JP2019057823A - Immunity test antenna - Google Patents

Abstract

To provide an immunity test antenna that can be connected to a stationary transmitter operated by a commercial power supply and can perform immunity tests stably over a long period of time.SOLUTION: An immunity test antenna 1 having an antenna body 2 for transmitting an electromagnetic wave from the antenna body 2 into the air to test resistance of another electronic device to the electromagnetic wave, includes: a connector 4 for mounting the antenna body 2; a conductor plate 8 to which the connector 4 is attached; a housing 3 for housing the conductor plate 8; a coaxial cable 5 connected to the connector 4; and a ferrite member 7 disposed so as to surround the outer peripheral portion of a coaxial cable 5. The connector 4 is provided at one end of the housing 3. The other end of the housing 3 is provided with a rubber bush 6 for restricting a movement of the coaxial cable 5. The ferrite member 7 is accommodated in the housing 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an immunity test antenna that has an antenna main body, transmits electromagnetic waves from the antenna main body into the air, and tests the resistance of other electronic devices to the transmitted electromagnetic waves (performs an immunity test).

  When performing an immunity test, it is necessary to bring the antenna to be tested close to the distance to the device under test (for example, within a few centimeters) and irradiate the device under test with the electromagnetic wave for testing. A portable wireless device as shown in FIG. 1 is used. At this time, when the area of the irradiation target portion of the test electromagnetic wave is larger than the effective irradiation area of the antenna, it is necessary to move the portable wireless device finely so that the irradiation can be performed without any excess. Moreover, when the irradiation target location extends to a plurality of remote locations, it is necessary to move the portable wireless device for each irradiation target location and repeat the irradiation. The irradiation target part may be in the back of a narrow frontage.

JP 2011-259139 A

  When a portable wireless device is used, there is a problem that the output power level of the electromagnetic wave emitted from the antenna is lowered due to the consumption of the built-in battery when the test takes a long time, and the necessary output power level cannot be stably maintained. In addition, repairs in the event of a failure of a portable radio device may not be easy, or the portable radio device may be discontinued and replacement of a failed part or the portable radio device itself may become impossible during aging. There were problems with performance stability and maintenance.

  The present invention has been made paying attention to this point, and can be connected to a stationary transmitter that is operated by a commercial power source, and can perform an immunity test stably over a long period of time. An object is to provide a test antenna.

  In order to achieve the above object, the invention according to claim 1 includes an antenna main body (2), and immunity for testing the resistance of the other electronic device to the electromagnetic wave by sending the electromagnetic wave from the antenna main body into the air. In the test antenna (1), a connector (4) for attaching the antenna body (2), a conductor (8) to which the connector is attached, a housing (3) for housing at least a part of the conductor, A feeder wire (5) connected to the connector (4); and a ferrite member (7) disposed so as to surround an outer peripheral portion of the feeder wire, wherein the connector (4) includes the housing (3). A restricting portion (6) for restricting the movement of the feeder wire (5) is provided at the other end of the casing (3), and the ferrite member (7) is provided at the casing (3). Characterized by being housed in To.

  According to this configuration, by connecting the feeder line to the output terminal of a transmitter that operates with a commercial power supply, the user holds the casing and brings the antenna body close to the device under test, and a plurality of electromagnetic waves that need to be irradiated. It is possible to easily irradiate the part. An immunity test can be performed stably over a long period of time without the need for a battery and without being affected by the convenience of the manufacturer of the portable wireless device as in the case of using a portable wireless device. . By adjusting the length and shape of the conductor, the voltage standing wave ratio characteristic can be made suitable for immunity testing, and the effective permittivity of the conductor is increased by arranging the ferrite member in the vicinity of the conductor. It is possible to reduce the length of the conductor and reduce the size of the housing. Furthermore, since the ferrite member is accommodated in the housing, the user can easily hold it.

According to a second aspect of the present invention, in the immunity test antenna according to the first aspect, the conductor is a plate-shaped conductor plate (8).
According to this configuration, since the conductor has a plate shape, the voltage standing wave characteristic described above can be easily optimized, and the housing can be downsized.

