JP4053418B2 - Antenna device and mobile phone - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antenna device mounted on a mobile radio apparatus such as a mobile TV terminal and a mobile phone terminal.
[0002]
[Prior art]
As an antenna device mounted on a conventional wireless device, two elongated helical coil elements and a substrate are installed inside a casing, and the two helical coil elements are respectively attached to the upper part inside the casing. There is a structure in which it is installed at an angle and its end is fixed to a substrate (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-138513
[Problems to be solved by the invention]
Since the conventional antenna device is configured as described above, it is necessary to separately install a helical coil element (radiating element) dedicated to the antenna in addition to the circuit board in the housing. Installation becomes difficult depending on conditions. In addition, it becomes difficult to reduce the size of the entire casing, and costs increase. Furthermore, the antenna device becomes physically large when it is used at a low frequency. For this reason, there are problems such as narrowing of the frequency characteristics and deterioration of the radiation efficiency with the miniaturization when the antenna device is built in the housing.
[0005]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an antenna device that can be reduced in size, widened in frequency characteristics, and improved in various characteristics when used at a low frequency.
[0006]
[Means for Solving the Problems]
An antenna device according to the present invention is an antenna device mounted on a wireless device, wherein a second housing coupled to the first housing, a third housing coupled to the second housing, and the first housing side A first conductor installed on the second housing side, the second conductor constituting the first conductor and the antenna, and a third conductor installed on the third housing side, the first conductor and The high frequency voltage is supplied to the second conductor .
In addition, the antenna device and the mobile phone according to the present invention include a second housing coupled to the first housing, a first conductor installed on the first housing side, a first conductor installed on the second housing side, A conductor and a second conductor constituting an antenna, comprising a plurality of conductive wires, a conductive wire bundle for supplying a high-frequency voltage to the first conductor and the second conductor, and disposed in parallel with the conductive wire bundle, Electrically connected to the second conductor and having a conductive wire with an inductive or capacitive load connected in series. The first conductor and the second conductor are metal members existing in the apparatus. It is comprised as follows.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 is a front view showing an antenna device mounted on a wireless device according to Embodiment 1 of the present invention. In FIG. 1, a first conductor plate 1 is installed inside a first dielectric housing 6 and The two-conductor plate 2 is installed inside the second dielectric housing 7, and the first conductor plate 1 and the second conductor plate 2 are both circuit boards of the radio apparatus. The first conductor plate 1 is disposed on the upper side when the wireless device is used, and a speaker, a display, and the like (not shown) are disposed on the first conductor plate 1. The second conductor plate 2 is disposed on the lower side when the wireless device is used, and an RF circuit, a battery, a microphone, a keyboard, and the like (not shown) are disposed on the second conductor plate 2. The wireless device is configured by connecting the first dielectric housing 6 and the second dielectric housing 7 by an openable / closable mechanism not shown. The high frequency power source 5 is in the second dielectric housing 7 and applies a high frequency voltage to the first conductor plate 1 and the second conductive plate 2.
In the wireless device configured as described above, wiring for operating the display and the speaker is mainly required between the first conductor plate 1 and the second conductor plate 2. The conductive wire bundle 3 is configured by bundling these wires. The conductive wire bundle 3 is connected to the first conductor plate 1 and the second conductor plate 2 by a connector 4. The connector 4 has a capacitor element (not shown), and the wiring in the conductive wire bundle 3 is short-circuited with the first conductor plate 1 and the second conductor plate 2 via the capacitor element in the connector 4. The capacitive element operates to prevent a high-frequency current flowing on each wiring of the conductive wire bundle 3 from flowing into a circuit on the first conductor plate 1 and the second conductor plate 2, and the conductive wire bundle 3 is a first conductor only at a high frequency. The plate 1 and the second conductor plate 2 are short-circuited. Usually, the number of wires in the conductive wire bundle 3 is about 40 to 80. The dielectric spacer 8 is located between the conductive wire bundle 3 and the second conductor plate 2, and keeps the distance between the conductive wire bundle 3 and the second conductor plate 2 uniform on the second conductor plate 2. The conductive wire 9 is arranged in parallel with the conductive wire bundle 3 and electrically connects the first conductor plate 1 and the second conductor plate 2. The conductive wire 9 is connected to an inductive or capacitive load not shown in series.
[0008]
Next, the operation will be described.
This antenna device operates as a dipole antenna composed of a first conductor plate 1, a second conductor plate 2 and a high frequency power source 5. In this antenna device, since the first conductor plate 1 and the second conductor plate 2 that are circuit boards are used as radiation elements as they are, the radiation elements are separately installed like the antenna apparatus mounted on the conventional radio apparatus. Therefore, the wireless device can be miniaturized. Further, this antenna device has a wider frequency characteristic than a conventional antenna device in which a separate radiating element is separately installed. This is because the dipole antenna has a characteristic that the band expands with the thickness and width, so that the circuit board can be directly used as a radiating element as in this antenna device to become a dipole antenna having a wide radiating element. .
[0009]
In order not to affect various characteristics of the dipole antenna, it is necessary to sufficiently increase the impedance of the conductive wire bundle 3 connecting the first conductor plate 1 and the second conductor plate 2 in the operating frequency band. Ideally ∞Ω. Therefore, a dielectric spacer 8 is inserted between the second conductor plate 2 and the conductive wire bundle 3 to keep the second conductor plate 2 and the conductive wire bundle 3 at a uniform interval and make the connector 4 of the conductive wire bundle 3 uniform. If the wavelength (electric length) of the center frequency of the operating frequency band is λ, the length 1 from the end of the second conductor plate 2 to the end face of the second conductor plate 2 is about λ / 4. Shorted at high frequency. That is, a terminal short-circuit microstrip line having a length of 1 may be formed. The impedance of the conductive wire bundle 3 can be increased by setting l to an electrical length of about λ / 4.
[0010]
Moreover, you may provide between the 1st conductor board 1 and the 2nd conductor board 2 the conductive wire 9 which connects them electrically. An inductive or capacitive load is connected in series to the conductive wire 9, and the high-frequency current phase flowing on the first conductor plate 1 and the second conductor plate 2 can be changed. Thereby, a radiation pattern can be changed and it can be used as a diversity antenna. Further, when a person uses a wireless terminal, the influence of electromagnetic waves on the human body can be suppressed by changing the radiation pattern so that a weak electric field is generated in the direction of the human body.
Although FIG. 1 shows the first dielectric housing 6 provided with the second dielectric housing 7 so as to be foldable, the second dielectric housing 7 is provided on the first dielectric housing 6. It may be provided so as to be slidable.
Moreover, although what showed the terminal short-circuit microstrip line for the length l on the 2nd conductor board 2 was shown, you may form the terminal short-circuit microstrip line for the length l in the 1st conductor board. .
[0011]
Embodiment 2. FIG.
FIG. 2 is a front view showing an antenna device mounted on a radio apparatus according to Embodiment 2 of the present invention, and FIGS. 3 to 5 are side views showing various forms of the antenna device. A third dielectric housing 11 is provided below the body 7, and a third conductor plate 10 is provided inside the third dielectric housing 11. The third conductor plate 10 is electrically connected to the second conductor plate 2 via the joint 12, and the joint 12 includes the second dielectric housing 11 as shown in FIGS. 3 to 5. This is a connection mechanism that can be opened and closed with respect to the dielectric casing 7. Although not shown in FIGS. 3 to 5, the first conductor plate 1, the second conductor plate 2, and the third conductor plate 10 are a first dielectric housing 6 and a second dielectric housing 7, respectively. The third dielectric housing 11 is covered. 2 and 3, the joint 12 has a position where the third conductor plate 10 is approximately 180 ° relative to the second conductor plate 2, a position 90 ° as shown in FIG. 4, and a position 0 ° as shown in FIG. It has a structure that can be fixed respectively.
Other configurations are the same as those of the antenna device shown in FIG.
[0012]
Next, the operation will be described.
3 is compared with the antenna device shown in FIG. 1 of the first embodiment, since the third conductor plate 10 is electrically connected to the second conductor plate 2, and therefore, compared with the dipole antenna of the first embodiment. The length becomes longer, the resonance frequency shifts to a frequency lower than that of the antenna device of the first embodiment, and can be used at a frequency lower than that of the antenna device of the first embodiment.
Further, as shown in FIG. 4, the second dielectric casing 7 and the third dielectric casing 11 are connected to each other with the joint 12 while the third conductor plate 10 is electrically connected to the second conductor plate 2. It is possible to provide a function as a fixed base capable of allowing the wireless device to stand on its own. Since the human body is electrically composed of a lossy body, the radiation efficiency of the antenna device deteriorates when held by the human body. For example, when the wireless device has a TV viewing function or the like and the usage purpose is limited to unilateral reception, it contributes to prevention of deterioration of radiation efficiency. Note that even in the state of FIG. 4, it can be used at a low frequency as in the state of FIG. FIG. 5 shows a state in which the third dielectric housing 11 including the third conductor plate 10 is housed, and the entire wireless device is made compact, so that the aesthetic appearance is improved and the portability is excellent.
2 to 5, the first dielectric housing 6, the second dielectric housing 7, and the third dielectric housing 11 are provided so as to be foldable. The body 6, the second dielectric housing 7 and the third dielectric housing 11 may be provided so as to be slidable.
[0013]
Embodiment 3 FIG.
FIG. 6 is a front view showing an antenna device mounted on a radio apparatus according to Embodiment 3 of the present invention. In the figure, the third conductor plate 13 is formed in a meander shape having a plurality of slits 13a. is there. The physical dimension of the third conductor plate 13 is equal to or smaller than the second conductor plate 2.
Other configurations are the same as those of the antenna device shown in FIG.
[0014]
Next, the operation will be described.
The radiation of the dipole antenna is contributed to the current flowing in the longitudinal direction of the dipole. In the third embodiment, the third conductor plate 13 has a meander shape in order to increase the electrical length in the longitudinal direction of the dipole in a limited antenna installation space. By adopting a meander structure in which the slits 13a are inserted in the short direction of the dipole antenna, it is possible to increase the electrical length with respect to the longitudinal direction of the dipole antenna while reducing the physical space.
In FIG. 6, the third conductor plate 13 has a meander structure in which the slit 13a is inserted. However, a slot may be inserted, and the electrical length with respect to the longitudinal direction of the dipole antenna can be increased while the physical space is similarly reduced. It becomes possible.
[0015]
Embodiment 4 FIG.
7 and 8 are side views showing various forms of the antenna device mounted on the wireless device according to the fourth embodiment of the present invention. Although not shown, the first conductor plate 1, the second conductor plate 2, The third conductor plates 13 are respectively covered with the first dielectric housing 6, the second dielectric housing 7, and the third dielectric housing 11, and the second dielectric housing 11 is covered with the second dielectric housing 11. The housing 7 has a mechanism that enables sliding movement in a substantially parallel manner.
7 shows the third dielectric housing 11 in the housed state, and FIG. 8 shows the third dielectric housing 11 in the unfolded state. The portion different from the antenna device shown in FIG. 5 of the second embodiment is that, in FIG. 5, the second conductor plate 2 and the third conductor plate 10 are electrically connected by the joint 12 when the third dielectric housing 11 is housed. In FIG. 7, the second conductor plate 2 and the third conductor plate 13 are electrically connected by the dissociation of the joints 14 and 15 in the storage state of the third dielectric housing 11 in FIG. There is no point. In the developed state of FIG. 8, the second conductor plate 2 and the third conductor plate 13 are electrically connected by the connection of the joints 14 and 15.
[0016]
Next, the operation will be described.
In the housed state shown in FIG. 7, the third conductor plate 13 is arranged substantially parallel to the first conductor plate 1 and the second conductor plate 2, so that the second conductor plate 2 and the third conductor plate 13 The third conductor plate 13 operates as a non-excited element by adjusting the interval of. For this reason, in addition to the effect of the second embodiment, there is an advantage that broadband characteristics can be obtained in a state where the third conductor plate 13 is housed. Further, the unfolded state of FIG. 8 is the same as that of the second embodiment.
[0017]
Note that the third conductor plate 13 may be plate-shaped as in the second embodiment or meander-shaped as in the third embodiment.
7 and 8, the first dielectric housing 6 and the second dielectric housing 7 are foldable, and the second dielectric housing 7 and the third dielectric housing 11 are slidably provided. However, each connecting portion may be foldable or slidable.
Furthermore, in the antenna device shown in the first to fourth embodiments, if the lengths in the longitudinal direction of the first conductor plate 1 and the second conductor plate 2 are set to λ / 4 of the use frequency band, The one conductor plate 1 and the second conductor plate 2 can form a dipole antenna having a frequency of about λ / 2, and an ideal and efficient dipole antenna can be formed. In addition, as shown in FIGS. 2, 3, 6, and 8, a third dielectric housing is used for the dipole antenna of about λ / 2 formed by the first conductor plate 1 and the second conductor plate 2. When the third conductor plate 10 is electrically connected to the second conductor plate 2 in a deployed state 11, an efficient dipole antenna that can be used even at a low frequency can be configured.
[0018]
【The invention's effect】
As described above, according to the present invention, in the antenna device mounted on the wireless device, the second housing coupled to the first housing, the third housing coupled to the second housing, A first conductor installed on one housing side, a second conductor installed on the second housing side and constituting the first conductor and the antenna, and a third conductor installed on the third housing side, Since a high frequency voltage is supplied to one conductor and a second conductor, a dipole antenna is configured by a first conductor plate, a second conductor plate , a third conductor plate, and a high frequency power source, which is compared with a conventional antenna device. As a result, the frequency characteristics can be broadened and the first and second conductor plates, which are circuit boards, can be used as radiating elements as they are. There is no need to There is an effect that can be of.
