JP4929799B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device for receiving a broadcast wave, and more particularly to an antenna device for receiving terrestrial digital broadcasting with a portable device.

  More particularly, the present invention relates to an antenna device that is installed in a portable device and solves the problem of accommodation space when not in use, and more particularly, to an antenna device that is equipped in a portable device and has excellent impact resistance and safety. .

  From December 1, 2003, terrestrial digital broadcasting services using the terrestrial UHF band (470 MHz to 890 MHz) were started in the three large areas of Kanto, Kinki, and Chukyo. In terrestrial digital broadcasting, in addition to digital high-definition high-quality and high-quality sound programs, interactive programs can be provided. Digital terrestrial television broadcasting can be received with a UHF antenna, and can be received and viewed neatly without flickering even on a television set on a running train or bus. In addition, a service for receiving and viewing simple moving images, data broadcasting, and audio broadcasting with a portable information terminal or the like is also planned (for example, see Non-Patent Document 1).

  Here, a rod-shaped monopole antenna is generally used as a receiving antenna for portable devices. The monopole antenna is half the length (ie, λ / 4) compared to the dipole antenna and can be configured to be relatively small. A monopole antenna, in principle, requires an infinitely wide conductor plate, but is replaced by a very narrow conductor plate in a portable device, and is also called a “rod antenna” or “whipped antenna”. The radiation field on the top surface of the conductor is equal to the directivity of the dipole antenna.

  In small portable television receivers and radio receivers, rod antennas with a telescopic structure are widely known. When they are extended, they can exhibit their performance, and when they are contracted, they are compact and convenient.

  For example, the planar antenna feed pin is composed of a telescopic rod antenna, and the circular antenna and linearly polarized wave are separated by electrical connection / separation between the rod antenna lead conductor and the planar antenna patch conductor. Proposals have been made on an antenna device that enables operation as an antenna (see, for example, Patent Document 1).

  As another configuration example of a rod antenna, a “helical antenna” in which an antenna wire is wound around a rod in a spiral shape is known. An antenna using a conductive wire that is longer than the wavelength has a wide band, but a helical antenna can be miniaturized while maintaining a wide band by a winding structure. In addition, when a flexible soft material is used for the core rod, the flexible antenna is hard to break and has flexibility (safety).

  For example, a digital audio broadcasting antenna element, a GPS antenna element, and a helical antenna element are arranged on the same circuit board, and the signal received by each antenna element is output via a common cable. Thus, there has been proposed an antenna device that reduces the number of components for receiving signals from digital audio broadcasting satellites, GPS satellites, and terrestrial radio broadcasting stations, and reduces costs (for example, see Patent Document 2). See

  Terrestrial digital broadcasting is a broadcasting system that divides a 6 megahertz band into 13 segments and sends video, audio, and data for mobile phones and mobile terminals using only one middle segment. The reception service, “One Seg” is scheduled to start on Saturday, April 1, 2006, and is attracting attention. The 1Seg program service is basically the same as a program for ordinary TV receivers distributed using 12 segments, and you can usually enjoy popular programs that you are familiar with on home TVs on the go. it can. As receiving terminals, a wide variety of receivers such as car navigation systems, personal computers, and dedicated portable TVs are expected to appear in addition to mobile phones.

  The present inventors consider that the configuration method of a receiving antenna becomes one important technical problem in spreading the use of terrestrial digital broadcasting in portable devices.

  First, there is a problem of an antenna accommodation space when the broadcast receiving function is not used. In a place with a strong electric field, a built-in antenna can sufficiently receive a broadcast wave, but an external antenna is required in a weak electric field. The retractable rod antenna becomes compact when retracted, but it is difficult to store it in the portable device body.

  Secondly, the antenna and the device body are exposed to various impacts during transportation and use outside the office, so it is necessary to ensure safety.

  Since the extendable rod antenna lacks flexibility, there is a risk that it can be broken from the base or impacted by a user or an object by applying an impact. In addition, the structure is complicated and the manufacturing cost is high.

  In addition, when the helical antenna is made of a soft and flexible material for the core rod, the helical antenna is hard to break and can have flexibility (safety). However, the helical antenna can be bent freely at any part, but it has disadvantages such as a decrease in gain and deterioration in radiation efficiency. Especially when bending occurs due to vibration, the coil winding interval of the antenna conductor becomes uneven. , Accompanied by impedance change.

