JPH03283902A - Planer antenna - Google Patents

Abstract

PURPOSE:To manufacture a circularly polarized wave radiating element in various shapes independently of the shape of a slot by employing a dielectric base provided separately from a waveguide and a circularly polarized wave radiation element formed into the dielectric film and using slots arranged in pairs so as to fetch received power to the waveguide and synthesizing the power therein. CONSTITUTION:A dielectric base 3 has a conductive film only its surface opposite to a side facing a waveguide 1 and the conductive film is etched to a required pattern to form plural circularly polarized wave radiation elements 4 to a position corresponding to slots 2. The circularly polarized wave radiation elements 4 are formed to an optional shape. The power received by the plural circularly polarized wave radiation elements 4 are fetched into a waveguide 1 by using the slots 2 in pairs, the waveguide 1 synthesizes the power to obtain required power. Then the shape of the circularly polarized wave radiation elements 4 is selected optionally and the number and the arranged location of the slots 2 and the circularly polarized wave radiation elements 4 are selected optionally to easily realize a desired reception characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flat antenna for reception, and more particularly to a flat antenna for reception of satellite broadcasting using microwaves.

[Conventional technology]

Conventionally, there is a planar antenna of this type as shown in FIG. This is an example of a planar antenna using waveguide slots, in which a plurality of slots 12 forming pairs for receiving circularly polarized waves are arranged on one side of a hollow disk-shaped waveguide 11 at desired pattern positions. It was formed in In this planar antenna, the power received through the slot 12 is combined in the waveguide 11 to obtain the desired input power. Note that a cross-shaped slot has also been proposed.

Further, as another conventional planar antenna, an example of a planar antenna using a triplate structure is shown in FIG. This antenna consists of a radiating circuit board 21. Power supply circuit board 22. Ground plate 2
3 are arranged through dielectric plates 2425, and the power received by the circularly polarized wave radiating elements 21a formed in plurality on the radiating circuit board 21 is transmitted to the feeding circuit 22a formed on the feeding circuit board 22. are synthesized to obtain the desired power.

[Problem to be solved by the invention]

Among such conventional planar antennas, the planar antenna using waveguide slots shown in Fig. 6 receives circularly polarized waves using slots or cross-shaped slots. There is a problem in that it is difficult to create a receiver in a specific shape, and it is difficult to obtain arbitrary reception characteristics.

In addition, the planar antenna with the triplate structure shown in Figure 7 uses a feeder circuit to combine the power received by multiple circularly polarized wave radiating elements, so there is a problem that there is a lot of loss due to the feeder line. be.

The present invention solves these problems and provides a planar antenna that can obtain arbitrary reception characteristics and reduces loss in the feed system.

[Means to solve the problem]

The planar antenna of the present invention includes a plurality of slots provided on one side of a waveguide, a dielectric substrate extending over these slots, a desired pattern formed on the surface of the dielectric substrate, and It is composed of a plurality of circularly polarized wave radiating elements each made of a conductive film and arranged corresponding to the slot.

Here, a conductive film may be provided on the back surface of the dielectric substrate, this conductive film may be patterned to form a plurality of slots, and this back conductive film may be configured as one side of the waveguide.

Alternatively, a configuration may be employed in which circularly polarized wave radiating elements are formed in a desired pattern on a dielectric film, and this dielectric film is attached to a dielectric substrate.

[Effect]

According to the present invention, a circularly polarized wave radiating element is formed on a dielectric substrate provided separately from the waveguide, and this circularly polarized wave radiating element is arranged facing the slot of the waveguide. The power received by the wave radiating element is taken into the waveguide through the slot and the power is combined.

〔Example〕

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

FIG. 1 is a plan view of a first embodiment of the planar antenna of the present invention;
FIG. 2 is a sectional view taken along line A--A in FIG. 1. In the figure, reference numeral 1 denotes a waveguide made of a conductive material such as metal in the shape of a hollow disk, and a plurality of slots 2 are formed at required positions on one side of the waveguide. Further, on one side of the waveguide 1, a dielectric substrate 3 is arranged adjacent to the dielectric substrate 3 so as to face each other, and is extended above the slot 2. This dielectric substrate 3 has a conductive film only on the surface opposite to the waveguide 1, and by etching this conductive film into a desired pattern, a plurality of conductive films are formed at positions corresponding to the slots 2. A circularly polarized wave radiating element 4 is formed.

This circularly polarized wave radiating element 4 can be configured in any shape, and in this embodiment, it is formed into a circular shape with a portion of the circumference cut out.

According to this configuration, the power received by the plurality of circularly polarized wave radiating elements 4 is taken into the waveguide 1 through the paired slots 2, and the powers are combined in the waveguide 1 to obtain the desired power. I can do it. By arbitrarily setting the shape of this circularly polarized wave radiating element 4, and arbitrarily setting the number and locations of slots 2 and circularly polarized wave radiating elements 4, desired reception characteristics can be easily achieved. It becomes possible to obtain.

FIG. 3 is a sectional view of a second embodiment of the invention.

In this embodiment, the waveguide IA is formed into a box shape with one side removed, and a conductive film 5 is formed on the waveguide side surface, that is, the back surface, of the dielectric substrate 3 placed adjacent to the waveguide IA. ing. Slots 2A are formed by etching and removing this back conductive film 5 at a plurality of locations, that is, locations corresponding to the circularly polarized wave radiating elements 4.

According to this configuration, the waveguide IA moves aside from the conductive film 5 and functions as a waveguide. Also, in this embodiment, as in the first embodiment, the power received by the circularly polarized wave radiating element 4 is taken into the waveguide IA through the slot 2A.
The power is combined at A to obtain the desired power.

FIG. 4 is a sectional view of a third embodiment of the present invention.

In this embodiment, a dielectric film 6 on which a circularly polarized wave radiating element 4 is formed is arranged adjacent to a dielectric substrate 3 on one side of a waveguide 1.
By pasting it on the surface of the dielectric substrate 3, a circularly polarized wave radiating element 4 is formed on the surface of the dielectric substrate 3.

In this configuration, the circularly polarized wave radiating element 4 can be formed by etching a conductive film on the dielectric film 6.
Since it is only necessary to attach this dielectric film 6 to the dielectric substrate 3 after that, it is possible to easily manufacture the circularly polarized wave radiating element 4 on the dielectric substrate 3.

Note that the waveguide 1. The planar shape of the dielectric substrate 3 may be square as shown in FIG.
The pair of slots 3 and 3 may be arranged in a plane on a straight line with respect to the waveguide 1.

[Effects of the Invention] As explained above, the present invention uses a circularly polarized wave radiating element formed on a dielectric substrate or dielectric film provided separately from a waveguide. Since the received power is taken into the waveguide by the slots installed in pairs and combined, it is possible to manufacture the circularly polarized wave radiating element, which serves as the receiving element, in various shapes independently of the slots. This has the effect that arbitrary receiving characteristics can be obtained and loss due to the power supply system can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a first embodiment of the planar antenna of the present invention;
FIG. 2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a sectional view of a second embodiment of the present invention, FIG. 4 is a sectional view of a third embodiment of the present invention, and FIG. 6 is a partially cutaway perspective view of an example of a conventional planar antenna, and FIG. 7 is a partially exploded perspective view of another conventional planar antenna. 1. IA... waveguide, 2.2A... slot, 3.
... Dielectric substrate, 4... Circularly polarized wave radiation element, 5... Back conductive film, 6... Dielectric film, 11... Waveguide, 12... Slot, 21... Radiation circuit board, 21a
...Circularly polarized wave radiating element, 22...Feeding circuit board, 22a
...Power supply circuit, 23...Grounding plate, 24.25...
dielectric plate. Figure 3 Figure 6 Figure 7

Claims (1)

[Claims] 1. A plurality of slots provided on one side of the waveguide, a dielectric substrate extending over these slots, and a plurality of slots formed on the surface of the dielectric substrate in a desired pattern, and and a plurality of circularly polarized wave radiating elements made of conductive films arranged corresponding to the slots. 2. A conductive film is provided on the back surface of a dielectric substrate, this conductive film is patterned to form a plurality of slots, and this back conductive film is configured as one side of a waveguide. The planar antenna according to item 1. 3. A planar antenna according to claim 1, wherein a circularly polarized wave radiating element having a desired pattern is formed on a dielectric film, and the dielectric film is attached to a dielectric substrate.