JPS61129903A - Reflection mirror antenna system - Google Patents

Abstract

PURPOSE:To prevent deterioration of a characteristic of an antenna due to snow by providing a hole having a diameter sufficiently smaller than the wavelength to a reflecting plate of a primary radiator equipped with a radome and providing a hot air generating device to the rear side. CONSTITUTION:The reflection mirror antenna consists of the primary radiator comprising a reflection mirror 10 and a helical antenna 12 with the reflecting plate 14 covered with the radome 15. The holes 16, 16' having a diameter having a smaller diameter than the wavelength are provided to the reflecting plate 14 and a tube 21 provided with a heater 19 and a fan 20 driven by a motor 17 and circulating hot air is provided at the rear side. When snow falls, a controller 18 activates the motor 17 and the heater 19. As a result, warm air is circulated in the radome 15 and melts adhered to the upper part of the radome 15 so as to prevent adhesion of snow to the radome.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reflector antenna device (2) that prevents characteristic deterioration due to snow adhering to a primary radiator.

[Technical background of the invention and its problems]

In recent years, many reflector antennas have been used for relaying microwave lines, general communications using artificial satellite C2, and ground stations for TV broadcasting. Further, a reflecting antenna such as a parabolic antenna is used as a receiving antenna for satellite broadcasting.

For example, an example of a reflector antenna is a parabolic antenna with a center feeder shown in Figure IJJ4.

In FIG. 4C2, 1 is a reflecting mirror, 2 is a primary radiator, and 3 is a support supporting the primary radiator.

Conventionally, when used in a parabolic antenna such as a parabolic antenna, the accumulation of the primary radiator caused a decrease in gain and a deterioration in interdigitation.

As a means to prevent this characteristic deterioration, a method of attaching a radome 5 on which the primary radiator is mounted, as shown in FIG. 5, is widely used.

Radomes are effective in regions with a small amount of snowfall, but in regions with heavy snowfall, even if the radome 5 is used, snow will accumulate on the radome 5 itself, and continuous snowfall (2) The snow that has adhered to the radome will become a snow mass, and the radome 5 itself will accumulate. It covers 5.

In the case of a horn antenna, as shown in FIG. 6, there is a method of blowing warm air 64 onto the radome 62 attached to the opening of the horn antenna 61 from above the opening with a nozzle to remove snow.

However, the radome attached to the helical antenna with a reflector (2) has a hemispherical or cylindrical shape as shown in Figure 7 (-). In order not to deteriorate the characteristics of the antenna (2), there must be two ports on the back side of the reflector, and in order to blow warm air over the entire V-dome (= is at least 2114), in order to blow evenly (2 is 4
It is necessary to have an outlet in one direction or more. This is a structural C-duplex, which causes a blocking problem in the case of a center feed, and causes deterioration of the overall antenna characteristics.

In addition, when using a large radome, hot air is blown to the top (secondly, it is necessary to increase the output of hot air, which increases power consumption and is not economical. As the temperature of the antenna becomes lower, moisture may adhere or freeze, which also deteriorates the characteristics of the antenna.

[Purpose of the invention]

The present invention improves the drawbacks of the conventional device described above.
An object of the present invention is to provide a reflector antenna device capable of preventing deterioration of antenna characteristics due to snow adhering to a primary radiator.

[Summary of the invention]

In the present invention, a reflector is provided by attaching a radome to a primary radiator consisting of a helical antenna, and making two or more holes with diameters sufficiently small compared to the wavelength in the reflector of the primary radiator, and forming holes on the back side of the reflector. The present invention provides a reflector antenna device equipped with a hot air generator between the holes.

In addition, the present invention provides a method for attaching a sufficiently thin dielectric material to the outer side (-1 wavelength) of a radome attached to a helical antenna with a reflector so that the dielectric material is in close contact with the radome, and rotating the dielectric plate. It is equipped with a device.

〔Effect of the invention〕

According to the present invention (2), it is possible to prevent characteristic deterioration of a reflector antenna due to snow C2.

In particular, according to the first invention, since hot air is circulated, it is efficient, consumes less power, and is economical. Since the warm air generator is smaller than the reflector of the primary radiator and is attached to the back, there is no locking problem, and the antenna characteristic C2 does not affect it. Furthermore, the configuration
The structure is simple.

According to the second invention, since the dielectric plate rotating device is attached to the back side of the reflecting plate of the primary radiator, there is no blocking problem and it does not affect the antenna characteristics. The configuration and structure are simple. Furthermore, since the dielectric plate is mechanically rotated, it is efficient and consumes less power due to dual hot air C, making it economical.

Furthermore, in the case of two-way warm air, there is a problem of moisture adhesion, but in this case there is no problem.

[Embodiments of the invention]

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an embodiment of the first invention, in which a reflector 10, a support 11 of a primary radiator, and a helical antenna 1 are shown.
2, reflector 14, radome 15, motor 17 and 7-an 2
0 and the heater 19 and the motor 17 and the device 18 for controlling the heater 19 and the hole 1 with a smaller diameter (2) than the wavelength
It consists of a tube 21 that blows 6 and 1σ and circulates hot air.

When this parabolic reflector antenna is used for 14 hours, snow begins to accumulate on the upper part of the radome 15 and becomes a snow mass.

Therefore, when 1 starts to fall, the control device 18 is activated to rotate the motor I7 and at the same time cause a magnetic current to flow to the heater 19.

When the motor 17 rotates, the fan attached to the motor shaft also rotates. He was sent into the room.

Warm air collects at the top of the radome, and cool air is drawn into tube 21 through hole 16'.

Gradually C2, a chain of these air flows occurs. Therefore, the spirits adhering to the top of the radome are combed out by the hot air inside the radome, and snow does not accumulate on the radome.

By using this invention, it is possible to prevent a decrease in the gain of the reflector antenna and deterioration of the directivity due to snow that adheres to the primary radiator (secondary radiator).

Also, since hot air is linked, it is efficient and consumes less electricity, making it economical.

Since the hot air generator is smaller than the reflector of the primary radiator and has a rear side C2, there is no problem of blocking.

Composition, +11 road is also a temporary car.

In this invention, the helical antenna 12 is an antenna element of a primary radiator, but it is a dipole antenna.

Similar effects can be obtained with monoball antennas, microstrip antennas, spiral antennas, etc.

Moreover, several reflecting plates 14 (two holes t't+) may be provided.

FIG. 2 shows an example of the present invention.

The same effect as described above can be obtained by using the hot air generator described above to send hot air between the 21 radomes 25 and the radomes.

FIG. 8(,) shows an embodiment of the second invention,
Reflector 301 Helical antenna primary radiator 31 with reflector
．． The pillar 32 that supports the primary radiator 11 and the radome attached to the primary radiator are attached to the outside of the radome. (2) A device 35 for rotating along the
It is more established.

The present invention (Second, method C for preventing characteristic deterioration of a reflector antenna due to snow) will be explained using two specific examples.

As a specific example of the present invention, two center-feed parabolic reflectors (two are considered) shown in FIG.

Fig. 3C When using the two center-fed parabolic reflector antennas during snowfall, snow will adhere to the radome surface and gradually (
It becomes a double lump.

Therefore, when the blindness begins to fall, a dielectric plate blade attached to the outside of the radome is rotated by the device 35 along the shape C of the radome.

The device 35 is integrated with a motor 40, a gear 41 attached to the motor 40, and a thin dielectric plate 34 with a wavelength ζ in close contact with the radome, as shown in FIG. 8(b).
The remaining gear 42 and a device 43 for driving and controlling the motor
It is a device consisting of.

This device 35 is installed on the back side of the reflecting plate 36 (two sides are installed).

Using the above device, when the thin dielectric plate 34 that is in close contact with the radome 33 is rotated along the radome, the snow deposited on the radome surface can be removed.
Snow will no longer stick to it.

The reason for using a dielectric plate that is sufficiently thin compared to the wavelength is as follows.During clear weather other than snowfall, the device 14 for removing snow is exposed to sunlight and is in close contact with the radome. Therefore, the material used for this device should be one that has good weather resistance and does not change in quality.

The dielectric material is made of a material such as rubber (which satisfies the above requirements in two dimensions.Also, a certain degree of strength is required, so rubber etc. require a reinforcing material such as metal, but dielectric materials require a certain degree of strength. Not necessary.

If the dielectric magnetic material 34 is not thin compared to the wavelength, the radio waves emitted from the primary radiator will be reflected by this dielectric plate, causing power loss and deterioration of the vswn and radiation characteristics of the helical antenna 37.

Furthermore, the dielectric 34 always covers a part of the radome, and the dielectric 34 is fixed during clear weather, so 1
Electrical properties of the radiator (giving rise to two asymmetries)

Therefore, in order to eliminate the deterioration of the characteristics of the primary radiator due to the dielectric 34, the dielectric 34 needs to be sufficiently thin over the wavelength ζ.

By using this invention, it is possible to prevent a decrease in the gain of a reflector antenna and deterioration of directivity due to snow.

Since the dielectric plate rotation device is attached to the back side of the reflecting plate of the primary radiator, there is no problem of blocking and it does not affect the characteristics of the antenna (second side influence).

Also, it is easy to configure and install.

Mechanical: Because it rotates a dielectric material, it is efficient and economical as it consumes less power than hot air.

A similar effect can be obtained with an offset-fed antenna instead of a center-fed antenna.

It's a dipole antenna, not a helical antenna.

Similar effects can be expected with monoball antennas, spiral antennas, etc.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the first invention, FIG. 2 is a diagram showing a modification thereof, FIG. 3 is a diagram showing an embodiment of the second invention,
FIG. 4, FIG. 5, FIG. 6, and FIG. 7 each show a conventional example. 10...Reflector 11...Primary radiator support column 12...
Helical antenna 14... Reflector 15... Radome 16... Hole 17... Motor 18.
...Control device 50...Radome 51...Reflector 52...Helical antenna representative Patent attorney Noriyuki Chika (and one other person) Fig. 1 (Q-) tb> Fig. 2 (b) 4θ (C) Figure 4 Figure 6 Figure 1 Figure 7 Figure 1 SI

Claims (2)

[Claims] (1) Consists of a helical antenna with a reflector and a reflector plate1
In the antenna, a radome is attached to the primary radiator, and a hole having a diameter sufficiently small compared to the wavelength is inserted into the reflecting plate of the primary radiator. A reflector antenna device characterized in that a hot air generator consisting of a motor, an electric heater, and a fan is provided between the holes on the reflector plate on the side where the antenna element is not present. (2) 1 consisting of a helical antenna with a reflector and a reflector
In a reflector antenna consisting of a secondary radiator and a support supporting the primary radiator, a radome is attached to the primary radiator, and a dielectric plate having a thickness sufficiently thin compared to the wavelength is attached to the outside of the radome. Attach it in close contact with the
A reflector antenna device further comprising a device for rotating the dielectric plate.