JP3671859B2 - Portable radio - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a portable wireless device, and is particularly suitable for application to a miniaturized device.
[0002]
[Prior art]
Conventionally, as shown in FIG. 11, this type of portable wireless device has a sleeve antenna or a λ / 2, 3λ / 8 or λ / 4 type whip antenna 5 mounted on a metal shield housing 4 incorporating a wireless unit. ing. The sleeve antenna and the λ / 2-type whip antenna have an open impedance because the antenna current distribution is 0 at the lower end of the metal shield case 4, that is, on the opposite side of the antenna grounding portion, and the metal shield case 4 in the radiation pattern. There is almost no influence from the size and length of the.
[0003]
However, since matching with the power feeding side is difficult and the total length of the antenna becomes long, generally a 3λ / 8 or λ / 4 type whip antenna 5 is often used. In these antennas 5, the metal shield housing 4 is also a part of the antenna, so the parameters such as the size and length of the metal shield housing 4 are very important for the performance of the antenna such as the radiation pattern and directivity.
[0004]
In addition, the portable wireless device has a structure in which there is no flip, or there is no part in the flip even if there is a flip, and the flip itself has a sound collecting effect. In a structure where there is practically no flip, the microphone or the like is housed in the metal shield housing 4. Since these lead wires are arranged inside the metal shield housing 4, there is no protrusion from the metal shield housing 4, and only the metal shield housing 4 is captured as the ground plane of the antenna. It did not affect the performance of the antenna such as gender.
[0005]
[Problems to be solved by the invention]
By the way, recent portable wireless devices have been increasingly miniaturized, so that many have a flip structure in consideration of a sound collecting effect and a sense of stability during a call. In addition, there is a configuration in which a microphone, a switch, and various other electronic components are housed in the flip.
[0006]
However, in the portable wireless device in which electronic parts are placed in the flip as described above, when the flip is closed, the ground side of those lead wires is very close to the metal shield housing 4, so that the lead wires The impedance of the lead wire is low and does not affect the antenna performance, but when the flip is opened, the impedance of the lead wire becomes high and becomes part of the ground protruding from the metal shield housing 4.
[0007]
For this reason, the current distribution of the antenna changes, which greatly affects the antenna radiation pattern. In a portable wireless device having a λ / 4, 3λ / 8 system antenna in which the metal shield case 4 is considered as a part of the antenna, a large amount of current flows through the metal shield case 4 as well. There is a problem that the performance of the antenna such as the radiation pattern is affected.
[0008]
The present invention is intended to solve the above-described problems, and it effectively removes the influence on the antenna performance such as the radiation pattern and directivity when the electronic component is arranged in the flip, and whether or not the flip is present. It is an object of the present invention to provide a portable radio that can arbitrarily set antenna directivity and radiation pattern.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, a portable wireless device according to claim 1 of the present invention includes an antenna, a substrate having a ground serving as a ground plane of the antenna, and an inductive or capacitive element provided on the substrate. One end of this element is open, and the other end is connected to an end portion away from the ground antenna installation portion.
[0010]
According to a second aspect of the present invention, there is provided a portable wireless device including an antenna, a substrate having a ground as a ground plate of the antenna, and an inductive pattern formed on the substrate, and one end of the pattern is open. The other end is connected to the end portion away from the ground antenna installation portion.
[0012]
[Action]
A chip part that is open at one end in the ground part of the board if there is a ground part of the board built in the lower part opposite to the antenna installation part in the metal shield case or below the lower part of the metal shield case The antenna directivity and radiation pattern can be set arbitrarily by adjusting the apparent length of the metal shield housing.
[0013]
In addition, the directivity and radiation pattern of the antenna can be arbitrarily set by forming an open-ended inductance below the ground portion of the built-in substrate.
[0015]
【Example】
Hereinafter, reference examples and examples of the present invention will be described in detail with reference to the drawings.
[0016]
Reference Example 1
FIG. 1 shows the appearance of Reference Example 1 of the portable wireless device according to the present invention. In the figure, 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 housing 4 directly or via a substrate, and the length thereof is approximately λ / 2 of the operating frequency (for example, about 17 [when the frequency is 900 [MHz]). cm]). When the operating frequency λ / 2 is longer than the entire length of the flip 1, the microphone lead 3 is twisted and stored as shown in FIG.
[0017]
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, the ground side of the microphone lead wire 3 appears as if it is not connected at the operating frequency. Further, since the microphone lead wire 3 is very close to the metal shield housing 4 in the state where the flip 1 is closed, in the microstrip line, the microphone lead wire is based on the same principle that the impedance of the line is lowered when the distance between the lines is reduced. The impedance of 3 is low. Electrically, this is equivalent to the microphone lead wire 3 being embedded in the metal shield housing 4.
