JP2003218618A - Antenna element and its mount method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna element capable of attaining excellent frequency characteristics by preventing occurrence of position deviation, tilt or floating of the antenna element caused by soldering at mounting and to provide its mount method. <P>SOLUTION: The antenna element 10 is provided with: a first conductor 14 consisting of linear conductors and whose start terminal receives power; a short-circuit conductor 15 connected to the end of the first conductor 14 nearly at a right angle; a second conductor 16 connected to the end of the short-circuit conductor 15 nearly at a right angle and placed in parallel with the first conductor; an element base 11 the outer face of which conductor lines comprising the first conductor 14, the short-circuit conductor 15 and the second conductor 16 made of at least a dielectric material or a magnetic substance; a ground conductor 17 which is formed to the element base 11, whose end terminal is connected to the conductor line and whose start terminal receives a ground level; and a fixed electrode 31 not connected to the conductor line to prevent mount deviation of the terminal base 11. <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 an antenna element having a conductor line formed on the outer surface of an element substrate and an antenna device having this antenna element as a part, and particularly to an antenna element mounted on a circuit board and the same. Regarding mounting method

[0002]

2. Description of the Related Art Currently, PHS (registered trademark) (Personal H
Wireless communication devices called andy-phone systems) and mobile phones have become widespread, and there has been a demand for reduction in size and weight. A wireless communication device transmits and receives radio waves with an antenna device, but if the conductor line on the antenna element is shortened for downsizing, the resonance frequency rises, making it difficult to transmit and receive radio waves of the desired frequency with good efficiency. Becomes

Therefore, as a technique for downsizing an antenna element while maintaining a required resonance frequency, for example, Japanese Patent Application No.
A parallel two-line antenna as shown in No. 01-026002 has been proposed.

The antenna device of the above application includes an element base and a conductor line, and the conductor line includes at least a feeding conductor, a first conductor, a short-circuit conductor, and a second conductor.

The element substrate is made of at least one of a dielectric and a magnetic material, and has a power feed conductor, a first conductor, a short conductor and a second conductor. The power supply lead wire is made of a linear conductor, and electric power is supplied to the starting end. The first conducting wire is connected at a right angle to the end of the power feeding conductor, and the short-circuiting conductor is connected at a right angle to the end of the first conducting wire on the side opposite to the power feeding conductor. The second conducting wire is connected at a right angle to the end of the short-circuiting conducting wire and is located parallel to the first conducting wire. Further, a grounding conductor is also formed on the element substrate, and the grounding conductor functions as a short pin when the termination is connected to the conductor line and the grounding potential is applied to the beginning end.

The conventional antenna element has such a structure, is mounted on a circuit board, and operates as an antenna device.

[0007]

FIG. 3 is a perspective view showing the above-described antenna device as a conventional example. As shown in FIG. 3, the antenna element 30 described above is an element substrate 1 made of a dielectric material.
A conductor line is formed on the upper surface and the side face of the printed wiring board 1 by a printed wiring, and the conductor line is composed of a feed line 13, a first line 14, a short-circuit line 15 and a second line 16 which are continuously formed in a linear shape. .

More specifically, the feeder line 13 of the conductor line
Is a straight line portion formed from the lower surface to the upper surface on the side surface of the element substrate 11, and the first conducting wire 14 is the feeding conducting wire 1
It is composed of a straight line portion formed in the depth direction in the drawing from the upper end which is the end of 3. In addition, the short-circuit conductor 15 is the first conductor 14
The first conducting wire 14 is formed at a right angle from the upper left end which is the end of the first conductor wire 14 to the right side in the figure.
5 is formed at a right angle to the first conductor wire 14 and is parallel to the first conductor wire 14.

A grounding conductor 17 is connected to a predetermined position of the short-circuiting conductor 15, and the grounding electrode 2 is connected to the grounding conductor 17.
A ground potential of 2 is applied by the ground wiring 24. Therefore, the ground conductor 17 can function as a short pin.

An antenna device using the antenna element 30 as described above includes a circuit board 21 made of glass epoxy resin, and a copper foil is attached to the upper surface of the circuit board 21 on the front side. Ground electrode 22 is formed. Further, the power supply electrode 23 and the ground wiring 24 are also formed.

However, in the antenna element as described above,
Due to the miniaturization of the element, during mounting, the fixing by solder becomes only the connecting portions 18a, 18b and 19 on the lower surface of the element substrate, and the fixing strength becomes weak.

Further, in soldering at the connecting portion 19, the element substrate is pulled toward the ground conductor side due to the surface tension of the flux, the position of the antenna element is displaced, or the antenna element floats on the side opposite to the ground conductor. A gap may be formed between the antenna and the substrate, and the frequency characteristics of the antenna may change.

Therefore, the present invention provides an antenna element and a method for mounting the antenna element, which can prevent positional deviation, inclination, or rising of the antenna element that occurs during soldering during mounting, and can obtain good frequency characteristics. The task is to do.

[0014]

As means for solving the problems, in the antenna element as described above, a fixing electrode which is not connected to the conductor line is added to the side surface opposite to the surface on which the ground conductor is provided. The fixing strength is increased by fixing the element substrate at three locations of the three connecting portions and the fixing electrodes, and the fixing electrodes have a force equivalent to the surface tension of the solder flux at the connecting portion of the ground conductor. By being added to the side, mounting deviation of the antenna element can be prevented.

