JPH1041721A - Antenna for portable communication terminal and portable communication terminal using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate inconvenience by being projected to the outside and to easily demonstrate prescribed performance by mounting an antenna for a portable communication terminal on the surface of a case main body through a fixing material. SOLUTION: This antenna A for the portable communication terminal is provided with a substrate 12, a first conductor 13 mounted to the substrate 12 and a second conductor 14 to be electrically paired with the first conductor 13. The substrate 12 is surrounded by the fixing material 11. The fixing material 11 is composed of the synthetic resin material of the excellent transmissivity of radio waves and is molded in a prescribed outer shape. The fixing material 11 fixes the substrate 12 to the inside and projects a connector 16 to the outside. By providing the substrate 12 mounted to the surface of the case main body through the fixing material 11, the first conductor 13 on the substrate 12 and the second conductor 14 in such a manner, the whole is integrally constituted with the surface of the case main body without being projected to the surface of the case main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for a portable communication terminal suitable for a portable communication terminal such as a portable telephone, a simple portable telephone, a pager, a portable information processing terminal, and a portable communication terminal using the same. .

[0002]

2. Description of the Related Art An antenna for transmitting and receiving radio waves is incorporated in a portable communication terminal.

[0003] Conventional antennas for portable communication terminals are mainly rod-shaped antennas which are incorporated in a case body constituting the portable communication terminal so as to be freely retractable. These antennas are externally connected to the case body when transmitting and receiving radio waves. By pulling out and protruding long, predetermined performance can be exhibited. Also, instead of a rod-type antenna, a helical antenna that always projects short from the case body is known, and there is also a built-in antenna that is built into the case body.

[0004]

According to the prior art, since the rod-type and helical-type antennas need to protrude from the case main body to the outside, it is difficult to use the antennas when using them.
It is inconvenient when storing, carrying, etc., and there is a risk that the eyes may be hit, and there is a problem that it is easily damaged by a slight external force. Further, since the antenna protrudes from the case body, there is a problem that the overall appearance is not good.

Further, the built-in type antenna has a problem that it is easily affected by the internal components and it is difficult to exhibit a predetermined performance.

In view of the above-mentioned problems in the prior art, an object of the present invention is to remove the inconvenience caused by projecting to the outside by mounting it on the surface of a case body via a fixing member, and to achieve a predetermined performance. An object of the present invention is to provide an antenna for a mobile communication terminal that can be easily exerted and a mobile communication terminal using the antenna.

[0007]

Means for Solving the Problems In order to achieve the above object, a first invention according to the present application comprises a substrate mounted on the surface of a case body via a fixing member, and a first substrate mounted on the substrate. The gist of the present invention is to provide a conductor and a second conductor that is electrically paired with the first conductor.

[0008] The fixing member can be formed in a hollow shape.

The second conductor can be provided at right angles to the substrate, and can be formed in the shape of a tongue or a tube.

[0010] Further, the second conductor may form a loop together with the first conductor on the substrate.
May form a folded loop.

The gist of the configuration of the second invention is to provide the antenna according to the first invention on the transmitter side of the case body.

[0012]

According to the structure of the first aspect of the invention, the first conductor on the substrate is mounted on the surface of the case body via the fixing member, so that the entire structure can be integrally formed with the surface of the case body. As a result, no special protruding portion is formed on the case body. However, the second conductor paired with the first conductor is housed in the case body or mounted on the substrate. The fixing material used at this time is an absolutely green synthetic resin material having good radio wave transmittance.

If the fixing material is formed in a hollow shape, the substrate in the fixing material can be supported in the cavity, and the first conductor on the substrate can be kept in the best green state.

When the second conductor is provided at right angles to the substrate, it is extremely easy to mount the second conductor at the corner of the case body because the entire shape is L-shaped.

The tongue-shaped second conductor can be disposed in parallel with the cable connected to the first conductor, and the second cylindrical conductor can be provided.
These conductors allow a cable to be inserted therein, and in any case, the required space in the case body can be minimized.

When the second conductor forms a loop together with the first conductor, the first and second conductors form a loop antenna as a whole, and a high gain can be realized. In addition, the shape of the loop can be formed in an arbitrary shape such as a circle, a square, and a rectangle on the substrate.

If the first and second conductors form a folded loop, the entire length of the substrate on which the first and second conductors are mounted can be further reduced.

According to the configuration of the second aspect of the present invention, since the position of the antenna at the time of transmission can be kept away from the user's head, the concern that the electric field due to the microwave will have an adverse effect on the brain is minimized. can do.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

The antenna A for the portable communication terminal is connected to the substrate 12
And a first conductor 13 mounted on the substrate 12 and a second conductor 14 electrically paired with the first conductor 13 (FIGS. 1 and 2).

The substrate 12 is made of a highly green plate material having good high frequency characteristics such as Teflon.
A through hole 12a for connection is formed. Substrate 12
The connector 16 at the position of the through hole 12a.
The cable 15 is attached via the. Cable 15
Is a coaxial cable, and the tip of the center conductor 15a is connected to the center electrode 16a of the connector 16. Also,
The outer conductor 15b of the cable 15 is connected to a threaded outer cylinder of the connector 16.

The first conductor 13 is mounted on the substrate 12 with the through hole 12a as one end. First conductor 13
Is electrically set to d1 = [lambda] / 4 with respect to the wavelength [lambda] of the radio wave to be used. On the other hand, the second conductor 14 is formed in a tongue shape, and a ring-shaped tag 14a is formed at one end by bending at a right angle. Also,
Similarly to the first conductor 13, the length d2 of the second conductor 14 is electrically set to d2 = .lambda. / 4.

The cable 15 connects the connector 16 to the board 12
Is mounted on the substrate 12 so as to be vertically provided on the back side of the substrate. The center electrode 16a of the connector 16 is connected to one end of the first conductor 13 via the through hole 12a. The second conductor 14 inserts the outer cylindrical portion of the connector 16 into the tag 14a, fixes it to the connector 16 via the washer 16b and the nut 16c, and electrically connects the cable 15 through the outer cylindrical portion of the connector 16. It is connected to the external conductor 15b. The second conductor 14 is provided at right angles to the substrate 12 and is provided in parallel with the cable 15.

The periphery of the substrate 12 is surrounded by the fixing member 11 (FIGS. 1 and 3). The fixing member 11 is made of a synthetic resin material having a good radio wave transmittance, and is formed into a predetermined outer shape. The fixing member 11 fixes the substrate 12 inside and makes the connector 16 project outside.
However, the fixing member 11 may be formed in a solid shape (see FIG. 3).
(A), and may be formed in a hollow shape having a cavity 11a therein (FIG. 2B).

The antenna A for a portable communication terminal can be buried and attached to a part of a case body C of a portable telephone (FIGS. 4 and 5). The case body C is a body part C1.
And a cover C2 having a built-in transmitter on the inner side of the distal end portion. The cover C2 is attached to the main body C1 so as to be openable and closable. Antenna A is fixed material 1
1, the whole is fitted so as to fit into the tip of the cover C2. It is assumed that at least one surface of the fixing member 11 in the longitudinal direction is exposed on the surface of the cover C2. The connector 16 is inserted into a mounting hole C2a of the cover C2, and is fixed to the cover C2 via a nut 16c. The cable 15 passes through the inside of the cover C2 and is led to a communication unit (not shown) built in the case body C1.

Therefore, in such a portable telephone, when the cover C2 is opened and a call is made, the upper part of the main body C1 containing the handset is placed on the ear, and the tip of the cover C2 containing the handset is positioned near the mouth. Therefore, the position of the antenna A can be sufficiently separated from the head of the user. Also, antenna A is
The cover C2 is formed integrally with the cover C2 with the fixing member 11 interposed therebetween, so that no special projecting portion is formed on the surface of the cover C2.

In the above description, the first conductor 13
A zigzag pattern may be formed on the substrate 12 (FIG. 6A). Further, the first conductor 13 may be formed in a waveform (FIG. (B)), or the tip may be folded back in a hook shape (FIG. (C)). The amount of inductance distributed on the first conductor 13 can be increased, and the overall size can be reduced.

The second conductor 14 may be formed in a cylindrical shape (FIG. 7). At one end of the second conductor 14, a screw hole 14b that fits a screw of the outer cylindrical portion of the connector 16 is formed. Therefore, the second conductor 14 allows the cable 15 to pass through the inside and can be connected to the connector 16 via the screw hole 14b.

Note that the case body C of the mobile phone is
When the antenna A is formed integrally without the antenna 2 (FIG. 8), the antenna A may be attached to the lower end of the case body C on the side where the transmitter is built in. However, a receiver is incorporated in the upper part of the case body C.