[0018]
Therefore, in the portable wireless device in which the flip 1 having an electronic component such as the microphone 2 attached is attached, even if the flip 1 is opened and closed, the antenna current distribution of the metal shield housing 4 does not change. Thereby, even when the microphone 2 is arranged in the flip 1, the influence on the antenna performance such as the radiation pattern and directivity can be effectively removed. If the design is made without taking this into consideration, when the flip 1 is opened, the antenna radiation pattern is completely different from that when the flip 1 is closed. As a result, the radiation is not performed in a desired direction. Causes a decrease in the incoming / outgoing call rate of the portable radio.
[0019]
According to such a configuration, the length of the ground side of the microphone lead wire 3 of the microphone 2 is set to λ / 2 with respect to the wavelength λ of the operating frequency, and the microphone lead wire viewed from the metal shield housing 4 side. By making the ground side of 3 open, it is possible to effectively eliminate the influence of antenna performance and radiation pattern due to opening and closing of the flip 1.
[0020]
Reference Example 2
FIG. 2 shows an appearance of a portable wireless device according to the second embodiment of the present invention. In the reference example 1 described above, the length of the microphone lead wire 3 is approximately λ / 2 of the wavelength λ of the operating frequency. However, in this reference example 2, in consideration of workability during mass production, By inserting the inductance element 6 between the microphone lead wire 3 and the metal shield housing 4 or the ground portion of the substrate, a state of λ / 2 is created electrically.
[0021]
Even in this case, it is possible to obtain the same effect as in Reference Example 1 described above. In this case, after setting the wiring of the microphone lead wire 3 in the flip 1 to the shortest length in consideration of mass productivity, the microphone By adding the length of the 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 operating frequency, and the manufacturing process is simplified accordingly. And mass productivity can be improved.
[0022]
Reference Example 3.
FIG. 3 shows a flip 1 of the portable wireless device according to the third embodiment of the present invention. In the case of this reference example, the conductive sheet 7 is an independent ground that is in the flip 1 and is not connected anywhere. The impedance on the ground side of the microphone lead wire 3 can be lowered in the same manner as the distance between the lines in the microstrip line is reduced by bringing the ground line side of the microphone lead wire 3 close to the ground.
[0023]
Thus, 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, the antenna performance and the radiation pattern when the flip 1 is opened are not affected. In the case of this method, the frequency characteristics are stronger than those of Reference Example 1 and Reference Example 2 described above, and the method is extremely effective when the transmission / reception frequency band is separated. By obtaining radiation in a desired direction even when flip 1 is opened, the incoming / outgoing call rate of the portable wireless device can be made the same as when flip 1 is closed.
[0024]
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 Reference Example 3 described above, copper, aluminum, or the like is vapor-deposited, or partial plating 8 is applied as shown in FIG. Thereby, the same effect as in Reference Example 3 can be obtained. At this time, it is necessary to make the thickness thicker than the thickness of the skin effect that varies depending on the operating frequency. By this method, it is not necessary to perform the operation of attaching the conductive sheet 7 to the flip 1, and the mass productivity can be improved.
[0025]
Reference Example 5
FIG. 5 shows the lower part of the main body and the flip 1 of the portable wireless device of Reference Example 5 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 Reference Examples 1 to 4 described above, but radiation is performed during a call, that is, with the flip 1 opened. Make sure that the pattern is as unaffected as possible by the human body. In the flip 1, a conductive sheet 7 is attached to the mouth side of the human body, or metal deposition, partial plating 8 or the like is applied, and the ground side of the lead wire 3 of the electronic component is disposed on the opposite side in the flip.
[0026]
Further, by inserting a dielectric 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 λ / 4. As a result, the radio wave radiated from the ground side of the lead wire 3 of the electronic component is reflected by the conductive sheet 7 or the like, and the reflected wave and the direct wave are radiated on the opposite side of the human head and radiated. Can be effectively prevented. Thus, the incoming / outgoing call rate can be improved during a call.
[0027]
In the reference examples 1 to 5 described above, the microphone 2 is disposed inside the flip 1, but the electronic component is not limited to the microphone 2, and various electronic components such as a switch, an antenna, and LED display means are disposed. In short, if the lead wire on the ground side of the electronic component is set to λ / 2 with respect to the wavelength λ of the operating frequency, the same effect as the above-described reference example can be realized.
[0028]
Example 1.
6 and 7 show a portable radio apparatus according to the first embodiment of the present invention. In the first embodiment, the inductance element 6 is attached to the lowermost end 11 of the ground of the substrate 10. At this time, one end of the inductance element 6, that is, the one not connected to the ground bottom end 11 of the substrate 10 is left open. By changing the value of the inductance element 6, the electrical length of the metal shield housing 4 is changed in the increasing direction, and the antenna current distribution is changed.
