JPH11251834A - Wide angle circularly polarized wave antenna radiating element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely position a patch-like radiation element and surface radiating elements by arranging the patch-like radiating element and a ground conductor board in parallel through a dielectric, jointing a ground conductor board-side to a dielectric supporting body and arranging a plurality of face-like radiating elements connected to the ground conductor board on the side of the dielectric supporting body. SOLUTION: A patch-like radiation element 2 is installed on the upper face of a dielectric 3. A dielectric supporting body 7 is jointed to a lower face via a ground conductor board 4 which integrally provides a plurality of surface radiating elements 6. The surface radiating elements 6 are jointed to the side of the dielectric supporting body 7 by bending the surface radiating elements 6 at a connection part 5. The center conductor 8a of a coaxial line 8 is inserted into a through-hole 3a of the dielectric 3 and is connected to the patch-like radiation element 2 so as to set it to be a feeding pin 1. The outer periphery of the coaxial line 8 is connected to a ground conductor board 4. Thus, the patch-like radiating element 2 and a plurality of surface radiating elements 6 can precisely be positioned only by merely positioning the ground conductor board 4 and the patch-like radiating element 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation element for a wide-angle circularly polarized antenna, which is effective for portable radio communication using a satellite in the field of communication.

[0002]

2. Description of the Related Art In recent years, various mobile phone proposals using satellites have been proposed, and the frequencies of such mobile phones are 1.6 GHz from terrestrial mobile phones to satellites and from satellites to terrestrial mobile phones. The 2.4 GHz band is allocated respectively. In the 1.6 GHz band, it is also assigned as a frequency band used for bidirectional communication from the ground to the satellite and from the satellite to the ground. As an antenna applicable to this satellite communication, an omnidirectional antenna as disclosed in Japanese Patent Application Laid-Open No. 7-183719 has been proposed.

However, the omnidirectional antenna has a problem in that the sensitivity of the horizontally polarized component of the circularly polarized wave at a low elevation angle is low. That is, when the satellite is in the vertical direction (high elevation angle), the reception sensitivity is high when viewed from the mobile phone, but when the satellite is in the horizontal direction (low elevation angle), the horizontal polarization component is absorbed by trees and the like. And the receiving sensitivity was low.

Accordingly, the present applicant has filed a Japanese Patent Application No. Hei 9-1612.
No. 86 proposed a wide-angle circularly polarized antenna. this is,
As shown in FIG. 12, a patch-shaped radiating element 2 and a ground conductor plate 4 are arranged in parallel with each other via a disk-shaped dielectric 3, and a central conductor 8a of a coaxial line 8 is connected to the patch-shaped radiating element 2. A dielectric support 7 is joined below the ground conductor plate 4 to a microstrip planar antenna (MSA) 9 serving as a feed pin 1 and a plurality of planar radiating elements 6 are provided on the side surface thereof. The radiating element 6 and the ground conductor plate 4 are connected by a connecting portion 5.

The wide-angle circularly polarized antenna includes a composite planar radiating element 10 comprising a planar radiating element 6 and a dielectric support 7 so as to improve the sensitivity of the horizontal component of circularly polarized waves at a low elevation angle. It was done.

[0006]

In the wide-angle circularly polarized antenna shown in FIG. 11, it has been found that the position of the planar radiating element 6 with respect to the patch electrode 2 and the feeding pin 1 affects the antenna characteristics. However, in the structure of FIG. 11, the planar radiating element 6 is bonded to the side surface of the dielectric support 7 and then bonded below the ground conductor plate 4 of the MSA 9, so that the patch radiating element 2 and the There is a first problem that it is difficult to accurately position the radiating element 6.

Further, the wide-angle circularly polarized antenna shown in FIG. 11 has a structure in which the planar radiating element 6 is provided on the side surface of the dielectric support member 7, and therefore is larger than the outer diameter of the dielectric member 3 by the thickness thereof. Therefore, there is a second problem that the entire antenna cannot be miniaturized.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a patch-like radiating element and a ground conductor plate which are arranged in parallel with each other via a dielectric, and a dielectric support is joined to the ground conductor plate side, and a side surface thereof is provided. A wide-angle circularly polarized antenna radiating element comprising a plurality of planar radiating elements connected to the ground conductor plate, wherein the ground conductor plate and the plurality of planar radiating elements are integrally formed. Features.

