JP2001177327A - Antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antenna that is operates in two frequency bands and has two kinds of directivities. SOLUTION: This antenna consists of 4 conductive layers, having conductive patterns and 3 dielectric layers 11 provided between the conductive layers, the conductive pattern of the 1st layer and the conductive pattern of the 4th layer are sequentially and alternately connected by a through-hole 13, provided to the 3rd dielectric layer to form a spiral antenna element, and a conductive pattern 12 of a 2nd layer and the conductive pattern 12 of a 3rd layer are connected sequentially and alternately by a through-hole 16 provided to the 2nd dielectric layer, to configure the spiral-shaped antenna element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna mainly used for a mobile communication terminal or the like, and more particularly to an antenna which operates alone in two frequency bands.

[0002]

2. Description of the Related Art In a mobile communication system or the like, a method of using a plurality of antennas for each band or providing two antennas for diversity is adopted for a terminal or the like used at a plurality of frequencies. . Further, a helical antenna is used for the first frequency band, and a dual-frequency shared antenna composed of helical antennas of different sizes, such as a monopole antenna provided inside the helical and a second frequency band, is used. .

[0003]

However, it is inconvenient to use a plurality of antennas in order to obtain a plurality of frequency bands and directivities, and if a coil-shaped element is used as a helical antenna, the structure is disadvantageous. However, there is a problem that it is difficult to finely adjust the mountability and characteristics as compared with other electronic components.

Accordingly, it is an object of the present invention to provide an antenna which operates in two frequency bands and has two directivities.

[0005]

In order to solve the above-mentioned problems, an antenna according to the present invention comprises four conductive layers having a plurality of conductive patterns and three dielectric layers provided between the conductive layers. The first and fourth conductive patterns are connected alternately by through holes provided in the dielectric layer to form a spiral antenna element, and the second and third conductive patterns are formed. The patterns are sequentially and alternately connected by through holes provided in the dielectric layer to constitute a second spiral antenna element.

The antenna according to the present invention comprises three conductive layers having one or a plurality of conductive patterns and two dielectric layers provided between the conductive layers. The conductive pattern of the layer is a spiral antenna element which is connected alternately and sequentially by through holes provided in the dielectric layer, and the conductive pattern of the second layer constitutes a planar antenna element. It is. In addition,
In the present antenna, the conductive pattern of the second layer may have either a linear shape or a meandering shape.

That is, the present invention provides an antenna comprising four conductive layers having a plurality of conductive patterns and three dielectric layers provided between the conductive layers. Is electrically connected alternately by through holes provided in the three dielectric layers to form a spiral antenna element, and the second and third conductive patterns are This is an antenna that is connected alternately and sequentially by through holes provided in a second dielectric layer to form a spiral antenna element.

The antenna according to the present invention is an antenna comprising three conductive layers having one conductive pattern or a plurality of conductive patterns, and two dielectric layers provided between the conductive layers. The first-layer and third-layer conductive patterns are sequentially connected alternately by through holes provided in the three dielectric layers to form a spiral antenna element, and the second-layer conductive pattern is This constitutes a planar antenna element.

Further, the present invention provides the above-mentioned antenna,
An antenna in which the second-layer conductive pattern has a linear shape.

[0010] The present invention also provides the above-mentioned antenna,
An antenna in which the conductive pattern of the second layer has a meandering shape.

Further, the present invention provides the above-mentioned antenna,
This is an antenna in which a part of an antenna element provided in an internal conductive layer and a feeder provided in a surface layer are electrically connected through through holes.

Further, the present invention provides the above-mentioned antenna,
This is an antenna in which a part of an antenna element provided in an internal conductive layer and an adjustment unit provided in a surface layer are electrically connected by through holes.

Further, the present invention provides the above-mentioned antenna,
This is an antenna having a gap between a part of the antenna element and the power supply unit.