That is, the antenna element of the present invention is composed of a linear conductor and is supplied with electric power at the starting end thereof, a short-circuiting conductor connected to the end of the first conducting wire at a substantially right angle, and the short-circuiting conductor. A conductor consisting of a second conductor which is connected to the terminal end of the wire at a substantially right angle and which is located parallel to the first conductor, and which comprises at least one of a dielectric and a magnetic substance, the first conductor, the short-circuit conductor and the second conductor. An element substrate having a line formed on the outer surface thereof, a grounding conductor formed on the element substrate, having a terminal end connected to the conductor line and having a ground potential applied to the starting end thereof, and further mounting displacement of the element substrate. And a fixing electrode that is not connected to the conductor line for preventing.

The fixing electrode is preferably formed on the surface of the element substrate facing the surface on which the grounding conductor is formed, and is also formed on the surface in contact with the circuit board so as to be integrated.

In the antenna element mounting method of the present invention, the antenna device may be formed by soldering four points symmetrically provided with respect to the center of the surface of the antenna element that contacts the circuit board. .

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. However, the same parts as those of the antenna element described above in the following embodiments will be denoted by the same names, and detailed description thereof will be omitted. In addition, in the present embodiment, the front, rear, left, right, up, and down directions are referred to in correspondence with the drawings, but this is used for the sake of convenience for simplifying the description, and the actual product is manufactured or used. The direction of is not limited.

(Embodiment 1) FIG. 1 is a perspective view showing an antenna device according to a first embodiment of the present invention. As shown in FIG. 1, the antenna element 10 of the present embodiment also has
Similar to the antenna element 30 described above, conductor lines are formed on the upper surface and the side surfaces of the element base body 11 made of a dielectric material. The conductor lines include the feeding conductor wire 13, the first conductor wire 14, the short-circuiting conductor wire 15, and the second conductor wire. It consists of 16.

However, the antenna element 10 of the present embodiment
Unlike the antenna element 30 described above, the fixing electrode 31 is formed on the side surface of the element base 11 opposite to the surface on which the grounding conductor is provided, at a position symmetrical to the grounding conductor.

The fixing electrode 31 is also formed so as to extend to the lower surface of the element substrate 11, and the portion formed on this lower surface corresponds to the connecting portion 19 of the ground conductor 17.

As described above, by soldering at the four connection points provided symmetrically with respect to the center of the lower surface of the element base, the force applied to the antenna element at the time of soldering is symmetrical. Therefore, the antenna elements are fixed in balance with each other, and an antenna device having excellent frequency characteristics can be obtained.

(Second Embodiment) As another embodiment, it is possible to adjust the resonance frequency by changing the size of the fixing electrode 31. FIG. 2 is a perspective view showing an antenna device according to a second embodiment of the present invention.

In FIG. 2, reference numeral 20 designates an antenna element, and other numerals are the same as those in FIGS. 1 and 3. Here, the fixing electrode 31 has a larger area on the side surface of the element substrate 11 than in the case of FIG. On the other hand, the element substrate 1
The area of the lower surface of 1 is the same as that of the case of FIG. This is because, in soldering, as in the first embodiment, fixing is performed in a balanced manner, and the resonance frequency is adjusted by the conductor portion formed on the side surface.

In the above embodiment, the case of the dielectric antenna using the dielectric as the element substrate has been described, but the fixing electrode provided in the antenna element of the present invention is
The element substrate is a composite element substrate of dielectric and magnetic material,
It is clear that even an element substrate made of only a magnetic material is effective in mounting an antenna element with high accuracy by soldering.

[0026]

According to the present invention, the fixing strength of the element substrate can be increased by fixing the antenna element substrate to the 4-terminal type by providing the fixing electrodes in addition to the three connecting portions.

Further, a fixing electrode is attached to a side surface opposite to the surface on which the grounding wire is provided at a position symmetrical to the grounding wire, whereby the surface tension of the flux causes a positional displacement of the antenna element and a gap between the antenna element and the substrate. Can be prevented.

It is also possible to adjust the resonance frequency by changing the size of the fixing electrode formed on the element substrate.

[Brief description of drawings]

FIG. 1 is a perspective view showing an antenna device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an antenna device according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional antenna device.

[Explanation of symbols] 10,20 Antenna element 11 element base 13 power supply lead 14 First conductor 15 short-circuit conductor 16 Second conductor 17 Ground conductor 18a, 18b, 19 Connection part 21 circuit board 22 Ground electrode 23 Feeding electrode 24 Ground wiring 31 Fixed electrode

Claims (3)

[Claims] 1. A first conducting wire made of a linear conductor to which electric power is supplied to a starting end thereof, a short-circuiting conductor connected to an end of the first conducting wire at a right angle, and a right end of the shorting conductor at a substantially right angle. A second conductive wire connected and positioned in parallel with the first conductive wire, and a conductor line made of at least one of a dielectric and a magnetic material, the first conductive wire, the short-circuited conductive wire, and the second conductive wire are formed on the outer surface. An element base, a grounding conductor formed on the element base and having a terminal end connected to the conductor line and a ground potential applied to the starting end, and the conductor line for preventing mounting deviation of the element base. An antenna element comprising a fixing electrode which is not connected to. 2. The fixing electrode is formed on a surface of the element substrate opposite to a surface on which the ground conductor is formed, and is also formed on a surface in contact with a circuit board to be integrated. The antenna element according to claim 1. 3. The antenna device according to claim 1, wherein the antenna device is manufactured by soldering at four locations symmetrically provided with respect to the center of the surface of the antenna element that contacts the circuit board. A method of mounting an antenna element, comprising: