JP2003298339A - Stacked dielectric antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna with reduced height commonly for utility of two frequency bands and a polarized wave. <P>SOLUTION: The stacked dielectric antenna is provided with a first to a third dielectric layers 11 to 13, a radiation conductor 21 arranged on an upper face of the third dielectric layer 13, a line conductor 41 arranged between the first and the second dielectric layers 11 and 12, a connection conductor 42 to connect one end of the line conductor 41 to the radiation conductor 21, a first ground conductor 31 arranged on a lower face of the first dielectric layer 11, a second ground conductor 32 having a first opening portion arranged between the second and the third dielectric layers, and a third ground conductor 33 having a second opening portion 43 into which the connection conductor 42 penetrates. The radiation conductor 21, the second and the third ground conductors 32 and 33 and the connection conductor 42 constitute a path antenna and the two-cycles dependent and the polarized wave dependent antennas commonly for utility of two frequency bands and the polarized ware are made to be short in height by constituting a slot loop antenna by a loop-shaped slot 51 arranged between the second and the third ground conductors 32 and 33. <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 a dual frequency shared antenna and a polarized wave shared antenna using a laminated dielectric, which are used in, for example, wireless communication devices such as mobile phones and wireless LANs, and various other communication devices. The present invention relates to the laminated dielectric antenna of.

[0002]

2. Description of the Related Art Stacked patch antennas are known as a laminated dielectric antenna as a dual frequency antenna using a laminated dielectric (see, for example, the latest planar antenna technology, General Technology Center, published in 1993). ). Its structure is shown in a perspective perspective view in FIG. 15, a sectional view in FIG. 16, and a perspective plan view in FIG.

In these figures, 111 is a first dielectric layer, 112 is a second dielectric layer laminated on the first dielectric layer 111, and 113 is a second dielectric layer 112. Third stacked on
Dielectric layer, 114 is a fourth dielectric layer laminated on the third dielectric layer 113, and 121 is disposed between the third dielectric layer 113 and the fourth dielectric layer 114. A radiation conductor, 131 is a first ground conductor disposed on the lower surface of the first dielectric layer 111, 132 is disposed between the second and third dielectric layers 112 and 113, and has an opening 143. A second ground conductor, 141 is a line conductor disposed between the first and second dielectric layers 111 and 112, and 142 is disposed through the second and third dielectric layers 112 and 113 and has an opening. A connection conductor that penetrates the portion 143 electrically insulated from the second ground conductor 132 and electrically connects one end of the line conductor 141 and the radiation conductor 121, and 151 is an upper surface of the fourth dielectric layer 114. It is a parasitic element arranged. With such a configuration, the conventional laminated dielectric antenna can be used as a dual frequency antenna by resonating the radiation conductor 121 and the parasitic element 151 at different frequencies.

A stacked patch antenna is known as a laminated dielectric antenna as a dual polarization antenna using a laminated dielectric (for example, Japanese Patent Laid-Open No. 4-40).
See 003 publication). An example of the structure is shown in a perspective view in FIG.

In FIG. 18, 111 is a first dielectric layer, and 112
Is a second dielectric layer laminated on the first dielectric layer 111, 113 is a third dielectric layer laminated on the second dielectric layer 112, and 114 is a third dielectric layer. Fourth stacked on layer 113
, A first radiating conductor 121a is disposed between the third dielectric layer 113 and the fourth dielectric layer 114, and 121b is disposed on the upper surface of the fourth dielectric layer 114. A second radiation conductor, 131 is a first ground conductor disposed on the lower surface of the first dielectric layer 111, 132
Is disposed between the second and third dielectric layers 112 and 113 and has a first opening 143a and a second opening 143b.
, The ground conductor 141 of the first and second dielectric layers 111 and 112.
And a substantially T-shaped line conductor 142a disposed between the first and second dielectric layers 112 and 113. The first opening 143a is electrically connected to the second ground conductor 132. Of the line conductor 141 and the first radiating conductor 1
A first connecting conductor electrically connecting the longitudinal direction of the line conductor 141 and a position displaced in the horizontal direction (indicated by the X direction in the figure) from the center of the 21a, and 142b a second and a third dielectric. The second opening 143b is arranged so as to penetrate through the body layers 112 and 113.
In a direction perpendicular to the longitudinal direction of the line conductor 141 from the other end of the substantially T-shaped line conductor 141 and the center of the second radiation conductor 121b. It is a second connection conductor that electrically connects a position displaced in (indicated by the Y direction in the drawing). In the conventional laminated dielectric antenna,
With such a configuration, the plane of polarization of the radio wave radiated from the first radiation conductor 121a and the plane of polarization of the radio wave radiated from the second radiation conductor 121b are made orthogonal to each other, so that the antenna can be used as a dual polarization antenna. it can.

[0006]

However, in the dual-frequency dual-use antenna using the conventional laminated dielectric antenna as described above, in order to dispose the parasitic element 151, the fourth dielectric is provided on the radiation conductor 121. Since it is necessary to further stack the layer 114, and as a result, the number of dielectric layers increases, there is a problem that the thickness of the entire antenna becomes large.

Also, in the dual polarization antenna using the conventional laminated dielectric antenna as described above, in order to dispose the second radiation conductor 121b, the fourth dielectric layer is formed on the first radiation conductor 121a. Since it is necessary to further stack 114, and as a result, the number of dielectric layers increases, there is a problem that the thickness of the entire antenna increases.

The present invention has been devised in view of the above problems, and an object thereof is a laminated dielectric antenna that can be used as a low-profile dual-frequency shared antenna without having to increase the number of laminated dielectric layers. To provide.