Further, the present invention provides the above-mentioned antenna,
This is an antenna in which one end of a spiral or meandering antenna element is grounded to an electronic circuit board or a housing, and power is supplied from a location where impedance is matched in the middle of the antenna element.

Further, according to the present invention, in the above antenna,
This is an antenna in which one or both electrode layers exposed to the outside are covered with a dielectric layer.

Further, the present invention is the substrate-integrated antenna formed on a part of a laminated electronic component mounting substrate used for a communication terminal or the like.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An antenna according to an embodiment of the present invention will be described below.

(Embodiment 1) FIG. 1 is an explanatory view of an antenna according to Embodiment 1 of the present invention. FIG. 1 (a) is an overall perspective view, and FIG. It is a perspective view which shows a part structure.

In FIG. 1, 1 is an antenna, and 1a is a partial structure inside the antenna. The antenna 1 includes four conductive layers having a plurality of conductive patterns 12 and 15, and three dielectric layers 11 provided between the conductive layers.

The first and fourth conductive patterns 12 on the front and back of the antenna are spirally formed by sequentially connecting the inner walls provided on the dielectric layer alternately with through holes 13 made of a conductive member. And the conductive pattern 15 of the second and third layers formed on both surfaces of the central dielectric layer, as shown in the partial structure 1a inside the antenna, A spiral antenna element is formed by being alternately and sequentially connected by the through holes 16.

Each of the antenna elements is connected at one end of the helix to a feeder 14 provided on one surface of the antenna 1 through a through hole similar to the above, and the antenna 1 of the present invention is fed on the same surface. It is also easy to directly arrange and mount on an electronic circuit board or the like.

(Embodiment 2) FIG. 2 is an explanatory view of an antenna according to Embodiment 2 of the present invention. FIG. 2 (a) is a perspective view of the whole, and FIG. It is a perspective view which shows a part structure. In FIG. 2, 2 is an antenna, and 2a is a partial structure inside the antenna.

The antenna according to the present invention comprises three conductive layers having a plurality of conductive patterns 22 and 28, and two dielectric layers 21 provided between the conductive layers. First and third conductive patterns 22 on the front and back of antenna 2
The inner wall provided in the dielectric layer is sequentially and alternately connected by through holes 23 formed of a conductive member to form a spiral antenna element. Also, as shown in a partial structure 2a inside the antenna, The second-layer conductive pattern 28 formed on one surface of the dielectric layer forms a second antenna element.

The spiral antenna element has one end connected to a short-circuit portion 24 provided on one surface of the antenna 1 through a through hole, and the short-circuit portion 24 is connected to a ground layer or a housing of an electronic circuit. I do. In addition, power is supplied to the power supply unit 27 in the middle of the spiral by the power supply line 26. According to this structure, the power supply unit can be provided at any position where alignment can be achieved. Naturally, if it is in the middle of a spiral, it can be set appropriately other than on the surface.

Power is supplied to the second antenna element from the power supply unit 25 through the through hole 29. Further, in the antenna 2, one end of the second antenna element is connected to the adjustment part 32 on the antenna surface through the through hole 30, and the conductive patterns of the adjustment parts 31 and 32 are slightly added and removed, It is possible to finely adjust the resonance frequency on one surface of the antenna 2.

In the antenna of the present invention, the conductive pattern used as the antenna element may be, for example, as shown in FIG. 3 in accordance with various purposes such as a desired frequency band, directivity, and gain in addition to the above-mentioned ones. Such various structures may be used, or a combination thereof may be used. That is, it may have a substantially linear shape like 3a in FIG. 3 or a meander shape like 3b, 3c, 3d. Further, as shown in 3e, the shape may be such that the projected area changes continuously in the longitudinal direction, but it goes without saying that the present invention is not limited to these examples.

As described above, the antenna of the present invention can supply power on the same surface, and can be easily mounted on an electronic circuit board.

Further, as shown in FIG. 4, the antenna of the present invention can easily be a board-integrated mounting antenna formed on a part of a multilayer electronic component mounting board used for a communication terminal or the like. It is possible.

As described above, according to the antenna of the present invention, a three-dimensional structure in which a plurality of helical or other antenna elements are combined with an antenna element by an appropriate conductive pattern and a through-hole connecting these elements is provided. An antenna having a simple element arrangement can be obtained.

Further, according to the present invention, a mountable antenna capable of supplying power from one surface of the antenna can be obtained. Also,
According to the present invention, it is possible to obtain a laminated antenna in which the frequency can be finely adjusted and the impedance can be arbitrarily adjusted. Further, according to the present invention, a board-integrated mounting antenna formed on a part of a laminated electronic component mounting board used for a communication terminal or the like can be obtained.

[0031]

As described above, according to the present invention, it is possible to provide an antenna which operates in two frequency bands and has two types of directivity.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an antenna according to a first embodiment of the present invention. FIG.
FIG. 1A is an overall perspective view, and FIG. 1B is a perspective view showing a partial internal structure.

FIG. 2 is an explanatory diagram of an antenna according to a second embodiment of the present invention. FIG.
FIG. 2A is an overall perspective view, and FIG. 2B is a perspective view showing a partial internal structure.

FIG. 3 is a diagram showing a shape of an antenna element in the antenna according to the present invention.

FIG. 4 is a schematic view showing an example of a state in which the antenna of the present invention is mounted on a part of a laminated electronic component mounting board used for a communication terminal or the like.

[Explanation of symbols]

 1, 2, antenna 1a, 2a Partial structure inside antenna 13, 16, 23, 29, 30 Through hole 3a, 3b, 3c, 3d Antenna element 11, 21 Dielectric layer 12, 15, 22, 28 Conductive pattern DESCRIPTION OF SYMBOLS 14 Power supply part 24 Short circuit part 25, 27 Power supply part 26 Power supply line 31, 32 Adjustment part 41 Communication terminal device housing 42 Antenna part 43 Mounting substrate

Claims (10)

[Claims] 1. An antenna comprising four conductive layers having a plurality of conductive patterns and three dielectric layers provided between the conductive layers, wherein the first and fourth conductive patterns are provided. Are connected alternately and sequentially by through holes provided in the three dielectric layers to form a helical antenna element, and the second and third conductive patterns are An antenna characterized in that a spiral antenna element is formed by sequentially and alternately connecting through holes provided in a dielectric layer. 2. An antenna comprising three conductive layers having one or a plurality of conductive patterns and two dielectric layers provided between the conductive layers. The conductive pattern forms a spiral antenna element that is connected alternately and sequentially by through holes provided in three dielectric layers, and the conductive pattern of the second layer forms a planar antenna element. Features antenna. 3. The antenna according to claim 2, wherein the conductive pattern of the second layer has a linear shape. 4. The antenna according to claim 2, wherein the conductive pattern of the second layer has a meandering shape. 5. The antenna according to claim 1, wherein a part of the antenna element provided in the internal conductive layer and a feeder provided in the surface layer are electrically connected by a through hole. Antenna. 6. The antenna according to claim 1, wherein a part of the antenna element provided in the internal conductive layer and an adjusting part provided in the surface layer are electrically connected by a through hole. Antenna. 7. The antenna according to claim 1, wherein an air gap is provided between a part of the antenna element and the power supply unit. 8. The antenna according to claim 1, wherein one end of the spiral or meandering antenna element is grounded to an electronic circuit board or a housing, and an impedance of the antenna element is set in the middle of the antenna element. An antenna characterized in that power is supplied from a matching position. 9. The antenna according to claim 1, wherein one or both electrode layers exposed to the outside are covered with a dielectric layer. 10. The antenna according to claim 1, which is a board-integrated (mounted) antenna formed on a part of a laminated electronic component mounting board used for a communication terminal or the like. An antenna, characterized in that: