JP2011199651A - High frequency receiving and transmission cable and receiver - Google Patents

Abstract

A high-frequency receiving transmission cable and a receiving apparatus that can reduce transmission loss and can sufficiently maintain the mechanical strength of a relay unit while suppressing an increase in size.
A receiving system includes a high-frequency transmission unit for receiving or transmitting a high-frequency signal, a coaxial transmission cable for transmitting the received signal, a high-frequency transmission unit, and a coaxial transmission cable. A high-frequency transmission unit 32 and a coaxial transmission cable 31 formed by a coaxial cable with a shield portion covered with a jacket to form a high-frequency transmission unit 32. The jacket of the relay part 33 of 37 is separated at the intermediate part, and the separation part 370 has a resin molded part 371 formed by resin molding.
[Selection] Figure 3

Description

  The present invention relates to a high-frequency receiving transmission cable and a receiving apparatus having a structure for holding an antenna coaxial cable applicable to portable electronic devices such as portable AV devices and cellular phones.

  Currently, for example, in portable terminals such as portable audio devices and communication terminals, an earphone having a remote control function for providing a relay unit and controlling the terminal from there in order to improve user convenience when viewing with the earphone Cables are widely used.

In portable terminals, input / output parts are being shared as the terminals become smaller.
The earphone cable has a structure having many signal lines such as a microphone signal, a reception button, a remote control function, and an antenna function as well as the original audio.
As a result, transmission signals are becoming higher in frequency and cable diameters are increasing with the increase in the number of cables.

In recent years, an electronic device such as a communication terminal typified by a mobile phone has been increasingly equipped with a function of receiving FM radio, digital radio, or television broadcast waves.
The sound of the electronic device is also listened to with an earphone (including headphones) through an earphone cable using a coaxial cable.

Also, in electronic devices such as mobile phones equipped with a television receiver, the sound is listened to with earphones, and the earphone cable is formed of a shield cable to function as a receiving antenna, which is also used for high-frequency signal transmission To be done.
A so-called earphone antenna is disclosed in Patent Document 1, for example.

Japanese Patent No. 4123262

By the way, the earphone cable having a remote control function in the relay portion is tied with a cable and the knot is sandwiched between cases in order to ensure mechanical strength.
However, in this structure, the concentric structure of the coaxial cable is deformed due to the bundling, and the knot is increased in proportion to the deterioration of the signal transmission characteristics at high frequencies and the thickness of the cable itself, resulting in an increase in the size of the relay unit. There is a disadvantage.

Further, in order to satisfy the mechanical strength, the terminal portion needs to have a sufficiently long cord length. However, if the length exceeds a certain length, problems such as short circuit and deterioration of antenna characteristics occur.
Therefore, length management is required, but the knot itself moves, so the dimensions of the terminal portion are not stable, adjustment takes time, and production efficiency is poor.

  The method of integrally molding the jacket has little influence on the high-frequency transmission characteristics, but there is a problem that the tensile strength is remarkably deteriorated depending on the surface state of the jacket and the compatibility between the materials.

As described above, in the antenna cable having the existing relay unit, the attenuation amount of the high-frequency signal becomes large.
As the cable becomes thicker, the relay section becomes larger.
Since the dimensions of the terminal portion are not stable, there is a disadvantage that production efficiency is poor.

  An object of the present invention is to provide a high-frequency receiving transmission cable and a receiving apparatus that can reduce transmission loss while suppressing increase in size and that can sufficiently maintain the mechanical strength of a relay unit.

  A high-frequency reception transmission cable according to a first aspect of the present invention includes a high-frequency transmission unit for receiving or transmitting a high-frequency signal, a coaxial transmission cable for transmitting the received signal, the high-frequency transmission unit, and the coaxial transmission. A high-frequency transmission portion and a coaxial transmission cable formed by a coaxial cable with a shield portion covered with a jacket to form the high-frequency transmission portion. The jacket in the relay portion of the coaxial cable is separated at the intermediate portion, and the separation portion has a resin molded portion formed by resin molding.