That is, if the planar radiating element is formed integrally with the ground conductor plate, the patch radiating element and the plurality of planar radiating elements can be formed simply by accurately aligning the ground conductor plate and the patch radiating element in advance. Positioning with the radiating element can be performed accurately,
The first problem can be solved.

Further, the present invention provides the above-described radiating element for a wide-angle circularly polarized antenna, wherein the dielectric support is provided with a notch for positioning.

In other words, if the dielectric support is provided with a notch for positioning, even if the planar radiating element is formed separately from the ground conductor plate, the dielectric support having the planar radiating element can be used. Bonding can be performed while performing accurate alignment with the patch-shaped radiating element, and the first problem can be solved.

Further, the present invention provides the radiating element for a wide-angle circularly polarized antenna described above, wherein the dielectric support has a smaller diameter than the dielectric.

That is, by previously setting the diameter of the dielectric support member to be small, the thickness of the planar radiating element provided on the side surface thereof does not protrude beyond the outer diameter of the dielectric member, so that the antenna can be downsized. The second problem can be solved.

According to the present invention, there is provided the above-described radiating element for a wide-angle circularly polarized antenna, wherein a planar radiating element is embedded in a side surface of the dielectric support.

That is, a concave portion having the same shape as the planar radiating element is previously formed on the side surface of the dielectric support, and the planar radiating element is buried therein, so that the thickness of the planar radiating element is reduced by the outer diameter of the dielectric. The antenna can be miniaturized so as not to protrude further, and the second problem can be solved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the radiating element for a wide-angle circularly polarized antenna of the present invention includes a patch-shaped radiating element 2 made of a thin metal plate on an upper surface of a disk-shaped dielectric 3, and a plurality of radiating elements on a lower surface. A cylindrical dielectric support 7 is joined via a ground conductor plate 4 made of a thin metal plate integrally provided with the planar radiating element 6, and the planar radiating element 6 is bent at the connecting portion 5,
It is bonded to the side surface of the dielectric support 7. The dielectric 3 has a through hole 3a at an off-center position.
The center conductor 8a of the coaxial cable 8 inserted from below is inserted into the through hole 3a and connected to the patch-shaped radiating element 2 by soldering to form the power supply pin 1, and the outer periphery of the coaxial cable 8 is connected to the ground conductor plate 4. Is connected by soldering.

A microstrip planar antenna (MSA) 9 is constituted by the patch-shaped radiating element 2 and the ground conductor plate 4 provided substantially in parallel on both surfaces of the dielectric 3, and the planar radiating element 6 provided therebelow. By configuring the composite planar radiating element 10 with the dielectric support 7, the sensitivity of the horizontal component of the circularly polarized wave at a low elevation angle can be improved. The operating frequency of the MSA 9 is about 1.6 GHz.

As shown in FIG. 2, the plane shape of the ground conductor plate 4 is a circular plate, and a connecting portion 5 is provided around the circular plate.
A plurality of planar radiating elements 6 are integrally formed through the intermediary. Further, a hole 4a for inserting the center conductor 8a of the coaxial wire 8 is provided at a position off the center. Therefore, when joining the ground conductor plate 4 to the dielectric 3, the position of the hole 4a may be made to coincide with the position of the feed pin 1 of the patch-shaped radiating element 2. At this time, each planar radiating element 6
If it is set in advance so that the and the patch-shaped radiating element 2 have an optimal positional relationship, the positioning can be performed automatically.

After bonding the ground conductor plate 4, FIG.
As shown in (a), the planar radiating element 6 is joined to the side surface of the dielectric support 7 by bending from the connecting portion 5. At this time, as shown in FIGS. 3B and 3C, it is preferable to form a chamfer 7a of the C surface or the R surface on the outer periphery of the end surface of the dielectric support member 7 so as to bend smoothly. This chamfer 7a
If both the width when the surface is a C surface and the radius of curvature when the surface is an R surface are 0.03 mm or more, the connecting portion 5 can be smoothly bent.

