JP3272067B2 - Dual-polarized planar antenna - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual-polarized planar antenna capable of receiving left-handed circularly polarized waves and right-handed circularly polarized waves.

[0002]

2. Description of the Related Art Communication or broadcasting using satellites has become very popular in recent years. There is an area where a radio wave from a satellite is transmitted with either right-handed circular polarization or left-handed circular polarization. Conventionally, in such an area, a right-handed circularly polarized wave or a left-handed circularly polarized wave is switched and received by the configuration as shown in FIG.

In FIG. 3, reference numeral 11 in the first and second planar antennas A and B denotes a disk-shaped lower metal plate, and 12 denotes a disk-shaped upper metal plate having the same diameter as the lower metal plate 11. The lower metal plate 11 and the upper metal plate 12 are opposed to each other in parallel with an interval of less than one wavelength, and short-circuited by providing a short-circuit plate 13 on the outer peripheral edge.

In the center of the lower metal plate 11, there is provided a power supply portion 15 into which a power supply probe is inserted for achieving high-frequency coupling with the waveguide 14 formed by the space with the upper metal plate 12. The waveguide 14 may be configured by filling a foamed dielectric.

On the other hand, the upper metal plate 12 has a large number of small holes 1.
Are formed at intervals of one wavelength or less along each of a plurality of concentric curved lines having an interval of one wavelength or less. Are inserted via insulating spacers 18, and are coupled to the waveguide 14 at equal power. The helical antennas 17 of the planar antenna A are all for right-handed circularly polarized waves, and the helical antennas 17 of the planar antenna B are all for left-handed circularly polarized waves.

The converter 21 of the planar antenna A
a denotes a signal received by the feeder 15 which is frequency-converted and amplified, and then output to the switch 22 to convert the signal of the planar antenna B.
The converter 21 b frequency-converts and amplifies the signal received by the power supply unit 15 and outputs the signal to the converter 22. The switch 22 is connected to the converter 2 according to an external operation switch.
One of the output signals 1a and 21b is selectively output.

[0007]

As described above, conventionally, two planar antennas, two converters, a switch and the like are required, so that the structure becomes complicated and the apparatus becomes expensive. Was.

The present invention has been made in view of the above points, and has as its object to provide an inexpensive dual-polarization plane capable of receiving both right-handed and left-handed polarized waves with a single planar antenna. It is to provide an antenna.

[0009]

According to a first aspect of the present invention, there is provided a dual-polarization planar antenna, comprising: a circular lower metal plate;

[0010] An upper metal plate having a shape corresponding to the lower metal plate and disposed above and in parallel with the lower metal plate at an interval of less than one wavelength, and an outer peripheral edge of each of the upper metal plate and the lower metal plate. A short-circuiting plate for short-circuiting the power supply, a power supply unit provided at the center of the lower metal plate for high-frequency coupling to a waveguide formed between the upper and lower metal plates, and a concentric circle having an interval of one wavelength or less with respect to the upper metal plate. A plurality of small holes formed at intervals of one wavelength or less along each of the plurality of curved lines; a right-handed circularly polarized wave and a left-handed circular wave inserted into the plurality of holes and high-frequency coupled to the waveguide; A plurality of radiating elements for polarization and an insulating spacer interposed between the plurality of radiating elements and the small holes are provided.

According to a second aspect of the present invention, the plurality of radiating elements for right-handed circular polarization and the plurality of radiating elements for left-handed circular polarization are provided alternately concentrically around the center of the upper metal plate. Have been. The dual-polarized planar antenna according to claim 3 is provided on the left and right with the center of the upper metal plate as the center.

[0012]

In each of the first to third embodiments, a plurality of radiating elements for right-hand circular polarization and a plurality of radiating elements for left-hand circular polarization are provided on the upper metal plate. One plane antenna can receive both right-handed and left-handed circularly polarized waves.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dual-polarized planar antenna according to a first embodiment of the present invention. 1A and 1B show a configuration of a dual-polarized planar antenna. FIG. 1A is a plan view thereof, and FIG. 1B is a sectional view taken along line BB.
In FIG. 1, 11 is a disk-shaped lower metal plate, 12 is a disk-shaped upper metal plate having the same diameter as the lower metal plate 11, and the lower metal plate 11 and the upper metal plate 12 are
They are arranged in parallel to each other with an interval of less than one wavelength, and are short-circuited by providing a short-circuit plate 13 on the outer peripheral edge.

In the center of the lower metal plate 11, there is provided a power supply portion 15 into which a power supply probe is inserted for achieving high-frequency coupling with the waveguide 14 formed by the space with the upper metal plate 12. The waveguide 14 may be configured by filling a foamed dielectric.

On the other hand, the upper metal plate 12 has many small holes 1.
Are formed at intervals of one wavelength or less along each of a plurality of concentric curves having an interval of one wavelength or less. Probes 17a,... Are inserted through insulating spacers 18,. The helical antennas 17 of the first and third layers from the center of the upper metal plate 12 are constituted by right-handed circularly polarized wave receiving elements. Device.

With the above configuration, the right-handed circularly polarized wave receiving element and the left-handed circularly polarized wave receiving element are provided in one planar antenna. Can be received.

Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the upper metal plate 12
A radiating element for left-handed circular polarization is used as the helical antenna 17 belonging to the block A1 on the left side of the center of FIG.

With such a configuration, the right-handed circularly polarized wave receiving element and the left-handed circularly polarized wave receiving element are provided in one planar antenna. Can be received. The arrangement of the right-handed circularly polarized wave receiving element and the left-handed circularly polarized wave receiving element provided in one planar antenna is not limited to the above-described embodiment.

As described above, in any of the embodiments, since one plane antenna can receive both right-handed and left-handed polarized waves without using a switch, an inexpensive plane antenna can be used. An antenna can be provided.

[0020]

As described above in detail, according to the present invention, there is provided an inexpensive dual-polarized plane antenna capable of receiving both right-handed and left-handed polarized waves with a planar antenna. Can be.

[Brief description of the drawings]

FIGS. 1A and 1B show the configuration of a dual-polarized planar antenna according to a first embodiment of the present invention. FIG. 1A is a plan view thereof, and FIG. 1B is a sectional view taken along line BB.

FIG. 2 is a plan view of a dual-polarized planar antenna according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional planar antenna that receives circularly polarized waves and left circularly polarized waves.

[Explanation of symbols]

11 lower metal plate, 12 upper metal plate, 13 short circuit plate,
14: waveguide, 15: feeding part, 16: small hole.

Continuation of the front page (56) References JP-A-4-78201 (JP, A) JP-A-4-157802 (JP, A) JP-A-4-43705 (JP, A) JP-A-4-196702 (JP) , A) Hikaru Hei 3-120112 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) H01Q 21/24

Claims (3)

(57) [Claims] 1. A lower metal plate having a circular shape, an upper metal plate having a shape corresponding to the lower metal plate and disposed above and in parallel with the lower metal plate at an interval of less than one wavelength and having a shape corresponding to the lower metal plate; A short-circuit plate that short-circuits the outer peripheral edge of each of the lower metal plates; a power supply unit provided at the center of the lower metal plate for high-frequency coupling to a waveguide formed between the upper and lower metal plates; On the other hand, a plurality of small holes formed at intervals of one wavelength or less along each of a plurality of concentric circular curves having an interval of one wavelength or less, and inserted into these small holes and high-frequency coupled to the waveguide. A dual-polarized planar antenna, comprising: a plurality of radiating elements for right-handed circular polarization and left-handed circular polarization; and an insulating spacer interposed between the plurality of radiating elements and the small holes. 2. A plurality of radiating elements for right-handed circular polarization and a plurality of radiating elements for left-handed circular polarization are provided concentrically alternately around a center of an upper metal plate. 2. The dual-polarized planar antenna according to 1. 3. The radiating element for right-handed circular polarization and the plurality of radiating elements for left-handed circular polarization are provided on the left and right with a center of the upper metal plate as a center. Dual-polarized planar antenna.