JP2003273640A - Laminated dielectric antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the height of a polarized wave sharing antenna using a laminated dielectric. <P>SOLUTION: The laminated dielectric antenna is provided with first and second dielectric layers 11 and 12, a radiation conductor 21 arranged on the upper face of the second dielectric layer 12, a line conductor 41 arranged between the first and second dielectric layers 11 and 12, a connection conductor 42 arranged through the second dielectric layer 12 for electrically connecting one terminal of the line conductor 41 and a position deviated from the center of the radiation conductor 21 orthogonally to the lengthwise direction of the line conductor 41, and a ground conductor 31 arranged on the lower face of the first dielectric layer 11. By arranging the line conductor 41 between the first and second dielectric layers 11 and 12, the height of the polarized wave sharing antenna can be reduced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual polarization antenna using a laminated dielectric used in, for example, wireless communication devices such as mobile phones and wireless LANs, and various other communication devices.

[0002]

2. Description of the Related Art For example, a polarization polarization patch antenna is known as a polarization polarization antenna using a conventional laminated dielectric used in a wireless communication device such as a mobile phone and a wireless LAN, and various other communication devices. (See, for example, Illustrated / Antenna, IEICE, 1995). An example of the structure is shown in FIG. 6 in a perspective perspective view and in FIG. 7 in a perspective plan view. In these figures, 111 is a first dielectric layer, 112 is a second dielectric layer laminated on the first dielectric layer 111, and 121 is a top surface of the second dielectric layer 112. A radiation conductor, 141 a line conductor having a substantially L-shape arranged on the lower surface of the first dielectric layer 111, 142a arranged so as to penetrate the first and second dielectric layers 111 and 112, A first connecting conductor electrically connecting 141 and a point displaced from the center of the radiating conductor 121 in the longitudinal direction of the line conductor 141 (shown in the X direction in FIGS. 6 and 7), and 142b denotes the first and second connecting conductors. 2 dielectric layers 1
Positions that are arranged so as to pass through 11.112 and that are displaced from one end of the line conductor 141 and the center of the radiating conductor 121 in the direction orthogonal to the longitudinal direction of the line conductor 141 (shown as the Y direction in FIGS. 6 and 7). A second connecting conductor for electrically connecting to each other, 131 is a grounding conductor disposed between the first and second dielectric layers 111 and 112, 143
a is a grounding conductor 131, a first opening for electrically insulating the first connecting conductor 142a and the grounding conductor 131, and 143b is a grounding conductor 131, and a second connecting conductor 142b and a grounding conductor. 13
The second opening electrically insulates the first opening from the first opening. Note that the illustration of the first and second dielectric layers 111 and 112 is omitted in FIG. 7.

In the conventional laminated dielectric antenna, by connecting the first connection conductor 142a at a position displaced from the center of the radiation conductor 121 in the X direction, a resonance current in the X direction is generated on the radiation conductor 121, and X A radio wave having the −Z plane as a plane of polarization is radiated, and the second connection conductor 142b is connected to a position displaced from the center of the radiation conductor 121 in the Y direction, whereby a resonance current in the Y direction on the radiation conductor 121. Occurs, and a radio wave having a plane of polarization in the YZ plane is supplied and radiated, whereby the antenna can be used as a dual polarization antenna.

At this time, the portion below the ground conductor 131 functions as a power supply circuit, and high-frequency current is supplied from one end of the line conductor 141, and the first and second connection conductors 142a.1 are connected.
A high frequency current is supplied to the radiation conductor 121 by 42b,
The thickness of the first dielectric layer 111 on which the connection conductor 141 is arranged on the lower surface does not contribute to the characteristics of the antenna. Meanwhile, the ground conductor
The portion above 131 functions as an antenna, and high-frequency current is fed to the radiation conductor 121 from the first and second connection conductors 142a and 142b as described above, but the radiation conductor 121 is arranged on the upper surface. The thickness of the second dielectric layer 112 is
It greatly affects the antenna characteristics such as gain.

