JP2002009521A - Portable wireless unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable wireless unit that optimizes a radiation of an antenna without changing the size of an antenna main body. SOLUTION: The portable wireless unit is provided with an antenna, a board having a ground plate acting like the ground plate of the antenna, and a capacitive or inductive element provided onto the board, in which one terminal of the element is open and the other terminal of the element is connected to an end apart from an antenna mount section of the ground plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio device, and is particularly suitable for use in a miniaturized radio device.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 11, a portable radio of this type has a metal shield housing in which a sleeve antenna or a λ / 2, 3λ / 8 or λ / 4 system whip antenna 5 has a built-in radio section. It is attached to the body 4. A sleeve antenna or a λ / 2 whip antenna has an open impedance at the lower end of the metal shield case 4, that is, on the opposite side of the antenna grounding portion, because the antenna current distribution is 0, and the radiation pattern is such that the metal shield case 4 It is hardly affected by the size, length, etc.

[0003] However, since matching with the power supply side is difficult and the total length of the antenna is long, generally 3λ is used.
A / 8 or λ / 4 whip antenna 5 is often used. In these antennas 5, the metal shield case 4 is also a part of the antenna, so parameters such as the size and length of the metal shield case 4 are very important for antenna performance such as radiation pattern and directivity.

[0004] In addition, portable radios have a structure in which there is no flip, or even if there is a flip, there are no components in the flip, and the flip itself aims for a sound collecting effect. In a structure having no flip in practice, a microphone or the like is housed in the metal shield case 4. Since these lead wires are arranged inside the metal shield case 4, they do not protrude from the metal shield case 4, and only the metal shield case 4 is taken as the ground plane of the antenna. It did not affect antenna performance, such as sex.

[0005]

By the way, in recent years, many portable radios have a flip structure in consideration of a sound collection effect and a sense of stability during a call due to progress in miniaturization. There is a configuration in which a microphone, a switch, and various other electronic components are stored in the flip.

However, in such a portable radio device in which electronic components are stored in the flip, when the flip is closed, the ground side of those lead wires is
Since it is very close to the metal shield case 4, the impedance of the lead wire is low and does not affect the antenna performance.
When the flip is opened, the impedance of the lead wire increases and becomes part of the ground protruding from the metal shield housing 4.

[0007] Therefore, the current distribution of the antenna changes, which has a great effect on the antenna radiation pattern. In a portable wireless device having a λ / 4, 3λ / 8 antenna that considers the metal shield case 4 as a part of the antenna, a large amount of current also flows through the metal shield case 4, so that the directivity is particularly remarkable. There is a problem that the performance of the antenna such as the radiation pattern and the radiation pattern is affected.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and effectively eliminates the influence on the antenna performance such as a radiation pattern and directivity when an electronic component is arranged in a flip. It is an object of the present invention to provide a portable wireless device capable of arbitrarily setting the directivity and the radiation pattern of an antenna regardless of the presence or absence of the wireless device.

[0009]

According to a first aspect of the present invention, there is provided a portable wireless device, comprising: an antenna; a substrate having a ground serving as a ground plane of the antenna;
An inductive or capacitive element is provided on the substrate, and one end of the element is open, and the other end is connected to an end of the ground remote from the antenna installation portion.

A portable wireless device according to a second aspect of the present invention includes an antenna, a substrate having a ground serving as a ground plane of the antenna, and a pattern formed on the substrate and having an inductive property. It is open and the other end is connected to the end of the ground remote from the antenna installation portion.

According to a third aspect of the present invention, there is provided a portable wireless device having a built-in antenna having a radiation plate, one end of which is open, and the other end connected to an end of the radiation plate remote from a feeder. It has an inductance element.

[0012]

In the metal shield case, one end is opened at the lower portion opposite to the antenna installation portion, or at the ground portion of the board incorporated below the lower portion of the metal shield case, when there is a built-in ground portion. By arranging the chip components and adjusting the apparent length of the metal shield case, the directivity and radiation pattern of the antenna can be set arbitrarily.

Further, by forming an open-ended inductance with a pattern below the ground portion of the built-in board, the directivity and radiation pattern of the antenna can be set arbitrarily.

Further, by disposing the one-end open inductance element on the end face of the planar antenna, the resonance frequency can be adjusted by a smaller space and a simpler method than before.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a first embodiment of the present invention;

Reference Example 1 FIG. 1 shows an appearance of a first embodiment of a portable wireless device according to the present invention. In FIG. 1, reference numeral 1 denotes a flip made of a dielectric such as ABS resin, and the microphone 2 is housed in the flip. The ground side of the microphone lead wire 3 is connected to the metal shield case 4 directly or via a substrate, and its length is approximately λ / 2 of the operating frequency.
(For example, when the frequency is 900 [MHz], about 17 [cm])
Is set to When the use frequency λ / 2 is longer than the total length of the flip 1, the microphone lead wire 3 is stored in a winding manner as shown in FIG.

At this time, when the ground side of the microphone lead wire 3 is viewed from the metal shield housing 4 side, the current distribution at that location is minimized and the impedance is open. That is, when the flip 1 is opened, it appears as if the ground side of the microphone lead wire 3 is not connected at the operating frequency. When the flip 1 is closed, the microphone lead wire 3 is very close to the metal shield case 4, so that the
When the distance between the lines is reduced, the impedance of the microphone lead wire 3 is reduced on the same principle as the impedance of the line is reduced. It is electrically equivalent to the microphone lead wire 3 being embedded in the metal shield case 4.

Therefore, in a portable wireless device in which a flip 1 in which electronic components such as a microphone 2 are arranged is mounted,
Even when the flip 1 is opened and closed, no change occurs in the antenna current distribution of the metal shield case 4. Thereby, even when the microphone 2 is arranged in the flip 1, it is possible to effectively remove the influence on the antenna performance such as the radiation pattern and the directivity.
If the design is made without considering this, the flip 1
When the antenna is opened, it has a radiation pattern completely different from the antenna radiation pattern when the antenna is closed, and the radiation is not performed in the desired direction. Become.

According to such a configuration, the length of the microphone lead wire 3 of the microphone 2 on the ground side is set to λ / 2 with respect to the wavelength λ of the operating frequency, and viewed from the metal shield housing 4 side. By setting the ground side of the microphone lead wire 3 to the open state, the influence of the antenna performance and the radiation pattern due to the opening and closing of the flip 1 can be effectively removed.

Reference Example 2 FIG. 2 shows an appearance of a portable wireless device of a second embodiment according to the present invention. In the above-described reference example 1, the length of the microphone lead wire 3 is substantially equal to λ / 2
However, in this reference example 2, in consideration of workability during mass production, the middle of the microphone lead 3 or the microphone lead 3
By inserting the inductance element 6 between the metal shield housing 4 and the ground portion of the substrate, an electrically λ / 2 state is created.

In this case, the same effect as in the first embodiment can be obtained. In this case, the length of the microphone lead wire 3 in the flip 1 is set to the shortest length in consideration of mass productivity. Thereafter, by adding the length of the microphone lead wire 3 and the equivalent length of the inductance element 6, the specifications of the inductance element 6 can be determined so as to be λ / 2 with respect to the wavelength λ of the used frequency. Can be simplified and mass productivity can be improved.

Reference Example 3 FIG. 3 shows a flip 1 of a portable wireless device according to a third embodiment of the present invention. In the case of this reference example, the conductive sheet 7 is an independent ground which is not connected anywhere in the flip 1. By bringing the ground line side of the microphone lead wire 3 closer to the ground, the impedance on the ground side of the microphone lead wire 3 can be reduced, as in the case of shortening the distance between the lines in the microstrip line.

Accordingly, even if the ground side of the microphone lead wire 3 is shorter than λ / 2 with respect to the wavelength λ of the operating frequency,
It does not affect the antenna performance and radiation pattern when the flip 1 is opened. In the case of this method, the above-mentioned reference example 1
It has a stronger frequency characteristic than that of Reference Example 2, and is extremely effective when the transmission and reception frequency bands are far apart. Even if the flip 1 is opened, by obtaining radiation in a desired direction, the calling rate of the portable wireless device can be made the same as when the flip 1 is closed.

Reference Example 4 FIG. 4 shows a flip 1 of a portable wireless device according to a fourth embodiment of the present invention. In this reference example, instead of the conductive sheet 7 in the above-described reference example 3, copper, aluminum or the like is metal-deposited, or partial plating 8 is applied as shown in FIG. Thereby, the same effect as in the third embodiment can be obtained. At this time, the thickness needs to be larger than the thickness of the skin effect that differs depending on the frequency used. With this method, the work of attaching the conductive sheet 7 to the flip 1 is not required, and the mass productivity can be improved.

Reference Example 5 FIG. 5 shows the lower part of the main body and the flip 1 of the portable wireless device of the fifth embodiment according to the present invention. In this embodiment, the antenna performance and the radiation pattern are not affected when the flip 1 is opened and closed as in the above-described first to fourth embodiments.
The radiation pattern in the open state should be a pattern that is as little affected by the human body as possible. The conductive sheet 7 is attached to the mouth side of the human body in the flip 1 or metal plating or partial plating 8 is performed, and the ground side of the lead wire 3 of the electronic component is arranged on the opposite side of the flip.

Further, by inserting a dielectric material 9 having a high dielectric constant between the conductive sheet 7 and the lead wire 3 of the electronic component, the electrical distance between them is set to λ / 4. This allows
The electric wave radiated from the ground side of the lead wire 3 of the electronic component is reflected by the conductive sheet 7 and the like, and the reflected wave and the direct wave are radiated to the opposite side of the head of the person while being strengthened and absorbed by the human body and the head. Can be effectively prevented. Thus, the outgoing / incoming call rate can be improved during a call.

In the first to fifth embodiments, the flip 1
Although the microphone 2 is disposed inside, the electronic components are not limited to the microphone 2 and various electronic components such as switches, antennas, and LED display means may be disposed. If the line is set to λ / 2 with respect to the wavelength λ of the working frequency, the same effect as in the above-described reference example can be realized.

Embodiment 1 FIG. 6 and 7 show a portable wireless device according to a first embodiment of the present invention. In the first embodiment, the inductance element 6 is provided at the lowermost end 11 of the ground of the substrate 10.
Install. At this time, one end of the inductance element 6, that is, the one not connected to the lowermost ground end portion 11 of the substrate 10, is left open. By changing the value of the inductance element 6, the electrical length of the metal shield case 4 is changed in a direction in which the metal shield case 4 becomes longer, and the antenna current distribution is changed.

For example, when the antenna 5 is a λ / 4 antenna, the electrical length of the metal shield case 4 is also about λ /
If it is 4, the antenna radiation pattern will be optimal. When the electrical length of the metal shield case 4 is shorter than λ / 4, by using this method, an optimum radiation pattern can be obtained without changing the shape of the metal shield case 4 or the like. In addition, by increasing the number of attachments, it is possible to obtain an image in which the entire length of the metal shield housing 4 is lengthened, thereby increasing the specific bandwidth.

Embodiment 2 FIG. 6 and 8 show a portable wireless device according to a second embodiment of the present invention. In the second embodiment, a capacitor 16 is mounted instead of the inductance element 6 of the first embodiment. By changing the value of the capacitor 16, the electrical length of the metal shield case 4 is changed in the direction of shortening, and the antenna current distribution is changed.

For example, when the antenna 5 is a λ / 4 antenna, the electrical length of the metal shield case 4 is also about λ /
If it is 4, the antenna radiation pattern will be optimal. When the electrical length of the metal shield case 4 is longer than λ / 4, by using this method, an optimum radiation pattern can be obtained without changing the shape of the metal shield case 4 or the like. It is to be noted that, by increasing the number to be attached, an image in which the entire length of the metal shield housing 4 is shortened can be obtained, so that the fractional band can be increased similarly to the first embodiment.

Embodiment 3 FIG. Third Embodiment FIG. 9 shows a portable wireless device according to a third embodiment of the present invention. In the third embodiment, the same effect can be obtained by forming the pattern element 12 in the lowermost end portion 11 of the ground of the substrate instead of using the inductance element 6 of the first embodiment as a component. By increasing the number of pattern inductances 12, it is possible to obtain an image in which the entire length of the metal shield case 4 is increased.
The fractional band can be increased in the same manner as in the first embodiment.

