JP2003283239A - Antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device suppressing electromagnetic wave losses by reducing the specific dielectric constant of the place between a feeding excitation element and a parasitic excitation element, and placing the feeding and parasitic excitation elements at predetermined positions. <P>SOLUTION: An antenna device 1 comprises a first dielectric plate 104 with a grounded grounding conductor board 102 which is formed on the rear surface 103 of the first plate 104, a feeding excitation element 107 formed on a surface 105 of the first plate 104 to radiate electromagnetic waves, a second dielectric plate 109 of which the one surface 108 is placed opposite to the surface 105, and a parasitic excitation element 111 formed on the other surface 110 of the second plate 109 and electromagnetically connected to the excitation element 107 to radiate the electromagnetic waves toward external space. Between the first plate 104 and the second plate 109, leg parts 2 are placed around the excitation element 107, and space 3 with a small specific dielectric constant is formed between the excitation element 107 and the second plate 109. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device used for communication of a car telephone, for example.

[0002]

21 is a schematic vertical sectional view showing the structure of a conventional antenna device, and FIG. 22 is a perspective view of the antenna device shown in FIG. In addition, FIG.
It is an exploded perspective view of the antenna device in FIG. 21 to 23, the antenna device 101 includes a first dielectric plate 104 having a ground conductor plate 102 grounded on the back surface 103, and a front surface 105 of the first dielectric plate 104, and the back surface 103. The power supply excitation element 107 electrically connected to the power supply line 106 introduced from the above. The grounding conductor plate 102, the first dielectric plate 104, and the feed excitation element 107 form a radiation package 112. In addition, the antenna device 101 includes a second dielectric plate 109 arranged with one surface 108 facing the surface 105 of the first dielectric plate 104, and a parasitic power formed on the other surface 110 of the second dielectric plate 109. And an excitation element 111. Further, the antenna device 101 includes the dielectric spacer 11 sandwiched between the radiation package 112 and the second dielectric 109.
Equipped with 3.

The power feeding excitation element 107 is, for example, a circular metal foil, and is excited by the feeding of the RF signal from the power feeding line 106 to radiate an electromagnetic wave. Further, the parasitic excitation element 111 is, for example, a circular metal foil, and is excited by the electromagnetic wave emitted from the fed excitation element 107 to radiate the electromagnetic wave again to the external space. The feed excitation element 107 and the parasitic excitation element 111 are arranged in a line with the second dielectric plate 109 and the dielectric spacer 113 interposed therebetween.

Further, the feeder line 106 is used for the antenna device 10.
1 is an inner conductor of the coaxial cable 114 that is connected to 1. The outer conductor of the coaxial cable 114 is the ground conductor plate 10.
Connected to 2.

Next, the operation will be described. In such an antenna device 101, when the RF signal is fed to the feed exciting element 107 through the feed line 106, the feed exciting element 107 is excited. Excited feeding element 1
07 radiates an electromagnetic wave that is the first electromagnetic wave. This electromagnetic wave induces a coupling current on the parasitic excitation element 111 through the dielectric spacer 113 and the second dielectric plate 109,
The parasitic excitation element 111 is excited. The excited parasitic excitation element 111 radiates an electromagnetic wave, which is the second electromagnetic wave, to the external space. That is, the electromagnetic wave radiated by the feed excitation element 107 is electromagnetically coupled to the parasitic excitation element 111 and re-radiated by the parasitic excitation element 111.

[0006] Here, the feed excitation element 107 is the feed line 1
It is excited by the power feeding from 06, but this excitation is caused by the electric field generated in the power feeding excitation element 107 with the ground conductor plate 102 as a reference. In addition, the parasitic excitation element 11
1 is excited by electromagnetically coupling with the power feeding excitation element 107 by the electromagnetic wave from the power feeding excitation element 107,
This excitation is performed by connecting the grounding conductor plate 1 to the parasitic excitation element 111.
It is caused by the generation of an electric field with reference to 02. Therefore, the resonance frequency and impedance characteristics of the antenna device 101 are as follows: the first dielectric plate 104, the dielectric spacer 105, and the second dielectric plate between the ground conductor plate 102 and the feed excitation element 107 and the parasitic excitation element 111. It is determined by the relative permittivity and the thickness of each 109. First dielectric plate 104 and second dielectric plate 1
09 must have a certain strength or more in order to support the feed excitation element 107 and the parasitic excitation element 111, respectively, and cannot be easily removed. Therefore, the relative permittivity of the dielectric spacer 113 between them. That is, the resonance frequency and impedance characteristics of the antenna device 101 are adjusted by changing the material and the thickness.

Further, in this antenna device 101, the electromagnetic wave from the feed excitation element 107 reaches the parasitic excitation element 111 through the dielectric spacer 113 and the second dielectric plate 109.
Also, electromagnetic waves are lost when passing through the second dielectric plate 109. This loss becomes smaller as the relative dielectric constant when the dielectric spacer 113 and the second dielectric plate 109 are replaced with a single dielectric layer, that is, the smaller the equivalent relative dielectric constant,
This equivalent relative permittivity is reduced by reducing the relative permittivity of the dielectric spacer 113 whose relative permittivity can be adjusted. That is, the dielectric spacer 113 is a foam containing many bubbles.
The relative permittivity is reduced by securing as much space as possible inside. In addition, this dielectric spacer 1
Reference numeral 13 denotes the second dielectric plate 109 and the radiation package body 11.
The second dielectric plate 109 is bonded to the second dielectric plate 109 with an adhesive.
And the radiation package 112 is not separated. The dielectric spacer 113 is screwed to the second
It may be fixed to the dielectric plate 109 and the radiation package 112.

[0008]

However, although the dielectric spacer 113 is a foam, a large loss still occurs in the electromagnetic wave passing therethrough. There is a problem that this loss becomes an obstacle in improving the radiation efficiency of the antenna device 101.

Further, the dielectric spacer 113 is a bubble body in order to reduce the relative permittivity as described above,
For example, when the antenna device 101 is mounted on an aircraft, the temperature changes between the ground and the sky are large, so that water accumulates in the bubbles inside. Since the dielectric spacer 113 that has absorbed water has a large relative permittivity, there is also a problem that the loss of electromagnetic waves passing through the dielectric spacer 113 increases due to the accumulation of water in the bubbles due to the temperature change.

Further, since the dielectric spacer 113 is made of foam and is soft, it is difficult to keep the distance between the feed excitation element 107 and the parasitic excitation element 111 constant. The feed excitation element 107 and the parasitic excitation element 111
There is also a problem in that the relative permittivity of the dielectric spacer 113 changes and the characteristics such as the resonance frequency of the antenna device 101 change when the distance between the antenna and the antenna changes.

The characteristics such as the resonance frequency of the antenna device 101 are adjusted by changing the material and the thickness of the dielectric spacer 113. The dielectric spacer 113 is radiated by the second dielectric plate 109 and the radiation. Package body 1
Since it is sandwiched between the spacers 12, it is necessary to repeatedly perform the adjustment of removing the dielectric spacer 113, changing its material and thickness, and reassembling in order to obtain a desired relative permittivity. This adjustment requires a lot of time and is expensive.

When the antenna device 101 is assembled, the dielectric spacer 1 is placed on the radiation package 112.
13 is stacked, and the second dielectric plate 109 having the parasitic excitation element 111 formed thereon is stacked thereon. When the dielectric spacer 113 overlaps the radiation package body 112, the second dielectric plate 109 is formed on the first dielectric plate 104. The position of the feeding and exciting element 107 cannot be specified because the fed and exciting element 107 which has been turned off becomes invisible. Therefore, there is a problem that it is very difficult to arrange the parasitic excitation element 111 so as to be accurately aligned with the feeding excitation element 107.

Further, since the dielectric spacer 113 is fixed to the second dielectric plate 109 and the radiation package 112 with an adhesive, the equivalent relative permittivity between the feed excitation element 107 and the parasitic excitation element 111 is increased. Therefore, there is a problem that the loss of electromagnetic waves is further increased. Further, even when the dielectric spacer 113 is fixed by screws, there is a problem that the number of parts increases, the assembly work takes time, and the cost increases.

In addition, when a large number of the antenna devices 101 are arranged, the work of assembling each antenna device 101 one by one occurs, resulting in a low work efficiency and a long time.

Further, the antenna device 101 is provided with a coaxial cable 114 from the outside in order to excite the feed excitation element 107.
However, there is a problem in that the connecting parts of the coaxial cable 114 are obstacles to shortening of assembly time and cost reduction.

Therefore, the present invention has an object to solve the above problems, and suppresses the loss of electromagnetic waves by reducing the relative permittivity between the feed excitation element and the parasitic excitation element. At the same time, it is an object to obtain an antenna device in which a feed excitation element and a parasitic excitation element are arranged at predetermined positions.

[0017]

In the antenna device according to the present invention, a grounded ground conductor plate is provided on the back surface of the antenna device.
A dielectric plate, a feed excitation element that is provided on the surface of the first dielectric plate and radiates a first electromagnetic wave by feeding power, a second dielectric plate having one surface facing the surface, and the one surface And a parasitic excitation element that is provided on any one of the other surface and radiates a second electromagnetic wave generated by electromagnetically coupling the first electromagnetic wave to the external space, and is disposed between the surface and the one surface. And a leg portion contacting the first dielectric plate and the second dielectric plate so that at least a space is present between the feed excitation element and the parasitic excitation element. It has become.

Further, one end of the leg portion is fixed to one of the surface of the first dielectric plate and the one surface of the second dielectric plate, and the other end of the leg portion is fixed to the other. Positioning means are provided for arranging the ends at predetermined positions.

The positioning means is a recess provided at the predetermined position into which the other end of the leg is fitted.

The second dielectric plate is interposed between the feed excitation element and the parasitic excitation element, and the thickness of the second dielectric plate is the feed excitation element and the parasitic element. It is large in the area between the excitation elements.

A plurality of sets of the feed excitation element and the parasitic excitation element are provided, each of the feed excitation elements is provided on one of the first dielectric plates, and each of the parasitic excitation elements is It is provided on the plurality of second dielectric plates corresponding to the parasitic excitation element, and the legs are respectively arranged between the second dielectric plates and the first dielectric plates.

Further, a plurality of sets of the feed excitation element and the parasitic excitation element are provided, and each of the feed excitation elements is provided on each of the first dielectric plates corresponding to each of the feed excitation elements. The feed excitation element is provided on one of the second dielectric plates, and the legs are arranged between each of the first dielectric plate and the second dielectric plate.

Further, a plurality of sets of the feed excitation element and the parasitic excitation element are provided, and each of the feed excitation element and each of the parasitic excitation elements includes one first dielectric plate and one sheet of the first dielectric plate. Two dielectric plates are provided respectively.

Further, a power supply source for supplying the power is provided inside the first dielectric plate, and the power supply source is electrically connected to the power supply excitation element.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. The same or equivalent members and parts as those of the conventional example are designated by the same reference numerals. Embodiment 1. 1 is a schematic vertical cross-sectional view showing the configuration of an antenna device according to Embodiment 1 of the present invention. 2 is a perspective view of the antenna device shown in FIG. 1, and FIG. 3 is an exploded perspective view of the antenna device in FIG. 1 to 3, the antenna device 1 has a first grounding conductor plate 102 formed on a back surface 103.
The dielectric plate 104 and the surface 10 of the first dielectric plate 104
5, the power supply line 106 introduced from the back surface 103
And a power feed excitation element 107 electrically connected to the. The grounding conductor plate 102, the first dielectric plate 104, and the feed excitation element 107 form a radiation package 112. Further, the antenna device 1 has the first surface 108 as the first surface.
The second dielectric plate 109 arranged toward the surface 105 of the dielectric plate 104, and the other surface 110 of the second dielectric plate 109.
And a parasitic excitation element 111 formed on the. Further, the antenna device 1 includes the surface 1 of the first dielectric plate 104.
05 and the one surface 108 of the second dielectric plate 109, the leg portion 2 is provided.

The leg portions 2 have, for example, a columnar shape, and four leg portions 2 are arranged around the leg portions 2 so as not to come into contact with the feed excitation elements 107. The leg 2 is formed by the first dielectric plate 1
04 surface 105 and one surface 108 of the second dielectric plate 109.
, And is fixed with an adhesive or a screw. It is desirable that the legs 2 have a small relative permittivity, and they are not easily deformed by the force acting on the antenna device 1. Further, the height h of the leg portion 2 is larger than the thickness of the power feeding excitation element 107, the power feeding excitation element 107 is provided apart from the one surface 108 of the second dielectric plate 109, and The space 3 is interposed between the second dielectric plate 109 and the second dielectric plate 109. Therefore, the electromagnetic wave from the power feeding excitation element 107 is designed to pass through the space 3 without the leg 2 becoming an obstacle.

The power feeding excitation element 107 is, for example, a circular metal foil, and is excited by the feeding of the RF signal from the power feeding line 106 to radiate the electromagnetic wave which is the first electromagnetic wave. Similarly, the parasitic excitation element 111 is, for example, a circular metal foil, and is excited by the electromagnetic wave emitted by the feed excitation element 107 to emit the second electromagnetic wave to the external space again. . This feed excitation element 10
7 and the parasitic excitation element 111 are arranged in a line through the second dielectric plate 109 and the space 3.

The power supply line 106 is connected to the antenna device 10.
1 is an inner conductor of the coaxial cable 114 that is connected to 1. The outer conductor of the coaxial cable 114 is the ground conductor plate 10.
Connected to 2.

The antenna device 1 having such a configuration is shown in FIG.
It is assembled as shown in. That is, the ground conductor plate 102 is formed in advance on the back surface 103 of the first dielectric 104, and the power feeding excitation element 104 is formed on the front surface 105 to form the radiation package 112. On the other hand, in the second dielectric plate 109, one end 2a of the leg 2 is fixed to one surface 108 of the second dielectric plate 109 with an adhesive, and the parasitic excitation element 111 is formed on the other surface 110. The second dielectric plate 109 on which the parasitic excitation element 111 is formed is the surface 1 of the radiation package 112.
The other end portion 2b of the leg portion 2 arranged on the 05 side and fixed to the second dielectric plate 109 is placed on the surface 105. At this time, the parasitic excitation element 111 is arranged above the feeding excitation element 107, and the leg portion 2 has the feeding excitation element 107.
Be placed around it so that it does not touch.
The other end portion 2b of the leg portion 2 also has the same first end portion 2a as the first end portion 2a.
It is fixed to the dielectric plate 104 with an adhesive.

Next, the operation will be described. In such an antenna device 101, when the RF signal is fed to the feed exciting element 107 through the feed line 106, the feed exciting element 107 is excited. Excited feeding element 1
07 radiates an electromagnetic wave that is the first electromagnetic wave. This electromagnetic wave passes through the space 3 and the second dielectric plate 109, induces a coupling current on the parasitic excitation element 111, and excites the parasitic excitation element 111. Excited parasitic excitation element 1
The reference numeral 11 radiates an electromagnetic wave, which is the second electromagnetic wave, to the external space. That is, the electromagnetic wave radiated by the feed excitation element 107 is electromagnetically coupled to the parasitic excitation element 111 and re-radiated by the parasitic excitation element 111.

As described above, in the antenna device 1, the leg portion 2 is provided between the first dielectric plate 104 and the second dielectric plate 109.
Since the space 3 is formed between the feeding excitation element 107 and the second dielectric plate 109, the space 3 having a relative dielectric constant much smaller than that of the dielectric spacer 113 of the conventional example is formed. The relative permittivity with the excitation element 111, that is, the equivalent relative permittivity of the second dielectric plate 109 and the space 3 is small. In addition, the leg portion 2 is the power feeding excitation element 1
Since it is placed around 07, the loss of electromagnetic waves is
Has almost no effect. Therefore, the electromagnetic wave radiated from the feed excitation element 107 can reach the parasitic excitation element 111 with a smaller loss than the conventional example. From this,
The antenna device 1 has less loss than the conventional example and can efficiently convert the vibration electromagnetic energy of the RF signal into an electromagnetic wave and radiate it. Further, when the antenna device 1 receives an electromagnetic wave and converts it into the vibration electromagnetic energy of the RF signal, the radiation process is simply followed in reverse, so that the loss of the electromagnetic wave can be similarly suppressed and the efficiency can be improved. Electromagnetic waves can be converted into vibrating electromagnetic energy.

