CN107123857B

CN107123857B - Antenna device and receiving device

Info

Publication number: CN107123857B
Application number: CN201610875881.0A
Authority: CN
Inventors: 吉野功高; 坪井觉
Original assignee: Sony Semiconductor Solutions Corp
Current assignee: Sony Semiconductor Solutions Corp
Priority date: 2010-02-19
Filing date: 2011-02-10
Publication date: 2020-10-20
Anticipated expiration: 2031-02-10
Also published as: CN102163765A; BRPI1100809A8; JP5682119B2; BRPI1100809A2; CN107123857A; JP2011172125A

Abstract

An antenna device and a receiving device. The antenna device includes: a plug for audio signals, including a plurality of terminals; and an audio signal transmission cable including a plurality of wires, the audio signal transmission cable being configured to transmit an audio signal once one end thereof is connected to the audio signal plug. A high-frequency cutoff unit having a high-frequency cutoff function is connected at least to a second terminal, which is different from the first terminal and is connected to a second line of the audio signal transmission cable, which is different from the first line of the audio signal transmission cable, among the plurality of terminals of the plug for audio signals. In one end of the audio signal transmission cable and the other end of the audio signal transmission cable, a relay unit is provided at least one end of the audio signal transmission cable.

Description

Antenna device and receiving device

The patent application of the invention is a divisional application of an invention patent application with the application number of 201110035861X and the name of 'an antenna device and a receiving device', which is filed on 10.02.2011.

Technical Field

The present invention relates to an antenna device usable in a mobile electronic apparatus such as a mobile audio/video (AV) apparatus or a mobile phone and to a receiving device including the antenna device.

Background

With the increase in screen size and performance of mobile electronic devices and the miniaturization and thinning of Television (TV) tuners, mobile electronic device terminals that allow TV viewing on receiving terminals have become popular.

In recent years, electronic devices such as communication terminals (e.g., mobile phones) having a function of receiving Frequency Modulation (FM) radio broadcasts, digital radio broadcasts, or digital television broadcasts are increasingly being utilized.

Such electronic devices allow a user to listen to audio using an earphone (or headphone) through an earphone cable using a coaxial cable.

Electronic devices with television receivers, such as mobile phones, allow users to listen to audio using headphones. Further, in such an electronic apparatus, a cable for the earphone is formed of a shielded cable and serves as a receiving antenna, which is also used for transmission of high-frequency signals.

For example, earphone antennas disclosed in japanese patent nos. 4003671 and 4123262.

Disclosure of Invention

The above-described earphone antenna is generally used as an antenna for receiving FM broadcast waves or one-band broadcasts using an earphone cable (having a plug with a diameter of 3.5mm or 2.5 mm).

However, the use of a tubular terminal of a polar cable having a diameter of 3.5mm or 2.5mm causes disadvantages such as an increase in high-frequency coupling and a significant deterioration in antenna gain.

Accordingly, it is desirable to provide an antenna device and a receiving device having high receiving performance and reduced terminal coupling unit loss.

An antenna device according to a first embodiment of the present invention includes: a plug for audio signals, including a plurality of terminals; and an audio signal transmission cable including a plurality of wires, the audio signal transmission cable being configured to transmit an audio signal once one end thereof is connected to the audio signal plug. Wherein an antenna signal line is formed by connecting a first terminal of the plurality of terminals of the plug for an audio signal and a first line of the audio signal transmission cable to each other, and wherein a high-frequency cutoff unit having a high-frequency cutoff function is connected at least to a second terminal of the plurality of terminals of the plug for an audio signal, the second terminal being different from the first terminal and being connected to a second line of the audio signal transmission cable, the second line being different from the first line of the audio signal transmission cable, wherein a relay unit is provided at least one end of the audio signal transmission cable in one end of the audio signal transmission cable and the other end of the audio signal transmission cable.

A receiving apparatus according to a second embodiment of the present invention includes: an antenna device; and an electronic device connectable to the antenna device, the electronic device having a function of receiving a broadcast wave. The antenna device includes: a plug for audio signals, including a plurality of terminals; and an audio signal transmission cable including a plurality of wires, the audio signal transmission cable being configured to transmit an audio signal once one end thereof is connected to the audio signal plug. Wherein an antenna signal line is formed by connecting a first terminal of the plurality of terminals of the plug for an audio signal and a first line of the audio signal transmission cable to each other, and wherein a high-frequency cutoff unit having a high-frequency cutoff function is connected at least to a second terminal of the plurality of terminals of the plug for an audio signal, the second terminal being different from the first terminal and being connected to a second line of the audio signal transmission cable, the second line being different from the first line of the audio signal transmission cable, wherein a relay unit is provided at least one end of the audio signal transmission cable in one end of the audio signal transmission cable and the other end of the audio signal transmission cable.

According to the embodiments of the present invention, the loss in the terminal coupling unit can be reduced, and high reception performance can be achieved.