[0005]

However, in such a conventional dual-polarization antenna using a laminated dielectric, since the line conductor 141 is arranged below the ground conductor 131, the line below the ground conductor 131 is used. Since it is necessary to provide the first dielectric layer 111 for arranging the conductor 141, which is not necessarily required from the viewpoint of antenna characteristics, there is a problem that the thickness of the entire antenna is increased. .

The present invention has been devised in view of the above problems, and an object thereof is to provide a laminated dielectric antenna that can be used as a low-profile dual-polarization antenna.

[0007]

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. The substantially rectangular radiation conductor disposed on the upper surface of the second dielectric layer;
And a substantially L-shaped line conductor whose longitudinal direction is arranged parallel to one side of the radiation conductor at a position facing the radiation conductor between the second dielectric layer and the second dielectric layer. A connection conductor, which is disposed so as to penetrate therethrough 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, and the first dielectric layer. And a ground conductor disposed on the lower surface of the.

A second laminated dielectric antenna according to the present invention has a first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and the second dielectric layer. A substantially circular radiation conductor arranged on the upper surface of the dielectric layer, and a substantially L-shaped line conductor arranged at a position facing the radiation conductor between the first and second dielectric layers, A connection conductor that is disposed so as to penetrate through the second 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. And a ground conductor disposed on the lower surface of the first dielectric layer.

According to the first and second laminated dielectric antennas of the present invention, a resonant current in the longitudinal direction of the line conductor is generated on the radiating conductor due to electromagnetic coupling between the longitudinal portion of the line conductor and the radiating conductor. Radio waves with a plane of polarization parallel to the longitudinal direction of the radiating conductor are radiated, and by connecting one end of the connecting conductor to a position displaced from the center of the radiating conductor in the direction orthogonal to the longitudinal direction of the line conductor, A resonance current in a direction orthogonal to the longitudinal direction of the line conductor is generated in the antenna, and a radio wave having a plane of polarization as a plane orthogonal to the longitudinal direction of the line conductor is radiated, whereby the antenna can operate as a dual polarization antenna. Further, since the line conductor is arranged between the first and second dielectric layers, a dielectric which is not necessarily required from the viewpoint of antenna characteristics under the ground conductor as in the case of the conventional laminated dielectric antenna. Since it is not necessary to arrange layers, it is possible to provide a laminated dielectric antenna that can be used as a low-profile dual-polarization antenna.

[0010]

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

FIG. 1 and FIG. 2 respectively show a first embodiment of the present invention.
FIG. 3 is a perspective view and a perspective plan view showing an example of an embodiment of the laminated dielectric antenna of FIG. In these figures, 11
Is a first dielectric layer, 12 is a second dielectric layer laminated on the first dielectric layer 11, and 21 is a substantially rectangular radiation disposed on the upper surface of the second dielectric layer 12. A conductor, 41 is located between the first and second dielectric layers 11 and 12 at a position facing the radiation conductor 21, and the longitudinal direction (indicated by the X direction in FIGS. 1 and 2) is the radiation conductor 21.
A substantially L-shaped line conductor that is arranged parallel to one side and has one end bent in a direction orthogonal to it (indicated by the Y direction in FIGS. 1 and 2), and 42 penetrates the second dielectric layer 12. One end of the line conductor 41 (the tip bent into a substantially L shape)
And a connecting conductor for electrically connecting a position displaced from the center of the radiating conductor 21 in a direction orthogonal to the longitudinal direction of the line conductor 41 (shown in the Y direction in FIGS. 1 and 2), 31 is a first dielectric A ground conductor arranged on the lower surface of the body layer 11. Note that the illustration of the first and second dielectric layers 11 and 12 is omitted in FIG.