Further, in the antenna device 1, since only the space 3 exists between the feed excitation element 107 and the second dielectric plate 109, when the antenna device 1 is mounted on an aircraft and there is a large temperature difference, for example. However, unlike the dielectric spacer 113 of the conventional example, the space 3 does not absorb water and store water. Therefore, the equivalent relative permittivity of the second dielectric plate 109 and the space 3 does not suddenly increase, and the loss of electromagnetic waves passing through the second dielectric plate 109 and the space 3 does not increase rapidly. From this, the antenna device 1 is
Even in an environment where the temperature changes greatly, fluctuations in electromagnetic wave loss are suppressed.

Further, the leg portion 2 is the dielectric spacer 1 of the conventional example.
Since it is less likely to be deformed than 13, the change in the height h is small. Therefore, the feed excitation element 107 and the second dielectric plate 10
The change in the distance from the antenna 9 is smaller than that in the conventional example, and the antenna device 1 can stably maintain desired characteristics such as the resonance frequency.

Further, the power feeding drive element 107 is provided with a second upper portion.
Even when the dielectric plate 109 is arranged, the position of the leg 2 can be confirmed by the fact that the leg 2 is interposed between the first dielectric plate 104 and the second dielectric plate 109. Therefore, since the position of the parasitic excitation element 111 can be determined while confirming the position of the feeding excitation element 107, the positioning of the parasitic excitation element 111 becomes easier than in the conventional example.

Further, the leg portion 2 is adhered and fixed to the first dielectric plate 104 and the second dielectric plate 109 by an adhesive agent, and this adhesive agent connects the feeding excitation element 107 and the parasitic excitation element 111. Since it does not exist between them, it hardly affects the loss of electromagnetic waves. Therefore, the loss of electromagnetic waves due to the adhesive is significantly smaller than that in the conventional example.

The leg portion 2 is arranged around the feed excitation element 107 without making contact therewith, and has a contact area such that the first dielectric plate 104 and the second dielectric plate 109 are not detached. Since it is sufficient, it is not limited to the cylindrical shape,
For example, a prism such as a triangular prism or a square prism, a cylindrical shape, or a cross-sectional area or a cross-sectional shape may be different depending on the portion.
Further, the number of legs 2 is sufficient as long as the power feeding excitation element 107 and the second dielectric plate 109 are kept in a separated state.
Any number will do.

Further, in the above embodiment, the antenna device 1 has the one end portion 2a of the leg portion 2 adhered and fixed to the one surface 108 of the second dielectric plate 109, and then the surface 1 of the first dielectric plate 104.
The other end portion 2b of the leg portion 2 is bonded and fixed to the inner surface of the leg portion 05, and the leg portion 2 is naturally assembled on the surface 105 after the other end portion 2b is fixed to the surface 105.
The antenna device 1 may be assembled by being bonded and fixed to the antenna 8. Further, the fixing of the one end portion 2a and the other end portion 2b is
Not only fixing with an adhesive or screws, but also heat welding or pins may be used.

Further, the leg portion 2 does not have to be manufactured separately from the first dielectric plate 104 and the second dielectric plate 109, and the first dielectric plate 104 and the leg portion 2 are, for example, cut or molded. The same member may be integrally formed by processing, or the second dielectric plate 109 and the leg portion 2 may be similarly integrally formed.

The feeding excitation element 107 and the parasitic excitation element 111 are formed on the first dielectric plate 104 and the second dielectric plate 109, respectively. The forming method is, for example, a method of forming by metal plating, A feeding excitation element 107 and a non-feeding excitation element 111 are formed on the first dielectric plate 104 and the second dielectric plate 109, respectively, by a method of attaching a metal foil, a method of transferring a powder metal in a paste form by a binder, or the like. Any method will do as long as it is done.

Further, in the above embodiment, the feed excitation element 107 and the parasitic excitation element 111 are flat microstrip antennas, but any antenna method such as a dipole antenna or a spiral antenna can be used. It doesn't matter.

Further, in the above-mentioned embodiment, although the feeding excitation element 107 and the parasitic excitation element 111 are flat conductors, they are not limited to flat conductors, and for example, the surface of the first dielectric plate 104 may be used. 105 and second dielectric plate 109
The other surface 110 may not be a flat surface but may have unevenness on each side, and the feeding excitation element 107 and the parasitic excitation element 111 may be formed along the unevenness. That is, even if the feeding excitation element 107 and the parasitic excitation element 111 are gently curved, for example, even if the surface is partially curved, the feeding excitation element 107 radiates an electromagnetic wave and the parasitic excitation element 111 causes an electromagnetic wave. It suffices that the electromagnetic waves can be re-radiated to the outside by the physical coupling.

Further, as shown in FIG. 4, even if the parasitic excitation element 111 is formed on the one surface 108 of the second dielectric plate 109, the same effect can be obtained. In this case, as a matter of course, the leg portion 2 is arranged so as not to come into contact with the parasitic excitation element 111 either.

