JP2001053522A - Antenna system and portable radio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid deterioration of a speaking quality by providing an unbalanced transmission line and a balance and unbalance converting means between first, second and third antenna elements to feed power to the first and second antenna elements at pushing in of the first, second and third antenna elements and to feed power to the second and third antenna elements at the time of drawing out. SOLUTION: A second power feeding material 59 is connected to the lower end of a rod antenna 54, and the material 59 is mechanically connected with a first connecting part 58. A first helical antenna 55, the rod antenna 54 and the second helical antenna 56 are successively connected in a line, in the state of separating them from each other. At the time of pushing in and drawing out of an antenna part 53, the antenna 54, the first or second helical antennas 55 or 56 is selectively connected electrically to first and second antenna power feeding terminals 65 and 66. A leaked current from an unbalanced transmission line 32 prevents a shield case from operating as an antenna.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device and a portable wireless device, and is suitably applied to, for example, a portable telephone.

[0002]

2. Description of the Related Art Conventionally, in this type of portable telephone,
The size and weight have been reduced to improve portability. Along with this, whip antenna type antenna devices provided in mobile phones have been actively developed,
As this type of mobile phone, there is a mobile phone configured as shown in FIGS.

In the portable telephone 1 having such a configuration, a whip antenna type antenna device 3 is provided in a housing case 2 made of a non-conductive material such as a synthetic resin.

The antenna device 3 has an antenna unit 6 provided with a rod antenna 4 made of a conductive rod-shaped wire and a helical antenna 5 formed by spirally winding a conductive wire. The direction in which the antenna section 6 is pushed into the inside of the housing case 2 indicated by an arrow a at the upper end 2A of the housing case 2 (hereinafter referred to as the pushing direction) and the opposite direction of the housing case 2 Direction from the inside to the outside (hereinafter referred to as the drawing direction)
Are provided so as to be able to be pushed in and pulled out along the line.

In the antenna section 6, a first feeding member 7 made of a conductive material and having a projection 7A is electrically and mechanically connected to the lower end of the rod antenna 4, and is connected to the upper end of the rod antenna 4. A connection portion 8 made of a non-conductive material is mechanically connected.

A second power supply member 9 made of a conductive material is electrically and mechanically connected to the lower end of the helical antenna 5, and the second power supply member 9 is mechanically connected to the connection portion 8. I have. Thus, in the antenna section 6, the lot antenna 4 and the helical antenna 5 are mechanically connected by the connection section 8, but are electrically separated.

The rod antenna 4 is covered with a rod antenna cover 10 and the helical antenna 5 is formed as a cap-shaped helical antenna cover 11.
It is stored so that it does not directly touch the human body.

On the other hand, a circuit board (not shown) on which various circuit elements such as a transmission / reception circuit 12 and a matching circuit 13 are mounted, and a ground member made of a conductive material which covers the circuit board are provided inside the housing case 2. And a shield case (not shown).

An antenna feed terminal 14 made of a conductive material electrically connected to the matching circuit 13 is provided inside the upper end 2A of the housing case 2. When the antenna unit 6 is pushed in and pulled out, the antenna feed terminal 14 is provided. 14 is electrically connected to only one of the rod antenna 4 and the helical antenna 5.

In practice, in the antenna device 3, when the antenna section 6 is pushed in, the helical antenna cover 11
Is pushed in the pushing direction and hits the upper end 2 </ b> A of the housing case 2, the rod antenna 4 is inserted into the housing case 2.
Is pushed in and stored, and at this time, the second power supply member 9 is electrically connected to the antenna power supply terminal 14.

In the antenna device 3, the transmitting / receiving circuit 12, the matching circuit 13, the antenna feed terminal 14
And the helical antenna 5 via the second power feeding member 9 sequentially.
Helical antenna 5 is operated as an antenna.

At this time, in the antenna device 3, the rod antenna 4 is electrically separated from the antenna feed terminal 14 by the connecting portion 8 so as not to operate as an antenna.

On the other hand, in the antenna device 3,
When the antenna unit 6 is pulled out, the second antenna cover 1 is held in a state where the rod antenna 4 is housed inside the housing case 2.
When the pin antenna 1 is pinched and pulled in the pull-out direction, the rod antenna 4 is pulled out from the upper end 2A of the housing case 2 and the projection 7A of the first power supply member 7 is abutted against the antenna power supply terminal 14. Thereby, the first power supply member 7 is electrically connected to the antenna power supply terminal 14.

In the antenna device 3, the transmitting and receiving circuit 12, the matching circuit 13, the antenna feed terminal 14
The rod antenna 4 is operated as an antenna by being sequentially fed to the rod antenna 4 via the first feeding member 7.

At this time, in the antenna device 3, the helical antenna 5 is electrically separated from the antenna feed terminal 14 by the connecting portion 8 so as not to operate as an antenna.

Incidentally, when the rod antenna 4 and the helical antenna 5 are each operated as an antenna,
The matching circuit 13 matches the impedance of the rod antenna 4 and the helical antenna 5 with the unbalanced transmission line 16.

The shield case functions as a ground for various circuit elements, and also prevents external noise radio waves and radio waves radiated from the antenna unit 6 from entering the various circuit elements mounted on the circuit board. It also functions as an electrical shield.

As a result, in this portable telephone 1,
When the antenna section 6 is pulled out, the rod antenna 4 is pulled out from the housing case 2, and a transmission signal composed of a high-frequency signal is transmitted from the transmission / reception circuit 12 to the rod antenna 4 via the matching circuit 13, and is transmitted through the rod antenna 4. And transmits a transmission signal to a base station (not shown), and a reception signal composed of a high-frequency signal transmitted from the base station and received by the rod antenna 4 via a matching circuit 13.
Can be sent to

In the portable telephone 1, when the antenna section 6 is pushed in, the rod antenna 4 is housed inside the housing case 2 to prevent the portability from being impaired.
In this state, a transmission signal is transmitted from the transmission / reception circuit 12 to the helical antenna 5 via the matching circuit 13, and the transmission signal is transmitted to the base station via the helical antenna 5 and transmitted from the base station. Thus, the received signal can be transmitted to the transmission / reception circuit 12 via the matching circuit 13.

[0020]

The portable telephone 1 having such a configuration has an unbalanced transmission line 15 formed of, for example, a microstrip line formed on a circuit board. , And the rod antenna 4 or the helical antenna 5 are electrically connected via the matching circuit 13 in order, and the ground side of the unbalanced transmission line 15 is grounded to the shield case.

Therefore, in this portable telephone 1, FIG.
As shown in FIGS. 2A and 2B, power is supplied to the rod antenna 4 or the helical antenna 5 from the transmission / reception circuit 12 via the hot side of the unbalanced transmission line 15 and the matching circuit 13 sequentially, and the rod antenna 4 or the helical antenna 5 is fed. When the antenna 5 is operated as an antenna, a leakage current i1 flows from the ground side of the unbalanced transmission line 15 to the shield case 16, and the shield case 16 also operates as an antenna.

However, in such a mobile phone 1,
Since the shield case 16 operates as an antenna as described above, when the user grips the housing case 2, the hand covers the shield case 16 via the housing case 2, and as a result, the antenna characteristics of the mobile phone 1 are reduced. There was a problem of deterioration.

When the case 2 held by the user is brought close to the head, the head approaches the shield case 16 via the case 2, so that the antenna characteristics of the mobile phone 1 are further deteriorated. As a result, there is a problem that the call quality is reduced.

Further, when the shield case 16 is brought closer to the user's hand or head, the power per unit time / unit mass (so-called SAR (Specific Absorption Rate)) absorbed by a specific part of the human body increases accordingly. There was a problem to do.

The present invention has been made in view of the above points, and an object of the present invention is to propose an antenna device and a portable wireless device capable of greatly reducing a decrease in communication quality.

[0026]

According to the present invention, there is provided an antenna device comprising: a first antenna and a first antenna; Second and third antenna elements, an unbalanced transmission line for feeding the first, second, and third antenna elements; the unbalanced transmission line; first, second, and third antennas And a balance-unbalance conversion means for performing a balance-unbalance conversion operation with the element. When the first, second, and third antenna elements are pushed in, the balance-unbalance conversion means is switched from the unbalanced transmission line. Power to the second and third antenna elements of the first, second, and third antenna elements through the first and second and third antenna elements to operate the second and third antenna elements as antennas. Three When the antenna element is pulled out, the first and second antenna elements of the first, second and third antenna elements are fed from the unbalanced transmission line via the unbalanced conversion means to supply the first and second antenna elements. The second antenna element was operated as an antenna.

