JPH01206704A - Antenna device - Google Patents

Abstract

PURPOSE:To simultaneously use an antenna device with the plural function of a different frequency in one device by composing an antenna aperture surface of plural waveguides to be arranged in an array shape. CONSTITUTION:In the antenna device, a wave from a primary radiator 1, which is composed of a horn antenna, etc., is supplied to plural waveguides 2, which are arranged in the array shape, by space welding. A phase shifter 3, which is controlled by a signal from a phase shifting control circuit not to be shown in a figure, is integrated to each waveguide 2. An aperture surface 21 by the plural waveguides 2 is formed in a parabola shape and the wave form another radiator 4, whose frequency is different from the primary radiator 1, is received and reflected. Here, since the wave from the primary radiator 4 is supplied through a sub-reflecting mirror 5 to the aperture surface of the waveguide 2, the aperture surface 21 of the waveguide obtains the constitution of a main reflecting mirror to the sub-reflecting mirror 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement in an antenna device that handles multiple frequencies simultaneously.

(Conventional technology) In recent years, communication devices and radars that use artificial satellites use a large number of frequencies (channels) in order to improve their use.
radio waves are being used simultaneously. When transmitting and receiving radio waves having different frequencies, antenna devices corresponding to the respective frequencies are used depending on the degree of the frequency difference, especially when the purpose of use is different.

In general, antenna devices mounted on artificial satellites are subject to significant restrictions in terms of limbs, volume, etc., so the number of antennas is
severely limited. Therefore, it is desirable to have a multi-frequency antenna that can simultaneously use a plurality of frequencies for different purposes with one antenna device. Conventionally, transmitting and receiving radio waves of different frequencies using one antenna device is known as, for example, UHF in television signals,
This is where you can see the VHFHF common ambuna. However, for example, in the case of antenna equipment installed on earth resource exploration satellites, high functionality is required on the one hand to scan the antenna beam by remote sensing and on the other hand fixed communication with the earth station is required. be done. Conventionally (
J. It has been difficult to realize an antenna device that can respond not only to such a large frequency but also to different functions of the antenna itself.

(Problems to be Solved by the Invention) Therefore, it is an object of the present invention to provide an antenna device that can be used for a plurality of uses, each having different frequencies as well as antenna functions.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides an antenna device having a plurality of waveguides arranged in an array that receives radio waves from a -order copper discharger and radiates them into space. , the aperture surface of the plurality of waveguides arranged in an array is configured to serve as a parabolic reflection surface for other radio waves.

(Embodiment) Hereinafter, one embodiment of the antenna device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of the structure of an embodiment of the apparatus according to the present invention, but does not show it. In Figure 1,
Radio waves from a primary radiator (1) such as a horn antenna are supplied to a plurality of waveguides (2) arranged in an array by space feeding.

Each of the plurality of waveguides (2) arranged in an array includes a phase shifter (3) controlled by a signal from a phase shift control circuit (not shown).

The first surface (21) is formed in a so-called parahora shape and has another primary radiator (/l) having a different frequency from the above-mentioned -order radiator (). Due to the configuration of the entire antenna system in FIG. shaped waveguide (2
), the aperture surface (21>) of the waveguide constitutes a main reflecting mirror with respect to the sub-reflecting mirror (5>).

The area of the waveguide aperture (21) as the main reflecting mirror conforms to the required shape of the antenna beam, and it can be extended outside the waveguide aperture as necessary as shown in the figure. You can do it.

Therefore, the waveguide frontage surface (21), which becomes the main reflecting mirror, is now
The conditions for both order radiators (1) and (4,) to function effectively together for radio waves are as follows.

That is, the frequency of the -order radiator (1) is F L (Ghz)
.

The frequency of the other primary radiator (4) is FH (Ghz), and the horizontal and vertical lengths of the aperture cross section of each waveguide (2) are L1 (
mm), l2 (#). At each waveguide opening surface, the radio waves from the primary radiator (1) pass through, and the radio waves from the other primary radiators (4) are sufficiently cut off and effectively reflected. This condition is expressed by the following two equations for linearly polarized waves in the right direction as shown in FIG.

Ft, <<300/2+1...■FH>300
/2+1・・・・・・・・・■If the length of the opening cross section of the waveguide is +1-12, then the other primary radiator (4)
Even if the radio waves from the -order radiator (1) are circularly polarized signals,
It is reflected effectively without being affected by the radio waves from. Further, in the above embodiments, the antenna device is described as having a shared transmitting/receiving function, but it goes without saying that it can also be used as a device for only transmitting or receiving depending on the purpose.

In this way, the radio waves from the -order radiator (1) can be given the function of an electronic scanning antenna by controlling the drive of the phase shifter (3) in the waveguide (2) arranged in an array. ,
It can also serve as a main reflector for radio waves from other primary transmitters (4) and also have a communication function with the other party's fixed station.

"Effects of the Invention" As described above, the antenna device of the present invention is one device that can be used simultaneously for multiple functions of different frequencies, and has great practical effects.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing an embodiment of the antenna device according to the present invention, and FIG. 2 is a perspective view showing an enlarged view of the waveguide aperture of the device shown in FIG. 1. Illustrated. (1>-order radiator (2) waveguide (21) aperture of waveguide (3) phase shifter (4) other primary radiator (5) sub-reflector

Claims (1)

[Claims] In an antenna device having a plurality of waveguides arranged in an array that receives radio waves from a primary radiator and radiates them into space, the aperture surface of the plurality of waveguides arranged in the array is used to radiate radio waves into space. An antenna device configured to serve as a parabolic reflecting surface.