  The invention according to claim 3 is the immunity test antenna according to claim 2, wherein one end of the conductor plate (8) is bent to form a bent portion (8a), and the connector (4) is connected to the bent portion. It is installed in a part (8a), It is characterized by the above-mentioned.

  According to this configuration, by forming a bent portion on the conductor plate and installing the connector, the conductor plate serving as the ground destination is connected to the ground side of the feeder wire and the portion to be grounded of the antenna body. Can be connected easily.

It is a figure which shows the structure of the antenna for immunity tests concerning one Embodiment of this invention. It is the top view and side view which show the housing | casing internal structure of the immunity test antenna shown in FIG. The side view of the conductor board (8) and connector (4) which are shown in FIG. 2 is shown. It is a figure for demonstrating the usage condition of the antenna 1 for immunity test. It is a figure which shows the modification of the structure shown in FIG.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 are diagrams showing the configuration of an immunity test antenna according to an embodiment of the present invention. 1 is a plan view, and FIG. 2 is a plan view (FIG. 1 (a)) and a side view (FIG. 1 (b)) showing the internal structure of the housing 3 shown in FIG. In FIG. 2, only the housing 3 is shown in cross section.

  As shown in these drawings, an immunity test antenna 1 includes an antenna body 2 for sending electromagnetic waves to space, a housing 3 formed of, for example, a synthetic resin, a connector 4 to which the antenna body 2 is connected, and a housing. The coaxial cable 5 connected to the connector 4 inside the body 3 and one end of the casing 3 (the end opposite to the end where the connector 4 is provided) between the casing 3 and the coaxial cable 5 A rubber bush 6 that is interposed and restricts the movement of the coaxial cable 5, four ferrite members 7 disposed so as to surround the outer periphery of the coaxial cable 5 inside the housing 3, and the connector 4 are attached. And a conductor plate 8. One end of the conductor plate 8 is bent vertically to form a bent portion 8a, and the connector 4 is fixed to the bent portion 8a. Maintenance is improved if the surface of the housing 3 opposite to the surface on which the conductor plate 8 is located is opened and the lid is screwed. Furthermore, if a notch is made on the surface where the rubber bush 6 is provided from the open side up to the hole through which the coaxial cable 5 passes, the coaxial cable 5 to which the connector is connected can be easily mounted.

  The antenna main body 2 is a whip antenna that is mounted on a portable wireless device disclosed in Patent Document 1, and for example, an antenna suitable for transmitting electromagnetic waves of 144 MHz and 430 MHz is used. The antenna main body 2 has a connection portion 2 a formed with a screw thread for connection with the connector 4. The connector 4 is suitable for the connection of a coaxial cable, and is a known connector having an outer conductor portion corresponding to a ground terminal having a thread formed on the outer peripheral portion and a center conductor portion. An insulating member is interposed between the conductor portions.

  By screwing the connecting portion 2 a of the antenna body 2 into the connector 4, the antenna body 2 is connected to one end of the connector 4 and fixed. A connecting portion 5 a provided at the end of the coaxial cable 5 is fixed to the other end of the connector 4. Therefore, the electrical signal transmitted by the coaxial cable 5 is transmitted to the antenna body 2 via the connector 4. The conductor plate 8 is made of a conductor such as aluminum or copper. For example, a cable having an impedance of 50Ω is used as the coaxial cable 5, and the center conductor and the outer conductor of the coaxial cable 5 are connected to the center conductor portion and the outer conductor portion of the connector 4, respectively.

  3 shows a side view of the conductor plate 8 and the connector 4, and FIG. 3 (b) is a side view seen from the right direction of FIG. 3 (a). A screw thread is formed in the connection portion to which the coaxial cable 5 of the connector 4 is connected, and the connection portion 5a of the coaxial cable 5 is screwed and fixed to this connection portion. The connector 4 is fixed to the bent portion 8a of the conductor plate 8 by screws (not shown), for example.