As a result, when the second and third antenna elements and the first and second antenna elements operate as antennas, respectively, the first or second antenna element is operated by the balance-unbalance conversion operation of the balance-unbalance conversion means. The second antenna element and the second
Or, preventing the leakage current from flowing from the third antenna element to the ground member to which the unbalanced transmission line is grounded via the unbalanced transmission line, thereby preventing the ground member from operating as an antenna, Deterioration of antenna characteristics near the human body can be greatly reduced.

Further, according to the present invention, in a portable radio having an antenna device, the first and second antennas are connected to the antenna device sequentially through connecting portions made of a non-conductive material and are provided so as to be able to be pushed and pulled out. And a third antenna element, an unbalanced transmission line for feeding the first, second, and third antenna elements, and the unbalanced transmission line;
A balance-unbalance conversion means for performing a balance-unbalance conversion operation with the first, second, and third antenna elements is provided, and when the first, second, and third antenna elements are pushed in, the balance is unbalanced. The second and third antenna elements are fed from the balanced transmission line to the second and third antenna elements of the first, second, and third antenna elements via the unbalance conversion means.
When the first, second, and third antenna elements are pulled out of the first, second, and third antenna elements from the unbalanced transmission line via the balanced-unbalanced conversion means when the first, second, and third antenna elements are extracted. Is supplied to the first and second antenna elements to operate the first and second antenna elements as antennas.

As a result, when the second and third antenna elements and the first and second antenna elements operate as antennas, respectively, the first or second antenna element is operated by the balance-unbalance conversion operation of the balance-unbalance conversion means. The second antenna element and the second
Alternatively, it is possible to prevent a leakage current from flowing from the third antenna element to a ground member to which the unbalanced transmission line is grounded via the unbalanced transmission line, thereby preventing the ground member from operating as an antenna. In addition, deterioration of antenna characteristics near the human body can be significantly reduced.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) Principle As shown in FIG. 1, the first and second antenna elements 20 which are structurally and electrically symmetric, such as a dipole antenna,
2A and 2B, the first and second antenna elements 20 and 21 have the same amplitude and a phase shift of about 180 degrees from each other, as shown in FIGS. 2A and 2B. The antenna is classified as a balanced antenna because it operates when a voltage is generated and takes a balanced excitation state.

Further, as shown in FIG. 3, for example, a monopole antenna arranged almost vertically on a ground member which can be regarded as being infinite and large in size than a disk having a radius of one wavelength (electric length). As described above, the structure constituted by the ground member 22 which can be regarded as having an infinite size which is structurally asymmetric and the antenna 23 which is arranged almost perpendicularly thereto,
As shown in FIGS. 4A and 4B, the vast ground member 22 has a substantially zero potential, and a voltage that changes at a predetermined cycle is generated in the antenna 23 to operate and take an unbalanced excitation state. It is classified as an unbalanced antenna.

In the unbalanced antenna according to the present invention, since the vast ground member 22 is provided, an image current flowing through the unbalanced antenna can be easily assumed, and the antenna characteristic of the unbalanced antenna is changed to a balanced type. It can be selected almost the same as the antenna.

Further, as shown in FIG. 5, a rod antenna 4 (FIGS. 41 (A) and (B)) or a helical antenna 5 shown in a conventional portable telephone 1 (FIGS. 41 (A) and (B)).
(FIGS. 41A and 41B) and the shield case 16
The first and second antenna elements 24 and 25 which are structurally and electrically asymmetric as shown in FIGS. 42 (A) and (B).
There is also an antenna composed of

Since the antenna having such a configuration is structurally and electrically asymmetric, it cannot take a balanced excitation mode or an unbalanced excitation mode as shown in FIGS. 6A and 6B, for example. In order to take an intermediate excitation form, an antenna different from a balanced antenna and an unbalanced antenna (hereinafter, referred to as
This is called an antenna in an intermediate excitation state).

FIG. 7 shows a portable telephone 26 according to the present invention.
In the mobile phone 26, although the first and second antenna elements of the mobile phone 26 are structurally asymmetric, such as a rod antenna 28 and a helical antenna 29, By setting the electric lengths of the rod antenna 28 and the helical antenna 29 to substantially the same value, the antenna has an antenna that is electrically symmetrical and assumes a substantially balanced excitation state (hereinafter referred to as a substantially balanced antenna). An antenna device 30 is provided.

In the antenna device 30, the rod antenna 28 and the helical antenna 29 are fed from the transmission / reception circuit 31 via the unbalanced transmission line 32, so that the rod antenna 28 and the helical antenna 29
Are simultaneously operated as antennas.

Incidentally, the antenna used in the antenna device will be classified as a substantially balanced antenna hereinafter, unless otherwise specified, although it is structurally asymmetric but electrically symmetric and assumes a balanced excitation mode.

FIG. 7 shows that the transmission / reception circuit 31 is arranged outside the shield case 33 inside the housing case 27 to simplify the explanation. However, the transmission / reception circuit 31 is arranged inside the shield case 33.

As shown in FIG. 8, when a microstrip line 34 is applied as the unbalanced transmission line 32, the microstrip line 34 is formed on one surface 35A of a dielectric layer 35 having a predetermined thickness.
Is formed, and the ground conductor 37 is formed on the other surface 35B of the dielectric layer 35, so that the strip conductor 36 is on the hot side and the ground conductor 37 is on the ground side.

As described above, in the antenna device 30, as shown in FIG. 9, one rod antenna 28 of a substantially balanced antenna, for example, is connected to the transmitting / receiving circuit via the hot side 36 of the unbalanced transmission line 32. And the other helical antenna 29 is electrically connected to the transmission / reception circuit 31 via the ground side 37 of the unbalanced transmission line 32, and the shield case (via the ground side 37). (Not shown).

In the antenna device 30, however, the rod antenna 28 and the helical antenna 29 take a balanced excitation mode, whereas the unbalanced transmission line 32 takes an unbalanced excitation mode due to the grounding on the ground side 37.
The rod antenna 28
When the helical antenna 29 and the unbalanced transmission line 32 are directly electrically connected, when the rod antenna 28 and the helical antenna 29 operate as antennas, the current unbalance occurs due to the difference in the excitation state. Occurs.

As a result, in the portable telephone 26, a leakage current i2 flows from the helical antenna 29 through the ground side 37 of the unbalanced transmission line 32 to a shield case (not shown) having substantially the same potential as the ground side 37, As a result, the antenna characteristic of the mobile phone 26 is degraded when the housing case 27 is covered with the user's hand or head by operating the shield case as an antenna by the leakage current i2.

Therefore, as shown in FIG. 10, in the antenna device 30 according to the present invention, the unbalanced transmission line 32
A balun (balun: balanced-t) for performing a balance-unbalance conversion operation between the rod antenna 28 and the helical antenna 29
o-unbalanced transformer) 38, and this balun 3
8, the helical antenna 29
Leakage current i to ground side 37 of unbalanced transmission line 32 from
2 prevents the shield case from operating as an antenna due to the leakage current i2.

This balun 38 is, as shown in FIG.
It has transmission lines 39 and 40 for branching one end of the hot side 36 of the unbalanced transmission line 32 into two systems, and a substantially balanced antenna such as the rod antenna 28 is electrically connected to one of the branched transmission lines 39. At the same time, the other helical antenna 29 of this nearly balanced antenna is electrically connected to the other transmission line 40 via the phase shifter 41.

Here, in the phase shifter 41, for example, FIG.
As shown in FIG. 2, two inductive reactance elements L1 and L2 are connected in series, one end of the capacitive reactance element C1 is conductively connected to a connection midpoint P1, and the other end of the capacitive reactance element C1 is shielded. It is configured by combining a plurality of T-type phase circuits 42 having a symmetric structure grounded to a case.

In the phase shifter 41, a high-frequency signal supplied from the transmitting / receiving circuit 31 via the hot side 36 of the unbalanced transmission line 32 is transmitted to the rod antenna 28 via one transmission line 39, and the other is transmitted to the rod antenna 28 via the transmission line 39. In the phase shifter 41 of the transmission line 40, this high-frequency signal is transmitted to the helical antenna 29 with a phase shift of about 180 degrees in the operating frequency band as a balance-unbalance conversion action.

As a result, in the balun 38, the rod antenna 28 and the helical antenna 29 are set to have a voltage form similar to that shown in FIGS. The antenna operates as an antenna, thereby maintaining the current balance between the rod antenna 28 and the helical antenna 29, and preventing the leakage current i2 from flowing from the helical antenna 29 to the ground side 37 of the unbalanced transmission line 32.