Another object of the present invention is to provide a laminated dielectric antenna that can be used as a low-profile dual-polarization antenna without the need to increase the number of laminated dielectric layers.

[0010]

A first laminated dielectric antenna of the present invention comprises a first dielectric layer and a second dielectric layer laminated on the first dielectric layer. A third dielectric layer laminated on the second dielectric layer, a radiation conductor arranged on the upper surface of the third dielectric layer, and the first and second dielectric layers.
A line conductor arranged between the dielectric layers, and a connection conductor penetrating through the second and third dielectric layers and electrically connecting one end of the line conductor and the radiation conductor. A second ground conductor disposed between the first and second dielectric layers and the first ground conductor disposed on the lower surface of the first dielectric layer and having a substantially rectangular first opening. A substantially rectangular shape having a second opening portion disposed in the first opening portion between the ground conductor and the second and third dielectric layers, the connection conductor being electrically insulated and penetrating therethrough. And a third grounding conductor (3).

A second laminated dielectric antenna according to the present invention includes a first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and the second dielectric layer. A third dielectric layer laminated on the dielectric layer, a radiation conductor arranged on the upper surface of the third dielectric layer, and arranged between the first and second dielectric layers. A line conductor, a connection conductor that penetrates through the second and third dielectric layers and electrically connects one end of the line conductor and the radiation conductor, and a lower surface of the first dielectric layer. And a second ground conductor having a substantially circular first opening, the second ground conductor being disposed between the second ground conductor and the second and third dielectric layers. A third substantially circular-shaped third portion having a second opening that is disposed in the first opening between the three dielectric layers and that penetrates the connection conductor while being electrically insulated. It is characterized in that it comprises a ground conductor.

According to the first and second laminated dielectric antennas of the present invention, the radiation conductor is used as a patch antenna, and the looped slot formed between the second and third ground conductors is a slot loop antenna. Therefore, it is possible to provide a dual frequency antenna by resonating the patch antenna formed by the radiation conductor and the slot loop antenna formed by the loop-shaped slot at different frequencies. Further, since the loop-shaped slot is arranged between the second and third dielectric layers, it is necessary to further laminate the fourth dielectric layer on the radiation conductor as in the example of the conventional laminated dielectric antenna. Since there is no need to increase the number of laminated dielectric layers, it is possible to provide a laminated dielectric antenna that can be used as a low-profile dual-frequency shared antenna.

A third laminated dielectric antenna according to the present invention is the same as the first laminated dielectric antenna according to the present invention.
It is characterized in that the connection conductor is connected to a position displaced from the center of the radiation conductor in a direction orthogonal to the longitudinal direction of the line conductor.

A fourth laminated dielectric antenna of the present invention is the same as the second laminated dielectric antenna of the present invention.
It is characterized in that the connection conductor is connected to a position displaced from the center of the radiation conductor in a direction orthogonal to the longitudinal direction of the line conductor.

According to the third and fourth laminated dielectric antennas of the present invention, the radiation conductor is used as a patch antenna, and between the first opening of the second ground conductor and the third ground conductor. The formed loop-shaped slot can be operated as a slot loop antenna, and since the connection conductor is connected at a position displaced from the center of the radiating conductor in a direction orthogonal to the longitudinal direction of the line conductor, a patch antenna using the radiating conductor is provided. The plane of polarization of the radio wave radiated from the antenna and the plane of polarization of the radio wave radiated from the slot loop antenna formed by the loop-shaped slot can be made orthogonal to each other, whereby a dual polarization antenna can be provided. Further, since the loop-shaped slot is arranged between the second and third dielectric layers, it is necessary to further laminate the fourth dielectric layer on the radiation conductor as in the example of the conventional laminated dielectric antenna. Without
Since it is not necessary to increase the number of laminated dielectric layers, it is possible to provide a laminated dielectric antenna that can be used as a low-profile dual-polarization antenna.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A laminated dielectric antenna of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are perspective views showing an example of an embodiment of a first laminated dielectric antenna of the present invention, respectively.
It is a sectional view and a perspective plan view. In these figures,
11 is a first dielectric layer, 12 is a second dielectric layer laminated on the first dielectric layer 11, and 13 is a third dielectric layer laminated on the second dielectric layer 12. Body layer, 21 is a radiation conductor arranged on the upper surface of the third dielectric layer 13, 31 is a first ground conductor arranged on the lower surface of the first dielectric layer 11, and 32 is a second and a third. Dielectric layer
A second grounding conductor disposed between 12 and 13 and having a substantially rectangular first opening, 33 is a second and third dielectric layer 12.
The third grounding conductor, which is arranged between 13 and has a substantially rectangular shape having the second opening 43, 41 is the first and second dielectric layers 11 and 12.
A line conductor 42 disposed between the second and third dielectric layers 12 and 13 and electrically insulating the second opening 43 from the third ground conductor 33. A connection conductor, which penetrates and electrically connects one end of the line conductor 41 and the radiation conductor 21, 51 is formed between the first opening of the second ground conductor 32 and the third ground conductor 33. It is a substantially square loop-shaped slot.
In this example, the radiation conductor 21 has a substantially rectangular shape that is the same shape as the loop-shaped slot 51.

FIG. 4 is a perspective view similar to FIG. 1 showing an embodiment of the second laminated dielectric antenna of the present invention. 4, the same parts as in FIG. 1 are denoted by the same reference numerals, 11 is a first dielectric layer, 12 is a second dielectric layer laminated on the first dielectric layer 11, Reference numeral 13 is a third dielectric layer laminated on the second dielectric layer 12, 21 is a radiation conductor arranged on the upper surface of the third dielectric layer 13, and 31 is a first dielectric layer 11. The first grounding conductor 32 disposed on the lower surface, 32 is disposed between the second and third dielectric layers 12 and 13, and the second grounding conductor 33 having the substantially circular first opening portion, 33 is A substantially circular third ground conductor disposed between the second and third dielectric layers 12 and 13 and having a second opening 43, 41 is the first and second dielectric layers 11 and 12. And a line conductor 42 disposed between the second and third dielectric layers 12 and 13 and electrically connected to the third ground conductor 33 through the second opening 43. The one end of the connection conductor 41 and the radiation conductor 21 for electrical connection. The connecting conductor 51 is a substantially circular loop-shaped slot formed between the first opening of the second ground conductor 32 and the third ground conductor 33. In this example, the radiating conductor 21 has a looped slot 51.
It has a substantially circular shape similar to that of

According to the first and second laminated dielectric antennas of the present invention thus constructed, the radiation conductor 21 that operates as a patch antenna and the looped slot 51 that operates as a slot loop antenna are separated. By resonating at a frequency, it can be used as a dual frequency antenna. Further, the loop-shaped slot 51 is formed between the first opening of the second ground conductor 32 and the third ground conductor 33 and is arranged between the second and third dielectric layers 12 and 13. Therefore, unlike the example of the conventional laminated dielectric antenna, it is not necessary to further laminate the fourth dielectric layer on the radiating conductor 21, and it is not necessary to increase the number of laminated dielectric layers. It is possible to provide a laminated dielectric antenna that can be used as a dual frequency antenna.

In the example of the first laminated dielectric antenna of the present invention shown in FIGS. 1 to 3, the radiation conductor 21 has a substantially rectangular shape, but it may have a substantially circular shape. Since the radiating conductor 21 also has a function as a wave director for the radio wave radiated from the loop-shaped slot 51, if this is made into a substantially rectangular shape similar to the shape of the loop-shaped slot 51, the radio wave radiated from the loop-shaped slot 51 will be generated. The radiation efficiency of can be improved. Also, when exciting circularly polarized waves,
When the radiating conductor 21 has a substantially circular shape, the axial ratio characteristic of circularly polarized waves can be improved.

In the example of the second laminated dielectric antenna of the present invention shown in FIG. 4, the radiation conductor 21 has a substantially circular shape, but it may have a substantially square shape. Since the radiating conductor 21 also has a function as a director of the radio wave radiated from the loop-shaped slot 51, if this is made substantially circular like the shape of the loop-shaped slot 51, the radio wave from the loop-shaped slot 51 The radiation efficiency can be improved. When exciting circularly polarized waves, the radiation conductor 21 having a substantially circular shape can improve the axial ratio characteristic as circularly polarized waves. Further, when the outer shape of the entire laminated dielectric antenna is a substantially rectangular parallelepiped, if the radiating conductor 21 has a substantially quadrangular shape along the shape, the surface area becomes larger than that in the case of having a substantially circular shape, so that the frequency band can be widened. You can

Further, FIGS. 5 to 7 show the third embodiment of the present invention.
1 to 3 showing an example of an embodiment of the laminated dielectric antenna of FIG.
FIG. 4 is a perspective view, a sectional view and a perspective plan view similar to FIG. 3. 1 to 3 are denoted by the same reference numerals, 11 is a first dielectric layer, and 12 is a second dielectric layer laminated on the first dielectric layer 11. Dielectric layer, 13 is second
A third dielectric layer laminated on the dielectric layer 12, a radiation conductor 21 is disposed on the upper surface of the third dielectric layer 13, and a radiation conductor 31 is disposed on the lower surface of the first dielectric layer 11. First ground conductor, 32 is second
And a second ground conductor disposed between the third and third dielectric layers 12 and 13 and having a substantially rectangular first opening, and 33 between the second and third dielectric layers 12 and 13. Arranged, the second opening 43
And a line conductor arranged between the first and second dielectric layers 11 and 12, and a second and third dielectric layers 12 and 13, respectively. It is arranged through and the second
Through the opening 43 of the line conductor 41 electrically insulated from the third ground conductor 33, and from the center of the end of the line conductor 41 and the center of the radiating conductor 21 in the longitudinal direction of the line conductor 41 (shown in the X direction in the figure). A connection conductor for electrically connecting a position displaced in the orthogonal direction (indicated by the Y direction in the same figure), 51 denotes a first opening of the second ground conductor 32 and a third ground conductor 33. It is a substantially square loop-shaped slot formed between them. In this example, the radiation conductor 21 has a substantially rectangular shape that is the same shape as the loop-shaped slot 51.

FIG. 8 is a perspective view similar to FIG. 5, showing an example of an embodiment of the fourth laminated dielectric antenna of the present invention. 8, the same parts as those in FIG. 5 are denoted by the same reference numerals, 11 is a first dielectric layer, 12 is a second dielectric layer laminated on the first dielectric layer 11, Reference numeral 13 is a third dielectric layer laminated on the second dielectric layer 12, 21 is a radiation conductor arranged on the upper surface of the third dielectric layer 13, and 31 is a first dielectric layer 11. The first grounding conductor 32 disposed on the lower surface, 32 is disposed between the second and third dielectric layers 12 and 13, and the second grounding conductor 33 having the substantially circular first opening portion, 33 is A substantially circular third ground conductor disposed between the second and third dielectric layers 12 and 13 and having a second opening 43, 41 is the first and second dielectric layers 11 and 12. A line conductor 42 disposed between the second and third dielectric layers 12 and 13 and a second opening 43.
Through a third ground conductor 33 that is electrically insulated from the third ground conductor 33, and is orthogonal to the longitudinal direction of the line conductor 41 (shown as the X direction in the figure) from one end of the line conductor 41 and the center of the radiation conductor 21. A connecting conductor for electrically connecting the position shifted in the Y direction in the figure), 51 is the first opening of the second ground conductor 32 and the third
Is a substantially circular loop-shaped slot formed between the ground conductor 33 and the ground conductor 33. In this example, the radiation conductor 21 has a substantially circular shape that is the same as the loop-shaped slot 51.

According to the third and fourth laminated dielectric antennas of the present invention configured as described above, the radiation conductor 21 is used as a patch antenna, and the first opening of the second ground conductor 32 and the first opening are provided. The loop-shaped slot 51 formed between the third conductor 3 and the ground conductor 33 can be operated as a slot loop antenna, and the connection conductor 42 is displaced from the center of the radiating conductor 21 in the direction orthogonal to the longitudinal direction of the line conductor 41. Since it is connected to the position where it is connected, the plane of polarization of the radio wave radiated from the patch antenna by the radiation conductor 21 and the plane of polarization of the radio wave radiated from the slot loop antenna by the loop-shaped slot 51 can be made orthogonal to each other. A shared antenna can be provided. Further, since the loop-shaped slot 51 is arranged between the second and third dielectric layers 12 and 13,
Unlike the conventional laminated dielectric antenna, it is not necessary to further laminate the fourth dielectric layer on the radiating conductor 21, and it is not necessary to increase the number of laminated dielectric layers. It is possible to provide a laminated dielectric antenna that can be used.

In the example of the third laminated dielectric antenna of the present invention shown in FIGS. 5 to 7, the radiation conductor 21 has a substantially quadrangular shape, but it may have a substantially circular shape. Since the radiating conductor 21 also has a function as a wave director for the radio wave radiated from the loop-shaped slot 51, if this is made into a substantially rectangular shape similar to the shape of the loop-shaped slot 51, the radio wave radiated from the loop-shaped slot 51 will be generated. The radiation efficiency of can be improved. Further, if the radiation conductor 21 has a substantially circular shape, cross polarization can be reduced.

In the example of the fourth laminated dielectric antenna of the present invention shown in FIG. 8, the radiation conductor 21 has a substantially circular shape, but it may have a substantially square shape. Since the radiating conductor 21 also has a function as a director of the radio wave radiated from the loop-shaped slot 51, if this is made substantially circular like the shape of the loop-shaped slot 51, the radio wave from the loop-shaped slot 51 The radiation efficiency can be improved. Further, if the radiation conductor 21 has a substantially circular shape, cross polarization can be reduced. Further, when the outer shape of the entire laminated dielectric antenna is a substantially rectangular parallelepiped, if the radiating conductor 21 has a substantially quadrangular shape along the shape, the surface area becomes larger than that in the case of having a substantially circular shape, so that the frequency band can be widened. You can

In the laminated dielectric antenna of the present invention, the first to third dielectric layers 11 to 13, the radiation conductor 21, the first to third ground conductors 31 to 33, the line conductor 41, and the connection conductor 42 are It is possible to use various materials and forms similar to those used for well-known high-frequency wiring boards.

The first to third dielectric layers 11 to 13 are, for example, ceramic materials such as alumina ceramics and mullite ceramics, inorganic materials such as glass ceramics, or tetrafluoroethylene-ethylene resin (polytetrafluoroethylene). PTFE) / tetrafluoroethylene-ethylene copolymer resin (tetrafluoroethylene-ethylene copolymer resin; ETFE) / tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin) A resin material such as a fluororesin such as PFA), a glass epoxy resin, or a polyimide is used. The shapes and dimensions (thickness, width, length) of the first to third dielectric layers 11 to 13 made of these materials are set according to the frequency to be used, the application, and the like.

Radiation conductor 21, first to third ground conductors 31 to 33
The line conductor 41 and the connecting conductor 42 are conductor layers made of a metal material for high-frequency signal transmission, for example, Cu layers, Mo-Mn metallized layers with Ni plating layer and Au plating layer deposited on them, and W metallizations. Ni-plated layer and Au-plated layer deposited on the layer, Cr-Cu alloy layer, Cr-Cu
An alloy layer with a Ni plating layer and an Au plating layer deposited on it. A Ta ₂ N layer with a Ni—Cr alloy layer and an Au plating layer deposited on it. A Pt layer and Au layer on a Ti layer.
Formed by a thick film printing method or various thin film forming methods, plating methods, etc. using a material having a plated layer deposited, or a material having a Pt layer and an Au plated layer deposited on a Ni—Cr alloy layer. To be done. The thickness, width, etc. are also set according to the frequency of the high-frequency signal to be transmitted, the application, etc.

As a method of manufacturing the laminated dielectric antenna of the present invention, for example, when the first to third dielectric layers 11 to 13 are made of glass ceramics, the first to third dielectric layers 11 are first prepared. Glass ceramics green sheets of 13 to 13 are prepared, a predetermined punching process is performed on the green sheets to form through holes to be through conductors as the connection conductors 42, and then a conductor paste such as Cu is penetrated by a screen printing method. A predetermined transmission line pattern and other radiating conductors 21 and first to third ground conductors that fill the
A conductor layer pattern to be 31 to 33 is printed and applied. next,
Firing is performed at 850 to 1000 ° C., and finally the surfaces of the conductors and conductor layers are plated with Ni and Au.