FIG. 3 is a perspective view similar to FIG. 1, showing an example of an embodiment of the second laminated dielectric antenna of the present invention. In FIG. 3, the same parts as those 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 21 denotes a substantially circular radiation conductor disposed on the upper surface of the second dielectric layer 12, and 41 is disposed between the first and second dielectric layers 11 and 12 at a position facing the radiation conductor 21. A substantially L-shaped line conductor, 42 is arranged so as to penetrate through the second dielectric layer 12, and extends from one end of the line conductor 41 and the center of the radiating conductor 21 in a direction orthogonal to the longitudinal direction of the line conductor 41 (see FIG. 3). Reference numeral 31 denotes a grounding conductor arranged on the lower surface of the first dielectric layer 11 to electrically connect a position displaced in (indicated by the Y direction).

According to the first and second laminated dielectric antennas of the present invention configured as described above, the longitudinal portion of the line conductor 41 and the radiating conductor 21 facing this portion are electromagnetically coupled to each other. A radio wave whose plane of polarization is parallel to the longitudinal direction of the line conductor 41 (XZ plane) is radiated from the radiating conductor 21, and one end of the connecting conductor 42 is extended from the center of the radiating conductor 21 in the longitudinal direction of the line conductor 41. By connecting to the position shifted in the direction orthogonal to the radiation conductor 21, the radiation conductor 21 radiates a radio wave having a plane (Y-Z plane) orthogonal to the longitudinal direction of the line conductor 41 as a polarization plane, thereby the polarization-sharing antenna. Can be operated as. In addition, since the line conductor 41 is arranged between the first and second dielectric layers 11 and 12, the line conductor 41 is not necessarily provided below the ground conductor 31 in terms of antenna characteristics as in the case of the conventional laminated dielectric antenna. Since it is not necessary to arrange unnecessary dielectric layers 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 low-profile dual-polarization antenna.

Further, in the first laminated dielectric antenna of the present invention, when the entire outer shape of the laminated dielectric antenna is a substantially rectangular parallelepiped shape as shown in FIGS. Since it is possible to take a wide area as a shape in accordance with, it is possible to widen the frequency band. Similarly, in the second laminated dielectric antenna of the present invention, when the outer shape of the entire laminated dielectric antenna is a substantially cylindrical shape as shown in FIG. Since it can take a large area as
The frequency band can be widened.

In forming the laminated dielectric antenna of the present invention, the first and second dielectric layers 11 and 12 and the radiation conductor 21 are formed.
The grounding conductor 31, the line conductor 41, and the connecting conductor 42 may be the same as those of various materials and forms used in a known high-frequency wiring board.

The first and second dielectric layers 11 and 12 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-
A fluororesin such as perfluoroalkoxyethylene copolymer resin (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin; PFA) or a resin-based material such as glass epoxy resin or polyimide is used. The shapes and dimensions (thickness, width, length) of the first and second dielectric layers 11 and 12 made of these materials are set according to the frequency to be used, the application, and the like.

The radiating conductor 21, the ground conductor 31, the line conductor 41, and the connecting conductor 42 are made of a metallic material for high-frequency signal transmission, such as a Cu layer, a Mo-Mn metallized layer, and a Ni-plated layer and an Au-plated layer.・ W metallized layer with Ni plating layer and Au plating layer deposited ・ Cr-Cu alloy layer ・ Cr-Cu alloy layer with Ni plating layer and Au plating layer deposited What was made ・ Ta ₂ N
Ni-Cr alloy layer and Au plating layer deposited on the layer-Pt layer and Au plating layer deposited on Ti layer, or Pt layer and A on Ni-Cr alloy layer
It is formed by a thick film printing method, various thin film forming methods, a plating method, or the like, using a u-plated layer or the like. 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, if the first and second dielectric layers 11 and 12 are made of glass ceramics, for example, first and second
Glass ceramics green sheets to be the dielectric layers 11 and 12 are prepared, and a predetermined punching process is performed on the green sheets to form the through holes in which the through conductors as the connection conductors 42 are formed. While filling the through-hole with a conductor paste such as, a predetermined transmission line pattern to be the line conductor 41 and other radiation conductors 21 and ground conductors 31
A pattern of the conductor layer to be the above is applied by printing. Then 850-1
Firing is performed at 000 ° C., and finally the surface of each conductor and conductor layer is plated with Ni and Au.