According to the balun 38, the phase shifter 41 is connected to the inductive reactance element L1,
As L2 and the capacitive reactance element C, for example, 1 [m
m] Since it is possible to use a chip having a fine shape of about a square, it can be formed very small as a whole.

Therefore, in the portable telephone 26 (FIG. 7) according to the present invention, the transmission / reception circuit 31
2 and the balun 38 in order to feed the rod antenna 28 and the helical antenna 29 to the rod antenna 2
8 and the helical antenna 29 are operated as substantially balanced antennas, and at this time, the leakage current i2 is prevented from flowing from the helical antenna 29 to the ground side 37 of the unbalanced transmission line 32 due to the balance / unbalance conversion action of the balun 38. Therefore, the shield case 33 can function only as an original ground and an electrical shielding plate without operating as an antenna.

Thus, in the portable telephone 26, the deterioration of the antenna characteristics can be reduced, and the deterioration of the communication quality can be greatly reduced. Further, in the mobile phone 26, the power absorbed by the human body, that is, SAR can be significantly reduced because the shield case 33 functions only as the original ground and the electrical shield plate.

FIG. 7 shows a balun 38 arranged outside the shield case 33 inside the housing case 27.
Can be arranged both inside and outside of the device.

Further, in the portable telephone 26 according to the present invention, as shown in FIG. 13, the shield case 33, the rod antenna 28 and the helical antenna 29 are partially connected to each other inside the housing case 27 so as not to be capacitively coupled. The rod antenna 28
When the helical antenna 29 operates as an antenna, the shield case 33 is capacitively coupled to the rod antenna 28 and the helical antenna 29 to prevent the antenna from operating as an antenna.

In addition, in the portable telephone 26,
As shown in FIG. 14, a speaker 43, a liquid crystal display unit 44, various operation keys 45, and a microphone 46 are disposed on a front surface 27A of the housing case 27.
When the side is brought close to the user's head, the rod antenna 28 and the helical antenna 29
7 are arranged on the back 27B side.

Therefore, even if the housing case 27 is brought close to the head of the user, the rod antenna 28 and the helical antenna 29 can be kept away from the head, and thus the power radiated from the rod antenna 28 and the helical antenna 29 can be reduced. Absorption into the user's head is also greatly reduced.

In FIGS. 7 and 9 to 11,
Although the matching circuit is omitted to simplify the description, the matching circuit 47 can be provided, for example, between the unbalanced transmission line 32 and the balun 38, as shown in FIG.

As shown in FIG. 16, a balun 38 and
A matching circuit 48 may be provided between the rod antenna 28 and the helical antenna 29. However, if the matching circuit 48 is grounded at this time, the leakage current generated in the helical antenna 29 flows through the matching circuit 48 to the shield case 33 even if the balun 38 performs a balance-unbalance conversion operation. The case 33 operates as an antenna.

Therefore, such matching circuit 48 is
As shown in (A) and (B), an inductive connection connected in parallel between two transmission lines 48 and 50 for electrically connecting the balanced side of the balun 38 and the rod antenna 28 and the helical antenna 29 is provided. If the matching circuit 48 is constituted by the reactance element L3 or the capacitive reactance element C2 and is not grounded, the balun 38 can be used without any problem.
, And between the rod antenna 28 and the helical antenna 29.

(2) First Embodiment (2-1) Configuration of Mobile Phone According to First Embodiment In FIG. 18, in which parts corresponding to those in FIG. 1 shows a mobile phone according to a first embodiment, and a case 2 made of a non-conductive material such as a synthetic resin.
7 is provided with an antenna device 52.

In this antenna device 52, first to
An antenna section 53 provided with a third antenna element is provided.
The longitudinal direction of the housing case 27 (hereinafter referred to as the
It is provided so as to be able to be pushed and pulled out along a pushing direction indicated by an arrow b substantially parallel to the longitudinal direction of the housing) and a drawing direction opposite thereto.

FIGS. 19 and 20 show the internal structure of the portable telephone 51 excluding the matching circuit and the shield case.
As a third antenna element, a rod antenna 54 made of a conductive rod-shaped wire, and first and second helical antennas 55 and 56 formed by spirally winding a conductive wire are provided. I have.

A first power supply member 57 made of a conductive material is electrically and mechanically connected to the upper end of the first helical antenna 55, and the first power supply member 57 is made of a non-conductive material. One connecting portion 58 is mechanically connected.

A second power supply member 59 made of a conductive material is electrically and mechanically connected to the lower end of the rod antenna 54, and the second power supply member 59 is mechanically connected to the first connection portion 58. It is connected. Thereby, the rod antenna 54
And the first helical antenna 55 are mechanically connected by the first connecting portion 58 and are electrically separated from each other.

A third power supply member 60 made of a conductive material is electrically and mechanically connected to the upper end of the rod antenna 54. A second connection portion made of a non-conductive material is connected to the third power supply member 60. 61 is mechanically connected.

A fourth power supply member 62 made of a conductive material is electrically and mechanically connected to the lower end of the second helical antenna 56. The fourth power supply member 62 is connected to the second connection portion 61. Mechanically connected. As a result, the second helical antenna 56 and the rod antenna 54 are mechanically connected by the second connecting portion 61 and are electrically separated.

In addition to this, the rod antenna 54 is covered with a cylindrical rod antenna cover 63.
Helical antenna 56 has a first shape formed in a cap shape.
Is stored in the helical antenna cover 64 so as not to directly touch the human body.

Thus, in the antenna section 53, the first helical antenna 55 and the rod antenna 5
4 and the second helical antenna 56 are connected in a line in a state where they are electrically separated from each other.

On the other hand, a circuit board (not shown) on which various circuit elements such as the transmission / reception circuit 31 and the balun 38 are mounted, and a shield case made of a conductive material covering the circuit board are provided inside the housing case 27. It is stored.

Inside the upper end 27C of the case 27, first and second antenna feed terminals 65 and 66 made of a conductive material are separated from each other so as not to be capacitively coupled to each other, and extend along the longitudinal direction of the case. It is attached.

The transmission / reception circuit 31 is electrically connected to the unbalanced side of the balun 38 via the hot side of an unbalanced transmission line 32 formed of, for example, a microstrip line formed on a circuit board. The first and second antenna feed terminals 65 and 66 are electrically connected to the balanced side.

In this antenna device 52,
The rod antenna 5, the first helical antenna 55 or the second helical antenna 56 is electrically connected to the first and second antenna feed terminals 65 and 66 when the antenna unit 53 is pushed and pulled out. ing.

In the antenna device 52, when the first helical antenna cover 64 is pushed in the pushing direction when the antenna portion 53 is pushed, the antenna portion 53 is pushed.
Is pushed into the housing case 27.

In the antenna device 52, when the first helical antenna cover 64 abuts against the upper end 27C of the housing case 27 in this manner, the rod antenna 54 together with the first helical antenna 55 is connected to the housing. It is housed inside the case 27 and the fourth power supply member 62 is
And the third power supply member 60 is electrically connected to the second antenna power supply terminal 66.

At this time, the first helical antenna 55
The rod antenna 54 is disposed at a predetermined position away from the shield case to some extent so as not to be capacitively coupled to the shield case.

In this state, in the antenna device 52, when a high-frequency signal is transmitted from the transmission / reception circuit 31 to the balun 38 via the hot side of the unbalanced transmission line 32 in this state, the balun 38 converts the high-frequency signal to the first balun as it is. Of the first helical antenna 55 through the antenna power supply terminal 65 and the fourth power supply member 62, and shifts the high-frequency signal by about 180 degrees with respect to the first helical antenna 55 in the used frequency band. Then, the obtained high-frequency signal having the shifted phase is transmitted to the rod antenna 54 via the second antenna feed terminal 66 and the third feed member 60 in order.

Thus, in the antenna device 52,
The second helical antenna 56 and the rod antenna 54 adjacent to each other inside and outside the housing case 27 have the above-described structure shown in FIG.
A voltage state similar to that of (A) and (B) is generated, and the second helical antenna 56 and the rod antenna 54 are operated as substantially balanced antennas.

In addition, at this time, the antenna device 52 prevents the leakage current from flowing from the rod antenna 54 to the ground side of the unbalanced transmission line 32 due to the balance / unbalance conversion operation of the balun 38.

Thus, in the antenna device 52, a leakage current flows from the ground side of the unbalanced transmission line 32 to the shield case, and the shield case is prevented from operating as an antenna. It can function only as a simple shielding plate and ground.

Therefore, in this antenna device 52,
Even when the shield case is not operated as an antenna, the housing case 27 is gripped by the user's hand, or in this state, the housing case 27 is brought close to the user's head and the shield case is positioned near the human body. , Mobile phone 5
1 can significantly reduce the deterioration of the antenna characteristics, and can suppress the power absorbed by the human body, that is, the SAR.

On the other hand, in the antenna device 52, when the antenna unit 53 is pulled out, the rod antenna 54 is housed inside the housing case 27 and the first antenna always located outside the housing case 27. When the helical antenna cover 64 is pulled in the pull-out direction, the rod antenna 54 is pulled out from the upper end 27 </ b> C of the housing case 27.

In the antenna device 52, the first helical antenna 55 is thus connected to the housing case 27.
When the rod antenna 54 is completely pulled out from the upper end 27C of the housing case 27, the second
Is electrically connected to the first antenna power supply terminal 65, and the first power supply member 57 is electrically connected to the second antenna power supply terminal 66.

In the antenna device 52, when a high-frequency signal is transmitted from the transmission / reception circuit 31 to the balun 38 via the hot side of the unbalanced transmission line 32 in this state, the balun 38 transmits the high-frequency signal to the balun 38 as it is. 1
And the high-frequency signal is transmitted to the rod antenna 54 in the operating frequency band while the antenna feed terminal 65 and the second power supply member 59 are sequentially transmitted to the rod antenna 54.
The phase-shifted high-frequency signal obtained by shifting the phase by about 180 degrees is transmitted to the first helical antenna 55 via the second antenna feed terminal 66 and the first feed member 57 sequentially.

Thus, in the antenna device 52,
The rod antenna 54 and the first helical antenna 55 adjacent to each other inside and outside the housing case 27 have the above-described structure shown in FIG.
A voltage state similar to that of (A) and (B) is generated, and the rod antenna 54 and the first helical antenna 55 are operated as a substantially balanced antenna.

In addition, at this time, the antenna device 52 prevents the leakage current from flowing from the first helical antenna 55 to the ground side of the unbalanced transmission line 32 due to the balance / unbalance conversion operation of the balun 38.

As a result, in the antenna device 52, even when the antenna section 53 is pulled out, a leakage current flows from the ground side of the unbalanced transmission line 32 to the shield case to prevent the shield case from operating as an antenna. The shield case can function only as an original electric shield plate and ground.

Therefore, in this antenna device 52,
Since the shield case is not operated as an antenna as described above, the housing case 27 is gripped by the user's hand, or the housing case 27 is brought closer to the user's head in this state, and the shield case is positioned near the human body. Even so, the deterioration of the antenna characteristics of the mobile phone 51 can be significantly reduced, and the power absorbed by the human body, that is, the SAR can be suppressed.

Thus, the portable telephone 51 uses the rod antenna 54 drawn out of the housing case 27 and the first helical antenna 55 inside the housing case 27 when pulling out the antenna unit 53, and uses the transmission / reception circuit. A transmission signal composed of a high-frequency signal from an unbalanced transmission line 3
2 and the rod antenna 54 via the balun 38 sequentially.
And the first helical antenna 55, and transmits the transmission signal to the rod antenna 54 and the first helical antenna 5.
5 and a high-frequency signal transmitted from the base station and received by the rod antenna 54 and the first helical antenna 55, the balun 38 and the unbalanced transmission line 32. Are sequentially transmitted to the transmission / reception circuit 31.

In the portable telephone 51, when the antenna 53 is pushed in, the rod antenna 54 is pushed into the housing case 27 to prevent the portability from being impaired, and is stored inside the housing case 27. Using a rod antenna 54 and a second helical antenna 56 located outside the housing case 27, a transmission signal composed of a high-frequency signal from the transmission / reception circuit 31 is sequentially transmitted through the unbalanced transmission line 32 and the balun 38. Second helical antenna 5
6 and the rod antenna 54, and transmits the transmission signal to the base station via the second helical antenna 56 and the rod antenna 54, and is transmitted from the base station and transmitted by the second helical antenna 56 and the rod antenna 54. The received signal composed of the received high-frequency signal is transmitted to the transmission / reception circuit 31 via the balun 38 and the unbalanced transmission line 32 sequentially.

In the portable telephone 51, the antenna 53 is pushed into the housing 27 along the inner surface of the back surface 27B of the housing 27, and is pulled out from the housing 27. This first position with respect to the balun 38 inside the upper end 27 </ b> C of the housing case 27.
The electrical connection between the helical antenna 55, the rod antenna 54, and the second helical antenna 56 is switched.

When the antenna unit 53 is pushed in, the rod antenna 54 is positioned near the inside of the upper end 27C of the housing case 27 to operate as an antenna, and when the antenna unit 53 is pulled out, it is near the inside of the housing case 27. The first helical antenna 55 is positioned and operated as an antenna.

Therefore, in the portable telephone 51, the rod antenna 54 operating as an antenna as described above
Or the hand of a user holding the first helical antenna 55 on the housing case 27, or the front 27A of the housing case 27.
Can be relatively distant from the head of the user to be brought closer, and thus the deterioration of the antenna characteristics of the mobile phone 51 can be further reduced.

Incidentally, comparing the physical lengths of the rod antenna 54 and the first helical antenna 55,
The helical antenna 55 is formed by spirally winding it.
Its physical length can be significantly reduced. Therefore, the first helical antenna 55 can be further moved away from the user's hand or head when pulling out the antenna unit 53 as compared with the rod antenna 54 when pushing the antenna.

By the way, in this portable telephone 51,
Comparing the frequency bands of the rod antenna 54 and the first and second helical antennas 55 and 56, the first and second helical antennas 55 and 56 usually differ due to differences in their shapes and physical sizes. In comparison with the rod antenna 54, a relatively wide frequency band can be secured.

In the portable telephone 51, the rod antenna 54 is always operated as an antenna both when the antenna unit 53 is pushed in and when it is pulled out, so that a relatively wide frequency band can always be secured.

By the way, in this portable telephone 51, the balun 3
As described above, a fine chip of about 1 [mm] square can be used for the inductive reactance element and the capacitive reactance element constituting 8, and the balun 38 itself can be formed small as a whole. Even if such a balun 38 is provided inside the housing case 27, it is possible to prevent the housing case 27 from being significantly increased in size.

(2-2) Operation and Effect of First Embodiment In the above configuration, in the portable telephone 51, the first helical antenna 55 is provided on the upper end 27C of the housing case 27.
, Rod antenna 54, second helical antenna 5
The antenna unit 53 is provided so as to be able to be pushed and pulled out in a row.

When the antenna unit 53 is pushed in, the power is supplied from the transmission / reception circuit 31 to the second helical antenna 56 and the rod antenna 54 via the unbalanced transmission line 32 and the balun 38 in order, and the second helical antenna 56 and the rod The antenna 54 is operated as a substantially balanced antenna, and at this time, a leakage current is prevented from flowing from the rod antenna 54 to the ground side of the unbalanced transmission line 32 due to the balance / unbalance conversion operation of the balun 38.

When the antenna unit 53 is pulled out, power is supplied from the transmission / reception circuit 31 to the rod antenna 54 and the first helical antenna 55 via the unbalanced transmission line 32 and the balun 38 in order, and the rod antenna 54 and the first helical antenna 55 are fed. The antenna 55 is operated as a substantially balanced antenna, and also in this case, the balun 38 prevents the leakage current from flowing from the first helical antenna 55 to the ground side of the unbalanced transmission line 32 due to the unbalanced conversion operation. I do.

Therefore, in the portable telephone 51, it is possible to prevent the leakage current from flowing into the shield case and to operate as an antenna, and it is possible to greatly reduce the deterioration of the antenna characteristics near the human body.

Further, the portable telephone 51 has an antenna 5
3, the hand of the user holding the rod antenna 54 on the housing case 27 at the time of pushing in, or the front 27 of the housing case 27
A is arranged relatively far from the user's head to which A is approached, and the first helical antenna 54 is similarly arranged away from the user's hand and head when the antenna unit 5 is pulled out. Deterioration of antenna characteristics can be further reduced.

In this portable telephone 51, since the shield case is not operated as an antenna and the rod antenna 54 and the first helical antenna 55 are kept away from the user's hand or head, the power absorbed by the human body is obtained. Can be significantly reduced.

According to the above configuration, when the antenna section 53 is pushed in, the second helical antenna 56 and the rod antenna 54 are fed from the transmission / reception circuit 31 via the unbalanced transmission line 32 and the balun 38 in order, and a substantially balanced type While operating as an antenna, the unbalanced transmission line 32 and the balun 3
8, the rod antenna 54 and the first helical antenna 55 are fed to operate as a substantially balanced antenna. At this time, the rod antenna 54 and the first helical antenna 55 5
5 prevents leakage current from flowing to the ground side of the unbalanced transmission line 32, thereby preventing the shield case from operating as an antenna and greatly reducing deterioration of antenna characteristics near the human body. Thus, it is possible to realize a mobile phone capable of significantly reducing the deterioration of the call quality.

(3) Second Embodiment (3-1) Configuration of Cellular Phone According to Second Embodiment FIG. 21 in which parts corresponding to those in FIG.
FIG. 18 shows a mobile phone 67 according to the second embodiment, which is configured similarly to the mobile phone 51 (FIG. 18) according to the above-described first embodiment except for the configuration of the antenna device 68.

The antenna device 68 has a cap-shaped second helical antenna cover 69 provided on the back surface 27B of the upper end 27C of the housing case 27.
Upper end 69A of this second helical antenna cover 69
The antenna unit 53 is provided so as to be able to be pushed and pulled out.

Therefore, in the portable telephone 67, the antenna 53 is pushed into the housing 27 via the second helical antenna cover 69, so that the antenna 53
Can be shortened as compared with the mobile phone 51 according to the above-described first embodiment.

As a result, in the portable telephone 67, the antenna 53 can be largely moved away from the hand of the user holding the housing case 27 or the user's head to which the housing case 27 can be approached in this state. Thus, the deterioration of the antenna characteristics of the mobile phone 67 can be further reduced.

In FIGS. 22 and 23 in which parts corresponding to those in FIGS. 19 and 20 are denoted by the same reference numerals, the first and second antenna feeds are provided inside the second helical antenna cover 69. The terminals 65 and 66 are separated so as not to be capacitively coupled to each other, and are provided side by side along the longitudinal direction of the housing.

A balun 38 is provided inside the second helical antenna cover 69.
8 is the first and second antenna feed terminals 65.
And 66 are electrically connected.

In the antenna device 68, when the antenna section 53 is pushed in, the first helical antenna cover 64 is connected to the upper end 6 of the second helical antenna cover 69.
9A so that the antenna section 53
Is pushed from the inside of the helical antenna cover 69 to the inside of the housing case 27, the second helical antenna 56 is connected to the inside of the second helical antenna cover 69 via the fourth power supply member 62. And the rod antenna 54 is electrically connected to the second antenna power supply terminal 66 via the third power supply member 60.

Thus, in the antenna device 68, the rod antenna 54 can be pushed from the inside of the second helical antenna cover 69 to the inside of the housing case 27. Thus, inside the housing case 27, The portion into which the rod antenna 54 is pushed can be greatly shortened.

In the antenna device 68, when the antenna portion 53 is pulled out from the upper end 69A of the second helical antenna cover 69 when the antenna portion 53 is pulled out, the second helical antenna cover 69 is pulled out.
The rod antenna 54 is connected to the second feeding member 5 inside the
9 and is electrically connected to a first antenna feeding terminal 65 via a first feeding member 57 and a second helical antenna 55 is electrically connected to a second antenna feeding terminal 66 via a first feeding member 57.

As a result, in the antenna device 68, almost the entire first helical antenna 55 can be pulled out from the inside of the housing case 27 and housed inside the second helical antenna cover 69. Nearly the entire antenna section 53 can be pulled out from the inside of the housing case 27.

Therefore, in the portable telephone 67, the rod antenna 54 is gripped by the housing case 27 as compared with the portable telephone 51 according to the first embodiment (FIGS. 19 and 20) when the antenna section 53 is pushed. The user's hand, or the user's head to which the housing case 27 can be approached.

Further, in the portable telephone 67, when the antenna unit 53 is pulled out, the first helical antenna 55 is compared with the portable telephone 51 according to the above-described first embodiment.
Can be largely separated from the hand of the user holding the casing case 27 or the head of the user to which the casing case 27 is brought close.

As a result, in this portable telephone 67, deterioration of antenna characteristics near the human body can be further reduced as compared with the first embodiment, and the power absorbed by the human body can be further reduced. Can be.

In addition, in this portable telephone 67, even if it is difficult to push the antenna section 53 easily due to the space occupied by the battery or the like inside the housing case 27, the inside of the housing case 27 Since the portion pushed into the antenna section 53 is greatly shortened, the antenna section 53 can be easily provided so as to be able to be pushed and pulled out freely.

In the portable telephone 67, the balun 38 is provided inside the second helical antenna cover 69.
However, as described above, a fine chip of about 1 mm square can be used for the inductive reactance element and the capacitive reactance element constituting the balun 38. Therefore, the balun 38 itself is also small in size as a whole. Therefore, the second helical antenna cover 69 is attached to the first helical antenna cover 69.
The size of the helical antenna 55 can be substantially the same as that of the helical antenna 55, and thus the mobile phone 67 can be prevented from being significantly enlarged in the longitudinal direction of the housing.

(3-2) Operation and Effect of Second Embodiment In the above configuration, in the portable telephone 67, the second helical antenna cover 69 is provided on the upper end 27C of the housing case 27, and the second helical antenna cover 69 is provided. 2 Helical antenna cover 6
The antenna section 53 is provided at the upper end of 9 so as to be able to be pushed and pulled out freely.

In the portable telephone 67, when the antenna 53 is pushed in, the antenna 53 is moved from the inside of the second helical antenna cover 69 to the housing case 2.
7, and when the antenna section 53 is pulled out, almost the entire antenna section 53 is
To be pulled out from the inside.

Therefore, in the portable telephone 67, the part of the antenna 53 that is pushed into the housing case 27 when the antenna 53 is pushed in and pulled out can be greatly shortened. The case 27 can be largely separated from the hand of the user holding the case 27 or the user's head to which the housing case 27 can be approached.

Therefore, in the portable telephone 67, the deterioration of the antenna characteristics near the human body can be further reduced.

According to the above configuration, the second helical antenna cover 69 provided on the upper end 27C of the housing case 27.
The antenna section 53 is provided at the upper end 69A of the case so as to be able to be pushed in and pulled out. In addition to the effects obtained by the above-described first embodiment, the antenna section 53 can be held by the user holding the housing case 27. It is possible to further reduce the deterioration of the antenna characteristics near the human body by keeping the user or the user's head to which the housing case 27 is brought far away.

(4) Other Embodiments In the first and second embodiments described above, a case is described in which the microstrip line 34 shown in FIG. But
The present invention is not limited to this, and the cylindrical outer conductor 96 (that is, the ground side) as shown in FIG. 24 and the linear center conductor 97 (that is, the hot side) inserted into the outer conductor 96 are insulated from each other. Various other unbalanced transmission lines, such as a coaxial cable 98 formed in this way, can be applied.

In the first and second embodiments described above, a case is described in which a phase shifter 41 configured by combining a plurality of phase circuits 42 shown in FIG. 12 is used for the balun 38 shown in FIG. However, the present invention is not limited to this, and as shown in FIGS.
T is a symmetrical structure in which two capacitive reactance elements C3 and C4 are connected in series, one end of the inductive reactance element L4 is conductively connected to a connection midpoint P2, and the other end of the inductive reactance element L4 is grounded. And one end of capacitive reactance elements C5 and C6 are electrically connected to one end and the other end of inductive reactance element L5, respectively.
A combination of a plurality of symmetric π-type phase circuits 100 in which the other ends of the capacitive reactance elements C5 and C6 are grounded, and a capacitive reactance element C7
The inductive reactance element L6 at one end and the other end, respectively.
And one end of each of the inductive reactance elements L6 and L7 are grounded, and a plurality of π-type phase circuits 101 having a symmetric structure are connected to each other. If the phase can be shifted by about 180 degrees in the working frequency band, a phase shifter having various other configurations can be used.

Further, in the above-described first and second embodiments, the case where the balun 38 shown in FIG. 11 is used has been described. If a leakage current can be prevented from flowing to the ground side of the balanced transmission line 32, a balun having various other configurations can be used.

As a balun of this type, FIG.
A balun 103 having another configuration using an unbalanced transmission line 102 formed of a coaxial cable. A coaxial cable (hereinafter, referred to as a balun) having an electrical length of 1/2 wavelength at a used frequency is provided at one end of a hot side 104 of the unbalanced transmission line 102. The one end of the hot side 106 of the detour path 105 is electrically connected, and the other end of the ground side 108 of the detour path 105 is electrically connected to one end of the ground side 107 of the unbalanced transmission line 102. It is configured. That is, the balun 103 having such a configuration is the same as the phase shifter 41 of the balun 38 shown in FIG.
Instead, a bypass line 105 having an electrical length of 1/2 wavelength is used.