Next, FIG. 9 is a diagram showing the reflection characteristics of an example of an embodiment of the first laminated dielectric antenna of the present invention shown in FIGS. In FIG. 9, the horizontal axis represents frequency (unit: GHz), the vertical axis represents reflection loss (unit: dB), and the characteristic curve represents the reflection characteristic, that is, the frequency characteristic of the reflection loss. The reflection characteristics shown in this diagram are obtained by using an electromagnetic field simulation.

In the first laminated dielectric antenna of the present invention having this reflection characteristic, referring to the dimensions shown in FIGS. 2 and 3, the thickness of the first dielectric layer 11: H11 is 0.5 m.
m, thickness of the second dielectric layer 12: H12 is 0.5 mm, thickness of the third dielectric layer 13: H13 is 1 mm, length of one side of the substantially radiating conductor 21: L21 is 10 mm, line conductor The length of 41 that protrudes from the center line of the radiation conductor 21 and the loop-shaped slot 51: L41 is 1.4 mm, the width of the line conductor 41: W41 is 0.2 mm,
The diameter of the connecting conductor 42 is 0.2 mm, the diameter of the second opening 43 is 1 mm, the length of the side of the loop-shaped slot 51: L51 is 10 m.
m, the width of the loop-shaped slot 51: W51 was 0.5 mm.
The relative permittivity of each of the dielectric layers 11 to 13 was set to 9.6.

In the reflection characteristics shown in FIG. 9, 3.94 GH
It can be seen that at z, the looped slot 51 operates as a slot loop antenna and causes resonance, and at 4.72 GHz, the radiation conductor 21 operates as a patch antenna and causes resonance.

When the reflection characteristics of the second laminated dielectric antenna of the present invention shown in FIG. 4 were obtained in the same manner, the looped slot 51 acted as a slot loop antenna and the radiation conductor was obtained as in this example. It was confirmed that 21 operates as a patch antenna and resonates.

On the other hand, FIG. 10 shows a structure of a patch antenna using the radiation conductor 21 by removing the connecting conductor 42 from the example of the embodiment of the first laminated dielectric antenna of the present invention shown in FIGS. 1 to 3. And the reflection characteristics of the antenna in which only the structure of the slot loop antenna with the looped slot 51 is left, and FIG. 11 and FIG.
The reflection characteristics of the antenna in which the loop-shaped slots 51 are removed from the example of the embodiment of the laminated dielectric antenna described above to eliminate the structure of the slot loop antenna and only the structure of the patch antenna by the radiation conductor 21 is left are shown. The dimensions, materials, and simulator used at this time were the same as those used to obtain the results shown in FIG.

10 and 11, the horizontal axis is frequency (unit: GHz), the vertical axis is reflection loss (unit: dB), and the characteristic curve shows the frequency characteristic of reflection loss, as in FIG. ing. As shown in FIG. 10, this slot loop antenna resonates at 4 GHz, and is 3.94 GHz in FIG.
It can be seen that this corresponds to the resonance frequency of z. Also, the figure
As shown in 11, it can be seen that this patch antenna resonates at 4.72 GHz and corresponds to the resonance frequency of 4.72 GHz in FIG. That is, 3.94 GHz in FIG. 9 is a slot loop antenna with a looped slot 51, 4.72 GHz.
It can be seen that Hz is due to the resonance of the patch antenna by the radiation conductor 21.

Further, FIG. 19 is a diagram similar to FIG. 9 showing the reflection characteristics of the stacked patch antenna which is a dual frequency shared antenna using the conventional laminated dielectric antenna shown in FIGS. Also in FIG. 19, the horizontal axis represents frequency (unit: GH
z), the vertical axis is the reflection loss (unit: dB), and the characteristic curve shows the frequency characteristic of the reflection loss. This diagram was obtained using the same electromagnetic field simulation used to obtain the results shown in FIG.

In the conventional laminated dielectric antenna having this reflection characteristic, referring to the dimensions shown in FIGS. 16 and 17, the thickness of the first dielectric layer 111: H111 is 0.5 mm, and the second dielectric layer 111 is 0.5 mm.
The thickness of the dielectric layer 112: H112 is 0.5 mm, the thickness of the third dielectric layer 113: H113 is 1 mm, the thickness of the fourth dielectric layer 114: H114 is 0.5 mm, and the substantially rectangular radiation conductor 121 is Length of one side: L121 is 10 mm, length of line conductor 141 protruding from middle line of radiation conductor 121: L141 is 1.4 mm, line conductor 141
Width: W141 0.2 mm, connection conductor 142 diameter 0.2 mm,
A substantially rectangular parasitic element 151 having a diameter of the opening 143 of 1 mm.
The length of one side: L151 was 12 mm. The relative permittivity of each of the dielectric layers 111 to 114 was set to 9.6.

From the results shown in FIG. 19, it can be seen that similar to the results shown in FIG. 9, the dual frequency characteristics are obtained. It should be noted that this conventional laminated dielectric antenna is different from the first laminated dielectric antenna of the present invention in which the results shown in FIG. 9 are obtained, in that the second ground conductor 132 does not have a loop-shaped slot. The conditions are the same except that the fourth dielectric layer 114 is arranged and the parasitic element 151 is arranged. Therefore, regarding the thickness of the antenna, while the thickness of the first laminated dielectric antenna of the present invention, which obtained the result of FIG. 9, is 2 mm, the conventional laminated dielectric used to obtain the result of FIG. The thickness of the body antenna is 2.5 mm
Therefore, the laminated dielectric antenna of the present invention has a lower profile. That is, according to the laminated dielectric antenna of the present invention shown in FIGS. 1 to 3, it is possible to increase the number of dielectric layers as in the dual frequency antenna using the conventional laminated dielectric antenna shown in FIGS. It is possible to obtain the dual frequency characteristic without using the two frequencies.