Although the shape of the planar radiating element 6 can be various, a square shape as shown in FIG. 2 is preferable. The number of the planar radiating elements 6 may be four or more at symmetrical positions.

The shape of the patch-shaped radiating element 2 can be a shape as shown in FIG. 1A, a circle or a square, and the planar radiating element 6 is arranged at an optimum position. To be done. For example, if the patch-shaped radiating element 2 is formed in a quadrangular shape, and the planar radiating element 6 is arranged at each vertex, the sensitivity is improved.

The patch-shaped radiating element 2, the ground conductor plate 4, the connecting portion 5, and the planar radiating element 6 are all made of a thin metal plate such as copper. For bonding, a double-sided tape or a thermosetting or two-component adhesive is used. Alternatively, the patch-shaped radiating element 2 may be formed by printing using a metal paste such as silver.

As a material of the dielectric 3, a dielectric ceramic having a dielectric constant of 20 to 45 is used. Specifically, Mg—Ca—Ti based dielectric ceramics (dielectric constant 2
0) or Mg-La-Ca-Ti dielectric ceramics (dielectric constant 29). The dielectric material 3 can be obtained by forming the raw material powders having these compositions into a predetermined shape by a known method such as press molding, firing under predetermined conditions, and processing as necessary.

Further, as the material of the dielectric support 7, a material having a dielectric constant of 4 to 20 is used. Specifically, various resins such as acrylic resin (dielectric constant 4), cordierite ceramics (dielectric constant 4), and forsterite ceramics (dielectric constant 7) are used.

Next, another embodiment of the present invention will be described.

The radiating element for a wide-angle circularly polarized antenna shown in FIG. 4 is the same as the embodiment shown in FIG. 1, except that the planar radiating element 6 and the connecting portion 5 are formed integrally with the ground conductor plate 4. Instead, they are separately provided on the side surface of the dielectric support 7 and then joined to the dielectric 3 and the ground conductor plate 4.

At this time, as described above, the planar radiating element 6
It is necessary to make the positional relationship between the dielectric support 7 and the patch-shaped radiating element 2 accurate, so that the alignment when the dielectric support 7 is joined to the dielectric 3 is important. Therefore, a positioning notch 7b is provided on the lower end surface of the dielectric support 7, and the positioning is performed with the fixing jig inserted into the notch 7a as described in detail later. For example, accurate positioning can be performed.

Further, the provision of the notch 7a enables the antenna to be used for positioning when the antenna is mounted on another member, and the volume of the dielectric support 7 can be reduced to reduce the weight.

Regarding the position and number of the notches 7a, two are formed at symmetrical positions as shown in FIG. 5 or three at the symmetrical positions as shown in FIGS. 6 (a) and 6 (b). Alternatively, four can be formed, and more can be formed. Alternatively, as shown in FIG. 7, most of the lower end face of the dielectric support 7 can be formed as a notch 7b. Further, regarding the shape of the notch 7b, FIG.
The shape is not limited to the square groove as shown in FIGS. 8 to 7, and various shapes as shown in FIGS.

Then, as shown in FIG. 9, the fixing jig 1
3 is inserted into the notch 7b, and the dielectric support 7 is fixed. In this state, the planar radiating element 6 is formed on the side surface,
If the bonding of the dielectric 3 is performed, the positioning can be performed accurately.

Here, the width d of the notch 7b is 0.5
mm or more, more preferably 2 mm or more.
mm or more. This means that if the width d is smaller than this,
This is because the width e of the fixing jig 13 is also reduced, and the misalignment due to deformation of the fixing jig 13 such as bending is likely to occur.

The notch 7b has a depth h of 0.5 mm.
More preferably, it is more preferably 1.0
mm or more. This is because when the depth h is smaller than this, the fixing jig 13 does not enter sufficiently, and a positional shift is likely to occur.

Further, the difference D-d between the outer diameter D of the dielectric support 7 and the width d of the notch 7b is preferably at least 1 mm, more preferably at least 2 mm. This is D-d
Is smaller than this, as shown in FIG.
This is because the thickness t of the end face becomes too small, and chipping easily occurs in a manufacturing process or the like.

When the dielectric support 7 is formed of ceramics, the notch 7 is formed at the same time as molding such as press molding.
If b is formed, the manufacturing process can be simplified.

In this embodiment, the planar radiating element 6
In addition to joining a metal thin plate such as copper, it can be formed by printing on the side surface of the dielectric support 7 using a metal paste such as silver. Also in this case, if the dielectric support 7 is positioned by the fixing jig 13, the planar radiating element 6 can be accurately formed at a predetermined position.

Next, another embodiment of the present invention will be described.

The radiation element for a wide-angle circularly polarized antenna shown in FIG. 10A is the same as that of the above-described embodiment, except that the diameter D of the dielectric support 7 is smaller than the diameter D1 of the dielectric 3. . Therefore, when the planar radiating element 6 is provided on the side surface of the dielectric support 7, the outer diameter including the thickness of the planar radiating element 6 is
Can be prevented from becoming larger than the outer diameter D1, and the antenna can be miniaturized.

In order to exhibit such an effect, the difference D1-D between the diameter D1 of the dielectric 3 and the diameter D of the dielectric support 7 is 0.1 mm or more, and the dielectric support for the diameter D1 of the dielectric 3 is not less than 0.1 mm. It is preferable that the ratio D / D1 of the diameter D of the body 7 be 50% or more.

When the difference D1-D is less than 0.1 mm, when the planar radiating element 6 made of a thin metal plate is joined to the side surface of the dielectric support 7, its outer diameter is smaller than that of the dielectric 3. This is because there is a possibility that it will become larger. In addition, the above ratio D / D
If 1 is less than 50%, the antenna characteristics deteriorate.

Further, as shown in FIG. 10 (b), a bottom view as viewed from the dielectric support 7 side, the dielectric support 7 is formed into a prismatic shape, and the length of the diagonal line is set to be equal to or less than the diameter of the dielectric 3. You can keep it. In this way, even if the planar radiating element 6 is provided on the side surface of the dielectric support 7, it does not protrude beyond the outer diameter of the dielectric 3.

Further, the radiating element for a wide-angle circularly polarized antenna shown in FIG. 11 is the same as that of the above-described embodiment, except that a concave portion 7 a Are formed, and the planar radiating element 6 is embedded in the concave portion 7a. Therefore, it is possible to prevent the outer diameter including the thickness of the planar radiating element 6 from being larger than the outer diameter D1 of the dielectric 3, and to reduce the size of the antenna.

[0043]

EXAMPLE 1 As an example of the present invention, a radiating element for a wide-angle circularly polarized antenna shown in FIGS.

The dielectric 3 was formed of a Mg-Ca-Ti dielectric ceramic (dielectric constant 20), and had a diameter of 30 mm and a thickness of 10 mm. The dielectric support 7 was formed of an acrylic resin (dielectric constant 4), and had a diameter of 30 mm and a height of 20 mm. Further, the patch-shaped radiating element 2, the ground conductor plate 4, and the planar radiating element 6 are all formed of a copper thin plate, and are bonded with a double-sided tape. The support 7 was bonded to the side surface with a double-sided tape.

As a result, the positioning of the planar radiating element 6 and the patch radiating element 2 could be performed easily and accurately, and the antenna characteristics were good.

The outer peripheral portion of the end face of the dielectric support 7 is
(B) As shown in (c), when a chamfer 7a consisting of a C-plane having a width of 0.3 mm or an R-plane having a radius of curvature of 0.3 mm is formed, the connecting portion 5 can be smoothly bent. Good results were obtained.

Example 2 Next, as an example of the present invention, a radiation element for a wide-angle circularly polarized antenna shown in FIGS.

The materials and dimensions are the same as those of the first embodiment.
Dielectric support 7 is made of cordierite ceramics (dielectric constant 4)
After forming two notches 7b as shown in FIG. 5 by means of a mold at the time of press molding, it was obtained by firing under predetermined conditions. At this time, as shown in Tables 1 and 2, the notch 7b was manufactured by changing the width d and the depth h variously.

The planar radiating element 6 and the connecting portion 5 were formed separately from the ground conductor plate 4 and formed on the side surface of the dielectric support 7 by printing silver paste. At this time, the fixing jig 13 is inserted and fixed in the notch 7b of the dielectric support member 7, the surface radiating element 6 is printed using a curved surface printing machine, dried at a predetermined temperature, heated and baked. went. When printing a plurality of times, this step was repeated.

With the dielectric support 7 fixed in the same manner, the dielectric support 7 was bonded to the ground conductor plate 4 and the dielectric 3 with a double-sided tape while performing positioning. In each case, the fixing jig 1
The width e of No. 3 was 0.1 mm smaller than the width d of the notch 7b.

Using the thus obtained ten samples, the gain was measured in an anechoic chamber, and 2 dBi
The defect rate was examined for each of the cases where c or less was regarded as a sensitivity deterioration defect. The results are as shown in Tables 1 and 2. In addition, Table 1 changes the width d when the depth h of the notch 7b is 2 mm, and Table 2 changes the depth h when the width d is 2 mm.

From Table 1, the width d of the notch 7b is 0.5 m.
By setting the width to m or more, preferably 2 mm or more, the width e of the fixing jig 13 becomes large, so that deformation such as bending can be prevented and displacement can be prevented, so that the defective rate can be reduced. The difference D-d between the outer diameter D of the dielectric support 7 and the width d of the notch 7b is 1 mm or more, preferably 2 m.
It can also be seen that the occurrence of chipping defects can be reduced by setting m or more.

From Table 2, the depth h of the notch 7b is 0.5
It can be seen that when the thickness is not less than 1.0 mm, preferably not less than 1.0 mm, the fixing jig 13 can sufficiently enter the notch 7b and the displacement can be prevented, so that the defective rate can be reduced.

[0054]

[Table 1]

[0055]

[Table 2]

Embodiment 3 Next, as an embodiment of the present invention, a radiating element for a wide-angle circularly polarized antenna shown in FIG.

The materials and dimensions are the same as those in the second embodiment.
The diameter D of the dielectric support 7 was variously changed as shown in Table 3. The planar radiating element 6 was formed of a copper thin plate having a thickness of 0.05 mm, and was bonded to the side surface of the dielectric support 7 using a double-sided tape having a thickness of 0.05 mm.

Each sample was prepared two by two, and the gain was measured as the antenna characteristic in the same manner as in Example 2.
Degradation of 2 dBic or less was judged as good, and larger than 2 dBic was judged as good. Regarding the presence or absence of miniaturization, those smaller than the conventional product were evaluated as effective, and those not so were evaluated as ineffective. Furthermore, as for the presence or absence of weight reduction, those having a weight reduction of 10% or more as compared with the conventional product were evaluated as effective, and those not so were evaluated as ineffective. Thereafter, these were combined and evaluated on a three-point scale of ○ △ ×.

The results are as shown in Table 3. From this result, the difference D between the diameter D1 of the dielectric 3 and the diameter D of the dielectric support 7 is obtained.
1-D is not less than 0.1 mm and the diameter D of the dielectric 3
The ratio D / D1 of the diameter D of the dielectric support 7 to 1 is 50%
By doing so, it can be seen that miniaturization can be achieved while maintaining good antenna characteristics.

[0060]

[Table 3]

[0061]

As described above, according to the present invention, the patch-shaped radiating element and the ground conductor plate are arranged in parallel with each other via the dielectric, and the dielectric support is joined to the ground conductor plate side.
A radiating element for a wide-angle circularly polarized antenna having a plurality of planar radiating elements connected to the ground conductor plate disposed therearound, wherein the ground conductor plate and the plurality of planar radiating elements are integrally formed. By this, it is possible to accurately perform the alignment between the patch-shaped radiating element and the plurality of planar radiating elements simply by accurately aligning the ground conductor plate and the patch-shaped radiating element in advance, thereby improving the antenna characteristics. Can be.

Further, according to the present invention, in the above-described radiating element for a wide-angle circularly polarized antenna, since the dielectric support is provided with a notch for positioning, the planar radiating element is different from the ground conductor plate. Even when they are formed separately, the dielectric support having the planar radiating element and the patch-shaped radiating element can be joined while performing accurate positioning.

Further, according to the present invention, in the radiating element for a wide-angle circularly polarized antenna described above, the dielectric support has a smaller diameter than the dielectric, so that the planar radiating element provided on the side surface thereof is provided. The antenna can be miniaturized by preventing the thickness from protruding beyond the outer diameter of the dielectric.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a radiating element for a wide-angle circularly polarized antenna of the present invention, and FIG. 1B is a cross-sectional view taken along line XX in FIG.

FIG. 2 is a plan view of a ground conductor plate in the radiation element for a wide-angle circularly polarized antenna shown in FIG.

3 (a) to 3 (c) are diagrams showing a planar radiating element and a connecting portion in the radiating element for a wide-angle circularly polarized antenna shown in FIG.

FIG. 4 is a perspective view showing another embodiment of the radiation element for a wide-angle circularly polarized antenna of the present invention.

5A and 5B show a dielectric support in the radiating element for a wide-angle circularly polarized antenna shown in FIG. 4, wherein FIG. 5A is a side view and FIG.
Is an end view.

6 (a) and 6 (b) are views showing another embodiment corresponding to FIG. 5 (b).

7 shows another embodiment of the dielectric support shown in FIG. 5, (a) is a side view, and (b) is an end view.

FIGS. 8A to 8D are side views showing another embodiment of the dielectric support shown in FIG. 5;

9 shows a state in which a fixing jig is inserted into a cutout of the dielectric support shown in FIG. 5, (a) is an end view, and (b)
Is a side view.

FIG. 10A is a perspective view showing another embodiment of the radiation element for a wide-angle circularly polarized antenna of the present invention, and FIG. 10B is a bottom view showing still another embodiment.

FIG. 11 is a perspective view showing another embodiment of the radiation element for a wide-angle circularly polarized antenna of the present invention.

FIG. 12 is a perspective view showing a conventional radiation element for a wide-angle circularly polarized antenna.

[Explanation of symbols]

 1: Feeding pin 2: Patch-shaped radiating element 3: Dielectric 3a: Through hole 4: Ground conductor plate 4a: Hole 5: Connection part 6: Planar radiating element 7: Dielectric support 7a: Chamfer 7b: Notch 8: Coaxial line 8a: center conductor 9: microstrip planar antenna 10: composite planar radiating element

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takahito Morishima 1 at 10 Kawai, Gamo-cho, Gamo-gun, Shiga Prefecture Inside the Kyga Cera Co., Ltd. Shiga Plant 1 Kyocera Corporation Shiga Factory

Claims (4)

[Claims] 1. A patch-shaped radiating element and a ground conductor plate are arranged in parallel with each other via a dielectric, a dielectric support is joined to the ground conductor plate side, and the ground conductor is attached to a side surface of the dielectric support. A radiating element for a wide-angle circularly polarized antenna, comprising a plurality of planar radiating elements formed integrally with a plate. 2. A patch-shaped radiating element and a ground conductor plate are arranged in parallel with each other via a dielectric, and a dielectric support having a notch for positioning on the ground conductor plate side is joined thereto. A radiating element for a wide-angle circularly polarized antenna, comprising a plurality of planar radiating elements connected to the ground conductor plate on a side surface of a body. 3. A patch-shaped radiating element and a ground conductor plate are arranged in parallel with each other via a dielectric, and a dielectric support having a smaller diameter than the dielectric is joined to the ground conductor plate side. A radiating element for a wide-angle circularly polarized antenna, comprising a plurality of planar radiating elements connected to the ground conductor plate on a side surface of the antenna. 4. A patch-shaped radiating element and a ground conductor plate are arranged in parallel with each other via a dielectric, and a dielectric support is joined to the ground conductor plate side, and embedded in a side surface of the dielectric support. A radiating element for a wide-angle circularly polarized antenna in which a plurality of planar radiating elements connected to a ground conductor plate are arranged.