FIGS. 4 and 5 are XZ plane polarized waves and Y-planes at the resonance frequency of an example of the embodiment of the first laminated dielectric antenna of the present invention shown in FIGS. 1 and 2, respectively.
It is a radiation characteristic diagram which shows Z-plane polarization. In FIGS. 4 and 5, the numbers on the outer circumference of the circle indicate the angle (unit: unit): the vertex direction (indicated by the Z direction in FIGS. 1 and 2) is 0 °.
°), the vertical axis represents the gain (unit: dBi), and the characteristic curve represents the radiation characteristic, that is, the azimuth characteristic of the gain. The radiation characteristic shown in this diagram is obtained by using an electromagnetic field simulation. It can be seen from FIGS. 4 and 5 that the radiation characteristics having the polarization planes on the two orthogonal planes of the XZ plane and the YZ plane are obtained, and the antenna operates as a dual polarization antenna.

In the first laminated dielectric antenna of the present invention having the radiation characteristics shown in FIGS. 4 and 5, the thickness of the first dielectric layer 11: H11 is 2 mm, and the thickness of the second dielectric layer 12 is 2. Thickness: H12 is 2 mm, length of one side of the radiation conductor 21: L21 is 10
mm, and the relative dielectric constant of each of the dielectric layers 11 and 12 was 26.

8 and 9 are XZ plane polarized waves and YZ planes at the resonance frequency of an example of the embodiment of the conventional laminated dielectric antenna shown in FIGS. 6 and 7, respectively.
It is a radiation characteristic diagram similar to FIG. 4 and FIG. 5 which shows surface polarization. In FIGS. 8 and 9, 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. 6 and 7) as 0 °, and the vertical axis is the gain (unit: dB).
i), and the characteristic curve shows the radiation characteristic, that is, the azimuth characteristic of gain. The radiation characteristic shown in this diagram is also obtained by using the electromagnetic field simulation. From FIG. 8 and FIG. 9, it can be seen that the radiation characteristics having the polarization planes in the two planes orthogonal to each other in the XZ plane and the YZ plane are obtained, and the antenna operates as a dual polarization antenna.

In the conventional laminated dielectric antenna having the radiation characteristics shown in FIGS. 8 and 9, the first dielectric layer 111 is used.
Thickness: H111 is 2 mm, thickness of the second dielectric layer 112: H
112 is 4 mm, the length of one side of the radiation conductor 121: L121 is 10 m
m, and the relative permittivity of each of the dielectric layers 111 and 112 was set to 26.

Incidentally, this conventional laminated dielectric antenna is
Compared with the first laminated dielectric antenna of the present invention which has obtained the results shown in FIGS. 4 and 5, the point that the first dielectric layer 111 is arranged below the ground conductor 131, and the line conductor 141 is 1 is disposed on the lower surface of the dielectric layer 111, the second connection conductor 142b is disposed, and the first and second openings 143a and 143b.
All are the same except that is placed. The thickness of the second dielectric layer 112, that is, the radiation conductor 121 and the ground conductor 13
The distance from 1 is 4 mm, which is the distance between the radiation conductor 21 and the ground conductor 31 of the first laminated dielectric antenna of the present invention. The total thickness of the first and second dielectric layers 11 and 12 is 4 mm. This is because it was matched with. From the above, with respect to the thickness of the antenna, the thickness of the first laminated dielectric antenna of the present invention, which has obtained the results of FIGS. 4 and 5, is 4 mm, while that of FIG.
The thickness of the conventional laminated dielectric antenna used to obtain the results shown in FIG. 9 is 6 mm, and 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 and 2, a dielectric layer is formed below the ground conductor 131 like the dual polarization antenna using the conventional laminated dielectric antenna shown in FIGS. 6 and 7. Since it is not necessary to dispose 111, it is possible to provide a laminated dielectric antenna that can be used as a low-profile dual-polarization antenna.