Drawings

Fig. 1 is a diagram showing a receiving system (receiving apparatus) including a mobile terminal as an example of an electronic device (television apparatus) including an antenna cable forming a wire apparatus according to a first embodiment of the present invention;

fig. 2 is a diagram showing an equivalent circuit of a receiving system according to a first embodiment of the present invention;

fig. 3 is a diagram showing an equivalent circuit of a coaxial cable with a shield portion and a plug connector including a relay substrate forming an antenna cable according to the embodiment;

fig. 4 is a diagram showing an example structure of a coaxial cable having a shield portion;

fig. 5 is a diagram showing an example structure of a mounting substrate of the relay unit according to the embodiment;

fig. 6A and 6B are diagrams showing an example of mounting a three-pole jack unit on a substrate in a mobile terminal (electronic apparatus);

fig. 7A to 7D are diagrams showing first peak gain characteristics with respect to the frequency of a receiving device in the case where a three-pole jack unit is mounted on a substrate in a mobile terminal (electronic apparatus) as in fig. 6A and 6B;

fig. 8A to 8D are diagrams showing the second peak gain characteristic with respect to the frequency of the receiving device in the case where the three-pole jack unit is mounted on the substrate in the mobile terminal (electronic apparatus) as in fig. 6A and 6B;

fig. 9A to 9D are diagrams showing peak gain characteristics with respect to the frequency of a receiving device in the case where a ferrite bead (ferrite bead) serving as a high-frequency cutoff unit is mounted in a plug terminal on a mounting substrate of a relay unit of an antenna cable and in the case where the ferrite bead is not mounted;

fig. 10A and 10B are diagrams showing peak gain characteristics with respect to the frequency of the VHF band receiving apparatus when the earphone cable is connected to the antenna cable;

fig. 11 is a diagram showing an equivalent circuit of a receiving system according to a second embodiment of the present invention;

fig. 12 is a diagram showing an equivalent circuit of a receiving system according to a third embodiment of the present invention;

fig. 13 is a diagram showing an equivalent circuit of a receiving system according to a fourth embodiment of the present invention;

fig. 14A to 14D are diagrams showing peak gain characteristics with respect to frequencies of VHF and UHF-band receiving devices when an antenna cable is not used to connect an earphone cable;

fig. 15 is a diagram showing an equivalent circuit of a receiving system according to a fifth embodiment of the present invention; and

fig. 16 is a diagram showing an equivalent circuit of a receiving system according to a sixth embodiment of the present invention.

Detailed Description

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

The description will be given in the following order:

1. first embodiment (first example configuration of a receiving system (receiving apparatus))

2. Second embodiment (second example configuration of a receiving system (receiving apparatus))

3. Third embodiment (third example configuration of a receiving system (receiving apparatus))

4. Fourth embodiment (fourth example configuration of a receiving system (receiving apparatus))

5. Fifth embodiment (fifth example configuration of receiver system (receiver device))

6. Sixth embodiment (sixth example configuration of a receiving system (receiving apparatus))

1. First embodiment

First example structure of receiving system (receiving apparatus)

Fig. 1 is a diagram showing a receiving system (receiving apparatus) including a mobile terminal as an example of an electronic device (television device) including an antenna cable forming a wire apparatus according to a first embodiment of the present invention.

Fig. 2 is a diagram showing an equivalent circuit of a receiving system according to a first embodiment of the present invention.

Fig. 3 is a diagram showing an equivalent circuit of the coaxial cable with the shield portion and the plug connector including the relay substrate forming the antenna cable according to the embodiment.

The receiving system 10 includes a mobile terminal 20 serving as an electronic device and an antenna apparatus 30 as main components.

For example, the mobile terminal 20 includes a built-in television receiver, an audio system circuit, a display unit 21 such as a liquid crystal display device, and an operation unit for performing key input, and the like.

The mobile terminal 20 includes a circular jack unit 22 connected with a three-pole plug 40 of the antenna device 30 to receive a high-frequency signal, and other appropriate devices.

The structure of the circular jack unit 22 will be described in detail below.

The antenna device 30 according to this embodiment is capable of receiving and transmitting, for example, FM signals transmitted from a broadcasting station or Very High Frequency (VHF) and Ultra High Frequency (UHF) radio signals for receiving digital television broadcasts.

The antenna device 30 may be mainly formed of a three-pole plug 40 for audio signals and an audio signal transmission cable 50, and the mobile terminal 20 serving as an electronic apparatus has a jack unit.

In the first embodiment, the audio signal transmission cable 50 may be formed of an antenna cable 60 and an earphone cable 70.

The antenna cable 60 has a coaxial cable 61 including a shield portion, and the three-pole plug 40 having a diameter of 3.5mm is connected to one end of the coaxial cable 61 via a relay unit. A three-stage jack 63 having a diameter of 3.5mm is connected to the other end of the coaxial cable 61.

Caps

64 and 65 are respectively arranged outside the connector of the three-pole plug 40 using the relay substrate and the portion forming the three-pole jack 63.

Example Structure of three-pole plug

The three-pole plug 40 has a tubular front end portion 41 inserted into the jack unit 22, and the front end portion 41 has a left channel (Lch) terminal 411 for a stereoscopic audio signal, a right channel (Rch) terminal 412 for a stereoscopic audio signal, and a Ground (GND) terminal 413 in this order from the top end side in such a manner that the

terminals

411, 412, and 413 are isolated from each other.

The three-pole plug 40 also has a tubular rear end portion 42 connected to one end (side) of the antenna cable 60, and the rear end portion 42 has a ground terminal 421, an Rch terminal 422, and an Lch terminal 423 in this order from the center side in such a manner that the

terminals

421, 422, and 423 are isolated from each other.

In the three-pole plug 40, the Lch terminal 411 in the front end portion 41 and the Lch terminal 423 in the rear end portion 42 are electrically connected to each other within the tubular shaft.

The Rch terminal 412 in the front end portion 41 and the Rch terminal 422 in the rear end portion 42 are electrically connected to each other within the tubular shaft.

The GND terminal 413 in the front end portion 41 and the GND terminal 421 in the rear end portion 42 are electrically connected to each other within the tubular shaft.

The antenna cable 60 includes a coaxial cable 61, a relay unit 62 provided at one end of the coaxial cable 61, and a three-pole jack 63 formed at the other end of the coaxial cable 61.

The relay unit 62 is covered with a cap 64, and the three-pole jack 63 is covered with a cap 65.

The coaxial cable 61 includes a plurality of wires. The three-pole plug 40 is connected to the relay unit 62 on one end side of the coaxial cable 61, and the earphone cable 70 is formed on the other end side so as to be connectable to the other end of the coaxial cable 61 via the three-pole jack 63.

The coaxial cable 61 may be formed of, for example, a coaxial cable having a shield portion (covered with a sheath).

Example Structure of antenna Cable (example Structure of coaxial Cable with Shield)

Fig. 4 is a diagram showing an example structure of a coaxial cable having a shield portion.

The coaxial cable 61 with a shield shown in fig. 4 is formed of a three-core coaxial cable 610.

The three-core coaxial cable 610 includes a plurality of

core wires

611, 612, and 613 forming a right audio (R) line, a left audio (L) line, and a GND line, respectively, and an inner insulator 614 for insulating the

core wires

611, 612, and 613 from each other.

The coaxial cable 610 has a shield portion 615 serving as an outer conductor provided along the outer periphery of the insulator 614 and an outer insulator (outer layer, sheath) 616 which may be made of an elastomer or the like and covers the entire outer periphery of the coaxial cable 610.

Core wires

611 and 612 forming the R line and the L line, respectively, correspond to the second line, and core wire 613 forming the GND line corresponds to the first line.

For example, the

core wires

611, 612, and 613 may be polyurethane wires including aramid fibers.

For example, the insulator 614 may be formed of cross-linked Polyethylene (PE) irradiated with X-rays.

Further, for example, the shield 615 may be formed of annealed copper wire.

Further, the shield portion 615 is formed of a plurality of wires, and is formed using, for example, a braided shield (braided shield) obtained by braiding a bare annealed copper wire.

Braided shields are generally an electrostatic shielding method that allows for a smaller amount of gap to be created between the shields than does a shielded shield (shielded shield) even when the cable is bent and provides the desired flexibility, flex life, and mechanical strength.

The

core wires

611, 612, and 613 and the shield portion 615 have impedance with respect to high frequency.

Example Structure of Relay Unit

Next, an example structure of the relay unit 62 will be described.

Fig. 2 is a diagram showing a specific structure of the relay unit according to this embodiment and an example in which the audio signal transmission cable is connected to the coaxial cable.

For example, the relay unit 62 may be formed using a substrate or a mold.

On one end side of the relay unit 62, the insulator 614, the shield 615, and the sheath 616 are removed from the coaxial cable 610 so that the

core wires

611, 612, and 613 are exposed.

Further, in the vicinity of the relay unit 62, the sheath 616 is removed so that the shield portion 615 is exposed.

On the other end side of the relay unit 62, the rear end portion 42 of the three-pole plug 40 is arranged to face the ends of the

core wires

611, 612, and 613 on the one end side of the coaxial cable 610.

For example, in the relay unit 62, a high-frequency cutoff unit 621 having a high-frequency cutoff function and formed of an inductor L1 and a ferrite bead FB1 is connected to the Rch terminal 422 in the rear end portion 42 of the three-pole plug 40.

The Rch terminal 422 in the rear end portion 42 of the three-pole plug 40 is connected to the core wire 611(Rch wire) of the coaxial cable 610 via a high-frequency cutoff unit 621.

For example, in the relay unit 62, a high-frequency cutoff unit 622 having a high-frequency cutoff function and formed of an inductor L2 and a ferrite bead FB2 is connected to the Lch terminal 423 in the rear end portion 42 of the three-pole plug 40.

The Lch terminal 423 in the rear end portion 42 of the three-pole plug 40 is connected to the core wire 612(Lch wire) of the coaxial cable 610 via a high-frequency cutoff unit 622.

In the relay unit 62, the GND terminal 421 in the rear end portion 42 of the three-pole plug 40 is connected to the core wire 613(GND wire) of the coaxial cable 610, and the connected portion is connected to the shield portion 615 of the coaxial cable 610.

Thereby, the antenna signal line LANT is formed.

High-

frequency cutoff units

621 and 622 for high-frequency cutoff are installed on the Rch audio line and the Lch audio line to show low impedance in the audio band and high impedance in the high-frequency region (for example, in the VHF or higher band).

Fig. 5 is a diagram showing an example structure of a mounting substrate of the relay unit according to this embodiment.

The mounting substrate 80 may be shaped into a rectangle having a length of 16.1mm and a width of 5.5 mm. The mounting substrate 80 has at one end in its longitudinal direction a plug receiving region 81 for receiving the rear end portion 42 of the three-pole plug 40 having a diameter of 3.5 mm.

In the illustrated example, the rear end 42 of the three-pole plug 40 may be approximately 7.5mm in length.

A GND terminal 82 accommodated near the accommodation end and connected to the GND terminal 421 of the three-pole plug 40 is formed around the plug accommodation region 81.

An R terminal 83 connected to the Rch terminal 422 is formed in an intermediate portion of the plug housing region 81 near the front end in the longitudinal direction.

An L terminal 84 connected to the Lch terminal 423 is formed in a front end portion in the longitudinal direction of the plug accommodating area 81.

The mounting substrate 80 has

connection terminals

85, 86, and 87 at the other end in the longitudinal direction thereof, to which the

core wires

611, 612, and 613 of the coaxial cable 610 are connected by soldering or the like.

The ferrite bead FB1 of the high-frequency cutoff unit 621 is mounted between the terminal 83 and the position where the connection terminal 85 is provided.

The ferrite bead FB2 of the high-frequency cutoff unit 622 is mounted between the terminal 84 and the position where the connection terminal 86 is provided.

The

terminals

82 and 87 are connected to each other via a connection wiring LW 1. The terminal 83 and the ferrite bead FB1 are connected to each other via a connection wire LW 2. The terminal 84 and the ferrite bead FB2 are connected to each other via a connection wire LW 3.

The ferrite bead FB1 and the connection terminal 85 are connected to each other via a connection wire LW 4. The ferrite bead FB2 and the connection terminal 86 are connected to each other via a connection wire LW 5.

The mounting substrate 80 has a structure serving as an antenna in which the

terminals

421, 422, and 423 in the rear end portion 42 of the three-pole plug 40 are connected to the

terminals

82, 83, and 84 corresponding to the plug terminals by welding.

Example Structure of tripolar Jack for antenna Cable

As shown in fig. 2 and 3, the three-pole jack 63 includes an Rch terminal 631, an Lch terminal 632, and a GND terminal 633.

In the vicinity of the three-pole jack 63, the insulator 614, the shield 615, and the sheath 616 are removed at the other end of the coaxial cable 610, so that the

core wires

611, 612, and 613 are exposed. Further, in the vicinity of the three-pole jack 63, the sheath 616 is removed, so that the shield portion 615 is exposed.

The Rch terminal 631 is connected to the core 611, the Lch terminal 632 is connected to the core 612, and the GND terminal 633 is connected to the core 613.

In fig. 2 and 3, the plug insertion opening 634 is shown.

Example Structure of earphone Cable

The earphone cable 70 has a branch at its one end connected to the Rch earphone 71 and the Lch earphone 72. A three-pole plug 73 having a diameter of 3.5mm is connected to the other end of the earphone cable 70.

The three-pole plug 73 is configured such that a tubular front end portion of the three-pole plug 73 is inserted into and connected to the three-pole insertion hole 63 of the antenna cable 60, and has an Rch terminal 731, an Lch terminal 732, and a GND terminal 733.

The Rch terminal 731 is connected to the earphone 71 using the Rch line 734, the Lch terminal 732 is connected to the earphone 72 using the Lch line 735, and the GND terminal 733 is connected to the GND lines 736 and 737.

Example structure of three-pole jack unit of mobile terminal (electronic apparatus)

As shown in fig. 2, the three-pole jack unit 22 formed in the mobile terminal 20 has a three-pole jack 221 and outlet units (outlet units) 222, 223, and 224.

The drawing unit 222 is connected to an Rch terminal TR of the triple-pole jack 221 to supply an Rch audio signal to a signal processing system (not shown).

A high-frequency cutoff unit 225 formed of an inductor L, a ferrite bead FB, and any other suitable element for high-frequency cutoff is inserted (connected) to the drawing unit 222.

The lead-out unit 223 is connected to the Lch terminal TL of the triple-pole jack 221 to supply an Lch audio signal to a signal processing system (not shown).

A high-frequency cutoff unit 226 formed of an inductor L, a ferrite bead FB, and any other suitable element for high-frequency cutoff is inserted (connected) to the lead-out unit 223.

The drawing unit 224 is connected to the GND terminal TG of the three-pole jack 221, and is connected to a television ground.

A high-frequency cutoff unit 227 for high-frequency cutoff formed of an inductor L, a ferrite bead FB, and any other suitable element is inserted (connected) to the lead-out unit 224.

The tap unit 224 is split into a first branch LB1 and a second branch LB 2. The high frequency cutoff unit 227 is connected to the first branch line LB 1. The second branch LB2 forms an antenna signal line LAMT. The capacitor C221 is connected to the second branch line LB2, and the second branch line LB2 is further connected to the tuner 23 via the capacitor C221.

Fig. 6A and 6B are diagrams illustrating an example of mounting a three-pole jack unit on a substrate of a mobile terminal (electronic apparatus).

Fig. 6A shows an example of forming (in the case of forming a back surface pattern) GND lines and signal lines (wires) on the back surface (mounting surface) of the area of the substrate 24 where the jack unit 22 is mounted.

Fig. 6B shows an example in which a region (non-conductive region) 241 having no GND line or signal line is formed on the back surface (mounting surface) of the region in which the jack unit 22 is mounted (in the case where the back surface pattern is not formed).

Fig. 7A and 7B are diagrams showing the first peak gain characteristic with respect to the frequency of the receiving device in the case where the three-pole jack unit is mounted on the substrate of the mobile terminal (electronic apparatus) as shown in fig. 6A and 6B.

Fig. 8A and 8B are diagrams showing the second peak gain characteristic with respect to the frequency of the receiving device in the case where the three-pole jack unit is mounted on the substrate in the mobile terminal (electronic apparatus) as shown in fig. 6A and 6B.

In fig. 7A, 7B, 8A, and 8B, a curve H represents a horizontal polarization (horizontal polarization) characteristic, and a curve V represents a vertical polarization (vertical polarization) characteristic.

In fig. 7C, 7D, 8C, and 8D, tables representing measurement results according to characteristic diagrams are shown in detail.

As shown in fig. 6A and 6B, the illustrated example shows a case where a GND pattern is formed or not formed on the back surface of the jack unit 22 in the case where an earphone having a cord length of 1200mm is attached to the antenna cable 60 and the antenna gain is measured in a dark room when only the antenna cable 60 is used.

Fig. 7A to 7D show the measurement results when the earphone cable 70 is connected, and fig. 8A to 8D show the measurement results when only the antenna cable 60 is used. Further, fig. 7A and 8A show a case where a back surface pattern is formed, and fig. 7B and 8B show a case where a back surface pattern is not formed.

As can be seen from fig. 7A to 7D and fig. 8A to 8D, when the conductive portion such as the GND pattern is not formed on the mounting face (back face) of the area where the jack unit 22 is provided, more improved performance is obtained than when the conductive portion is formed.

Fig. 9A and 9B are diagrams showing peak gain characteristics with respect to the frequency of the receiving device in the case where a ferrite bead serving as a high-frequency cutoff unit is mounted in a plug terminal on a mounting substrate of the relay unit 62 of the antenna cable and in the case where no ferrite bead is mounted.

Fig. 9A shows the measurement result in the case where the ferrite bead serving as the high-frequency cutoff unit is mounted, and fig. 9B shows the measurement result in the case where the ferrite bead serving as the high-frequency cutoff unit is not mounted.

In fig. 9A and 9B, a curve H represents the horizontal polarization characteristic, and a curve V represents the vertical polarization characteristic.

In fig. 9C and 9D, tables representing measurement results according to the characteristic diagrams are shown in detail.

As can be seen from fig. 9A to 9D, when the high-frequency cutoff unit is not connected to the plug terminal, the characteristics are greatly deteriorated, and when the high-frequency cutoff unit is connected to the plug terminal, good characteristics are obtained.

Fig. 10A is a graph showing peak gain characteristics with respect to the frequency of the VHF band receiving apparatus when the earphone cable is connected to the antenna cable.

In fig. 10A, a curve H represents the horizontal polarization characteristic, and a curve V represents the vertical polarization characteristic.

In fig. 10B, a table representing the measurement results according to the characteristic diagram is shown in detail.

As can be seen from fig. 10A and 10B, by using the antenna device including the antenna cable and the earphone cable according to the embodiment, signals in the high frequency band and the low frequency band of VHF can be received. 2. Second embodiment

Second example structure of receiving system (receiving apparatus)

Fig. 11 is a diagram showing an equivalent circuit of a receiving system according to a second embodiment of the present invention.