JP-A-9-98017 JP 2001-251136 A http: // www. d-pa. org

  An object of the present invention is to provide an excellent antenna device for receiving terrestrial digital broadcasting by a portable device.

  It is a further object of the present invention to provide an excellent antenna device that is installed in a portable device and can solve the problem of accommodation space when not in use.

  A further object of the present invention is to provide an antenna device that is mounted on a portable device and has excellent impact resistance and safety.

The present invention has been made in consideration of the above problems, and is a rod-shaped antenna device,
An electric wire in which a conductor portion made of one or more bare annealed copper wires and acting as an antenna signal line is covered with an insulator, and a rod portion made of a molding material made of an insulator further covering the electric wire;
The rod portion is bent by approximately 135 degrees and includes a base end portion having a multipolar plug,
The antenna signal line is connected to a pin of one of the multipolar plugs, and is detachably attached to a tuner device including a jack via the plug.
This is an antenna device.

  With the start of services for portable devices by digital terrestrial broadcasting, a configuration method of a receiving antenna for portable devices becomes one important technical problem. First, there is a problem of an antenna accommodating space when the broadcast receiving function is not used. In addition, the antenna and the main body of the device are exposed to various impacts during transportation and use outside the office, so it is necessary to ensure safety.

  A rod antenna configured by applying the present invention forms a rod portion by covering the outside of an electric wire made of a conductor corresponding to an antenna signal line with a molding material. Therefore, it is possible to combine sufficient rigidity to maintain the shape and flexibility to interfere with the impact. For example, it is possible to reduce the cost by using a commercially available soft coaxial wire as the electric wire and integrally molding this to manufacture the rod portion.

  For example, the antenna signal line is connected to a tip pin of the multipolar plug. Frequency characteristics are unlikely to occur in the impedance characteristics due to the tip pin feeding.

  The rod antenna to which the present invention is applied can be detachably attached to a tuner device including a jack via a multipolar plug at the base end. Therefore, since the antenna can be removed from the portable device when the antenna is not used, the problem of the accommodation space is solved. In addition, since this rod antenna is dedicated for reception and does not emit radio waves by itself, the design is not restricted by laws and regulations relating to radio waves when configured to be detachable.

  In a state of being attached to the jack via the multipolar plug at the base end, the plug can be rotated 360 degrees with the longitudinal direction of the plug as the rotation axis (X axis), and directivity can be easily adjusted. When the jack is mounted so that the longitudinal direction of the base end portion is horizontal, the rod portion is inclined by 45 degrees with respect to the horizontal plane, so that horizontal polarization and vertical polarization can be received evenly. And good directivity characteristics can be easily obtained.

  In addition, the rod antenna to which the present invention is applied includes a jack that receives the plug on the antenna side at both ends of the soft coaxial line, and an antenna cable that is provided with a plug that can be attached to the jack on the tuner device side. The antenna can be installed in a free place by extending between the antenna and the portable device body.

  ADVANTAGE OF THE INVENTION According to this invention, the outstanding antenna apparatus for receiving terrestrial digital broadcasting with a portable apparatus can be provided.

  Furthermore, according to the present invention, it is possible to provide an excellent antenna device that is installed in a portable device and can solve the problem of accommodation space when not in use.

  Moreover, according to the present invention, it is possible to provide an antenna device that is mounted on a portable device and has excellent impact resistance and safety.

  According to the present invention, it is possible to realize a detachable rod antenna for terrestrial digital broadcasting, which is low-cost and safe, which is mainly used for portable devices. By adopting a detachable configuration, the problem of accommodation space when not in use is eliminated. In addition, since the antenna device is a reception-only antenna and does not radiate radio waves by itself, the design is not restricted by laws and regulations relating to radio waves when configured to be detachable.

  The rod antenna according to the present invention can be detachably attached to a portable device having a jack for receiving the plug by providing a plug for electrical connection at the base end. In addition, since the base end portion to be attached / detached is constituted by a general-purpose plug, the antenna device at the time of attachment can be rotated 360 degrees with the longitudinal direction of the plug as a rotation axis, and has a rotation mechanism with an easy structure and directivity. Can be easily adjusted.