In addition, the antenna length is increased, and there is an effect that the antenna can be used at a lower frequency.
Further, according to the present invention, in the antenna device and the mobile phone, the second casing coupled to the first casing, the first conductor installed on the first casing side, and the second casing side are installed. A first conductor and a second conductor constituting an antenna, and a plurality of conductive wires; a conductive wire bundle that feeds a high-frequency voltage to the first conductor and the second conductor; Electrically connecting the conductor and the second conductor, and having a conductive wire with an inductive or capacitive load connected in series, the first conductor and the second conductor are metal members existing in the device By configuring the dipole antenna with a high-frequency power supply, the frequency characteristics can be broadened compared to the conventional antenna device, and the first conductor plate and the second conductor, which are circuit boards, can be obtained. The plate as a radiating element Can be utilized, it is not necessary to install a radiating element as in the conventional antenna device, there is an effect that can be miniaturized radio apparatus.
Further, since the phase of the high-frequency current flowing on the first conductor plate 1 and the second conductor plate 2 can be changed, the radiation pattern can be changed, and there is an effect that it can be used as a diversity antenna.
In addition, when a person uses a wireless terminal, there is an effect that the influence of electromagnetic waves on the human body can be suppressed by changing the radiation pattern so that a weak electric field is generated in the human body direction.
[Brief description of the drawings]
FIG. 1 is a front view showing an antenna device mounted on a wireless device according to Embodiment 1 of the present invention;
FIG. 2 is a front view showing an antenna device mounted on a wireless device according to a second embodiment of the present invention.
FIG. 3 is a side view showing various forms of the antenna device.
FIG. 4 is a side view showing various forms of the antenna device.
FIG. 5 is a side view showing various forms of the antenna device.
FIG. 6 is a front view showing an antenna device mounted on a wireless device according to a third embodiment of the present invention.
FIG. 7 is a side view showing various forms of an antenna device mounted on a wireless device according to Embodiment 4 of the present invention.
FIG. 8 is a side view showing various forms of an antenna device mounted on a wireless device according to Embodiment 4 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st conductor plate, 2nd conductor plate, 3 Conductive wire bundle, 4 Connector, 5 High frequency power supply, 6 1st dielectric housing, 7 2nd dielectric housing, 8 Dielectric spacer, 9 Conductive wire, 10, 13 3rd conductor board, 11 3rd dielectric housing | casing, 12, 14, 15 joint, 13a Slit.

Claims (8)

In an antenna device mounted on a wireless device,
A second housing coupled to the first housing;
A third housing coupled to the second housing;
A first conductor installed on the first housing side;
A second conductor installed on the second housing side and constituting the antenna with the first conductor;
Having a third conductor installed on the third housing side,
A high frequency voltage is fed to the first conductor and the second conductor. In an antenna device mounted on a wireless device,
A second housing coupled to the first housing;
A third housing coupled to the second housing and configured to be foldable or slidable;
A first conductor installed on the first housing side;
A second conductor installed on the second housing side and constituting the antenna with the first conductor;
A third conductor installed on the third housing side, disposed substantially parallel to the second conductor when housed in the second housing, and electrically disconnected from the second conductor. And
A high frequency voltage is fed to the first conductor and the second conductor.   4. The antenna device according to claim 2, wherein the second housing and the third housing are fixed at desired positions.   The antenna device according to claim 2, wherein the third conductor has a meander shape.   The antenna device according to any one of claims 2 to 4, wherein the third conductor has one or a plurality of slots.   The antenna device according to any one of claims 2 to 4, wherein the third conductor has one or a plurality of slits. In an antenna device mounted on a wireless device,
A second housing coupled to the first housing;
A first conductor installed on the first housing side;
A second conductor installed on the second housing side and constituting the antenna with the first conductor;
A conductive wire bundle comprising a plurality of conductive wires and supplying a high-frequency voltage to the first conductor and the second conductor;
A conductive wire that is arranged in parallel with the conductive wire bundle, electrically connects the first conductor and the second conductor, and has an inductive or capacitive load connected in series,
The antenna device according to claim 1, wherein the first conductor and the second conductor are metal members existing in the device. A second housing coupled to the first housing;
A first conductor installed on the first housing side;
A second conductor installed on the second housing side and constituting the antenna with the first conductor;
A conductive wire bundle comprising a plurality of conductive wires and supplying a high-frequency voltage to the first conductor and the second conductor;
A conductive wire that is arranged in parallel with the conductive wire bundle, electrically connects the first conductor and the second conductor, and has an inductive or capacitive load connected in series,
The mobile phone, wherein the first conductor and the second conductor are metal members existing in the apparatus.

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