JPH02290306A - Plane antenna for receiving satellite broadcast - Google Patents

Abstract

PURPOSE:To receive a radio wave normally independently of the location where an antenna is mounted by applying azimuth angle correction of an optional received radio wave to a radiation element and receiving a signal while synthesizing the signal. CONSTITUTION:When a radio wave 11 is made incident in an antenna face with an azimuth angle, a phase difference corresponding to a value dsintheta is caused, where (d) is a distance between radiator elements. When a radio wave is made incident in the right direction, the phase of the left element is retarded more than the right element by dsintheta. Since the value (d) is constant and the angle theta varies with the mount condition, plural azimuth phase adjustment devices 5A-5C, 6A-6C are prepared for a feeding circuit on an antenna so as to compensate the delay of the phase difference due to the difference of the angle theta and the devices are switched by transistor switches 7A-7C, 8A-8C depending on the signal on driving input line 9 to correct the azimuth angle in the inside of the antenna.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a flat antenna for receiving satellite broadcasting.

[Conventional technology]

In conventional flat antennas for receiving satellite broadcasting (hereinafter referred to as antennas), the main beam is set at an angle of 1 in elevation from the vertical direction, in order to prevent snow from accumulating on the antenna.
It was designed to tilt at an angle of about 0 degrees, and was equipped with an elevation phase adjuster.

[Problem to be solved by the invention]

The conventional flat antenna for receiving satellite broadcasting mentioned above has the characteristic of being a flat antenna, so when it is placed closely against a wall, depending on the direction of the wall to which it is attached, the phase difference of the radio waves may occur not only in the elevation angle but also in the azimuth direction that is almost horizontal to the ground surface. occurs. That is,
If the direction in which the radio waves come from is not perpendicular to the wall, etc. to which the antenna is attached, there is a drawback that the mounting azimuth must be adjusted so that the antenna protrudes from the wall, etc.

An object of the present invention is to provide a flat antenna for receiving satellite broadcasting that can take advantage of the advantages of a flat antenna.

[Means to solve the problem]

A flat antenna for receiving satellite broadcasting according to the present invention includes a plurality of radiating elements for receiving satellite radio waves, a plurality of azimuth angle phase adjustment circuits connected to each of the radiating elements, and any one of the phase adjustment circuits. and a transistor switch for selecting a radio wave, and performs azimuth correction on arbitrary received radio waves of the radiating element, and then receives the radio waves in combination.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. In the embodiment shown in FIG. 1, the antenna is composed of a plurality of radiating elements, and the received radio waves of each radiating element are combined.
3.4 is illustrated. Elevation angle phase adjusters IA, 2A, 3A, 4A of the received radio wave 11 having an elevation angle θ, and three types of phase adjusters 5A for the radiating element 1 to adjust the azimuth angle phase.
5B, 5C, and these three types of phase adjusters 5A, 5B
, 5C. The radiation element 2 also has a similar configuration, with an elevation angle phase adjuster 2A, azimuth angle phase adjusters 6A, 6B, 6C, a transistor switch 8A,
It has 8B and 8C. Furthermore, there are two drive input lines for driving these one-herald transistor switches, and finally there is a combined output 10 of the received radio waves. Thereafter, the radiating elements 3 and 4 have a similar configuration and are combined into a combined output 10.

Next, the operation of this embodiment will be explained. When the telephone is obliquely incident on the antenna plane in the azimuth direction, a phase difference corresponding to dsinθ occurs, where d is the distance between each radiating element.

When a radio wave is incident from the right direction, the element on the left side will be delayed in phase corresponding to dsinθ than the adjacent element on the right side. Here, d is constant, but θ changes depending on the installation conditions, so the phase adjusters 5A to 5C, 6A to By preparing multiple 6Cs and switching them with a transistor switch, it is possible to correct the azimuth inside the antenna.

〔Effect of the invention〕

As explained above, in the present invention, by providing a plurality of phase adjusters in the azimuth direction, it is possible to correct the azimuth direction inside the antenna in addition to the conventional elevation direction. This has the effect of allowing you to receive radio waves normally even when the device is placed in close contact with a wall, balcony, etc.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention. 5A-5C, 6A-6C... Azimuth phase adjuster, 7A
~7C, 8A~8C...Transistor switch, 9.
...Drive input line, 10...Synthetic output.

Claims (1)

[Claims] a plurality of radiating elements for receiving satellite radio waves; a plurality of azimuth angle phase adjustment circuits connected to each of the radiating elements; and a transistor switch for selecting any one of the phase adjustment circuits; A flat antenna for receiving satellite broadcasting, characterized in that radio waves received by a radiating element are subjected to azimuth correction and then subjected to combined reception.