Next, FIG. 12 is a diagram showing the reflection characteristics of an example of an embodiment of the third laminated dielectric antenna of the present invention shown in FIGS. In FIG. 12, the horizontal axis represents frequency (unit: GHz), the vertical axis represents reflection loss (unit: dB), and the characteristic curve represents the reflection characteristic, that is, the frequency characteristic of the reflection loss. The reflection characteristics shown in this diagram are obtained by using an electromagnetic field simulation.

13 and 14 are diagrams showing the radiation characteristics at 4.06 GHz and 4.68 GHz where resonance occurs in the reflection characteristics shown in FIG. 12, respectively. Figure
In FIG. 13 and FIG. 14, the numbers on the outer circumference of the circle are the angles (unit: °) indicating the azimuth with the vertex direction (shown in the Z direction in FIGS. 5 to 7) as 0 °, and the vertical axis is the gain (unit: dBi). And the characteristic curve shows the radiation characteristic, that is, the azimuth characteristic of gain. The radiation characteristics shown in these diagrams are also obtained by using the electromagnetic field simulation.

In the radiation characteristic shown in FIG. 13, it can be seen that the XZ plane polarization is the main polarization and the YZ plane polarization is the cross polarization. Therefore, in the reflection characteristics shown in FIG. 12, at 4.06 GHz, the loop-shaped slot 51 operates as a slot loop antenna to cause resonance, and X-Z
Radio waves with plane polarization as the main polarization are radiated.

Similarly, in the radiation characteristic shown in FIG.
It can be seen that the YZ plane polarization is the main polarization and the XZ plane polarization is the cross polarization. Therefore, in the reflection characteristic shown in FIG. 12, at 4.68 GHz, the radiation conductor 21 operates as a patch antenna to cause resonance, and a radio wave whose main polarization is the YZ plane polarization is radiated.

As described above, according to the third laminated dielectric antenna of the present invention, the plane of polarization of the radio wave radiated from the patch antenna by the radiation conductor 21 and the polarization of the radio wave radiated from the slot loop antenna by the loop-shaped slot 51. It can be seen that the wavefronts are orthogonal and operate as a dual polarization antenna.

When the reflection characteristics and the radiation characteristics of the fourth laminated dielectric antenna of the present invention shown in FIG. 8 were obtained in the same manner, the radio wave radiated from the patch antenna by the radiation conductor 21 was obtained as in this example. It was confirmed that the polarization plane of and the polarization plane of the radio wave radiated from the slot loop antenna due to the loop-shaped slot 51 were orthogonal to each other and that the antenna operates as a dual polarization antenna.

In the third laminated dielectric antenna of the present invention having the reflection characteristic and the radiation characteristic shown in FIGS. 12 to 14,
Referring to the dimensions shown in FIGS. 6 and 7, the thickness of the first dielectric layer 11: H11 is 0.5 mm, the thickness of the second dielectric layer 12: H12 is 0.5 mm, and the thickness of the third dielectric layer 13 is 0.5 mm. Thickness: H13 is 1 mm, length of one side of the substantially rectangular radiation conductor 21: L21
10 mm, Y from the center of the radiating conductor 21 at the center of the connecting conductor 42
Amount of deviation in the direction: L41 is 1.4 mm, width of the line conductor 41: W4
1 is 0.2 mm, the diameter of the connecting conductor 42 is 0.2 mm, the diameter of the second opening 43 is 1 mm, and the side length of the loop-shaped slot 51 is:
L51 is 10 mm, width of loop-shaped slot 51: W51 is 1.5 m
m. The relative permittivity of each of the dielectric layers 11 to 13 was set to 9.6.

20 is a diagram similar to FIG. 12 showing the reflection characteristics of a stacked patch antenna which is a dual polarization antenna using the conventional laminated dielectric antenna shown in FIG.
Also in FIG. 20, the horizontal axis represents frequency (unit: GHz), the vertical axis represents reflection loss (unit: dB), and the characteristic curve represents the reflection characteristic, that is, the frequency characteristic of the reflection loss. The reflection characteristics shown in this diagram are also obtained by using electromagnetic field simulation.

21 and 22 show radiation characteristics at 4.42 GHz and 5.08 GHz where resonance occurs in the reflection characteristics shown in FIG. 20, respectively.
It is a diagram similar to FIG. Also in FIGS. 21 and 22, the numbers on the outer circumference of the circle are the angles (unit: °) indicating the azimuth with the vertex direction (indicated by the Z direction in FIG. 18) being 0 °, and the vertical axis is the gain (unit:
dBi), and the characteristic curve shows the radiation characteristic, that is, the azimuth characteristic of the gain. The radiation characteristic shown in this diagram is also obtained by using the electromagnetic field simulation.

In the radiation characteristic shown in FIG. 21, it can be seen that the XZ plane polarization is the main polarization and the YZ plane polarization is the cross polarization. Therefore, in the reflection characteristic shown in FIG. 20, the first radiation conductor 121a resonates at X at 4.42 GHz.
It can be said that a radio wave whose main polarization is −Z plane polarization is radiated.

Similarly, in the radiation characteristic shown in FIG.
It can be seen that the YZ plane polarization is the main polarization and the XZ plane polarization is the cross polarization. Therefore, in the reflection characteristics shown in FIG. 20, it can be said that at 5.08 GHz, the second radiation conductor 121b resonates and a radio wave having the YZ plane polarization as the main polarization is radiated.