  FIG. 4 is a diagram for explaining how the immunity test antenna 1 is used. The coaxial cable 5 is capable of outputting test electromagnetic waves and is connected to an output terminal of a transmitter 20 that operates on a commercial power source. When the user holds the housing 3 and approaches the device under test 10, the resistance of the device under test 10 against the test electromagnetic wave transmitted from the immunity test antenna 1 is tested. For example, when the device under test 10 is a radio mounted on a vehicle, the tolerance means whether or not the level of the test electromagnetic wave superimposed on the broadcast received sound is below a reference level, or in normal operation. It means no trouble.

  As described above, according to the immunity test antenna 1 of the present embodiment, by connecting the coaxial cable 5 to the output terminal of the transmitter 20 operated by a commercial power source, the user holds the casing 3 and the antenna main body. 2 can be brought close to the device under test 10 to easily irradiate a plurality of places that require electromagnetic wave irradiation. It does not require a battery and is not affected by the convenience of the manufacturer of the portable wireless device as in the case of using the portable wireless device, and can perform immunity tests stably over a long period of time. Become. By adjusting the length and shape of the conductor plate 8, the voltage standing wave ratio characteristic can be made suitable for the immunity test. By arranging the ferrite member 7 in the vicinity of the conductor plate 8, the conductor plate 8 The effective dielectric constant concerning this can be raised, the length of the conductor plate 8 can be shortened, and the housing | casing 3 can be reduced in size. Furthermore, since the ferrite member 7 is accommodated in the housing | casing 3, it becomes easy for a user to hold | maintain.

  Further, by using the conductor plate 8, the voltage standing wave characteristic can be easily optimized, and the housing 3 can be downsized. Further, by forming a bent portion 8a on the conductor plate 8 and installing the connector 4, the grounding side (external conductor) of the coaxial cable 5 and the portion to be grounded of the antenna body 2 serve as a grounding destination. Can be easily connected (connected to the outer conductor of the coaxial cable 5).

  The present invention is not limited to the embodiment described above, and various modifications can be made. For example, as shown in FIG. 5A, a bent portion 8b may be formed on the conductor plate 8 on the opposite side of the bent portion 8a. Further, as shown in FIG. 5B, the bent portion 8a of the conductor plate 8 is deleted so that the conductor plate 8 is only a portion extending along the bottom of the housing 3, and the conductor plate 8 and the external conductor portion of the connector 4 are connected. May be connected by a conductor wire. Further, as shown in FIG. 5C, the conductor plate 8 may be deleted, and the conductor wire 9 may be provided so as to extend to the bottom portion of the housing 3 so as to be connected to the external conductor portion of the connector 4. Furthermore, as shown in FIG. 5D, a part of the conductor plate 8 may extend outside the housing 3. In the example shown in FIG. 5 (d), the bent portion 8 b is located outside the housing 3.

  In the embodiment described above, the cross-sectional shape of the housing 3 is rectangular, but is not limited thereto, and may be a polygon such as a square, a circle, or a hexagon. Further, the number of ferrite members 7 is not limited to four, and can be appropriately changed as necessary.

  Further, the test may be performed by fixing the case 3 to a stand or the like without holding the case 3 by hand. In this case, it is better to optimize the shape and length of the conductor plate 8 in a fixed state.

1 Antenna for immunity test 2 Antenna body 3 Housing 4 Connector 5 Coaxial cable (feeder wire)
6 Rubber bush (Regulatory part)
8 Conductor plate (conductor)

Claims (3)

In the immunity test antenna for testing the resistance of the other electronic device to the electromagnetic wave by sending an electromagnetic wave from the antenna body into the air,
A connector to which the antenna body is attached, a conductor to which the connector is attached, a housing that accommodates at least a part of the conductor, a feeder line connected to the connector, and an outer periphery of the feeder line. Provided ferrite member,
The connector is provided at one end of the casing, a regulating portion for regulating movement of the feeder line is provided at the other end of the casing, and the ferrite member is accommodated in the casing. Antenna for immunity test.   The immunity test antenna according to claim 1, wherein the conductor is a plate-shaped conductor plate.   The immunity test antenna according to claim 2, wherein a bent portion is formed by bending one end of the conductor plate, and the connector is installed in the bent portion.

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