The receiving system 10A according to the second embodiment differs from the receiving system 10 according to the first embodiment in that, in the antenna device 30A, the antenna cable 60A and the earphone cable 70A are integrally connected together instead of being connected to each other via a plug connection.

The other structure is similar to that in the first embodiment.

According to the second embodiment, advantages similar to those of the first embodiment described above can be achieved.

3. Third embodiment

Third example structure of receiving system (receiving apparatus)

Fig. 12 is a diagram showing an equivalent circuit of a receiving system according to a third embodiment of the present invention.

The reception system 10B according to the third embodiment is different from the reception system 10A according to the second embodiment in that a four-pole plug 40B is used as a plug.

Therefore, the antenna cable 60B uses the four-core coaxial cable 610B.

In fig. 12, a cross-section of a coaxial cable 610B is also shown.

The four-pole plug 40B has a tip portion 41B in which a Microphone (MIC) terminal 414 is provided between the Rch terminal 412 and the GND terminal 413.

The four-pole plug 40B also has a rear end portion 42B in which an MIC terminal 424 is provided between the GND terminal 421 and the Rch terminal 422.

In the relay unit 62B, a high-frequency cutoff unit 623 formed of an inductor L3 and ferrite beads is connected to the MIC terminal 424.

Further, coaxial cable 610B includes a core wire 617 in addition to three-core coaxial cable 610.

One end of the core wire 617 is connected to the high-frequency cutoff unit 623 in the relay unit 62B.

The other end of the core wire 617 is connected to a Microphone (MIC)90, and the MIC 90 is connected to the core wire 613 serving as a GND wire and the GND wire of the earphone cable 70B.

In the jack unit 22B of the mobile terminal (electronic apparatus) 20B, the jack 221B is added with an MIC terminal TM, and the lead-out unit 228 is connected to the MIC terminal TM.

A high-frequency cutoff unit 229 for high-frequency cutoff formed of an inductor L, a ferrite bead FB, and any other suitable element is inserted (connected) into the lead-out unit 228.

The other structure is similar to that of the second embodiment.

According to the third embodiment, advantages similar to those of the first and second embodiments described above can be achieved.

4. Fourth embodiment

Fourth example structure of receiving system (receiving apparatus)

Fig. 13 is a diagram showing an equivalent circuit of a receiving system according to a fourth embodiment of the present invention.

The reception system 10C according to the fourth embodiment is different from the reception system 10A according to the second embodiment in that, in the antenna device 30C, the earphone cable 70 is connected to the three-pole plug 40 via the relay unit 62C without using an antenna cable.

Fig. 14A and 14B are diagrams showing peak gain characteristics with respect to frequencies of VHF and UHF-band receiving devices when an antenna cable is not used to connect an earphone cable.

In fig. 14A and 14B, a curve H represents the horizontal polarization characteristic, and a curve V represents the vertical polarization characteristic.

In fig. 14C and 14D, tables representing measurement results according to the characteristic diagrams are shown in detail.

Fig. 14A and 14C show the characteristics of the VHF band, and fig. 14B and 14D show the characteristics of the UHF band.

As can be seen from fig. 10A and 10B, in the case of using the antenna device including the antenna cable and the earphone cable, signals in the high frequency band and the low frequency band of VHF can be received.

In contrast, even in the case where only the ordinary earphone cable is used, as can be seen from the measurement results of the antenna gain shown in fig. 14A to 14D, although the characteristics of the UHF band are better for using the antenna cable, substantially equivalent characteristics can be obtained for the VHF band. Therefore, an antenna device having a receiving performance can be realized to some extent.

5. Fifth embodiment

Fifth example configuration of receiver system (receiver apparatus)

Fig. 15 is a diagram showing an equivalent circuit of a receiving system according to a fifth embodiment of the present invention.

The reception system 10D according to the fifth embodiment is different from the reception system 10A according to the second embodiment in that:

the GND line 613D serving as the first line is formed by a coaxial cable 610D, and an Rch line 611D and an Lch line 612D for audio signals serving as the second line on the outside are provided in parallel with the coaxial cable 610D.

In the relay unit 62D, similarly to the second embodiment, the Rch line 611D is connected to the plug terminal 422 via the high-frequency cutoff unit 621, and the Lch line 612D is connected to the plug terminal 423 via the high-frequency cutoff unit 622.

In the relay unit 62D, the GND line 613D serving as the core wire of the coaxial cable 610D, the shield portion 615, and the GND terminal 421 of the plug 40 are connected to each other, thereby forming the antenna signal line LANT.

Further, in the relay unit 62D, capacitors C621 and C622 are formed between the antenna signal line LANT and the Rch line 611D and between the antenna signal line LANT and the Lch line 612D, respectively.

In this embodiment, a capacitor is provided. Therefore, the antenna characteristics can be improved.