In the balun 103 having such a configuration, the first antenna element of the substantially balanced antenna is electrically connected to one end of the hot side 104 of the unbalanced transmission line 102, and the hot side 106 of the detour path 105 is connected. The other end of the substantially balanced type antenna is electrically connected to the other end of the antenna, and a high-frequency signal transmitted to the first antenna element via the hot side 104 of the unbalanced transmission line 102 is transmitted to the bypass line 105. The phase is shifted to the second antenna element by about 180 degrees from the first antenna element via the hot side 106 and transmitted to the second antenna element, thereby leaking from the second antenna element to the ground side 108 of the unbalanced transmission line 102. This prevents current from flowing.

As this type of balun, as shown in FIG. 27, first and second inductive reactance elements L8
And L9, and the first and second capacitive reactance elements C
8 and C9 are sequentially and alternately connected in a ring shape, and the hot side of an unbalanced transmission line (not shown) is electrically connected to a midpoint P3 between the first inductive reactance element L8 and the second capacitive reactance element C9. Connected to the first capacitive reactance element C8 and the second inductive reactance element L
9 is electrically connected to the ground side of the unbalanced transmission line at a connection point P4, and not shown at a connection point P5 between the first inductive reactance element L8 and the first capacitive reactance element C8. The first antenna element of the substantially balanced antenna is electrically connected, and the second inductive reactance element L8 and the second capacitive reactance element C
8 is connected to the second point P6 of this almost balanced antenna.
There is also a so-called LC bridge balun configured by electrically connecting the above antenna elements.

In the balun 109 having such a configuration, the inductances L of the first and second inductive reactance elements L8 and L9 are set to the same value, respectively, and the capacitance C of the first and second capacitive reactance elements C7 and C8 is set. Are set to the same value, and the inductance L and the capacitance C are calculated by the following equation.

[0130]

(Equation 1)

And the following equation

[0132]

(Equation 2)

By selecting so as to satisfy
The high-frequency signal given from the hot side of the unbalanced transmission line is sent to the first antenna element from the connection midpoint P5 as it is, and this high-frequency signal is shifted by about 180 degrees with respect to the first antenna element in the used frequency band. The signal is shifted and transmitted to the second antenna element from the obtained connection midpoint P6 with the phase shifted. Note that Z1 represents the impedance between the hot side and the ground side of the unbalanced transmission line, and Z2 represents the impedance between the connection midpoints P5 and P6. Further, f represents a used frequency.

The balun 109 having such a configuration can be formed as a fine chip having a size of about 1 [mm] similarly to the phase shifter 41 of the balun 38 shown in FIG. Second embodiment of the present invention
Helical antenna cover 69 (FIGS. 22 and 23)
It can be easily provided even when the arrangement space is limited, as in the case of FIG.

Further, as this type of balun, FIG.
As shown in (A) and (B), between an air-core coil 110 formed between the hot side and the ground side of an unbalanced transmission line (not shown) and the first and second antenna elements of a substantially balanced antenna. The transformer-type balun 112 facing the formed air-core coil 111 and the air-core coil 113 formed between the first antenna element of the hot side of the unbalanced transmission line and the substantially balanced antenna, and the unbalanced There is also a transformer-type balun 115 in which an air-core coil 114 formed between the ground side of the transmission line and the second antenna element of the substantially balanced antenna is opposed.

In addition, as shown in FIG. 29, this type of balun includes an air-core coil 116 formed between the hot side of an unbalanced transmission line (not shown) and the first antenna element of a substantially balanced antenna. And an air-core coil 11 formed between the ground side and ground of the unbalanced transmission line.
7 and the air-core coil 118 formed between the ground side and the second antenna element of the substantially balanced antenna, and the air-core coil 119 formed between the hot side and the ground. Transformer type balun 1
There are also 20.

Trans-type balun 1 having a related configuration
In 20, the impedance between the connection terminals of the first and second antenna elements is about four times (4Z3) the impedance Z3 between the hot side and the ground side of the unbalanced transmission line.

FIGS. 28A and 28B and FIG.
In the transformer type baluns 112, 115 and 120 shown in FIG.
Instead of 4, 116, 117, 118 and 119, FIG.
As shown in FIG.
2 and a pair of coils 124 and 125 formed by the conductor pattern 123 can also be used.

Then, the transformer type baluns 112 and 115
And 120 can be formed by a fine chip having a size of about 1 to 3 [mm] as a whole when the coil formed by integrating the conductor patterns is used as described above. As in the case of 27), even when the arrangement space is limited, it can be easily provided.

FIG. 31A shows a balun of this type.
And (B) show an unbalanced transmission line 10 made of a coaxial cable.
2 is a balun 126 having another configuration using the cylindrical conductor 1.
27, the unbalanced transmission line 102 is inserted, one end 127A of the cylindrical conductor 127 is opened, and the other end 127A is opened.
B is a so-called Sperrtopf balun or Bazooka balun short-circuited to the ground side 107 of the unbalanced transmission line 102.

In the balun 126 having such a configuration, the first antenna element of the substantially balanced antenna is electrically connected to the hot side 104 of the unbalanced transmission line 102 on the open side (balanced side) of the cylindrical conductor 127. As well as
The second antenna element of the substantially balanced antenna is electrically connected to the ground side 107 of the unbalanced transmission line 102, and the unbalanced transmission line 102 is connected to the short-circuited side (unbalanced side) of the cylindrical conductor 127. The transmission / reception circuit 31 is electrically connected to the hot side 104 and the ground side 107 of FIG.

In the balun 126, since the cylindrical conductor 127 is selected to have an electrical length of 円 筒 wavelength of the used frequency, the unbalanced transmission line 102 as a whole is viewed from the balanced side to the unbalanced side. One of which is short-circuited as the inner conductor and the cylindrical conductor 127 as the outer conductor 1
It can be regarded as a transmission line having an electrical length of / 4 wavelength, and the impedance becomes infinite with respect to the leakage current. Therefore, it is possible to prevent the leakage current from flowing to the ground side 107 of the unbalanced transmission line 102. .

FIG. 32 shows a super-top balun 128 using the unbalanced transmission line 32 formed of a microstrip line. The hot side 36 is formed in a linear shape by considering the hot side 36 as a central conductor of a coaxial cable. By forming the ground side 37 into a shape resembling the outer conductor of a coaxial cable and the cross section of a cylindrical conductor, the ground side 37 is equivalent to the super top balun 126 shown in FIGS. 31A and 31B and operates similarly.

FIG. 33 shows a balun 129 having another configuration using an unbalanced transmission line 102 formed of a coaxial cable.
A conductor (hereinafter, referred to as a branch conductor) 130 having an electrical length of / 4 wavelength is arranged with its other end aligned.
One end of the unbalanced transmission line 102 is electrically connected to one end of the hot side 104 of the unbalanced transmission line 102, and the other end of the branch conductor 130 is electrically connected to a portion of the unbalanced transmission line 102 facing the ground side 107. It is configured.

In the balun 129 having such a configuration, the first antenna element is electrically connected to the other end of the hot side 104 of the unbalanced transmission line 102, and the unbalanced transmission line 102
By electrically connecting the second antenna element to the other end of the ground side 107, a circuit equivalent to the baluns 126 and 128 shown in FIGS. 31A and 31B and FIG. Similarly to the baluns 126 and 128, the impedance at the other end of the unbalanced transmission line 102 on the ground side 107 is made infinite to prevent leakage current.

Furthermore, in the above-described first and second embodiments, the case where a substantially balanced antenna is used has been described. However, the present invention is not limited to this, and it is structurally and electrically complete. It is also possible to use a symmetrically balanced antenna or an antenna having an intermediate excitation state that is completely asymmetrical structurally and electrically. Incidentally, when the antenna in the intermediate excitation mode is used, the voltage modes in the first and second antenna elements are different from each other.
If the baluns 126, 128 and 129 shown in FIG. 3 are used, it is possible to prevent a leakage current from flowing from the first or second antenna element to the ground side of the unbalanced transmission line.

Further, in the first and second embodiments, the first and / or second helical antennas 55 and / or 56 formed by spirally winding a conductive wire are used. However, the present invention is not limited to this, and as shown in FIGS. 34A and 34B, a helical antenna 133 formed by a through hole 131 and a conductor pattern 132 in a multilayer wiring board 130, a circuit board 134, and the like. Like the antenna element 136 formed by forming the conductor pattern 135 in a meandering shape on one surface 134A,
In addition, various antenna elements may be used.

In the first and second embodiments, the rod antenna 5 made of a conductive rod-shaped wire is used.
5, the present invention is not limited to this. As shown in FIG. 35, a conductive wire is spirally and densely wound to form an electrically cylindrical conductor. The closely wound coil 139 may be used as an antenna element. If the close-wound coil 139 is used as an antenna element, it is possible to prevent the first antenna portions 53, 67, and 82 from being damaged even when bent when pulled out.

Further, in the above-described first and second embodiments, the case where the antenna section 53 provided with the rod antenna 54 is used has been described. However, the present invention is not limited to this, and FIG. 36 (A) and (B) in which the same reference numerals are assigned to corresponding parts of FIG. 36, and FIGS. 37 (A) and (B) in which the same reference numerals are similarly assigned to corresponding parts in FIG. Antenna unit 140 provided with
And 141, the antenna unit 140 is used.
When the rods 141 and 141 are pushed, a shortened rod antenna may be formed. Accordingly, when the antenna portions 140 and 141 are pushed into the inside of the housing case 27, the portion into which the antenna portions 140 and 141 are pushed can be further shortened, and the antenna portions 140 and 141 can be further moved away from the user's hand or head.

In practice, in FIGS. 36 (A) and (B),
In the antenna section 140, the second feeding member 59 is provided at the lower end of the first antenna half 142 made of a conductive tubular member.
Are electrically and mechanically connected, a pull-out stop 143 is provided at the upper end of the first antenna half 142, and the second antenna half 1 made of a conductive rod-shaped member is provided.
The lower end of 44 is the hole 14 of the first antenna half 142.
2A is provided so as to be able to be pushed and pulled out freely.

The hole 14 of the first antenna half 142
A sliding spring 145 made of a conductive material is electrically and mechanically connected to the lower end of the second antenna half 144 located in 2A, and is connected to the upper end of the second antenna half 144. The third power supply member 60 is electrically and mechanically connected. Further, the first and second antenna halves 14
2 and 144 have antenna covers 146 and 1 respectively.
47 are coated.

In the antenna section 140,
When the second antenna half 144 is pushed into or pulled out of the first antenna half 142, the sliding spring 14 is inserted into the hole 142A of the first antenna half 142.
The first and second antenna halves 142 and 144 are electrically connected via the sliding springs 145 to form a telescopic rod antenna by sliding while the fifth antenna 5 is electrically connected. be able to.

In FIGS. 37A and 37B, in the antenna section 141, the second antenna half 144
A second feeding member 59 is electrically and mechanically connected to the lower end of the first antenna half 144, and the upper end of the first antenna half 144 can be pushed and pulled out into the hole 142A of the first antenna half 142. It is provided in. A third power supply member 60 is electrically and mechanically connected to the upper end of the first antenna half 142.

Therefore, also in the antenna section 141 having such a configuration, like the above-mentioned antenna section 140 (FIGS. 36A and 36B), the first and second antenna halves 142 and 144 can be used to extend and retract a rod antenna. Form.

The related antenna units 140 and 141
, The close-wound coil 139 described above may be used as the first antenna half 142.

Further, in the first and second embodiments, the antenna section 5 is provided at the upper end 27C of the housing case 27 or the upper end 69A of the second helical antenna cover 69.
18 has been described so as to be capable of being pushed and pulled out along a pushing direction substantially parallel to the longitudinal direction of the housing and a drawing direction opposite to the pushing direction. However, the present invention is not limited to this. FIG. 38 showing the corresponding parts with the same reference numerals
As shown in FIGS. 39A and 39B and FIG. 39 in which parts corresponding to those in FIG. 21 are assigned the same reference numerals, the antenna unit 53 is moved from the rear surface 27B of the upper end 27C of the housing case 27 to the front surface 27A of the lower end 27D. May be provided so as to be able to be pushed and pulled out along a direction inclined with respect to the longitudinal direction of the side housing.

As a result, when the antenna 53 is pulled out and the mobile phone is moved closer to the user's head, the antenna 53 can be further moved away from the head, thus deteriorating the antenna characteristics of the mobile phone near the human body. It can be further reduced.

In the first and second embodiments, as described in the principle, the matching circuit is provided between the transmitting / receiving circuit 31 and the balun 38 or between the balun 38, the rod antenna 28 and the helical antenna. 29, the present invention is not limited to this. Matching circuits 148 and 149 are provided on both the balanced side and the unbalanced side of the balun 38, as shown in FIG. You may do it.

Further, in the above-described first and second embodiments, the leakage current does not flow from the second antenna element to the ground side of the unbalanced transmission line 32 due to the balance / unbalance conversion operation of the balun 38. However, the present invention is not limited to this, and the connection of the first and second antenna elements to the terminal on the balanced side of the balun 38 is switched to convert the balun 38 into an unbalanced conversion. Accordingly, it is possible to prevent a leakage current from flowing from the first antenna element to the ground side of the unbalanced transmission line 32.

Further, in the above-described first and second embodiments, a case has been described in which the present invention is applied to the above-described portable telephones 51 and 67. However, the present invention is not limited to this, and may be, for example, a cordless telephone. Like a handset of a telephone,
In addition, it can be widely applied to various portable wireless devices.

Further, in the above-described first and second embodiments, the first, second, and third members are provided so as to be able to be pushed and pulled out successively via connecting portions made of a non-conductive material. As antenna elements, a first helical antenna 55, a rod antenna 54, a second helical antenna 5
6 has been described, but the present invention is not limited to this, and various first, second, and third antennas can be used in addition to the above-described telescopic rod antenna, meander-shaped antenna element, and the like. Can be widely applied.

Further, in the above-described first and second embodiments, the unbalanced transmission line, the first, second, and third
As described above, the balun 36 is applied as the unbalanced conversion means for performing the unbalanced conversion operation with the antenna element of the present invention. However, the present invention is not limited to this. As long as a balance-unbalance conversion operation can be performed between the first, second, and third antenna elements, other various balance-unbalance conversion means can be widely applied like the various baluns described above. it can.

Further, in the above-described first and second embodiments, the balun conversion means is accommodated, and the first and second baluns are accommodated.
In addition, the case where the second helical antenna cover 69 is applied as a storage means into which the third antenna element is pushed and pulled out through the inside has been described, but the present invention is not limited to this, and the present invention is not limited to this. If the conversion means is housed so that the first, second and third antenna elements can be pushed and pulled out through the inside, various other housings can be provided like the housing means integrated with the housing case. Means can be applied.

[0164]

As described above, according to the present invention, in the antenna device, the first and second antennas are provided so as to be able to be pushed and pulled out successively via connecting portions made of a non-conductive material.
And a third antenna element, an unbalanced transmission line for feeding the first, second, and third antenna elements, the unbalanced transmission line, the first, second, and third antenna elements. And a balance-unbalance conversion means for performing a balance-unbalance conversion operation between the first and second and third antenna elements when the first, second and third antenna elements are pushed in. By feeding power to the second and third antenna elements of the first, second, and third antenna elements, the second and third antenna elements are operated as antennas, and the first, second, and third antenna elements are operated. When the antenna element is extracted, power is supplied from the unbalanced transmission line to the first and second antenna elements of the first, second, and third antenna elements via the balanced-unbalanced conversion means, and the first antenna element is connected to the first antenna element.
And by operating the second antenna element as an antenna, the second and third antenna elements,
When the first and second antenna elements operate as antennas, respectively, the second or third antenna element and the first or second antenna element are separated from each other by the balance-unbalance conversion operation of the balance-unbalance conversion unit. Prevents leakage current from flowing through the unbalanced transmission line to the ground member to which this unbalanced transmission line is grounded, prevents this ground member from operating as an antenna, and greatly reduces the deterioration of antenna characteristics near the human body. Therefore, it is possible to realize an antenna device that can greatly reduce the decrease in speech quality.

In a portable wireless device having an antenna device, the first, second, and third antennas are connected to the antenna device via a connection portion made of a non-conductive material, and are provided so as to be capable of being pushed and pulled out. An antenna element, an unbalanced transmission line for feeding the first, second, and third antenna elements; and a balanced line between the unbalanced transmission line, the first, second, and third antenna elements. And an unbalanced conversion means for performing an unbalanced conversion operation. When the first, second, and third antenna elements are pushed in, the first and second antenna elements are switched from the unbalanced transmission line via the balanced-unbalanced conversion means. The second and third antenna elements of the second and third antenna elements are fed to operate the second and third antenna elements as antennas, and the first, second and third antenna elements are pulled. At this time, the first and second antenna elements are fed from the unbalanced transmission line to the first and second antenna elements among the first, second, and third antenna elements via the unbalanced conversion means. By operating the elements as antennas, the second and third antenna elements and the first and second antenna elements each operate as an antenna to convert the unbalanced balance of the balanced-unbalanced conversion means. This prevents leakage current from flowing from the second or third antenna element and the first or second antenna element to the ground member to which the unbalanced transmission line is grounded via the unbalanced transmission line, By preventing this ground member from operating as an antenna, deterioration of antenna characteristics near the human body can be significantly reduced,
Thus, it is possible to realize a portable wireless device capable of greatly reducing the deterioration of the call quality.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of a balanced antenna.

FIG. 2 is a schematic voltage waveform diagram for explaining the operation of the balanced antenna.

FIG. 3 is a schematic diagram illustrating a configuration of an unbalanced antenna.

FIG. 4 is a schematic voltage waveform diagram for explaining the operation of the unbalanced antenna.

FIG. 5 is a schematic diagram illustrating a configuration of an intermediate excitation form antenna.

FIG. 6 is a schematic voltage waveform diagram for explaining an example of the operation of the intermediate excitation state antenna.

FIG. 7 is a schematic sectional view for explaining the principle of the mobile phone according to the present invention.

FIG. 8 is a schematic perspective view showing a configuration of an unbalanced transmission line composed of a microstrip line.

FIG. 9 is a schematic block diagram for explaining connection between an unbalanced transmission line, a rod antenna, and a helical antenna.

FIG. 10 is a schematic block diagram for explaining connection between an unbalanced transmission line using a balun, a rod antenna, and a helical antenna.

FIG. 11 is a block diagram illustrating a configuration of a balun.

FIG. 12 is a block diagram illustrating a configuration of a balun phase circuit.

FIG. 13 is a schematic diagram for describing the arrangement of a rod antenna, a helical antenna, and a shield case.

FIG. 14 is a schematic side view for explaining an arrangement of a rod antenna and a helical antenna with respect to a housing case.

FIG. 15 is a block diagram for explaining the arrangement of a matching circuit on the unbalanced side of the balun.

FIG. 16 is a block diagram for explaining the arrangement of a matching circuit on the balanced side of the balun;

FIG. 17 is a block diagram showing a configuration of a matching circuit arranged on the balanced side of the balun.

FIG. 18 is a schematic side view showing the first embodiment of the configuration of the mobile phone according to the present invention.

FIG. 19 is a block diagram showing an internal configuration of the mobile phone when the antenna unit is pushed in according to the first embodiment.

FIG. 20 is a block diagram showing an internal configuration of the mobile phone when the antenna unit is pulled out according to the first embodiment.

FIG. 21 is a schematic side view showing the internal configuration of the mobile phone according to the second embodiment.

FIG. 22 is a block diagram showing an internal configuration of the mobile phone when the antenna unit is pushed in according to the second embodiment.

FIG. 23 is a block diagram showing an internal configuration of the mobile phone when the antenna unit is pulled out according to the second embodiment.

FIG. 24 is a schematic diagram illustrating a configuration of an unbalanced transmission line including a coaxial cable according to another embodiment.

FIG. 25 is a block diagram showing a configuration of a phase circuit according to another embodiment.

FIG. 26 is a schematic diagram illustrating a configuration of a balun according to another embodiment.

FIG. 27 is a schematic diagram illustrating a configuration of a balun according to another embodiment.

FIG. 28 is a schematic diagram showing a configuration of a balun according to another embodiment.

FIG. 29 is a schematic diagram illustrating a configuration of a balun according to another embodiment.

FIG. 30 is a top view showing a coil used for a transformer balun.

FIG. 31 is a schematic sectional view and a schematic diagram showing a configuration of a super top balun using a coaxial cable according to another embodiment.

FIG. 32 is a schematic diagram showing a configuration of a super top balun using a microstrip line according to another embodiment.

FIG. 33 is a schematic diagram illustrating a configuration of a balun according to another embodiment.

FIG. 34 is a schematic top view showing a configuration of an antenna element replacing the first and second helical antennas according to another embodiment.

FIG. 35 is a schematic diagram illustrating a configuration of an antenna element replacing the rod antenna.

FIG. 36 is a schematic cross-sectional view showing a configuration of an antenna unit provided with a telescopic rod antenna according to another embodiment.

FIG. 37 is a schematic sectional view showing the configuration of an antenna unit provided with a telescopic rod antenna according to another embodiment.

FIG. 38 is a schematic side view for explaining push-in and pull-out directions of an antenna unit according to another embodiment.

FIG. 39 is a schematic side view for explaining push-in and pull-out directions of an antenna unit according to another embodiment.

FIG. 40 is a block diagram for describing an arrangement of a matching circuit according to another embodiment;

FIG. 41 is a block diagram showing a circuit configuration of a conventional mobile phone.

FIG. 42 is a schematic front view for explaining the operation of a conventional shield case as an antenna.

[Explanation of symbols]

26, 51, 67 ... mobile phone, 27 ... housing case, 28, 54 ... rod antenna, 29 ... helical antenna, 30, 52, 68 ... antenna device, 31 ...
... Transceiver circuit, 32, 102 ... Unbalanced transmission line, 33
…… Shield case, 36, 104 …… Hot side, 3
7, 107 ... ground side, 38, 103, 109, 1
12, 115, 120, 126, 128, 129, balun, 53, antenna section, 55, first helical antenna, 56, second helical antenna, 69, second helical antenna cover.

Continuation of the front page (72) Inventor Hiroki Ito 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo F-term in Sony Corporation (reference) 5J021 AA02 AA13 AB02 CA03 DA02 EA01 FA33 FA34 HA10 5J046 AA02 AA03 AB06 AB07 AB12 JA05 JA10 JA13 5J047 AA02 AB06 AB07 AB12 FA09 FA12 FD01

Claims (8)

[Claims] A first, a second, and a third antenna element which are successively provided via connecting portions made of a non-conductive material and are provided so as to be able to be pushed and pulled out; and the first, second, and third antenna elements. An unbalanced transmission line for feeding power to the antenna element, a balanced-unbalanced conversion means for performing a balanced-unbalanced conversion operation between the unbalanced transmission line, and the first, second, and third antenna elements. And the first, second, and third
When the antenna element is pushed, power is supplied from the unbalanced transmission line to the first and second antenna elements of the first, second, and third antenna elements via the balanced-unbalanced conversion means. The first and second antenna elements are operated as antennas, and when the first, second and third antenna elements are pulled out, the first and second antenna elements are transferred from the unbalanced transmission line via the balanced / unbalanced conversion means. An antenna device, characterized in that the second and third antenna elements of the second and third antenna elements are fed to operate the second and third antenna elements as the antenna. 2. When the first, second and third antenna elements are pushed in, only the second and third antenna elements are pushed into the first, second and third antenna elements. The antenna device according to claim 1, wherein the first and second antenna elements are pulled out when the first, second, and third antenna elements are pulled out. 3. The antenna device according to claim 2, wherein said second antenna element is a rod-shaped rod antenna. 4. The storage device according to claim 3, further comprising storage means for storing said balance-unbalance conversion means, wherein said first, second and third antenna elements are pushed and pulled through the inside. The antenna device as described in the above. 5. A portable wireless device having an antenna device, wherein the antenna device is provided with first, second, and third members which are connected to each other via a connecting portion made of a non-conductive material and are provided so as to be able to be pushed and pulled out. And an unbalanced transmission line for feeding power to the first, second, and third antenna elements; and between the unbalanced transmission line, the first, second, and third antenna elements. And a balance-unbalance conversion means for performing a balance-unbalance conversion operation in the first, second, and third means.
When the antenna element is pushed, power is supplied from the unbalanced transmission line to the first and second antenna elements of the first, second, and third antenna elements via the balanced-unbalanced conversion means. The first and second antenna elements are operated as antennas, and when the first, second and third antenna elements are pulled out, the first and second antenna elements are transferred from the unbalanced transmission line via the balanced / unbalanced conversion means. A portable wireless device characterized in that the second and third antenna elements of the second and third antenna elements are fed to operate the second and third antenna elements as the antenna. 6. A housing case into which the first, second, and third antenna elements are pushed and pulled out, wherein the antenna device is configured to push the first, second, and third antenna elements when the first, second, and third antenna elements are pushed in. Only the second and third antenna elements are pushed into the housing case, and when the first, second, and third antenna elements are pulled out, the first and second antenna elements are pulled out of the housing case. The portable wireless device according to claim 5, wherein: 7. The portable wireless device according to claim 6, wherein said second antenna element is a rod-shaped rod antenna. 8. The antenna device according to claim 1, further comprising storage means for storing the balance-unbalance conversion means, and for pushing and pulling the first, second and third antenna elements through the inside. Claim 7
The portable radio described in 1.