[0030]

Other Embodiments The second conductor 14 may form a loop on the substrate 12 together with the first conductor 13 (FIG. 9). The first and second conductors 13 and 14 form a rectangular loop on the substrate 12, and one end of the first conductor 13 is
Connected to the center conductor 15a of the cable 15,
One end of the conductor 14 is connected to the outer conductor 15b of the cable 15. The length d3 of the first and second conductors 13 and 14 is electrically set to d3 = [lambda] / 2 with respect to the wavelength [lambda]. That is, the first and second conductors 13,
14 can form a loop antenna on the substrate 12. The first and second conductors 13 and 14 are
Square or circular loops may be formed.

The first and second conductors 13 and 14 are
Above, a folded loop may be formed (FIG. 1
0). However, one ends of the first and second conductors 13 and 14 are connected to the center conductor 15a and the outer conductor 15b of the cable 15 via the terminals 12b1 and 12b2. The folded length d4 of the first and second conductors 13 and 14 is equal to the wavelength λ.
Is electrically set to d4 = .lambda. / 4.

The antenna A shown in FIG. 10 has a folded length d4 of the first and second conductors 13 and 14 of 28 mm, an interval d5 of 3 mm, and a conductor width of 0.11 mm on the Teflon substrate 12.
When designed for the 1.9 GHz band, the voltage standing ratio characteristics shown in FIG. 11 were obtained. That is, this antenna A
Is the minimum frequency f1 = 1.7364 GHz and the maximum frequency f
In the range of 2 = 1.9218 GHz, the voltage standing wave ratio was 1.5 or less, and a bandwidth of 185.4 MHz could be obtained.

On the other hand, the horizontal directivity characteristics of the antenna A of FIG. 10 are as shown in FIG. However, FIG.
The case where the antenna A is installed horizontally with respect to the test radio wave S is shown, and FIG. 2B shows the case where the antenna A is installed vertically. That is, the antenna A is almost omnidirectional when installed horizontally, but exhibits a broad figure-eight characteristic when installed vertically. At this time, the gain of the antenna A was a maximum of about 13.7 dB as compared with the standard half-wave dipole antenna.

In the above description, the antenna A can be suitably used for any portable communication terminal such as a simple portable telephone, a pager, a portable information processing terminal and the like, not limited to a portable telephone. Also, the antenna A of FIG.
By utilizing the horizontal directivity characteristic of 2 (B), it can be incorporated in the case body C so that the electric field radiated toward the human body during use is minimized.

[0035]

As described above, according to the present invention, by providing a substrate mounted on the surface of a case body via a fixing material, a first conductor and a second conductor on the substrate are provided. The whole can be integrally formed with the surface of the case main body without protruding from the surface of the case main body, so that there is no possibility of unexpected danger or breakage at the time of use or the like. There is an excellent effect that a specific appearance can be realized and a predetermined performance can be easily exhibited.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of the overall configuration.

FIG. 2 is an overall exploded perspective view.

FIG. 3 is an enlarged cross-sectional view corresponding to line XX of FIG. 2;

FIG. 4 is a perspective view of a use state.

FIG. 5 is an enlarged cross-sectional view corresponding to the line YY in FIG. 4;

FIG. 6 is a view (1) corresponding to FIG. 1 showing another embodiment.

FIG. 7 is an essential part perspective view showing another embodiment.

FIG. 8 is a diagram corresponding to FIG. 4, showing another embodiment.

FIG. 9 is a diagram (2) corresponding to FIG. 1, showing another embodiment.

FIG. 10 is a diagram (3) corresponding to FIG. 1, showing another embodiment.

FIG. 11 is a voltage standing wave ratio characteristic diagram.

FIG. 12 is a horizontal directional characteristic diagram

[Explanation of symbols]

 C: Case body 11: Fixing material 12: Substrate 13: First conductor 14: Second conductor

Claims (8)

[Claims] A substrate mounted on a surface of the case body via a fixing member; a first conductor mounted on the substrate;
An antenna for a portable communication terminal, comprising: a first conductor and a second conductor electrically paired with the second conductor. 2. The antenna according to claim 1, wherein the fixing member is formed in a hollow shape. 3. The antenna for a portable communication terminal according to claim 1, wherein the second conductor is provided at right angles to the substrate. 4. The antenna for a portable communication terminal according to claim 3, wherein the second conductor is formed in a tongue shape. 5. The antenna according to claim 3, wherein the second conductor is formed in a cylindrical shape. 6. The antenna for a portable communication terminal according to claim 1, wherein the second conductor forms a loop with the first conductor on the substrate. 7. The antenna for a portable communication terminal according to claim 6, wherein the first and second conductors form a folded loop. 8. A portable communication terminal comprising the antenna according to claim 1 provided on a transmitter side of a case main body.