At the other end of the antenna cable 60D, a relay unit 100 formed using a substrate or a mold is provided.

In the relay unit 100, the other end of the core wire 613D of the coaxial cable 610D is connected to the GND lines 736 and 737 of the earphone cable 70 via the wiring 101.

Further, high-

frequency cutoff units

102 and 103 each formed of an inductor and a ferrite bead and having a high-frequency cutoff function are connected to the other ends of the

signal lines

611D and 612D, respectively.

The high-frequency cutoff unit 102 is connected to an Rch line 734 of the earphone cable 70 via a wiring 104, and the high-frequency cutoff unit 103 is connected to an Lch line 735 of the earphone cable 70 via a wiring 105.

The fifth embodiment having the above-described structure can also achieve advantages similar to those of the above-described embodiments.

6. Sixth embodiment

Sixth example structure of receiving system (receiving apparatus)

The reception system 10E according to the sixth embodiment is different from the reception system 10B according to the third embodiment in that:

the GND line 613E serving as the first line is formed by the coaxial cable 610E, and the MIC line 617E on the outside and the Rch line 611E and Lch line 612E for audio signals serving as the second line are arranged in parallel with the coaxial cable 610E.

In the relay unit 62E, similarly to the third embodiment, the Rch line 611E is connected to the plug terminal 422 via the high-frequency cutoff unit 621, and the Lch line 612E is connected to the plug terminal 423 via the high-frequency cutoff unit 622. Further, the MIC line 617E is connected to the plug terminal 424 via the high-frequency cutoff unit 623.

In the relay unit 62E, the GND line 613E serving as the core wire of the coaxial cable 610E, the shield portion 615, and the GND terminal 421 of the plug 40B are connected to each other, thereby forming the antenna signal line LANT.

Further, in the relay unit 62E, capacitors C621, C622, and C623 are formed between the antenna signal line LANT and the Rch line 611E, between the antenna signal line LANT and the Lch line 612E, and between the antenna signal line LANT and the MIC line 617E, respectively.

In this embodiment, a capacitor is provided.

At the other end of the antenna cable 60E, a relay unit 100E formed using a substrate or a mold is provided.

In the relay unit 100E, the other end of the core wire 613E of the coaxial cable 610E is connected to the

GND wires

736 and 737 of the earphone cable 70 via the wiring 101E.

Further, high-

frequency cutoff units

102E, 103E, and 106E each formed of an inductor and a ferrite bead and having a high-frequency cutoff function are connected to the other ends of the

signal lines

611E, 612E, and 617E, respectively.

The high-frequency cutoff unit 102E is connected to the Rch line 734 of the headphone 70 via a wiring 104E, and the high-frequency cutoff unit 103E is connected to the Lch line 735 of the headphone 70 via a wiring 105E.

The high-frequency cutoff unit 106E is connected to the MIC 90, and the MIC 90 is connected to the wiring 101E and

GND lines

736 and 737 of the earphone cable 70 via the wiring 107E.

The sixth embodiment having the above-described structure can also achieve advantages similar to those of the above-described embodiments.

As described above, according to the illustrated embodiment, an antenna for receiving VHF and UHF signals having high receiving performance and reduced loss in a coupling unit can be implemented using a plug and a jack having a diameter of 3.5mm, 2.5mm, etc., which are commonly used in standard audio systems.

In the antenna cable, the transmission cable portion connected to the relay unit does not necessarily have a coaxial structure, but may be formed of two lines in parallel.

Further, the high-frequency cutoff unit may also be formed by winding the cable section around a magnetic material.

This application contains subject matter relating to japanese priority patent application JP2010-035430 filed on day 2/19/2010 to the office of the present patent, the entire contents of which are incorporated herein by reference.

It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and changes may be made in accordance with design requirements and other factors, which are within the scope of the appended claims or their equivalents.

Claims

1. An antenna device, comprising:

a plug for audio signals, including a plurality of terminals; and

an audio signal transmission cable including a plurality of wires, the audio signal transmission cable configured to transmit an audio signal once one end thereof is connected to the audio signal plug,

wherein an antenna signal line is formed by connecting a first terminal of the plurality of terminals of the audio-signal plug and a first line of the audio-signal transmission cable to each other, and

wherein a high-frequency cutoff unit having a high-frequency cutoff function is connected to at least a second terminal of the plurality of terminals of the plug for audio signal, the second terminal being different from the first terminal and being connected to a second line of the audio signal transmission cable, the second line being different from the first line of the audio signal transmission cable,

wherein a relay unit is provided at least one end of the audio signal transmission cable among one end of the audio signal transmission cable and the other end of the audio signal transmission cable;

wherein the audio signal transmission cable includes a coaxial cable having a shield portion, the coaxial cable covered by a sheath serves as an antenna cable, and

wherein the shield portion is connected to the first terminal of the plug for audio signals and the first wire of the audio signal transmission cable at one end of the coaxial cable;

wherein the coaxial cable includes a plurality of core wires.

