JPH08222924A - Antenna structure - Google Patents

Abstract

PURPOSE: To provide a simple antenna structure by which the assembling work is simplified, number of components is reduced, a radio wave is received in an excellent way and a magnetic effect from other equipments is blocked. CONSTITUTION: One of connection terminals 34 of a connector 32 fitted to a printed circuit board 33 for purposes of power supply or the like is made to be an idle terminal. The idle terminal is used for an antenna 34a and a signal received is fed to a receiver via a circuit pattern 35 and an extension coil 37.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna structure for receiving radio waves, and more particularly to an antenna structure suitable for use in a remote control system for remotely controlling a vehicle locking / unlocking control device by communicating radio signals.

[0002]

2. Description of the Related Art In recent years, with the advancement of car electronics, high-end automobiles and the like have come to be unlocked and unlocked by remotely controlling, for example, a locking / unlocking control device mounted in the vehicle from a portable wireless device outside the car. There is. In such a remote control system, the locking / unlocking control device is equipped with a receiving antenna, and the frequency used for remote control operation is
The frequency band of 60 MHz is used in Japan and 3 overseas.
The frequency band of 00 MHz is generally used.

A conventional antenna structure will be described below. The antenna structure 1 shown in FIG. 3 has a frequency of 60 MHz.
It is applied when receiving band radio waves.
That is, in this antenna structure 1, while the socket 3 dedicated to the antenna is provided on the printed circuit board 2 of the receiver, the plug 4 which is detachably inserted into the socket 3 dedicated to the antenna is connected.
In addition, the antenna wire 7 is connected via the coaxial cable 5 and the matching circuit board 6. In addition,
The terminal 8 of the socket 3 for exclusive use of the antenna is connected to the circuit pattern 9, and the circuit pattern 9 is connected to the receiver, for example, the receiving circuit of the locking / unlocking control device. A grounding lead wire 11 and a terminal 12 are connected to the matching circuit pattern 6. Further, the length of the antenna wire 7 is set to, for example, λ / 4 (wavelength) of the frequency used.

An antenna structure 21 shown in FIG. 4 is a printed circuit board 22 for a receiver, on which an antenna 23 is provided by a jumper wire, and is applied when receiving a radio wave in a frequency band of 300 MHz. When the frequency is 300 MHz, the antenna length with the best reception efficiency is 15 cm to 20 c.
m, and an antenna may be formed on the printed circuit board 22 with a circuit pattern. A connector 24 for power supply and signal transmission / reception is attached to the printed circuit board 22, and a wire harness is detachably connected to the connector 24 via a mating connector (not shown).

[0005]

However, in the antenna structure 1 of FIG. 3, the socket 3 for the antenna, the plug 4, the coaxial cable 5, the matching circuit board 6 and the 1/4.
Numerous components are needed, such as the wavelength length of the antenna wire 7. In addition, there are many labor-intensive operations in assembling, such as terminal treatment of the coaxial cable 5, connection between the coaxial cable 5 and the antenna wire 7, connection between the coaxial cable and the receiver, and the like. Further, there are various problems that the wiring work of the antenna wire 7 inside the vehicle is required, the number of parts is large, and the assembly is troublesome.

Further, in the antenna structure 21 of FIG. 4, the antenna length cannot be shortened in consideration of reception efficiency. Therefore, if the antenna 23 is provided on the diagonal line of the printed circuit board 22 as shown in the figure, the printed circuit board 22 may be unnecessarily enlarged or the connector 2
The mounting positions of mounting parts such as 4 will be restricted. It should be further noted that in a system of 300 MHz band, if the entire printed circuit board 22 is shielded by a metal shield case or the like in order to eliminate magnetic influences on other devices or magnetic influences from other devices, reception becomes impossible. Therefore, the metal shield case cannot be used. Therefore, the printed circuit board 22 is restricted in its installation position in order to prevent a magnetic influence with other devices. In other words, modern automobiles are made electronic as mentioned above, and neither of the mounted devices should be affected by magnetic influences or pulse noises, nor should they be affected. However, if the shield is not possible, it will be very difficult to take measures.

The structure of the loop antenna is shown in the vehicle locking / unlocking control device disclosed in Japanese Unexamined Patent Publication No. 62-78379. The content of the loop antenna is intended to substantially expand the receiving range of the loop antenna. However, the problems of the antenna structure described above are not solved. The present invention is simple in structure and assembly work, and has a small number of parts.
Moreover, it is an object of the present invention to provide an antenna structure capable of excellently receiving radio waves and preventing interference with other devices.

[0008]

In order to achieve the above object, an antenna structure according to the present invention is configured such that any one of the connection terminals of a connector mounted on a printed board is an empty terminal, and one end of the empty terminal is The antenna is characterized in that it is connected to a receiver to form an antenna for receiving radio waves of a desired frequency. Further, the antenna structure according to the present invention may be characterized in that an inductor is provided between one end of a vacant terminal forming the antenna and the receiver in correspondence with a frequency to be received.

[0009]

The vacant terminal of the connector mounted on the printed circuit board for power supply and signal transmission is used as an antenna, and the received signal received at the vacant terminal is supplied to the receiver through the circuit pattern. Even when the printed circuit board is shielded by a metal shield case or the like, the open end of the connector, that is, the end into which the other connector terminal is inserted is open and is not shielded as an antenna element, so that good reception can always be performed. Therefore, by shielding the printed circuit board, it is possible to prevent the influence of noise and the like generated from other devices and prevent interference with other devices.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an antenna structure according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a main part according to an embodiment of an antenna structure according to the present invention. In the figure, an antenna structure 31 is constructed by utilizing a connector 32 that is originally used for power supply, signal transfer, and the like. That is, the connector 3 is attached to the receiver printed circuit board 33.
2 is attached, and this connector 32 is a so-called female connector, and is attached to the printed board 33 with a connection end 32a into which a male connector (not shown) is inserted facing the outside of the printed board 33. .

The connector 32 has a large number of male connection terminals 34 led out from its rear end. In this embodiment, one of them (second from the right end in the figure) is used as the antenna 34a. . Therefore, the female connector terminal of the male connector to be connected, which corresponds to the antenna 34a, is used as an empty terminal, and the wire harness or the like is not connected. The connection terminal to be the antenna 34a is the printed circuit board 3
3 is connected to the circuit pattern 35 formed in 3 by soldering or the like, and the circuit pattern 35 is connected to the circuit pattern 36 on the receiver side via the inductor 37. That is,
Since the length of the antenna 34a is shorter than λ / 4 of the received radio wave, the inductor 37a is used for matching.
Is provided. In the figure, there is a receiver (not shown) on the front side (left side), and the received signal received by the antenna 34a is the circuit pattern 35, the inductor 37, and the circuit pattern 3.
6 to the receiver. The inductor 37 can be omitted when the frequency of the radio wave to be received is high.

FIG. 2 shows. FIG. 6 is a perspective view showing another embodiment of the antenna structure according to the present invention. In the figure, the antenna structure 41 according to this embodiment differs from the embodiment shown in FIG. 1 above in the form of the inductor. That is, in this embodiment, the inductor 37A is
A circuit pattern is formed in advance by the inductance component of the printed board 22. Therefore, only by connecting the connection terminal, which will be the antenna 34a, to the circuit pattern 35, matching can be achieved with a receiver (not shown). Since the other parts except the inductor 37A are provided in the same structure as the previous embodiment, the same reference numerals are used and the description thereof is omitted.

In the antenna structures 31 and 41 of the above-mentioned respective embodiments, electric wires and connectors for antennas, coaxial cables, etc. are not necessary at all, and empty terminals of the connector 32 to be attached for other purposes are replaced by the circuit pattern 35. By connecting to, it becomes possible to receive radio waves of a desired frequency. In addition, since the rod-shaped or plate-shaped antenna seen in the conventional structure is not required, the size and shape of the printed circuit board 33 are not limited, and downsizing is possible and the degree of freedom in design is improved. There are various effects. Particularly, in the case where the inductor 37A is formed in the circuit pattern, the number of parts to be attached later is reduced and the workability is improved.

It should be further noted that the entire printed circuit board 33 can be received even if it is shielded with a metal shield case or the like. Further, the connector 32 has a construction in which a metal connection terminal 34 is embedded in a synthetic resin housing, and the synthetic resin does not affect the transmission and reception of radio waves. Therefore, even if the printed circuit board 33 is shielded, radio waves are well received, radiation from the receiver can be suppressed, and influences from other devices can be prevented and interference with other devices can be reduced. You can

[0015]

As described above, in the antenna structure according to the present invention, one connection terminal of the connector mounted on the printed circuit board for supplying power is used as an empty terminal, and this empty terminal is used as the antenna. The received signal is supplied to the receiver through a circuit pattern and an inductor provided as necessary. That is, since the antenna uses the connection terminals of the connector attached for other purposes, no special member for the antenna is required and no assembly work is required. Moreover, even if the printed circuit board to which the connector is attached is shielded by a metal plate or the like, one end of the connector is open, so there is no reduction in reception efficiency, and there is no magnetic influence on other equipment or magnetic influence from other equipment. The influence can be suppressed.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of an antenna structure according to the present invention.

FIG. 2 is a perspective view showing another embodiment of the antenna structure according to the present invention.

FIG. 3 is a perspective view showing an example of a conventional antenna structure.

FIG. 4 is a perspective view showing another example of a conventional antenna structure.

[Explanation of symbols]

 31, 41 Antenna structure 32 Connector 32a Connection end 33 Printed circuit board 34 Connection terminal 34a Antenna 35, 36 Circuit pattern 37, 37A Inductor

Claims (2)

[Claims] 1. An antenna for receiving a radio wave of a desired frequency by making one of connection terminals of a connector attached to a printed circuit board for another purpose an empty terminal and connecting one end of the empty terminal to a receiver. An antenna structure characterized by the above. 2. The antenna structure according to claim 1, wherein an inductor is provided between one end of a vacant terminal forming the antenna and a receiver in correspondence with a received frequency.