JPS61214803A - Radio equipment - Google Patents

Abstract

PURPOSE:To suppress the influence of electromagnetic disturbing waves from the external by insulating the feeder waveguide part of an antenna projected from a frame ground part from a signal ground part with respect to DC. CONSTITUTION:A radio equipment body case 1 is subjected to signal ground SG. A frame ground enclosure 2 is provided to surround this body case 1 and is subjected to frame ground FG. A primary radiator 3 projected from the frame ground enclosure 2 is not subjected to signal ground SG because a waveguide 12 is provided with an insulating part 11. The antenna side of the waveguide 12 is connected to a reflection mirror 4 and is subjected to frame ground FG. Since the signal ground part is not on the outside of the frame ground enclosure, the influence of electromagnetic disturbing waves from the external is suppressed. In the insulating part, parts of the waveguide 12 in taper parts of a dielectric 13 are matching parts, and a DC and a low frequency are insulated but necessary microwaves are propagated.

Description

[Detailed Description of the Invention] [Summary] A frame ground casing that galvanically insulates a feeder waveguide of a primary radiator in a parabolic antenna or a Cassegrain antenna from a signal ground of a radio device main body, and surrounds the radio device main body. outside.

By preventing the signal ground from coming out, EML,
A wireless device with improved ESD resistance is disclosed.

[Industrial application field]

The present invention relates to a wireless device having a parabolic antenna, a Cassegrain antenna, etc., and particularly to a wireless device in which the antenna is substantially shielded so as not to be affected by electromagnetic interference waves from the outside.

Wireless devices that transmit and receive digital signals, which have become widely used in recent years, have 1. Received data is sometimes input as is into a computer for data processing, and it is desired to reduce code errors due to noise as much as possible.

[Conventional technology and problems]

FIG. 3 shows an example of a wireless device using a conventional parabolic antenna.

In the figure, ■ represents the main body case of the wireless device, 2 represents the frame ground casing, 3 represents the parabolic reflector for the primary radiator 34 that radiates microwaves from the waveguide, and 5 represents the radome that protects the antenna.

Generally, in electrical equipment, an internal conductor is shielded with an external conductor, and this is used as a signal ground SG. However, if external electromagnetic interference is coupled to this signal ground SG.

In equipment where it is required to reduce the error rate, as it may cause malfunction of the equipment, a signal ground SG is added.
is covered with a frame ground FG insulated from this,
Double shielding is in place.

For example, in the case of a conventional wireless device as shown in FIG.
The wireless device main body case 1 is connected to the signal ground SG,
This is shielded by a frame ground casing 2, and the frame ground casing 2 is used as a frame ground FG. - The feed horn of the secondary radiator 3 is connected to the signal ground SG.
Therefore, the parabolic reflecting mirror 4 often becomes the frame ground.

However, conventionally, even though the wireless device main body case 1 is shielded by the frame ground casing 2, electromagnetic interference waves may be mixed in and bit errors may occur.

One of the reasons for this is that with an antenna like the one shown in Figure 3,
This is believed to be because the primary radiator 3, which serves as the signal ground SG, is electromagnetically exposed to the outside and is therefore easily affected by electromagnetic interference waves from the outside. In particular, recently, wireless devices have been placed in offices where data terminals are installed, rather than being placed outdoors, and people frequently approach and move away from the devices, so clothes, etc. The static electricity charged in the signal ground SG is discharged, and a relatively low frequency electromagnetic wave is generated by the spark.
There is a problem in that the signal is coupled to the primary radiator 3, which may cause bit errors in data transmission and reception.

[Means for solving problems]

The present invention aims to solve the above problems, and the portion of the feeder waveguide that protrudes from the frame ground casing.

By electrically insulating the radio device from the signal ground of the main body case, it is prevented from being affected by external electromagnetic interference waves such as artificial noise. That is, 1) the radio device of the present invention divides the waveguide to the -order radiator into two, 2 connects the two waveguides via, for example, a dielectric line, and connects the radio device transmitting/receiving section and the radiator through this insulating section. is DC-insulated, and the signal ground portion is prevented from protruding outside the frame ground casing.

[Effect]

According to the present invention, the portions protruding from the frame ground case, that is, the -order radiator and the feeder waveguide, are connected to the wireless device main body case 1 serving as the signal ground and the insulating portion such as the dielectric line to prevent direct current Because it is insulated, direct current and low frequency interference waves generated by external sparks are absorbed by the frame ground and do not reach the signal ground of the wireless device itself, preventing malfunctions.

An embodiment will be described below with reference to one drawing.

〔Example〕

FIG. 1 shows an example of a wireless device using a parabolic antenna, which is an embodiment of the present invention, and FIG. 2 shows an example of an insulated waveguide, which is a specific example of the insulating section shown in FIG.

In FIG. 1, numerals 1 to 5 correspond to those shown in FIG. Reference numeral 11 represents a direct current and low frequency insulator, 12 represents a waveguide that supplies microwaves from the radio transceiver to the primary radiator 3, and 13 represents a dielectric waveguide.

The wireless device main body case 1 accommodates a transmitter/receiver section of the wireless device, and the wireless device main body case 1 serves as a signal ground SG. A frame ground casing 2 is provided so as to surround this wireless device main body case 1, and the frame ground casing 2 is insulated from the wireless device main body case 1 to serve as a frame ground FC. The parabolic reflector 4 is electrically connected to the frame ground casing 2, thus forming a 9 frame ground FC.

In the conventional case, the primary radiator 3 protruding from the frame ground casing 2 is normally provided as an extension of the wireless device main body case 1, so it is a signal ground SG, but in the present invention, the waveguide 12 is provided with an insulating section. 11 is provided, it does not serve as a signal ground SG, but the antenna side of the waveguide 12 is electrically connected to the parabolic reflection @4 and serves as a frame ground FC.

The insulating section 11 is constituted by an air gap or an insulated waveguide by a dielectric waveguide 13 as shown in FIG. 2, for example.

In the insulated waveguide shown in FIG. 2, a part of the waveguide 12 with a rectangular or circular cross section is cut away in the frame ground case 2, and a tapered dielectric material is inserted between the two to create a dielectric This constitutes a body waveguide 13. For example, Teflon is used as the tapered dielectric material.

As a result, the separated part of the waveguide 12 becomes a DC insulation part, and the tapered part of the dielectric material divides the waveguide 1 into two parts.
This is the matching part of 2. This matching part.

Since it has a so-called dielectric rod antenna structure on both sides, it is insulated from direct current and low frequencies.

The necessary microwaves will be propagated. That is, the transmitting/receiving section of the wireless device and the primary radiator 3 of the antenna are coupled in the dielectric line mode in the dielectric waveguide 13, so that only high frequencies are transmitted.

Although the embodiment shown in FIG. 1 uses a parabolic antenna, it can be similarly applied to a case using a Cassegrain antenna.

〔Effect of the invention〕

As explained above, according to one aspect of the present invention, the signal ground portion does not come out of the frame ground casing.
l, ESD resistance is improved 9 e.g.

This makes it possible to reduce the influence of artificial noise caused by static electricity sparks from clothing, etc.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention, Fig. 2 shows an example of an insulated waveguide which is a specific example of the insulating part shown in Fig. 1, and Fig. 3 shows an example of a radio device using a conventional parabolic antenna. . In the figure, 1 is the main body case of the wireless device, 2 is the frame ground casing, 3 is the primary radiator 34 is a reflector, 5 is the radome, 1
1 is an insulation part, 12 is a waveguide, 13 is a dielectric waveguide, SG
represents a signal ground, and FC represents a frame ground.

Claims (1)

[Claims] A wireless device that transmits and receives microwaves includes: a wireless device body case (1) in which a wireless device transmitting and receiving section is housed and connected to a signal ground; and an insulated wireless device body case (1); and a frame ground casing (2) that surrounds the wireless layer device main body case (1); ) and a waveguide (12) on the antenna side in a direct current manner, and at least the feeder waveguide portion of the antenna protruding from the frame ground housing (2) is provided with A wireless device characterized by being configured to be insulated.