Embodiment 2. FIG. 5 is a schematic perspective view showing an assembly process of the antenna device according to the second embodiment of the present invention. 6 is a top view of the radiation package body of FIG. 5, and FIG. 7 is a sectional view taken along line VII-VII of FIG. 5 to 7, the antenna device 11
Includes a first dielectric plate 104 having a recess 12 as a positioning means formed on the surface 105 side. The recess 12 is
It is formed around the power feed excitation element 107, and the other end portion 2 b of the leg portion 2 is fitted into the recess 12. Therefore, the cross-sectional area and cross-sectional shape of the recess 12 are substantially the same as the cross-sectional area and cross-sectional shape of the leg portion 2. This recess 12
Is the other end 2 of the leg 2 fixed to the second dielectric plate 109.
The second dielectric plate 1 is inserted when b is fitted.
The parasitic excitation elements 111 formed in No. 09 are arranged so as to be aligned with the feed excitation element 107. The depth d of the recess 12 is smaller than the height h of the leg 2, so that the space 3 is formed between the feed excitation element 107 and the second dielectric plate 109 in the assembled state. It has become. The leg portion 2 is configured so as not to separate from the recess 12 by being bonded with an adhesive. Note that other configurations and operations are similar to those of the first embodiment.

The antenna device 11 thus configured
Has the same effects as the first embodiment, and
The recess 12 is formed in the dielectric plate 104, and the position of the parasitic excitation element 111 formed in the second dielectric plate 109 can be determined only by fitting the other end 2b of the leg 2 into the recess 12. Therefore, the parasitic excitation element 111 can be easily positioned with respect to the fed excitation element 107.

It should be noted that the concave portion is one surface 1 of the second dielectric plate 109.
Even if it is formed on the 08 side, the same effect is obtained. Also,
As a matter of course, the concave portions are formed on the first dielectric plate 104 and the second dielectric plate 104.
It may be formed on both of the dielectric plates 109. In this case, the height h of the legs 2 is
It is larger than the sum of the depths of both the recesses formed in the first dielectric plate 104 and the recesses formed in the second dielectric plate 109.

Further, the other end 2b of the leg portion 2 is provided in the recess 12.
As long as it can be fitted, the shape of the recess 12 may be, for example, a conical tapered shape or a groove shape. In this case, the leg portion 2 is formed along the shape of the recess 12.

Further, as shown in FIG. 8, the positioning means may be a step 13 formed on the first dielectric plate 104. As a matter of course, this step is caused by the second dielectric plate 1
09, the first dielectric plate 104 and the second dielectric plate 104.
It may be formed on both of the dielectric plates 109.

FIG. 9 is a cross-sectional view showing a process of fitting the leg portion, the other end portion of which is substantially spherical, into the recess formed in the first dielectric plate, and FIG. 10 shows the leg portion of FIG. It is sectional drawing which shows the state fitted in the recessed part. As shown in FIGS. 9 and 10, the other end portion 2b of the leg portion 2 has a substantially spherical shape, and
The shape of 2 may have a substantially conical shape such that the cross-sectional area increases as the depth increases. In this way, the other end 2
In the state where b is fitted in the recess 12, the upper portion of the recess 12 is engaged between the end 2b and the leg 2 main body portion so that the leg 2
Does not separate from the recess 12. That is, with such a configuration, when the substantially spherical other end 2b is inserted into the recess 12, the other end 2b is pushed into the recess 12, and its shape is elastic along the cross-sectional shape of the upper part of the recess 12. Since it deforms and enters the inside of the recess 12, and the shape of the other end 2b is restored inside the recess 12 and the other end 2b is fitted into the recess 12, the space between the end 2b and the leg 2 main body portion is not changed. The upper portions are engaged with each other, so that the leg portion 2 can be easily fixed to the recess 12 without using an adhesive.

Embodiment 3. FIG. 11 is a sectional view showing the structure of the antenna device according to the third embodiment of the present invention. In FIG. 11, the antenna device 21 includes a second dielectric plate 109 having a thick portion 109a having a larger thickness than other portions. The thick portion 109a is located in the region between the feed excitation element 107 and the parasitic excitation element 111. The other surface 110 of the second dielectric plate 109 is a flat surface, and as a result, the thick portion 109a projects toward the feed excitation element 107 more than other portions.
The shape of the thick portion 109a viewed from the upper surface is circular. In addition, the thick portion 109a and the power feeding excitation element 107
A space 3 is formed between and. Other configurations and operations are the same as those in the first embodiment.

The antenna device 21 having such a structure has the same effect as that of the first embodiment, and the space 3 and the thick portion 109a are interposed between the feed excitation element 107 and the parasitic excitation element 111. Therefore, the thick portion 109a
The equivalent relative permittivity between the feed excitation element 107 and the parasitic excitation element 111 can be changed by shaving the surface on the side of the space 3 with a file or the like. Therefore, the antenna device 21
Even after it has been assembled, the thick part 10
The equivalent relative permittivity between the feed excitation element 107 and the parasitic excitation element 111 can be changed only by cutting 9a.
The resonance frequency and the impedance characteristic of the antenna device 21 can be easily adjusted.

The thick portion 109a is required to have a circular shape when viewed from the top since the equivalent relative permittivity between the feed excitation element 107 and the parasitic excitation element 111 may be changed by cutting. However, it may have any shape such as a quadrangle or a triangle, and may have a pyramidal shape or a partial spherical shape instead of a columnar shape.

If the electromagnetic wave from the feed excitation element 107 can be electromagnetically coupled to the parasitic excitation element 111, the other surface 110 does not need to be a flat surface, so the thick portion 109
The a may not be projected only on the space 3 side, may be projected on the other surface 110 side, or may be projected on both sides.

When the configuration of the second embodiment is applied to the antenna device according to the third embodiment, the same effect as that of the second embodiment can be obtained.

Fourth Embodiment FIG. 12 is a schematic side view showing the configuration of the antenna device according to the fourth embodiment of the present invention. In FIG. 12, the antenna device 31 includes a plurality of sets of the feed excitation element 107 and the parasitic excitation element 111. In addition, the antenna device 31 includes a single second element in which the plurality of parasitic excitation elements 111 are all formed on the other surface 110.
A dielectric plate 32 is provided. Each feed excitation element 107 is
The plurality of radiation packages 112 are formed on the plurality of first dielectric plates 104, respectively, and are similar to those of the first embodiment. The leg portion 2 is arranged between the first dielectric plate 104 and the second dielectric plate 109 of each radiation package body 112, and for each radiation package body 112 similarly to the first embodiment. The legs 2 are each the first dielectric plate 104.
And fixed to the second dielectric plate 32. Each feed excitation element 107 is arranged to face each corresponding parasitic excitation element 111 via the space 3 and the second dielectric plate 32. Note that other configurations and operations are similar to those of the first embodiment.

In the antenna device 31 having such a configuration, a plurality of parasitic excitation elements 111 are provided on one second dielectric plate 32.
Since the plurality of radiating package bodies 112 are formed via the leg portions 2 and are fixed to each other, not only the distance between each of the feed excitation elements 107 and each of the parasitic excitation elements 111 but also between the feed excitation elements 107 and The parasitic excitation elements 111 can also be accurately arranged at desired intervals. Therefore, the RF that supplies power to each power supply excitation element 107 through the power supply line 106.
By controlling the amplitude and phase of the signal, the antenna device 31 can operate as a phased array antenna.

Further, since a plurality of parasitic excitation elements 111 can be formed on one second dielectric plate 109 at one time, the assembling work of the antenna device 31 can be facilitated and the assembling time can be shortened.

Even if the plurality of parasitic excitation elements 111 are not formed on the single second dielectric plate 109, FIG.
As shown in FIG.
Even if formed on the dielectric plate 33, a plurality of feed excitation elements 107 are formed on the basis of one first dielectric plate 33 and are formed on each second dielectric plate 109 via the leg portions 2. Since each parasitic excitation element 111 is arranged, the same effect can be obtained.

Further, as a matter of course, as shown in FIG. 14, a plurality of feeding excitation elements 107 are formed on one first dielectric plate 33, and a plurality of parasitic excitation elements 11 are formed.
Even if 1 is formed on one second dielectric plate 32, the same effect is obtained. Further, with this configuration, since the number of the first dielectric plate 33 and the number of the second dielectric plate 32 are each one, this antenna device can reduce the number of legs 2 that form the space 3, and reduce the cost of parts. And the assembly work time is further shortened.

When the configurations of Embodiments 2 and 3 are applied to the antenna device according to this embodiment, the same effects as those of Embodiments 2 and 3 can be obtained.

Fifth Embodiment FIG. 15 is a sectional view showing the structure of the radiation package body of the antenna device according to the fifth embodiment of the present invention. In FIG. 15, the antenna device 4
1 includes a first dielectric plate 43 having therein an active circuit 42 such as an amplifier or a transmitter which is a power supply for supplying an RF signal to the power supply excitation element 107. The first dielectric plate 43 includes an upper dielectric part 44 on which the power feeding excitation element 107 is formed and a lower dielectric part 4 on which the ground conductor plate 102 is formed.
Have five. The active circuit 42 is formed on a substrate 46 made of ceramic. The active circuit 42 and the substrate 46 form a power feeder 47. The power feeding body 47 includes an upper dielectric portion 44 and a lower dielectric portion 45.
And is embedded in the first dielectric plate 43. The lower dielectric part 45 has a recess 4 on the upper dielectric part 44 side.
5a. The depth of the recess 45a and the thickness of the power feeding body 47 are substantially the same. A power feeding body 47 is fitted in the hollow portion 45 a, and an upper dielectric portion 44 is covered on the power feeding body 47 and is fixed at a contact portion between the lower dielectric portion 45 and the power feeding body 47. The power feeder 47 is fitted in the recess 45a with the active circuit 42 facing the upper dielectric portion 44 side. Further, the active circuit 42 has a surface 105
Is electrically connected to the power-feeding excitation element 107 formed in the above through a power feeding circuit 48 such as a transmission line. The power supply circuit 48 passes through the inside of the upper dielectric portion 44. In the power feeding circuit 48, for example, a metal line formed by etching or the like between a plurality of layers (for example, two layers) of dielectric layers forming the upper dielectric portion 44 is connected to a metal plating formed in a through hole of each dielectric layer Are formed. Other configurations and operations are the same as those in the first embodiment.

The antenna device 41 configured as described above
Has the same effects as the first embodiment, and
Since the active circuit 42, which is a power supply for RF signals, is arranged inside the dielectric plate 104, power supply from the outside is unnecessary, and connection components such as the conventional coaxial cable 114 are not necessary. As a result, the number of parts is reduced, the cost of parts is reduced, and the assembling work is facilitated. Further, since the work of connecting the connecting parts such as the coaxial cable 114 to the outside of the antenna device 41 by soldering or the like is eliminated, the yield in the production line is improved and the antenna device 41 of stable quality can be efficiently produced. .

The upper dielectric portion 44 does not have to be composed of a plurality of dielectric layers, and the active circuit 42 and the power feeding excitation element 107 may be electrically connected by the power feeding circuit 48. The active circuit 42 and the power feeding excitation element 107 may be electrically connected to each other by using a metal plating formed in a through hole penetrating the single-layer upper dielectric portion 44 as a power feeding circuit.

Since the power feeding body 47 only needs to be arranged inside the first dielectric plate 104, the depth in the upper dielectric portion 44 is substantially the same as the thickness of the power feeding body 47, as shown in FIG. The recess 44a may be provided, the lower dielectric part 45 may be a flat plate, and the power feeding body 47 may be fitted in the recess 44a. Also, as shown in FIG.
Both the upper dielectric part 44 and the lower dielectric part 45 may be provided with a recess 44a and a recess 45a, respectively.
In this case, the total depth of the recesses 44 a and the recesses 45 a is substantially the same as the thickness of the power feeding body 47.

Further, as shown in FIG.
The active circuit 42 may be fitted into the recess 45a so that the active circuit 42 faces the lower dielectric part 45 side. in this case,
The power feeding circuit 48 electrically connects the active circuit 42 and the power feeding excitation element 107 through the inside of both the lower dielectric part 45 and the upper dielectric part 44. In addition, similarly to FIGS. 16 and 17, as shown in FIG.
4 may be provided with a depression 44a, or as shown in FIG. 20, the upper dielectric portion 44 and the lower dielectric portion 45 may be provided with a depression 44a and a depression 45a, respectively.

Further, when the configurations of the second to fourth embodiments are applied to the antenna device according to the present embodiment, the same effects as those of the second to fourth embodiments can be obtained.

[0066]

As is apparent from the above description, in the antenna device according to the present invention, the first dielectric plate having the grounded conductor plate provided on the back surface and the surface of the first dielectric plate are provided. A power supply excitation element that is provided to radiate a first electromagnetic wave by power supply; a second dielectric plate having one surface opposed to the surface; and one of the one surface and the other surface. A parasitic excitation element that radiates a second electromagnetic wave generated by electromagnetically coupling the electromagnetic wave to the external space;
A leg disposed between the surface and the one surface,
Since the leg portion is in contact with the first dielectric plate and the second dielectric plate, at least a space is interposed between the feed excitation element and the parasitic excitation element. The equivalent relative permittivity between the feed excitation element and the parasitic excitation element is reduced, the loss of the first electromagnetic wave radiated from the feed excitation element can be reduced, and the relative permittivity of the space is reduced. Does not change significantly, so that the desired resonance frequency and impedance characteristics of the antenna device can be stably maintained.

One end of the leg portion is fixed to one of the surface of the first dielectric plate and the one surface of the second dielectric plate, and the other end of the leg portion is fixed to the other. Since the positioning means for arranging the end portion at a predetermined position is provided, the parasitic excitation element can be easily and accurately positioned with respect to the fed excitation element.

Further, since the positioning means is a recess provided at the predetermined position into which the other end of the leg is fitted, it is easy to position the parasitic excitation element with respect to the feeding excitation element. , And be accurate.

Further, the second dielectric plate is interposed between the feed excitation element and the parasitic excitation element, and the thickness of the second dielectric plate is the feed excitation element and the parasitic element. Since it is large in the area between the excitation elements, the thickness of the second dielectric plate in the area is changed by shaving with a file or the like, so that the antenna can be easily assembled even after the antenna device is assembled. The resonance frequency and impedance characteristics of the device can be adjusted.

Further, a plurality of sets of the feed excitation element and the parasitic excitation element are provided, each of the feed excitation elements is provided on one of the first dielectric plates, and each of the parasitic excitation elements is The second dielectric plates are provided on the plurality of second dielectric plates corresponding to the parasitic excitation element, and the legs are arranged between the second dielectric plates and the first dielectric plates. Arrangement between each of the feed excitation elements, between each of the parasitic excitation elements, and between each of the feed excitation elements and each of the parasitic excitation elements with reference to the first dielectric plate. The accuracy of the spacing is increased, and the antenna device can operate as a phased array antenna.

Further, a plurality of sets of the feed excitation element and the parasitic excitation element are provided, and each of the feed excitation elements is provided on each of the first dielectric plates corresponding to each of the feed excitation elements. The feed excitation element is provided on one of the second dielectric plates, and the legs are arranged between the first dielectric plate and the second dielectric plate, respectively.
With the one second dielectric plate as a reference, between each of the feed excitation elements, between each of the parasitic excitation elements, and between each of the feed excitation elements and each of the parasitic excitation elements. The accuracy of the arrangement interval is improved, and the antenna device can operate as a phased array antenna.

Further, a plurality of sets of the feed excitation element and the parasitic excitation element are provided, and each of the feed excitation element and each of the parasitic excitation elements includes one first dielectric plate and one sheet of the first dielectric plate. 2 Since they are respectively provided on the dielectric plates, arrangement between each of the feed excitation elements, between each of the parasitic excitation elements, and between each of the feed excitation elements and each of the parasitic excitation elements Since the accuracy of the spacing is improved, the antenna device can operate as a phased array antenna, and the first dielectric plate and the second dielectric plate need only be supported, respectively. The number of components is reduced, the cost of parts is reduced, and the assembly work time of the antenna device is also reduced.

Further, the power supply for supplying the power is provided inside the first dielectric plate, and the power supply is electrically connected to the power supply excitation element, so that the antenna device is provided. Since the work of connecting to the power supply outside the device is eliminated, the yield in mass production of the antenna device is improved, and the stable antenna device can be efficiently produced.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a configuration of an antenna device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the antenna device shown in FIG.

FIG. 3 is an exploded perspective view of the antenna device in FIG.

FIG. 4 is a vertical cross-sectional view of an antenna device in which a parasitic excitation element is formed on one surface of a second dielectric plate in FIG.

FIG. 5 is a schematic perspective view showing an assembly process of the antenna device according to the second embodiment of the present invention.

6 is a top view of the radiation package body of FIG. 5. FIG.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a perspective view of a radiation package body in which a step is provided on a front surface side of a first dielectric plate.

FIG. 9 is a cross-sectional view showing a process of fitting a leg portion, the other end portion of which is substantially spherical, into a recess formed in the first dielectric plate.

FIG. 10 is a cross-sectional view showing a state in which the leg portion of FIG. 9 is fitted in a recess.

FIG. 11 is a sectional view showing a configuration of an antenna device according to a third embodiment of the present invention.

FIG. 12 is a schematic side view showing the configuration of the antenna device according to the fourth embodiment of the present invention.

FIG. 13 is a side view showing an antenna device in which a plurality of feed excitation elements are formed on one first dielectric plate and each parasitic excitation element is formed for each of a plurality of second dielectric plates.

FIG. 14 is a side view showing an antenna device in which a plurality of feed excitation elements are formed on one first dielectric plate and a plurality of parasitic excitation elements are formed on one second dielectric plate.

FIG. 15 is a schematic cross-sectional view showing a configuration of a radiation package body of an antenna device according to a fifth embodiment of the present invention.

FIG. 16 is a schematic cross-sectional view showing the configuration of a radiation package body in which a recess is provided in the upper dielectric portion.

FIG. 17 is a schematic cross-sectional view showing a configuration of a radiation package body in which a recess is provided in each of an upper dielectric portion and a lower dielectric portion.

FIG. 18 is a schematic cross-sectional view showing a configuration of a package body in which a power feeding body is arranged with the active circuit in FIG. 15 facing a lower dielectric portion side.

19 is a schematic cross-sectional view showing the configuration of a package body in which a power feeding body is arranged with the active circuit in FIG. 16 facing the lower dielectric part side.

20 is a schematic cross-sectional view showing the configuration of a package body in which a power feeding body is arranged with the active circuit in FIG. 17 facing the lower dielectric part side.

FIG. 21 is a schematic vertical sectional view showing a configuration of a conventional antenna device.

22 is a perspective view of the antenna device shown in FIG. 21. FIG.

FIG. 23 is an exploded perspective view of the antenna device in FIG. 22.

[Explanation of symbols]

1, 11, 21, 31, 41 Antenna device, 2 Legs, 3 Space, 12 Recess (positioning means), 13 Step (positioning means), 32 One second dielectric plate, 33
One first dielectric plate, 42 active circuit (power supply), 43 first dielectric plate, 48 feeding circuit, 102
Ground conductor plate, 103 back surface, 104 first dielectric plate, 1
05 front surface, 107 power feeding excitation element, 108 front surface, 1
09 second dielectric plate, 110 other surface, 111 parasitic excitation element.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takato Fukui             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5J021 AA06 AA11 AB06 CA03 CA06                       FA24 FA26 HA05                 5J045 AA05 AB06 BA01 DA10 EA07                       EA08 HA03 HA06 MA07 NA03

Claims (8)

[Claims] 1. A first dielectric plate having a grounded ground conductor plate provided on the back surface thereof, a feed excitation element which is provided on the surface of the first dielectric plate and radiates a first electromagnetic wave by feeding power, A second dielectric plate whose one surface is opposed to the surface, and a second electromagnetic wave which is provided on either one of the one surface and the other surface and which is generated by electromagnetically coupling the first electromagnetic wave to the external space. A parasitic excitation element that radiates to, and a leg portion disposed between the surface and the one surface, the leg portion being in contact with the first dielectric plate and the second dielectric plate, An antenna device, wherein at least a space is interposed between the feed excitation element and the parasitic excitation element. 2. One end of the leg portion is fixed to one of the surface of the first dielectric plate and the one surface of the second dielectric plate, and the other end of the leg portion is fixed to the other. 2. Positioning means for disposing the end portion at a predetermined position is provided.
The antenna device according to. 3. The antenna device according to claim 2, wherein the positioning means is a recess provided at the predetermined position into which the other end of the leg is fitted. 4. The second dielectric plate is interposed between the feed excitation element and the parasitic excitation element, and the thickness of the second dielectric plate is the feed excitation element and the parasitic element. The antenna device according to any one of claims 1 to 3, wherein the antenna device is large in a region between the excitation elements. 5. A plurality of sets of the feed excitation element and the parasitic excitation element are provided, each of the feed excitation elements is provided on one of the first dielectric plates, and each of the parasitic excitation elements is It is provided on the plurality of second dielectric plates corresponding to the parasitic excitation element, and the legs are arranged between the respective second dielectric plates and the first dielectric plate. Claim 1
The antenna device according to claim 4. 6. A plurality of sets of the feed excitation element and the parasitic excitation element are provided, each of the feed excitation elements is provided on each of the first dielectric plates corresponding to each of the feed excitation elements, The feed excitation element is provided on one of the second dielectric plates, and the legs are respectively arranged between the first dielectric plate and the second dielectric plate. Item 1
The antenna device according to claim 4. 7. A plurality of sets of the feeding excitation element and the parasitic excitation element are provided, each of the feeding excitation element and each of the parasitic excitation elements includes one first dielectric plate and one sheet of the first dielectric plate. The antenna device according to any one of claims 1 to 4, wherein the antenna device is provided on each of the two dielectric plates. 8. The power supply for supplying the power is provided inside the first dielectric plate, and the power supply is electrically connected to the power supply excitation element. The antenna device according to any one of claims 1 to 7.