It should be noted that the present invention is not limited to the examples of the above embodiments, and various modifications can be made without departing from the gist of the present invention. For example, a plurality of radiation conductors may be arranged at a position facing the ground conductor, and with such a configuration, resonance can occur in each radiation conductor and multi-frequency common characteristics can be obtained. Further, when the line conductor 41 is formed into a substantially L shape, as shown in a perspective plan view similar to FIG. 2 in FIG. 10, a line conductor 41 ′ may be formed by bending a bent portion of the substantially L shape. Of course, with such a configuration, the length of the line conductor 41 'becomes shorter than that of the line conductor 41 which is bent in a substantially L shape as shown in FIG. The efficiency can be improved.

[0025]

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 substantially quadrangular or substantially circular radiating conductor provided on the upper surface of the second dielectric layer, and a radiating conductor disposed between the first and second dielectric layers and facing each other. A substantially L-shaped line conductor, and a position which is arranged so as to penetrate through the second dielectric layer and which is displaced from one end of the line conductor and the center of the radiation conductor in a direction orthogonal to the longitudinal direction of the line conductor. And a grounding conductor disposed on the lower surface of the first dielectric layer. Therefore, the radiation conductor is changed from the radiation conductor to the line conductor by electromagnetic coupling between the longitudinal portion of the line conductor and the radiation conductor. Radio waves with a plane of polarization parallel to the longitudinal direction of the By connecting to the position shifted from the center of the conductor in the direction orthogonal to the longitudinal direction of the line conductor, the radiation conductor radiates radio waves with the plane orthogonal to the longitudinal direction of the line conductor as the polarization plane, thereby sharing the polarization. It can be operated as an antenna. Further, since the line conductor is arranged between the first and second dielectric layers, a dielectric which is not necessarily required from the viewpoint of antenna characteristics under the ground conductor as in the case of the conventional laminated dielectric antenna. Since it is not necessary to arrange layers, it is possible to provide a laminated dielectric antenna that can be used as a low-profile dual-polarization antenna.

As described above, according to the present invention, it is possible to provide a laminated dielectric antenna which 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 perspective plan view showing an example of an embodiment of a first laminated dielectric antenna of the present invention.

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

FIG. 4 is a diagram showing an example of radiation characteristics of the first laminated dielectric antenna of the present invention.

FIG. 5 is a diagram showing an example of radiation characteristics of the first laminated dielectric antenna of the present invention.

FIG. 6 is a perspective view showing an example of a conventional laminated dielectric antenna.

FIG. 7 is a perspective plan view showing an example of a conventional laminated dielectric antenna.

FIG. 8 is a diagram showing an example of radiation characteristics of a conventional laminated dielectric antenna.

FIG. 9 is a diagram showing an example of radiation characteristics of a conventional laminated dielectric antenna.

FIG. 10 is a perspective plan view showing another example of the embodiment of the first laminated dielectric antenna of the present invention.

[Explanation of symbols]

11 ... First dielectric layer 12 ... second dielectric layer 21 ... Radiation conductor 31 ... Grounding conductor 41, 41 '... Line conductor 42 ... Connecting conductor

Claims (2)

[Claims] 1. A first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and a substantially rectangular shape disposed on the upper surface of the second dielectric layer. And a substantially L-shaped line conductor whose longitudinal direction is arranged parallel to one side of the radiation conductor, at a position facing the radiation conductor between the first and second dielectric layers. A connection conductor that is disposed so as to penetrate through the second 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. And a ground conductor disposed on the lower surface of the first dielectric layer. 2. A first dielectric layer, a second dielectric layer laminated on the first dielectric layer, and a substantially circular shape arranged on the upper surface of the second dielectric layer. Of the radiation conductor, the line conductor having a substantially L-shape disposed between the first and second dielectric layers at a position facing the radiation conductor, and the line conductor penetrating through the second dielectric layer. And a connection conductor for electrically connecting 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, and a connection conductor on the lower surface of the first dielectric layer. And a grounded conductor that has been formed.