  In addition, the antenna cable is extended between the antenna and the mobile device body by an antenna cable that includes a jack that accepts the antenna-side plug at both ends of the soft coaxial cable and a plug that can be attached to the jack on the mobile device side. The antenna can be installed anywhere.

  Other objects, features, and advantages of the present invention will become apparent from more detailed description based on embodiments of the present invention described later and the accompanying drawings.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an external configuration of an antenna device according to an embodiment of the present invention. The illustrated antenna device is a λ / 4 wavelength rod antenna designed mainly for receiving the UHF band (470 MHz to 890 MHz) of digital terrestrial broadcasting.

  As shown in the figure, the rod antenna includes a rod-shaped rod portion 1 and a base end portion 2 that is bent by approximately 135 degrees. By providing the multipolar plug 21 for electrical connection at the base end portion 2, it can be detachably attached to a portable device having a jack (described later) for receiving the plug 21. Since the rod antenna according to the present embodiment is dedicated for reception and does not emit radio waves by itself, the design is not restricted by laws and regulations relating to radio waves when configured to be detachable.

  The rod portion 1 has, for example, a total length L1 = 100 mm and a diameter φ = 6.5 mm. Further, the plug 21 at the base end 2 can be a two-pole plug of φ = 3.5 mm widely used for audio. The rod antenna when attached to the jack can be rotated 360 degrees with the longitudinal direction of the plug 21 as the rotation axis (X axis), and the directivity can be easily adjusted. Further, with respect to the Y-axis direction, a play can be provided by providing a bellows structure at the base end 2.

FIG. 2 illustrates the internal configuration of the rod portion 1 of this rod antenna. As shown in the figure, a conductor portion 11 that acts as an antenna signal line by bundling a plurality of bare annealed copper wires, an electric wire 13 made of an elastomer insulator 12 covering the conductor portion 11, and an elastomer that further covers the electric wire 13 It is comprised with the molding material 14 which consists of an insulator. For example, a lead wire equivalent to AWG 22 can be applied to the electric wire 13 . The antenna signal line is connected to the tip of the two-pole plug 21. According to the structure shown in the figure, the electric wire 13 itself has no rigidity, but further, the outer side thereof is covered with the molding material 14 so that both the rigidity sufficient to maintain the shape and the flexibility to interfere with the impact are combined. Can do.

  FIG. 3 shows an example of how the rod antenna according to this embodiment is used. As described above, it can be detachably attached to a portable device having a jack for receiving the plug 21. The rod antenna at the time of mounting can be rotated 360 degrees with the longitudinal direction of the plug 21 as a rotation axis (X axis), and has a rotation mechanism with an easy structure, and directivity can be easily adjusted. .

  Further, as shown in the figure, when the base end portion 2 is mounted so that the longitudinal direction thereof is horizontal, the rod portion 1 is inclined by 45 degrees with respect to the horizontal plane. Can be received.

  The rod antenna detachable with the plug 21 at the base end 2 is attached to a jack 31 that receives the antenna-side multipolar plug 21 at both ends of the soft coaxial line 30 and a jack (described later) on the portable device side. The antenna cable 3 configured by providing each of the possible multipolar plugs 32 can extend the space between the antenna and the mobile device body and install the antenna in a free place.

  FIG. 4 shows an external configuration of the antenna cable 3. The antenna cable 3 is composed of a coaxial cable 30 having an overall length L2 = 850 mm, and a three-pole jack 31 for receiving a φ3.5 mm two-pole plug 21 on the rod antenna side is disposed on the distal end side, and the proximal end side. Is provided with a two-pole φ3.5 mm two-pole plug 32 for connection to the tuner side (portable device). The antenna signal received from the rod antenna is transmitted through the core wire of the coaxial cable, connected to the tip of the two-pole plug, and only the core wire is molded by integral molding.

  FIG. 5 shows a state in which the installation location of the rod antenna is extended from the jack of the device main body using the antenna cable 3. When attaching a rod antenna to a notebook PC with a folded (clamshell) structure, as shown in the figure, use the antenna cable 3 to install the antenna at any location, such as the front edge of the liquid crystal panel, to increase reception sensitivity. Can do. Also in this case, the rod antenna can be rotated 360 degrees with the longitudinal direction of the plug 21 as the rotation axis, and the directivity can be easily adjusted.

  FIG. 6 shows a plug circuit configuration of the rod antenna. FIG. 7 shows the internal configuration of the antenna cable 3 and the jack circuit configuration.

  As shown in FIG. 6, the plug 21 on the rod antenna side has a two-pole configuration of pins # 1 and # 3. The pin # 1 on the root side is not connected (NC) and is connected to the pin # 1 on the tip side. The antenna signal line 11 is connected.

  On the other hand, the jack 31 of the antenna cable 3 has a three-pole configuration of pins # 1 to # 3 as shown in FIG. 7, and the pins # 1 and # 2 are not connected (NC) and the pin # 3 The receiving RF signal from the rod antenna side is received.

  The antenna cable 3 main body can be manufactured using, for example, a coaxial cable widely used for audio, and includes a core wire 33, an inner insulator 34, a coaxial wire outer ground conductor 35, and a coaxial wire outer insulator. 36. The core wire 33 is assigned to each pin # 3 on the jack 31 side and the base plug 32 side, and serves as a transmission path for the received RF signal. The coaxial line outer ground conductor 35 is not connected on the jack 31 side, and is assigned to pin # 1 on the plug 32 side.

  FIG. 8 shows a circuit configuration around a three-pole jack on the tuner side (that is, portable device) that receives the rod antenna or antenna cable 3. As shown in the figure, the antenna jack 4 disconnects the pins # 1 to # 2 (NC) and receives a reception RF signal from the rod antenna side at the pin # 3, and a tuner circuit (not shown) at the subsequent stage. Transmit to.

  As the antenna jack 4, for example, a 3.5-pole tripolar jack 03-836F1 made by Excel Electronics can be used. 03-836F1 is a small jack manufactured for portable audio and can be mounted by reflow or manual soldering. FIG. 9 shows a view from the top surface of the small jack. When mounting on a printed wiring board, the lower part of the antenna jack is preferably grounded as much as possible. FIG. 10 shows an example of a recommended land pattern configuration for this small jack.

  When using the rod antenna according to the present embodiment, if a matching circuit is required, the antenna band resonates in the frequency band of 470 MHz to 890 MHz, and the antenna cable operates at the same resonance frequency.

  FIG. 11 shows measured values of the input characteristics in the usage mode of the rod antenna shown in FIG. 3, and Table 1 shows measured values of gain, and FIG. 12 shows average gains thereof. By measuring the ratio between the maximum and minimum values of the voltage of the transmission line, that is, the VSWR (Voltage Standing Wave Ratio) characteristic as input characteristics, the reflection coefficient Γ of the line can be indirectly known. . As can be seen from FIG. 11, in the desired UHF band (470 MHz to 890 MHz), VSWR is low, that is, loss due to reflection is kept low, and signal transmission is performed efficiently (generally, the VSWR of the antenna is 1. 5 or less is ideal).

  Further, FIG. 13 shows measured values of VSWR characteristics in a rod antenna usage form when an antenna and a cable as shown in FIG. 5 are used together, and Table 2 shows measured values of gains and shows average gains. 14 respectively. In this mode of use, it was confirmed that a sufficient antenna gain was obtained as a portable device, although the VSWR was lowered by the cable routing.

  The directivity of the rod antenna is said to be equal to the directivity of the dipole antenna. The directivity of each frequency in the UHF band of the rod antenna in the usage mode shown in FIG. 3 is shown in FIGS. 15A to 15P. Further, the orientation of the rod antenna at this time is as shown in FIG. 15Q. Moreover, the directivity for each frequency in the UHF band of the rod antenna in the usage mode shown in FIG. 5 is shown in FIGS. 16A to 16P, respectively. Further, the orientation of the rod antenna at this time is as shown in FIG. 16Q. In any use form, it was confirmed that good reception sensitivity was obtained over 360 degrees in almost all frequency channels.

  In the embodiment shown in FIG. 6, the antenna signal line of the rod antenna is assigned to the tip pin of the multipolar plug at the base end 2, but as a modified example, pins other than the tip pin of the multipolar plug It is also conceivable to assign antenna signal lines to.

