electric circuit leads of matching device and abut against edges of fastening hole.
EFFECT: facilitated mounting, enhanced mobility and resistance to mechanical impacts, and enlarged frequency band of antenna assembly.
5 cl, 3 dwg

Description

The invention relates to the field of automotive industry and can be used in the design of the antenna device of the car radio reception system,

Known, see German application DE 4000381, MKI5 H 01 Q 1/32, publ. 07/11/91, the possibility of using a gap between the car body and the rear movable part of the body (trunk lid or rear door, depending on the type of body) as a slotted receiving antenna of the car, limited by the hinges on which the movable part mentioned above is mounted.

The advantages of such an antenna are its secretive placement, resistance to manifestations of vandalism and low cost.

To match the input complex resistance of a slot antenna not tuned to the resonance, which is a gap in the car body, with an antenna cable impedance of 75 Ohms (less often 50 Ohms), a matching device is included in the design of the antenna device.

The slot antenna matching device should be located as close as possible to the antenna connection point, which, for example, can be a part of the lock of the movable body part (trunk lid or rear door). The closer the matching device is to the antenna connection, the less the loss of the useful signal and the higher the signal level at the input of the receiving device.

It is known, see [1], the design of the antenna device of the car, including a slotted receiving antenna of the car, made in the form of a gap between the electrically conductive car body and the rear movable part of the body, limited by loops on which the aforementioned movable part is mounted, the electrically conductive parts of the lock movable body parts, the first of which is attached by means of threaded elements to the car body, and the second to the movable body part, a dielectric plate installed between the car body I and the detail of the lock, as well as the matching device mounted on the car body and including a ferrite core transformer and a tuning capacitor connected to the electric circuit.

This device has a lot of disadvantages that make it impossible for its industrial use:

- cumbersome design, due to the significant dimensions of the matching device;

- the high cost of the antenna device due to the use in the design of the matching device transformer and trimmer capacitor;

- the high complexity of the installation of the antenna device, due to the need to install the matching device on the car body and to carry out work on setting up the matching device;

- low reliability of the antenna device;

- poor repeatability of the parameters of the antenna device due to the presence in the design of the matching device transformer and trimmer capacitor;

- limited frequency range;

- low resistance to mechanical stress.

For the prototype of the inventive antenna device of the car taken the design of the antenna device of the car, described in the same source [1].

The prototype includes a slotted receiving antenna of the car, made in the form of a gap between the electrically conductive car body and the movable body part, limited by loops on which the aforementioned movable body part is mounted, the electrically conductive lock parts of the movable body part, the first of which is attached by threaded elements to the body car, and the second - to the moving part of the body, a dielectric plate installed between the car body and the first part of the lock, as well as matching devices о, mounted on the car body and including three trimmer capacitors and two frameless inductors connected to the electric circuit.

The disadvantages of the prototype are:

- the high complexity of the installation of the antenna device, due to the need to install the matching device on the car body and to carry out work on setting up the matching device;

- low reliability of the antenna device;

- poor repeatability of the parameters of the antenna device due to the presence of three trimmer capacitors in the design of the matching device;

- limited frequency range;

- low resistance to mechanical stress.

The objective of the invention is the creation of an antenna device of a car that uses a gap in the car body as an antenna, easy to install, with increased reliability, resistance to mechanical stress and an extended frequency range.

This problem is solved in the antenna device of the car, which includes a slot antenna formed by the gap between the car body and the movable part of the car body, electrically conductive lock parts of the movable body part, the first of which is attached by threaded elements to the car body, and the second to the movable body part a car, a dielectric plate installed between the car body and the first part of the lock, as well as a matching device mounted on the car body and including I connected to the electrical circuit of passive electric radio.

The problem is solved in that the matching device of the antenna device is structurally made in the form of a flat micromodule and placed on the lock parts of the movable part of the car body, the front surface of the micromodule printed circuit board is divided into two sections, passive electro-radio elements are placed in the first section and covered with a layer of sealing substance, in the second section on the front surface of the printed circuit board, the first contact pad is made, on the back surface of the printed circuit board, the second contact pad, printed the board is provided with a mounting hole, and these contact pads are connected to the terminals of the electrical circuit of the matching device and are adjacent to the edges of the mounting hole. In this case, the matching device can be installed on the latch lock of the trunk of the car body or on the latch lock of the rear door of the car body. At the same time, the matching device can be fixed to the lock parts of the movable part of the car body by means of a standard threaded element designed for fastening the specified lock parts.

In this application, a flat micromodule is understood to mean a functionally complete assembly of a matching device consisting of a printed circuit board with an ERE located on it (for the term, see [2]).

The invention is illustrated by the following drawings. Figure 1 shows the design of the matching device. Figure 2 shows an example of the best implementation of the electrical circuit matching device. Figure 3 shows the design of the antenna device of the car.

To implement the invention, the matching device (see Figure 1) can be made in the form of a flat micromodule M, including a printed circuit board 1, for example, a double-sided metallized printed circuit board, with a front S1 and back S2 surfaces, the front surface S1 of the board is divided into two section 2, 3, and passive ERE 4 are located on section 2, connected by printed conductors to the electrical circuit and covered with a layer 5 of a sealing substance, and on section 3 the first contact pad 6 is made for electrical connection with the body of the car mobile, on the back surface S2 of the printed circuit board 1, a second contact pad 7 is made for electrical connection with the moving part of the car body, the printed circuit board is provided with a mounting hole 8, and the contact pads 6, 7 are connected to the terminals of the electrical circuit of the matching device and are adjacent to the edges of the mounting hole 8 .