[0029]
For example, when the antenna 5 is a λ / 4 antenna, the antenna radiation pattern is optimal if the electrical length of the metal shield housing 4 is about λ / 4 of the operating frequency. When the electrical length of the metal shield housing 4 is shorter than λ / 4, this method can be used to obtain an optimum radiation pattern without changing the shape of the metal shield housing 4 or the like. In addition, by increasing the number of attachments, it is possible to increase the specific bandwidth by creating an image in which the entire metal shield housing 4 is lengthened.
[0030]
Example 2
6 and 8 show a portable radio apparatus according to the second embodiment of the present invention. In the second embodiment, a capacitor 16 is attached instead of the inductance element 6 of the first embodiment. By changing the value of the capacitor 16, the electric length of the metal shield housing 4 is changed in the direction of shortening, thereby changing the antenna current distribution.
[0031]
For example, when the antenna 5 is a λ / 4 antenna, the antenna radiation pattern is optimal if the electrical length of the metal shield housing 4 is about λ / 4 of the operating frequency. When the electrical length of the metal shield housing 4 is longer than λ / 4, this method can be used to obtain an optimum radiation pattern without changing the shape of the metal shield housing 4 or the like. In addition, by increasing the number of attachments, an image in which the entire metal shield housing 4 is shortened can be formed, so that the specific bandwidth can be increased as in the first embodiment.
[0032]
Example 3 FIG.
FIG. 9 shows a portable radio apparatus according to the third embodiment of the present invention. In the third embodiment, the same effect can be obtained by forming the pattern inductance 12 at the lowermost end portion 11 of the ground of the substrate, instead of the inductance element 6 of the first embodiment described above. By increasing the number of pattern inductances 12, it is possible to create an image in which the entire metal shield housing 4 is lengthened, so that the ratio band can be increased as in the first embodiment.
[0033]
Example 4
FIG. 10 shows a portable radio apparatus according to the fourth embodiment of the present invention. In the above-described embodiments, the optimum radiation pattern is obtained by changing the electrical length on the ground side of the antenna. However, the same effect can be obtained by changing the antenna side. The built-in antenna 13 adjusts the size and the like of the normal radiation plate to change the resonance frequency. However, in the fourth embodiment, the open-end inductance element 6 is attached to a location 15 away from the feeding point 14 of the radiation plate. The resonance frequency is adjusted by changing the electrical length of the.
[0034]
As a result, the resonance frequency can be adjusted by a simple method with less space than before. If the built-in antenna 13 is obtained by plating a molded product such as a liquid crystal polymer, self-mounting is possible, so that mass productivity can be improved and the resonance frequency can be adjusted remarkably easily.
[0035]
【The invention's effect】
As described above, according to the present invention, when there is a ground portion of a substrate built in a metal shield housing at a lower portion opposite to the antenna installation portion or below the metal shield housing, the substrate By arranging a chip part that is open at one end on the ground part and adjusting the apparent length of the metal shield housing, it is possible to realize a portable radio that can arbitrarily set the antenna directivity and radiation pattern.
[0036]
In addition, according to the following invention, a portable radio that can arbitrarily set the antenna directivity and radiation pattern is realized by forming an open-ended inductance below the ground portion of the built-in substrate. it can.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an overall configuration of Reference Example 1 of a portable wireless device according to the present invention.
FIG. 2 is a schematic perspective view showing an overall configuration of Reference Example 2 of the portable wireless device according to the present invention.
FIG. 3 is a schematic diagram showing a flip configuration of Reference Example 3 of the portable wireless device according to the present invention;
FIG. 4 is a schematic diagram showing a flip configuration of 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 in Reference Example 5 of the portable wireless device according to the present invention;
FIG. 6 is a schematic perspective view showing configurations of first and second embodiments of the portable wireless device according to the present invention.
FIG. 7 is a schematic diagram showing Example 1 of the portable wireless device according to the present invention supplementing FIG. 6;
FIG. 8 is a schematic diagram showing Example 2 of the portable wireless device according to the present invention, supplementing FIG. 6;
FIG. 9 is a schematic perspective view showing an overall configuration of Embodiment 3 of the portable wireless device according to 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 an overall configuration of a conventional portable wireless device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flip 2 Microphone 3 Microphone lead wire 4 Metal shield housing 5 Antenna 6 Inductive element 7 Conductive sheet 8 Partial plating 9 Dielectric 10 Substrate 12 Pattern inductance 13 Built-in antenna 14 Feeding point

Claims (2)

antenna,
A substrate having a ground as a ground plane of the antenna,
Provided with an inductive or capacitive element provided on this substrate,
One end of the element is open, and the other end is connected to an end portion away from the ground antenna installation portion. antenna,
A substrate having a ground as a ground plane of the antenna,
Provided with an inductive pattern formed on this substrate,
One end of this pattern is open, and the other end is connected to an end portion away from the ground antenna installation portion.

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