JPH0548325A - Plane antenna - Google Patents

Abstract

PURPOSE:To attain the high efficiency and to improve the cross polarized wave characteristic by devising a feeding circuit of the antenna to be simplified and the antenna to reduce unnecessary intercoupling. CONSTITUTION:A radiation circuit board 1 is formed by punching out plural apertures 4 of circularly polarized wave type while the apertures, whose directions are sequentially turned by 90 deg., are arranged at an equal interval in the longitudinal and lateral directions. A feeding circuit having series feeding probes 6 whose phases differ by 90 deg. each and which are electromagnetically coupled with each aperture 4 of the radiation circuit board 1 is formed to a feeding circuit board 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a planar antenna.

[0002]

2. Description of the Related Art Conventional planar antennas have been proposed which are formed by bending a strip line into a crank shape, or by a plurality of patch elements. However, since these are generally narrow bands, it is difficult to have sufficient performance in the broadcasting band extending from 300 to 400 MHz. Furthermore, the loss from the power supply line was large and it was difficult to improve the efficiency efficiently.

Therefore, in order to achieve high efficiency and wide band, a ground conductor plate,
A tri-plate type planar antenna consisting of a feeding circuit board and a radiation circuit board was developed, and it has reached the same level of reception performance as a para-polar antenna. Furthermore, in order to secure cross polarization characteristics over a wide band, a method is proposed in which two elements (pair elements) having a phase difference in the above antenna configuration are used as a sub-array and a plurality of these elements are combined to form an antenna. Has been done.

[0004]

However, in the plane antenna, however, the technical development having high efficiency and high cross polarization characteristics has been insufficient until now. The present invention has been made in view of the above problems, and an object thereof is to simplify a power supply circuit and reduce unnecessary mutual coupling to achieve high efficiency and cross polarization characteristics. An object is to provide a planar antenna that can be improved.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 comprises a ground conductor plate, a feed circuit board and a radiating circuit board, and a radiating element of the radiating circuit board and a feed circuit board. In a planar antenna that electromagnetically couples with a feeding probe added to the feeding line, a plurality of feeding probes partially arranged in series have a phase difference of 360 degrees / (number of feeding probes arranged) and feed these The radiating element to be electromagnetically coupled with the probe is rotationally arranged by 360 degrees / (number of arranged feeding probes).

According to a second aspect of the present invention, in the first aspect of the invention, the radiating element is formed by an aperture, and the shape of the aperture is a circle or a regular polygon, and the radiating element is 45 degrees passing through the center of the shape. A protrusion protruding into the shape in the inclined diametrical direction or a notch continuously provided outside the shape is formed. According to a third aspect of the present invention, in the first aspect of the invention, the number of power supply probes in the group partially arranged in series is four.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a conductive element is arranged in the vicinity of the power feeding probe without contacting the power feeding probe.

[0008]

According to the plane antenna of the invention described in claim 1, the plurality of feed probes partially arranged in series have a phase difference of 360 degrees / (the number of feed probes arranged), and Since the radiating element to be electromagnetically coupled to the power supply probe is arranged in rotation by 360 degrees / (number of power supply probes arranged), the power supply probe can be serially supplied, and the power supply circuit can be simplified. The reduction in efficiency due to unnecessary mutual coupling, which has been a problem in the past, can be minimized, high efficiency can be realized, and cross polarization can be improved by the rotational arrangement of the radiating elements.

According to a second aspect of the present invention, in the first aspect of the present invention, since the radiating element is formed by the aperture, the metal plate is easily punched and can be manufactured at low cost. It can be adopted, and the cost can be significantly reduced as compared with the conventional etching process.
Further, the shape of the aperture is a circle or a regular polygon, and a projection protruding into the shape in the diametrical direction which is inclined by 45 degrees passing through the center of the shape or a notch continuous with the shape is formed. Circular polarization performance can be improved, and a plane antenna for circular polarization reception can be obtained which has a very wide band, high efficiency, and high cross polarization characteristics.

According to a third aspect of the present invention, in the first aspect of the present invention, the number of the feeding probes of the group partially arranged in series is set to four. Therefore, a phase having a phase difference of 90 degrees is provided. A plane antenna in which the power supply and the radiating element are rotated by 90 degrees can be realized. According to a fourth aspect of the present invention, in the first aspect of the present invention, a conductive element is arranged in the vicinity of the power feeding probe without contacting the power feeding probe. Could be realized.

[0011]

EXAMPLES The present invention will be described below with reference to examples. (Embodiment 1) FIG. 1 is an exploded perspective view in which a part of the present embodiment 1 is omitted. In this embodiment, a circular polarization type aperture 4 is formed on a metal plate such as 0.4 mm thick aluminum.
A plurality of radiating circuit boards 1 are rotated and arranged at equal intervals by 90 degrees and punched to form a radiating circuit board 1. Electromagnetic coupling is possible to each aperture 4 of the radiating circuit board 1 and a phase difference of 90 degrees is provided. Feeding circuit 5 with a series feeding probe 6
A power supply circuit board 2 formed by etching is disposed below the radiation circuit board 1 at a constant interval, and further below the power supply circuit board 2 is a ground conductor plate 3 made of a metal plate such as a commercially available aluminum plate. Are separated by a fixed distance.

Each circuit board is separated by a space layer or a dielectric layer 7 as shown in FIG. As shown in FIG. 3, the aperture 4 formed on the radiating circuit board 1 has a circular hole with a diameter of 13 mm, which is formed by projecting the protrusion inward from the inner edge of the hole located at both ends of the diameter inclined by 45 degrees. In the radiant circuit board 1 of the first embodiment, it is formed at 20 mm intervals.
Stamped in row 16 column.

In the present embodiment, the power supply circuit board 2 is formed by etching a power supply circuit 5 using a printed circuit board. A power supply probe 6 is coupled to the tip of the power supply line pattern, and the power supply probe 6 is connected in series. It has a phase difference of 90 degrees, and is formed so that power can be supplied to the aperture 4 which is rotationally arranged to correspond to this. The positional relationship between them is as shown in FIG. 4, and the sub-array is constructed as shown in FIG.

The ground conductor plate 3 is formed by using a metal plate such as a commercially available aluminum plate having a thickness of 2 mm. Here, the dielectric 7 between the radiation circuit board 1 and the power supply circuit board 2 and between the power supply circuit board 2 and the ground conductor board 3 is a dielectric material made of a foamed plastic sheet that functions as an air layer or a spacer. To take.

The first embodiment obtained by the above-mentioned configuration
When the gain and cross polarization characteristics of the planar antenna of No. 2 were measured, an efficiency of 64% or more and a cross polarization characteristic of 25 dB or more were obtained over a wide band (1 GHz) of 11.5 to 12.5 GHz. I was able to confirm. (Embodiment 2) The planar antenna of the embodiment 2 is the same as the embodiment 1 described above.
The conductor element 8 is arranged in close proximity to the power supply probe 6 of FIG. 6 without contacting the power supply probe 6, and an example of the sub-array of this embodiment is shown in FIG.

The antenna performance in the case of the second embodiment is further improved as compared with the first embodiment, and the performance equal to or higher than that of the first embodiment can be confirmed over a wide band of about 10%. (Third Embodiment) In the third embodiment, instead of the aperture shape of the first embodiment, as shown in FIG. 7, the shape of the aperture 4 is connected to the inner edge of the hole located at both ends of the diameter inclined by 45 degrees into the circular hole. It is a hole with a notch so that it will be installed. In the case of this example, the same effect as that of Example 1 was confirmed.

(Embodiment 4) Although the basic shape of the aperture shape of Embodiment 2 is circular, it may be square.
In the fourth embodiment, as shown in FIG. 8, the aperture 4 is formed by a hole having a notch so as to be connected to a pair of diagonal portions of a square. (Embodiment 5) In each of the above embodiments, the radiation circuit board 1 is formed of a metal plate made of an aluminum plate, but in this embodiment 5, a copper foil portion of a commercially available flexible printed circuit board is used as a conductive plate to form the aperture 4. Although the shape is formed by etching and an etching process is required, it was confirmed that the antenna has the same effect as that of the above embodiment.

[0018]

The planar antenna of the invention according to claim 1 is
A plurality of feeding probes partially arranged in series have a phase difference of 360 ° / (number of feeding probes arranged) and a radiating element 36 electromagnetically coupled with these feeding probes is provided.
Since the probe is rotated by 0 degree / (number of feed probes arranged), it is possible to feed the feed probes in series, which simplifies the feed circuit and eliminates the unnecessary mutual coupling that has been a problem in the past. There is an effect that the reduction in efficiency due to can be minimized and, as a result, high efficiency can be realized and the cross polarization can be improved by the rotational arrangement of the radiating elements.

According to a second aspect of the present invention, in the first aspect of the invention, since the radiating element is formed by the aperture, the metal plate can be easily and inexpensively manufactured by punching to produce a radiating circuit board. It has the effect of being able to be adopted, and the cost can be significantly reduced compared to the conventional etching process. Furthermore, the shape of the aperture can be circular or regular polygonal, and it can pass through the center of the shape.
Since it is formed with a projection that protrudes inward in the diameter direction or a notch that is continuously provided outside the shape in a diametrical direction that is inclined by 5 degrees, circular polarization performance can be improved, and extremely wide band, high efficiency and high cross polarization can be achieved. A plane antenna for circularly polarized wave reception with satisfactory wave characteristics can be obtained.

According to a third aspect of the present invention, in the first aspect of the present invention, the number of the feeding probes of the group partially arranged in series is set to four, so that a phase having a phase difference of 90 degrees is provided. It is possible to realize feeding and a plane antenna in which the radiating element is rotated by 90 degrees. According to a fourth aspect of the present invention, in the first aspect of the present invention, a conductive element is arranged in the vicinity of the power feeding probe without contacting the power feeding probe. The effect is that it can be realized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a first embodiment of the present invention with a part thereof omitted.

FIG. 2 is a cross-sectional view of the first embodiment of the present invention.

FIG. 3 is an explanatory view of the shape of the aperture according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram of the positional relationship between the aperture and the feeding probe according to the first embodiment of the present invention.

FIG. 5 is a configuration explanatory diagram of a sub-array according to the first embodiment of the present invention.

FIG. 6 is an explanatory diagram of a configuration of a sub array according to a second embodiment of the present invention.

FIG. 7 is an explanatory view of the shape of the aperture according to the third embodiment of the present invention.

FIG. 8 is an explanatory view of the shape of the aperture according to the fourth embodiment of the present invention.

[Explanation of symbols]

 1 Radiation circuit board 2 Feed circuit board 3 Ground conductor board 4 Aperture 5 Feed circuit 6 Feed probe

Claims (4)

[Claims] 1. A planar antenna comprising a ground conductor plate, a feeding circuit plate and a radiating circuit plate, wherein a radiating element of the radiating circuit plate and a feeding probe added to a feeding line of the feeding circuit plate are electromagnetically coupled to each other. The plurality of feed probes arranged in series have a phase difference of 360 degrees / (the number of feed probes arranged) and the radiating elements electromagnetically coupled to these feed probes are 360 degrees / (the number of feed probes arranged) A planar antenna characterized by being rotated and arranged one by one. 2. The radiating element is formed by an aperture, and the shape of the aperture is a circle or a regular polygon, and
The planar antenna according to claim 1, wherein a projection protruding into the shape or a notch continuously provided outside the shape is formed in a diametrical direction inclined by 45 degrees passing through the center of the shape. 3. The planar antenna according to claim 1, wherein the number of the feeding probes of the group partially arranged in series is four. 4. The plane antenna according to claim 1, wherein a conductive element is arranged in the vicinity of the feeding probe without contacting the feeding probe.