The best version of the electrical circuit of the matching device is shown in Fig.2. The matching device diagram consists of the minimum number of EREs and has shown the best practical results during testing as part of the vehicle’s antenna device. The circuit includes a matching bridge, in the shoulders of which are included passive EREs - two capacitors C1 and C2 and two inductors L1 and L2. In a preferred embodiment, surface mount capacitors can be used as capacitors C1 and C2, and inductors L1 and L2 can be made by etching the printed circuit board in the form of curved printed conductors.

In a preferred embodiment, the micromodule M of the antenna device of the vehicle is equipped with a piece of coaxial radio cable Q, the central conductor and the braid of the radio cable Q are connected in section 2 to the electrical circuit of the matching device, and then the connection of the central conductor and the braid of cable Q with the electrical circuit of the matching device is then covered with a layer of sealing material . In this case, the sealing substance performs both the function of sealing the electrical connection, and the functions of mechanical protection of the input point of the radio cable Q and mechanical fixation of the end of the radio cable Q on the surface of the micromodule M.

The design of the inventive antenna device of the car is presented in Fig.3.

The antenna device of the car, see Figure 3, includes a body 9 made of a conductive material with an opening Z for the moving part of the body and the moving part 10 of the body.

As mentioned previously, for example, a rear door or a trunk lid can act as a movable body part 10.

The movable part 10 is mounted on the hinges 11 in the opening Z of the body 9.

The slotted antenna 12 of the antenna device of the car is implemented in the form of a gap between the body 9 and the moving part 10.

To implement the invention, the lock part 13 of the movable part 10, which may be, for example, a lock latch, is isolated from the body 9, for example, by means of a gasket 14, after which the antenna 12 is connected to a receiving device (not shown in FIG. 3) through a micromodule M of the inventive matching device, equipped with a piece of radio cable Q.

At the same time, the micromodule M in the best embodiment of the invention is fixed to the part 13 by means of a mounting hole made on the printed circuit board of the micromodule using the bolt 15 of the standard part 13. The free end of the radio cable Q is connected to the input of the vehicle's receiving device.

The micromodule M can also be fixed on the parts of the lock located on the moving part of the body, however, this complicates the laying of the radio cable and increases its length.

The inventive antenna device of the car operates as follows.

The magnetic component of the electromagnetic field of the received signal excites an alternating electric field in a plane perpendicular to the wide side of the slit of the antenna 12 of the car. The presence in the gap of an alternating electric field means that there is a bias current in it, directed perpendicular to the lines of the magnetic field. A node of electric field and voltage is formed at the ends of the gap. The fulness of the electric field and voltage (for the half-wave gap) is formed in the center of the gap, where the transmission line is connected.

The matching device transforms the active high-impedance input impedance of the slot antenna into the cable impedance and compensates for the reactive component of the input impedance of the slot antenna with passive ERE of the bridge circuit. This minimizes the loss of the useful signal.

The claimed technical solution is industrially applicable and suitable both for high-quality reception of infotainment programs of VHF radio stations, and for receiving code parcels of paging transmitting stations.

Literature

1. Magazine "Amateur Radio", No. 11/96, p. 37-38, article "Car body as an antenna."

2. The new polytechnical dictionary. Ch. ed. Ishlinsky A.Yu. M .: Scientific publishing house "Big Russian Encyclopedia", 2000, p. 299.

3. Cars VAZ-2110, VAZ-21102, VAZ-21103, VAZ-2111, VAZ-2112. Guide to repair, operation and maintenance. - St. Petersburg: PeterGrand., 2000, p. 217.

Claims (5)

1. The antenna device of the car, including a slot antenna formed by the gap between the car body and the movable part of the car body, electrically conductive lock parts of the movable body part, the first of which is attached by means of threaded elements to the car body, and the second to the movable part of the car body, a dielectric plate installed between the car body and the first part of the lock, as well as a matching device, including passive electro-radioelements connected to the electric circuit entom, characterized in that the matching device is made in the form of a flat micromodule and placed on the lock part, the front surface of the micromodule printed circuit board is divided into two sections, passive electro-radio elements are placed on the first section and covered with a layer of sealing substance, and the first contact area is made on the second section, a second contact pad is made on the back surface of the printed circuit board, the printed circuit board is provided with a mounting hole, and the indicated contact pads are connected to the electrical terminals of the matching device circuit and are adjacent to the edges of the mounting hole.
2. The antenna device according to claim 1, characterized in that the electrical circuit of the matching device is a matching bridge, in the shoulders of which are included two capacitors and two inductances.
3. The antenna device according to claim 1, characterized in that the matching device is installed on the latch lock of the trunk of the car body.
4. The antenna device according to claim 1, characterized in that the matching device is installed on the latch lock of the rear door of the car body.
5. Antenna device according to any one of claims 3 to 4, characterized in that the matching device is fixed to the parts of the lock by means of a standard threaded element designed to secure the specified parts of the lock.
RU2002133156/09A 2002-12-09 2002-12-09 Motor-car antenna assembly RU2265925C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2002133156/09A RU2265925C2 (en) 2002-12-09 2002-12-09 Motor-car antenna assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2002133156/09A RU2265925C2 (en) 2002-12-09 2002-12-09 Motor-car antenna assembly

Publications (2)

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RU2002133156A RU2002133156A (en) 2004-08-20
RU2265925C2 true RU2265925C2 (en) 2005-12-10

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RU2002133156/09A RU2265925C2 (en) 2002-12-09 2002-12-09 Motor-car antenna assembly

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2461103C2 (en) * 2010-04-26 2012-09-10 Николай Михайлович Легкий Passive label for radio frequency identification system for transportation applications

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Кузов автомобиля в качестве антенны. Радиолюбитель, 1996, №11, с.37-38. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2461103C2 (en) * 2010-04-26 2012-09-10 Николай Михайлович Легкий Passive label for radio frequency identification system for transportation applications

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