  17 and 18 show Smith charts for respective plug assignments. From FIG. 17, the impedance at the design frequency (470 to 890 [MHz]) can be increased by feeding the tip pin. On the other hand, it can be seen that when power is supplied by means other than the tip pin, the impedance at the design frequency becomes low.

  The present invention has been described in detail above with reference to specific embodiments. However, it is obvious that those skilled in the art can make modifications and substitutions of the embodiment without departing from the gist of the present invention. That is, the present invention has been disclosed in the form of exemplification, and the contents described in the present specification should not be interpreted in a limited manner. In order to determine the gist of the present invention, the claims should be taken into consideration.

FIG. 1 is a diagram showing an external configuration of an antenna device according to an embodiment of the present invention. FIG. 2 is a diagram showing an internal configuration of the rod portion 1 of the rod antenna. FIG. 3 is a diagram showing an example of how the rod antenna is used. FIG. 4 is a diagram showing an external configuration of the antenna cable 3. FIG. 5 is a diagram showing a state in which the installation location of the rod antenna is extended from the jack of the device body using the antenna cable 3. FIG. 6 is a diagram showing a plug circuit configuration of the rod antenna. FIG. 7 is a diagram showing the internal configuration of the antenna cable 3 and the jack circuit configuration. FIG. 8 is a diagram showing a circuit configuration around a three-pole jack on the tuner side (that is, portable device) that receives the rod antenna or antenna cable 3. FIG. 9 is a view showing a view from the upper surface of the small jack. FIG. 10 is a diagram showing a configuration example of a recommended land pattern related to the small jack shown in FIG. FIG. 11 is a diagram showing measured values of input characteristics in the usage mode of the rod antenna shown in FIG. FIG. 12 is a diagram showing an average gain in the usage form of the rod antenna shown in FIG. FIG. 13 is a diagram showing measured values of input characteristics in a usage mode of a rod antenna using both an antenna and a cable. FIG. 14 is a diagram showing an average gain in a usage mode of a rod antenna using an antenna and a cable together. FIG. 15A is a diagram showing the directivity in the vertical direction in the UHF band (470 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 15B is a diagram showing horizontal directivity in the UHF band (470 MHz band) in the usage mode of the rod antenna shown in FIG. 3. FIG. 15C is a diagram illustrating the directivity in the vertical direction within the UHF band (520 MHz band) in the usage mode of the rod antenna illustrated in FIG. 3. FIG. 15D is a diagram illustrating the directivity in the horizontal direction within the UHF band (520 MHz band) in the usage mode of the rod antenna illustrated in FIG. 3. FIG. 15E is a diagram showing the directivity in the vertical direction in the UHF band (570 MHz band) in the usage mode of the rod antenna shown in FIG. 3. FIG. 15F is a diagram showing the directivity in the horizontal direction within the UHF band (570 MHz band) in the usage mode of the rod antenna shown in FIG. 3. FIG. 15G is a diagram illustrating the directivity in the vertical direction within the UHF band (620 MHz band) in the usage mode of the rod antenna illustrated in FIG. 3. FIG. 15H is a diagram illustrating the directivity in the horizontal direction within the UHF band (620 MHz band) in the usage mode of the rod antenna illustrated in FIG. 3. FIG. 15I is a diagram showing the directivity in the vertical direction in the UHF band (670 MHz band) in the usage mode of the rod antenna shown in FIG. 3. It is the figure which showed the directivity of the horizontal direction in a UHF band (670 MHz band) in the utilization form of the rod antenna shown to FIG. 15BJ and FIG. FIG. 15K is a diagram illustrating the directivity in the vertical direction within the UHF band (720 MHz band) in the usage mode of the rod antenna illustrated in FIG. 3. FIG. 15L is a diagram illustrating the directivity in the horizontal direction within the UHF band (720 MHz band) in the usage mode of the rod antenna illustrated in FIG. 3. FIG. 15M is a diagram illustrating the directivity in the vertical direction within the UHF band (770 MHz band) in the usage mode of the rod antenna illustrated in FIG. 3. FIG. 15N is a diagram showing the directivity in the horizontal direction in the UHF band (770 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 15O is a diagram showing the directivity in the vertical direction within the UHF band (906 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 15P is a diagram showing the directivity in the horizontal direction in the UHF band (906 MHz