Embodiment 4 FIG. FIG. 10 shows a portable wireless device according to a fourth embodiment of the present invention. In the above embodiment, the optimum radiation pattern is obtained by changing the electrical length of the antenna on the ground side, but the same effect can be obtained by changing the antenna side. The built-in antenna 13 usually changes the resonance frequency by adjusting the size and the like of the radiation plate. In the fourth embodiment, however, the antenna 15 is provided by mounting the one-end open inductance element 6 at a position 15 away from the feed point 14 of the radiation plate. Is adjusted to adjust the resonance frequency.

Thus, the resonance frequency can be adjusted in a smaller space and with a simple method than before. If the built-in antenna 13 is formed by plating a molded product such as a liquid crystal polymer, the antenna can be mounted on its own, so that the mass productivity can be improved and the adjustment of the resonance frequency can be performed much easier.

[0035]

As described above, according to the present invention, there is a ground portion of the board built in the metal shield housing at the lower portion opposite to the antenna installation portion or below the lower portion of the metal shield housing. In this case, a portable wireless device that can set the directivity and radiation pattern of the antenna arbitrarily by arranging a chip part with one end open on the ground part of the board and adjusting the apparent length of the metal shield case Machine can be realized.

According to the next invention, a one-side open inductance is formed by a pattern below a ground portion of a built-in substrate, so that the directivity and the radiation pattern of the antenna can be arbitrarily set. Machine can be realized.

Further, according to the next invention, a portable wireless device capable of adjusting the resonance frequency in a smaller space and with a simpler method than before is realized by arranging the one-end open inductance element on the end face of the planar antenna. it can.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an overall configuration of a first embodiment of a portable wireless device according to the present invention.

FIG. 2 is a schematic perspective view showing the entire configuration of a second embodiment of the portable wireless device according to the present invention.

FIG. 3 is a schematic diagram illustrating a configuration of a flip according to a reference example 3 of the portable wireless device according to the present invention.

FIG. 4 is a schematic diagram illustrating a configuration of a flip according to a reference example 4 of the portable wireless device according to the present invention.

FIG. 5 is a cross-sectional view showing a configuration around a flip of a fifth embodiment of the portable wireless device according to the present invention.

FIG. 6 is a diagram illustrating a portable wireless device according to first and second embodiments of the present invention;
It is a schematic perspective view which shows the structure of.

FIG. 7 is a schematic diagram supplementing FIG. 6 and showing the first embodiment of the portable wireless device according to the present invention;

FIG. 8 is a schematic diagram supplementing FIG. 6 and showing a second embodiment of the portable wireless device according to the present invention;

FIG. 9 is a schematic perspective view showing an overall configuration of a portable wireless device according to a third embodiment of the present invention.

FIG. 10 is a schematic perspective view showing an overall configuration of a portable wireless device according to a fourth embodiment of the present invention.

FIG. 11 is a schematic perspective view showing the entire configuration of a conventional portable wireless device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flip 2 Microphone 3 Microphone lead wire 4 Metal shield case 5 Antenna 6 Inductance element 7 Conductive sheet 8 Partial plating 9 Dielectric 10 Substrate 12 Pattern inductance 13 Built-in antenna 14 Feeding point

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koichi Taketomi 1-1-1 Tsukaguchi Honcho, Amagasaki-shi F-term (reference) 5J047 AA01 AA02 AA04 AB06 FD01 5K011 AA03 DA02 GA03 JA01 KA13 5K023 AA07 BB06 BB28 DD08 LL05 LL06

Claims (3)

[Claims] An antenna, a substrate having a ground serving as a ground plane of the antenna, an inductive or capacitive element provided on the substrate, one end of the element being open, and the other end being connected to the ground. A portable wireless device connected to an end remote from an antenna installation portion. 2. An antenna, a board having a ground serving as a ground plane of the antenna, an inductive pattern formed on the board, one end of the pattern being open, and the other end being an antenna installation part of the ground A portable wireless device connected to an end remote from the mobile terminal. 3. A portable wireless device comprising: a built-in antenna having a radiation plate; one end being open, and the other end being provided with an inductance element connected to an end of the radiation plate remote from a feeder. .