JPS6365162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reflector antenna using a part of a paraboloid of rotation as a reflecting mirror surface, and in particular to a reflector antenna that can reduce the effects of ice and snow accretion on the antenna. It is intended to provide an antenna.

As is well known, the most widely used antennas used in microwave communication are parabolic antennas, Cassegrain antennas, etc., in which a part of a paraboloid of revolution is a reflecting mirror surface. When the antenna is installed and used in a cold region, etc., the antenna has the disadvantage that if ice or snow adheres to it, the transmission and reception of microwaves will be hindered by the ice or snow.
Even on parabolic antennas, the level of the microwave signal due to icing and snow can drop by several tens of decibels, and this icing and snow cannot be ignored to ensure good communication. be.

Conventionally, in order to prevent these drawbacks, a radome 2 is installed in front of the opening of the reflective mirror surface 1, as shown in FIG.
Attempts have also been made to install a heater on the reflecting mirror surface. The prevention means using the radome has the disadvantage that the characteristics of the antenna are deteriorated by reflection and attenuation by the radome itself, and by ice and snow adhering to the radome. Furthermore, the radome itself is expensive, and the antenna equipped with the radome is large in size, and must have mechanical strength that can withstand wind pressure, icing, and snow accumulation. figure,
It became increasingly expensive. In addition, the method of installing a heater on the reflective mirror surface uses the heater to control the surface temperature of the reflective mirror surface to prevent icing and snow buildup, but this method also reduces the cost of installing the heater and the power consumed by the heater. It had major drawbacks.

The present invention has been made in view of these points, and a mechanical micro-vibration generator is disposed on the back side of the reflecting mirror surface of a reflector antenna, and the mechanical micro-vibration generated by the mechanical micro-vibration generator is utilized. The purpose of this invention is to provide a good antenna at a low cost that prevents ice and snow from accumulating on the antenna.

The present invention will be explained below with reference to the drawings. As shown in FIG. 2, a mechanical micro-vibration generator 3 is installed on the back surface of the reflector antenna, and the mechanical micro-vibration generated by the device 3 is effectively transmitted to the antenna from the back surface of the reflector 1 of the antenna. arranged in shape. 4 is a primary radiator of the antenna (in the case of a parabolic antenna), and 5 is a support base. Now, when ice or snow adheres to the antenna, the mechanical vibration generator 3 is operated and the generated mechanical vibrations are transmitted from the back of the reflector to the ice and snow areas on the antenna. Due to the slight vibrations, the ice and snow that has adhered to it is dispersed from the place where it has adhered. Sometimes, when ice or snow accretion occurs on a reflective mirror surface, this mechanical vibration has a discrete effect on icing or snow accumulation, and the effect is caused by the ice or snow sliding on the reflective mirror surface under its own weight. It has the function of increasing the sliding effect.

By continuously operating the mechanical micro-vibration generator 3 in this manner, it is possible to continuously prevent the antenna from icing and snow. It goes without saying that the magnitude and frequency of the mechanical vibrations are such that they do not affect the performance of the antenna.

Further, as shown in FIG. 3, a change in the level of the signal received by the antenna is detected by a detection device 7 installed together with the reception device 6, and the detection output is used as a control signal to control the micro-vibration generator 3. Turning the micro-vibration generator 3 on and off, as well as the magnitude and frequency of the generated mechanical micro-vibration, can be controlled to most effectively prevent icing and snow accretion. . Furthermore, it is known that the state of icing and snowing varies greatly depending on the weather conditions, so changes in weather conditions such as temperature, wind speed, and snowfall are detected, and the output of the detection is used to It is also possible to control the vibration generator 3. In addition, in the case of a large antenna, when multiple micro-vibration generators are installed on the back surface of the reflector, it is possible to It is also possible to operate the micro-vibration generator to effectively prevent icing and snow accumulation depending on the location on the rear surface of the antenna reflecting mirror of the vibration generator. However, when the antenna is installed at a high elevation angle, operating the mechanical micro-vibration generator may work to concentrate ice or snow that has adhered to the entire antenna onto a part of the antenna's reflective mirror surface. be. In this case, as shown in FIG. 4, by attaching a cover 8 or a radome to the antenna and transmitting the vibrations generated by the mechanical micro-vibration generator 3 to the antenna cover 8 or the radome, It is also possible to provide an antenna that prevents icing and snow from accumulating on the radome.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without changing the gist of the present invention.

As described above, according to the present invention, a device for generating minute mechanical vibrations is provided at the lower part of the reflecting mirror surface, and the vibration is generated in accordance with the reception level from the antenna. This makes it possible to most effectively remove portions that tend to accumulate with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a side view of a reflector antenna in a conventional example, and FIGS. 2, 3, and 4 are side views of reflector antennas in embodiments of the present invention. DESCRIPTION OF SYMBOLS 1...Reflecting mirror surface, 2...Radome, 3...Mechanical micro-vibration generator, 4...Primary radiator, 5...Support stand, 6...Receiving device, 7...Detecting device, 8...
antenna cover.

Claims (1)

[Claims] 1. It has an antenna that uses a part of a paraboloid of rotation as a reflecting mirror surface, and a micro-vibration generator that generates mechanical micro-vibrations, which is installed at the lower part of the back surface of this reflecting mirror surface, and the antenna The level change is detected by a detection device equipped with a level change, and this detection output is used as a control signal for the micro-vibration generator, and the mechanical vibration generated by the micro-vibration generator is transmitted from at least A reflector antenna characterized in that the vibration is transmitted to a lower part of a reflecting mirror surface, and the vibration prevents icing or snow from accumulating on a part or the whole of the antenna.