band) in the usage mode of the rod antenna shown in FIG. 3. FIG. 15Q is a diagram illustrating an orientation in the usage form of the rod antenna illustrated in FIG. 3. FIG. 16A is a diagram showing the directivity in the vertical direction in the UHF band (470 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 16B is a diagram showing horizontal directivity in the UHF band (470 MHz band) in the usage mode of the rod antenna shown in FIG. 5. FIG. 16C is a diagram showing the directivity in the vertical direction within the UHF band (520 MHz band) in the usage mode of the rod antenna shown in FIG. 5. FIG. 16D is a diagram showing horizontal directivity in the UHF band (520 MHz band) in the usage mode of the rod antenna shown in FIG. 5. FIG. 16E is a diagram showing the directivity in the vertical direction in the UHF band (570 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 16F is a diagram illustrating the directivity in the horizontal direction within the UHF band (570 MHz band) in the usage mode of the rod antenna illustrated in FIG. 5. FIG. 16G is a diagram showing the directivity in the vertical direction in the UHF band (620 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 16H is a diagram illustrating the directivity in the horizontal direction within the UHF band (620 MHz band) in the usage mode of the rod antenna illustrated in FIG. 5. FIG. 16I is a diagram illustrating the directivity in the vertical direction within the UHF band (670 MHz band) in the usage mode of the rod antenna illustrated in FIG. 5. It is the figure which showed the directivity of the horizontal direction in a UHF band (670 MHz band) in the utilization form of the rod antenna shown to FIG. 16BJ and FIG. FIG. 16K is a diagram illustrating the directivity in the vertical direction within the UHF band (720 MHz band) in the usage mode of the rod antenna illustrated in FIG. 5. FIG. 16L is a diagram showing the directivity in the horizontal direction within the UHF band (720 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 16M is a diagram showing the directivity in the vertical direction within the UHF band (770 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 16N is a diagram illustrating the directivity in the horizontal direction within the UHF band (770 MHz band) in the usage mode of the rod antenna illustrated in FIG. 5. FIG. 16O is a diagram showing the directivity in the vertical direction within the UHF band (906 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 16P is a diagram showing the directivity in the horizontal direction in the UHF band (906 MHz band) in the usage mode of the rod antenna shown in FIG. FIG. 16Q is a diagram showing the orientation in the usage form of the rod antenna shown in FIG. FIG. 17 is a diagram showing a Smith chart of the rod antenna when an antenna signal is assigned to the tip pin of the multipolar plug. FIG. 18 is a view showing a Smith chart of a rod antenna when an antenna signal is assigned to a pin other than the tip pin of the multipolar plug.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rod part 11 ... Conductor part 12 ... Insulator 13 ... Electric wire 14 ... Molding material 2 ... Base end part 21 ... Multipolar plug 3 ... Antenna cable 31 ... Jack 32 ... Multipolar plug 33 ... Core wire 34 ... Inner insulator 35 ... Coaxial sheath ground conductor 36 ... Coaxial wire sheath insulator

Claims (5)

A rod-shaped antenna device,
An electric wire in which a conductor portion made of one or more bare soft copper wires and acting as an antenna signal wire is covered with a first insulator; and a rod portion made of a molding material made of a second insulator further covering the electric wire; ,
Bends approximately 135 degrees with respect to the rod part, and includes a base end part provided with a multipolar plug,
The antenna signal line is connected to a tip pin of the multipolar plug, and is detachably attached to a tuner device including a jack via the plug, and rotates when the longitudinal direction of the multipolar plug is a rotation axis when attached. Is possible,
An antenna device characterized by that. The electric wire is composed of a soft coaxial line, and the core wire is used as an antenna signal line.
The antenna device according to claim 1. An antenna cable comprising a soft coaxial line, a jack for receiving a base end plug of the antenna device at both ends thereof, and a multipolar plug that can be attached to the jack on the tuner device side; Extending between the device and the tuner device body with the antenna cable,
The antenna device according to claim 1. A jack that receives the plug of the antenna device according to claim 1, and receives an antenna signal.
A tuner device characterized by that. A jack for receiving the plug of the antenna cable according to claim 2, and receiving an antenna signal from an antenna device attached to the jack of the antenna cable.
A tuner device characterized by that.