2. The antenna device according to claim 1, wherein the relay unit includes at least a connection line, the high-frequency cutoff unit, and a connection terminal connected to each of the plurality of terminals of the plug for audio signals.

3. The antenna device according to claim 1, wherein the plug for audio signals has a tubular front end portion having a left channel terminal, a right channel terminal, and a ground terminal, and a tubular rear end portion having a left channel terminal, a right channel terminal, and a ground terminal; wherein

The left channel terminal, the right channel terminal, and the ground terminal are isolated from each other; and wherein

The left channel terminal in the front end portion and the left channel terminal in the rear end portion are electrically connected to each other,

the right channel terminal in the front end portion and the right channel terminal in the rear end portion are electrically connected to each other, an

The ground terminal in the front end portion and the ground terminal in the rear end portion are electrically connected to each other.

4. The antenna device according to claim 1, wherein the plurality of core wires include wires forming a right audio wire, a left audio wire, and a ground wire.

5. The antenna device according to claim 1, wherein the second wire is connected at one end thereof to the second terminal of the plug for audio signals through the high-frequency cutoff unit.

6. The antenna device according to claim 1, wherein the plurality of terminals of the plug for audio signals include microphone terminals, and the coaxial cable includes a wire forming a microphone line.

7. The antenna device according to claim 1, wherein the plug for audio signal includes a plug terminal that is shared as the antenna signal line, and

wherein the plug terminal and the first line of the audio signal transmission cable include a ground of the audio signal line.

8. The antenna device according to claim 1, wherein a capacitor is formed between the antenna signal line and one end of the second line at one end of the coaxial cable, the shield being connected to the antenna signal line.

9. The antenna device according to any one of claims 3 to 8, wherein the relay unit has a mounting substrate, and the mounting substrate has a plug housing area at one end in the longitudinal direction for a rear end portion of the plug for audio signals.

10. A receiving apparatus, comprising:

an antenna device; and

an electronic device connectable to the antenna device, the electronic device having a function of receiving a broadcast wave,

the antenna device includes:

a plug for audio signals, including a plurality of terminals; and

the audio signal transmission cable includes a coaxial cable having a shield portion, the coaxial cable being covered with a sheath to function as an antenna cable, and

wherein the coaxial cable includes a plurality of core wires.

11. The receiving device according to claim 10, wherein the electronic equipment includes a jack unit configured to be connected to the plug for audio signals of the antenna device, and

wherein the jack unit is mounted on a substrate, and a portion of the substrate including a rear surface of the jack unit has at least a mounting surface formed as a non-conductive region.

12. The receiving device of claim 11, wherein the jack unit includes a plurality of lead-out units, and

wherein a high-frequency cutoff unit having a high-frequency cutoff function is connected to at least a second lead-out unit of the plurality of lead-out units, the second lead-out unit being different from a first lead-out unit of the plurality of lead-out units, the first lead-out unit being configured to form an antenna signal line by being connected to the plug for audio signals.

13. The receiving device according to claim 12, wherein the first drawing unit has a branch portion,

wherein one branch portion is connected to the high-frequency cutoff unit, and

wherein the other branch portion is connected to the capacitor.

14. The receiving apparatus according to any one of claims 10 to 13, wherein the relay unit includes at least a connection line, the high-frequency cutoff unit, and a connection terminal connected to each of the plurality of terminals of the plug for audio signals.

15. The receiving device according to claim 10, wherein the plug for audio signals has a tubular front end portion having a left channel terminal, a right channel terminal, and a ground terminal, and a tubular rear end portion having a left channel terminal, a right channel terminal, and a ground terminal; wherein

16. The receiving apparatus according to claim 15, wherein the relay unit includes at least a connection line, the high-frequency cutoff unit, and a connection terminal connected to each of the plurality of terminals of the plug for audio signals.

17. The reception apparatus according to claim 10, wherein the plurality of core lines include lines forming a right audio line, a left audio line, and a ground line.

18. The receiving apparatus according to claim 10, wherein the second wire is connected at one end thereof to the second terminal of the plug for audio signals through the high-frequency cutoff unit.

19. The reception apparatus according to claim 10, wherein the plurality of terminals of the plug for audio signals include microphone terminals, and the coaxial cable includes a wire forming a microphone line.

20. The reception apparatus according to claim 10, wherein the plug for audio signals includes a plug terminal that is shared as the antenna signal line, and

wherein the plug terminal and the first line of the audio signal transmission cable include a ground line of an audio signal line.

21. The reception apparatus according to claim 10, wherein a capacitor is formed between the antenna signal line and one end of the second line at one end of the coaxial cable, the shield being connected to the antenna signal line.

22. The receiving device according to claim 15, wherein the relay unit has a mounting substrate, and the mounting substrate has a plug housing area at one end in the longitudinal direction for the rear end portion of the plug for audio signals.