As described above, also in this conventional laminated dielectric antenna, the plane of polarization of the radio wave emitted from the first radiation conductor 121a and the plane of polarization of the radio wave emitted from the second radiation conductor 121b are orthogonal to each other. , It can be seen that it operates as a dual polarization antenna.

In the conventional laminated dielectric antenna having the reflection characteristics and the radiation characteristics shown in FIGS. 20 to 22, the first dielectric layer 111 has a thickness of 0.5 mm and the second dielectric layer 112 has a thickness of 0.5 mm. 0.5 mm, the thickness of the third dielectric layer 113 is 1 mm, the thickness of the fourth dielectric layer 114 is 0.5 mm, and the lengths of one sides of the substantially quadrangular first and second radiation conductors 121a and 121b are respectively. Ten
mm, 9 mm, the deviation amount of the center of the first connecting conductor 142a in the X direction from the center of the first radiating conductor 121a is 1.4 mm, the center of the second radiating conductor 121b is the center of the second connecting conductor 142b. Deviation from the Y direction to 1.4 mm, the width of the line conductor 141
0.2 mm, the diameter of the first and second connection conductors 142a and 142b was 0.2 mm, and the diameter of the first and second openings 143a and 143b was 1 mm. The relative permittivity of each of the dielectric layers 11 to 14 was 9.6.

Incidentally, this conventional laminated dielectric antenna is
Compared to the third laminated dielectric antenna of the present invention which has obtained the results shown in FIGS. 12 to 13, the second ground conductor 132 has no looped slot, and the fourth dielectric layer is arranged. Are provided, the second radiation conductor 121b is provided, the line conductor 141 is substantially T-shaped, the second connection conductor 142b is provided, and the second opening 143b is provided. All are the same except that they are arranged. Therefore, regarding the thickness of the antenna, while the thickness of the third laminated dielectric antenna of the present invention which obtained the results of FIGS. 12 to 14 is 2 mm, the results of FIGS. The thickness of the conventional laminated dielectric antenna used was 2.5 mm, and the third laminated dielectric antenna of the present invention was lower in height. That is, according to the third laminated dielectric antenna of the present invention shown in FIGS. 5 to 7, it is possible to increase the number of dielectric layers as in the dual polarization antenna using the conventional laminated dielectric antenna shown in FIG. Polarization sharing characteristics can be obtained without using.

The present invention is not limited to the examples of the above embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in the first and second laminated dielectric antennas of the present invention, the radiation conductor 21,
The loop-shaped slot 51 may be provided with a perturbation element for exciting a circularly polarized wave. Further, in the third and fourth laminated dielectric antennas of the present invention, the center of the line conductor 41 is made to coincide with the center of the loop-shaped slot 51, and one end of the line conductor 41 connected to the connecting conductor 42 is curved or bent to make one end. Radiating conductor
The structure may be such that the line conductor 41 is displaced from the center in a direction orthogonal to the longitudinal direction of the line conductor 41, and one end thereof is connected to the connection conductor 42.

[0055]

According to the first and second laminated dielectric antennas of the present invention, the first dielectric layer and the second dielectric layer laminated on the first dielectric layer are provided. A third dielectric layer laminated on the second dielectric layer, a radiation conductor arranged on an upper surface of the third dielectric layer, and the first and second dielectric layers. A line conductor disposed between the line conductor, a connection conductor that penetrates through the second and third dielectric layers, and electrically connects one end of the line conductor to the radiation conductor; and the first conductor. A first ground conductor disposed on the lower surface of the dielectric layer,
Between a second ground conductor having a substantially rectangular or substantially circular first opening, which is arranged between the second and third dielectric layers, and between the second and third dielectric layers. And a third grounding conductor having a substantially rectangular shape or a substantially circular shape, which is disposed in the first opening and has a second opening through which the connecting conductor is electrically insulated and penetrates, Since the radiation conductor can be operated as a patch antenna and the loop-shaped slot formed between the second and third ground conductors can be operated as a slot loop antenna, the radiation conductor operating as a patch antenna and the slot loop antenna can be operated. It can be used as a dual-frequency antenna by resonating the loop-shaped slot that operates as the above at different frequencies. Further, since the loop-shaped slot is arranged between the second and third dielectric layers, a fourth dielectric layer is further provided on the radiation conductor like a stacked patch antenna using a conventional laminated dielectric antenna. Since it is not necessary to stack the layers and it is not necessary to increase the number of layers of the dielectric layers, it is possible to provide a laminated dielectric antenna that can be used as a low-profile dual-frequency antenna.

According to the third and fourth laminated dielectric antennas of the present invention, the first dielectric layer and the second dielectric layer laminated on the first dielectric layer are provided. A third dielectric layer laminated on the second dielectric layer, and the third dielectric layer
The radiation conductor disposed on the upper surface of the dielectric layer, the line conductor disposed between the first and second dielectric layers, and the second conductor.
And a connection conductor that is arranged to penetrate through the third dielectric layer and electrically connects one end of the line conductor and a position displaced from the center of the radiation conductor in a direction orthogonal to the longitudinal direction of the line conductor. A first dielectric layer disposed on the lower surface of the first dielectric layer
Second ground conductor disposed between the second ground conductor and the second and third dielectric layers and having a first opening of a substantially square shape or a substantially circular shape, and the second and third ground conductors. A substantially quadrangular or substantially circular third ground conductor which is arranged in the first opening between the dielectric layers and has a second opening through which the connecting conductor is electrically insulated and penetrates; Therefore, the radiation conductor can be operated as a patch antenna, and the loop-shaped slot formed between the first opening of the second ground conductor and the third ground conductor can be operated as a slot loop antenna. At the same time, the plane of polarization of the radio waves radiated from the patch antenna by the radiating conductor and the plane of polarization of the radio waves radiated from the slot loop antenna by the loop-shaped slot can be made orthogonal to each other. It can be. Further, since the loop-shaped slot is arranged between the second and third dielectric layers, it is necessary to further laminate the fourth dielectric layer on the radiation conductor as in the example of the conventional laminated dielectric antenna. Since there is no need to increase the number of laminated dielectric layers, it is possible to provide a laminated dielectric antenna that can be used as a low-profile dual-polarization antenna.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a first laminated dielectric antenna of the present invention.

FIG. 2 is a sectional view showing an example of an embodiment of a first laminated dielectric antenna of the present invention.

FIG. 3 is a perspective plan view showing an example of an embodiment of a first laminated dielectric antenna of the present invention.

FIG. 4 is a perspective view showing an example of an embodiment of a second laminated dielectric antenna of the present invention.

FIG. 5 is a perspective view showing an example of an embodiment of a third laminated dielectric antenna of the present invention.

FIG. 6 is a sectional view showing an example of an embodiment of a third laminated dielectric antenna of the present invention.

FIG. 7 is a perspective plan view showing an example of an embodiment of a third laminated dielectric antenna of the present invention.

FIG. 8 is a perspective view showing an example of an embodiment of a fourth laminated dielectric antenna of the present invention.

FIG. 9 is a diagram showing an example of reflection characteristics of the first laminated dielectric antenna of the present invention.

FIG. 10 is a diagram showing an example of reflection characteristics of an antenna obtained by partially modifying the first laminated dielectric antenna of the present invention.

FIG. 11 is a diagram showing an example of reflection characteristics of an antenna obtained by partially modifying the first laminated dielectric antenna of the present invention.

FIG. 12 is a diagram showing an example of reflection characteristics of the third laminated dielectric antenna of the present invention.

FIG. 13 is a diagram showing an example of radiation characteristics of the third laminated dielectric antenna of the present invention.

FIG. 14 is a diagram showing an example of radiation characteristics of a third laminated dielectric antenna of the present invention.

FIG. 15 is a perspective view showing an example of a dual frequency dual-use antenna using a conventional laminated dielectric antenna.

FIG. 16 is a cross-sectional view showing an example of a dual-frequency shared antenna using a conventional laminated dielectric antenna.

FIG. 17 is a perspective plan view showing an example of a dual-frequency shared antenna using a conventional laminated dielectric antenna.

FIG. 18 is a perspective view showing an example of a dual-polarization antenna using a conventional laminated dielectric antenna.

FIG. 19 is a diagram showing an example of reflection characteristics of a dual-frequency shared antenna using a conventional laminated dielectric antenna.

FIG. 20 is a diagram showing an example of reflection characteristics of a dual polarization antenna using a conventional laminated dielectric antenna.

FIG. 21 is a diagram showing an example of radiation characteristics of a dual-polarization antenna using a conventional laminated dielectric antenna.

FIG. 22 is a diagram showing an example of radiation characteristics of a dual-polarization antenna using a conventional laminated dielectric antenna.

[Explanation of symbols]

11 ... First dielectric layer 12 ... second dielectric layer 13 ... Third dielectric layer 21 ... Radiation conductor 31 ... First ground conductor 32 ... Second ground conductor 33 ... Third ground conductor 41 ... Line conductor 42 ... Connecting conductor 43 ... second opening 51 ・ ・ ・ Loop slot

Claims (4)

[Claims] 1. A first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and a third dielectric layer laminated on the second dielectric layer. A dielectric layer, a radiation conductor arranged on an upper surface of the third dielectric layer, a line conductor arranged between the first and second dielectric layers, and the second and third dielectric layers. A connection conductor which is arranged to penetrate through the body layer and electrically connects one end of the line conductor to the radiation conductor; a first ground conductor arranged on the lower surface of the first dielectric layer; Second
And a substantially quadrangular first layer disposed between the third dielectric layer and the third dielectric layer.
A second ground conductor having an opening and a second ground conductor disposed in the first opening between the second and third dielectric layers, the connecting conductor being electrically insulated and penetrating therethrough. A laminated dielectric antenna, comprising: a substantially rectangular third ground conductor having an opening. 2. A first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and a third dielectric layer laminated on the second dielectric layer. A dielectric layer, a radiation conductor arranged on an upper surface of the third dielectric layer, a line conductor arranged between the first and second dielectric layers, and the second and third dielectric layers. A connection conductor which is arranged to penetrate through the body layer and electrically connects one end of the line conductor to the radiation conductor; a first ground conductor arranged on the lower surface of the first dielectric layer; Second
And a second ground conductor that is disposed between the third dielectric layer and has a substantially circular first opening, and the second and third ground conductors.
A substantially circular third grounding conductor disposed in the first opening between the dielectric layers and having a second opening through which the connecting conductor is electrically insulated. And a laminated dielectric antenna. 3. The laminated dielectric antenna according to claim 1, wherein the connection conductor is connected to a position displaced from the center of the radiation conductor in a direction orthogonal to the longitudinal direction of the line conductor. 4. The laminated dielectric antenna according to claim 2, wherein the connection conductor is connected to a position displaced from the center of the radiation conductor in a direction orthogonal to the longitudinal direction of the line conductor.