JPS6398201A - Plane antenna - Google Patents

Abstract

PURPOSE:To receive two modes of waves (horizontally and vertically polarized waves, or dextrorotatory and levorotatory circularly polarized waves) having different polarized planes, by supplying power to a power supplying point shifted by 90 deg. from a radiant space resonator through a complete independent power supplying system. CONSTITUTION:An independent power supply circuit 3a supplied to the power supplying point A is formed by forming a metallic case with grooves 6a and 6b pierced on metallic plates 5a and 5b, and arranging a power supply line 2 in a space formed with both grooves 6a and 6b, and an independent power supply circuit 3b is formed by arranging the power supply line 2 in the space formed with grooves 6c and 6d pierced on metallic plates 5c and 5d. The resonance mode of an electromagnetic wave in a case where the power is supplied from the power supplying point A is a mode where a wave of electric field exists in an X direction, and the resonance mode of the electromagnetic wave in the case where the power is supplied from the power supplying point B provided being shifted by 90 deg. form the power supplying point A is the mode where the wave of electric field exists in a Y direction, and the mode of the former is a horizontal polarized wave reception mode, and that of the latter is a vertical polarized wave reception mode.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a flat antenna used for broadcast reception, communication, etc. via a geostationary satellite.

[Background technology] Recently, satellite broadcasting using geostationary satellites has become popular.
Since the satellite is fixed at a predetermined position in a geosynchronous orbit of m, there is a problem that a large number of geostationary satellites cannot be placed. For example, even if there are 21 spaces for geostationary satellites, only 180 can be placed in geostationary orbit.

Therefore, it is necessary to make effective use of each geostationary satellite.
Efforts are being made to use higher frequencies (shorter wavelengths), but there are limits as improvements in the characteristics of transmitting/receiving systems, devices, etc. are essential. Therefore, it is being considered to effectively utilize a plurality of radio waves with different polarization planes as radio waves from geostationary satellites.

In other words, when radio waves from a geostationary satellite are linearly polarized, horizontal and vertical polarization are shared; when radio waves from a geostationary satellite are circularly polarized, right-handed and left-handed circularly polarized waves are used. Consideration is being given to doubling the usage efficiency of radio waves by sharing them with radio waves. However, in such cases, it is necessary to use a terrestrial receiving antenna that can simultaneously receive radio waves in two modes with different polarization planes. The horizontally polarized wave component and the vertically polarized wave component are separated. However, there has not been a planar antenna that is compact in shape, lighter in weight, and easier to install than a parabolic antenna, but can simultaneously receive radio waves in two modes with different polarization planes.

[Object of the Invention] The present invention has been made in view of the above points, and its purpose is to provide a planar antenna that can simultaneously receive radio waves in two modes with different polarization planes. There is a particular thing.

[Disclosure of the Invention] (Embodiment) Figures 1 to 3 show an embodiment of the present invention, in which an antenna element consisting of a spatial resonance system for receiving radio waves,
In a planar antenna having a power supply system that supplies power to the antenna element in a suspended power supply system, the position is 90%.
'Radiating space resonator 1 with two shifted feeding points A and B
An independent power supply circuit 3a is formed in which an antenna element is formed, and a metal case is arranged around the power supply MA2 to make it completely independent.
, 3b form two power supply systems that supply power to each of the power supply points A and B. In the embodiment, the metal plate 5 a
To S b! IF! A metal case is formed by the crossed grooves 6 at 6 b, and an independent power supply circuit 3a for feeding power to the power supply point A by arranging the power supply line 2 in the space formed by both grooves 6 at Gb is formed. /11. Laminated plate 5
The feeder line 2 is arranged in the space formed by the grooves 6c and 6d drilled in the holes 6b and 5c, and a copper foil is placed on the thin dielectric plate 4, which constitutes an independent feeder circuit 3 that feeds power to the feeder point B. It is laminated and etched into a predetermined pattern.

Note that a large number of radiating space resonators 1 are arranged in a matrix, and power is fed in parallel to feeding points A and B of each radiating space resonator 1 via independent feeding circuits 3 at a b. It has become so. In FIG. 3, the alpha line 1 indicates the upper layer independent power supply circuit 3a, and the dashed dotted line indicates the lower layer independent power supply circuit 3b.

The operation of the embodiment will be described below. Now, feeding point A
The resonance mode of the electromagnetic waves in the radiation space resonator 1 when power is being fed from is a mode in which electric field waves exist in the The resonance mode of the electromagnetic waves in the radiation space resonator 1 when power is being supplied from This is polarization reception mode.

4 and 5 show examples in which a signal synthesis circuit for circularly polarized wave reception is formed using a microstrip line, and the microstrip line has a ground conductor 1 on the back side.
It is formed by arranging a strip line conductor 12 on the surface of a dielectric substrate 11 provided with output terminals 0.
,02 to each input terminal I,,1. The length up to is set so that the phase difference thereof is π/2 (λ/4).

Therefore, the horizontally polarized received signal V^ and the vertically polarized received signal VB input from the antenna output terminal Oa t Ob to the input terminals I, , I2 of the signal synthesis circuit have their phases adjusted by ±90° (±π/ 2, ±λ/4) and synthesized, right-handed circularly polarized received signal Vl (VA-VB=-π/2)
Approximately zo left-handed circularly polarized received signal V2 (VA-VB=1π/2
) are output to output terminals 01 and 02.

Note that when receiving horizontally polarized waves and vertically polarized waves simultaneously, the signals output from the antenna output terminals Oa and Ob may be used as the received signals.

[Effects of the Invention] As described above, the present invention provides a planar antenna having an antenna element made of a spatial resonance system that receives radio waves and a feeding system that feeds power to the antenna element in a suspended feeding system. An antenna element is formed by a radiating two-way resonator having two shifted feeding points,
A metal case is placed around the power supply line to form two power supply systems that supply power to each power supply point using completely independent power supply circuits. Since the power is fed to the feeding points of the radiating space resonator that are 90 degrees apart, it is possible to simultaneously receive radio waves in two modes with different polarization planes (horizontal and vertical polarization, or right-handed and left-handed circularly polarized waves). effective.

[Brief explanation of the drawing]

FIG. 1 is a cutaway perspective view of a main part of an embodiment of the present invention, FIG. 2 is a sectional view of a main part of the same, FIG. 3 is a front view of a main part of the same, and FIG. 4 is a front view of a main part of the same, and FIG. FIG. 5 is a sectional view of the main part of the same as above. 1 is a radiation space resonator, 2 is a feed line, and 3 at 3 b is an independent feed circuit. Agent Patent Attorney Ishi 1) Ai 71... Radiation space resonator Figure 2 51) 5C

Claims (1)

[Claims] (1) In a planar antenna that has an antenna element consisting of a spatial resonance system that receives radio waves and a feeding system that feeds power to the antenna element in a suspended feeding method, radiation that has two feeding points positioned 90° apart The antenna element is formed by a spatial resonator, and a metal case is placed around the feed line to form two completely independent feed circuits that feed power to each feed point. flat antenna.