  A receiving apparatus according to a second aspect of the present invention includes a high-frequency receiving transmission cable and an electronic device to which the high-frequency receiving transmission cable can be connected and having a broadcast wave receiving function. A high-frequency transmission unit for receiving or transmitting a high-frequency signal, a coaxial transmission cable for transmitting the received signal, the high-frequency transmission unit and the coaxial transmission cable are connected, and a relay unit that relays the signal; The high-frequency transmission part and the coaxial transmission cable are formed by a coaxial cable with a shield part covered with a jacket, and a jacket in a relay part of the coaxial cable forming the high-frequency transmission part is separated at an intermediate part, The separation part has a resin molded part formed by resin molding.

  According to the present invention, transmission loss can be reduced while suppressing the increase in size, and the mechanical strength of the relay unit can be sufficiently maintained.

It is a figure which shows the receiving system (receiving apparatus) containing the portable terminal which is an example of the electronic device containing the high frequency receiving transmission cable which forms the antenna cable which concerns on embodiment of this invention. It is a figure which shows the structural example of the coaxial cable with a shield part. It is a figure which shows the specific structure of the relay part which concerns on this embodiment, and the connection example of a coaxial transmission cable and a coaxial cable. It is a figure for demonstrating the problem of the knot structure of a coaxial cable. It is a figure for demonstrating the problem of a normal middle pushing structure. It is a figure for demonstrating the problem of an integral molding structure. It is a figure for demonstrating the characteristic structure of the coaxial cable which forms the high frequency transmission part of this embodiment. It is a figure which shows more concretely the structural example of the characteristic of the coaxial cable which forms the high frequency transmission part which concerns on this embodiment. It is a figure which shows the antenna gain when not binding with and without cable binding. It is a figure for demonstrating the shape of a resin molding part. It is a figure which compares and shows the case where it has the resin molding part which concerns on this embodiment, and the case where a coaxial cable is bound. It is a figure which shows the 2nd structural example of the coaxial cable which forms the high frequency transmission part which concerns on this embodiment. It is a figure which shows the 3rd structural example of the coaxial cable which forms the high frequency transmission part which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The description will be given in the following order.
1. 1. Configuration example of receiving system (receiving device) 2. Configuration example of antenna cable 3. Configuration example of relay unit Characteristic configuration of coaxial cable forming high-frequency transmission section

<1. Configuration Example of Receiving System (Receiving Device)>
FIG. 1 is a diagram illustrating a receiving system (receiving device) including a mobile terminal that is an example of an electronic device (set device) including a high-frequency receiving transmission cable that forms an antenna cable according to an embodiment of the present invention.

  The reception system 10 includes a mobile terminal 20, a high frequency reception transmission cable 30, and an earphone cable 40 as main components.

The portable terminal 20 includes a television receiver, for example, and includes a display unit 21 such as an audio system circuit, a display system circuit, and a liquid crystal display device, and an operation unit 22 that performs key input and the like.
The portable terminal 20 includes an RF plug 23 to which a high-frequency receiving transmission cable 30 that forms an antenna cable for receiving a high-frequency signal is connected, an audio plug, and a round jack portion 24.

  The high-frequency receiving and transmitting cable 30 of the present embodiment can receive and transmit radio signals in the VHF band to UHF band used for receiving, for example, FM bands transmitted from broadcast stations and digital television broadcasts. It is.

The high-frequency reception transmission cable 30 includes a coaxial transmission cable 31, a high-frequency transmission unit 32, a relay unit 33, an audio plug 34, a connection unit 35 with the earphone cable 40, and a high-frequency blocking unit 36 using an inductor or a ferrite core.
In addition, the connection part 35 can be comprised including a high frequency interruption | blocking part.

  In this embodiment, the coaxial transmission cable 31 and the high-frequency transmission part 32 are formed by a coaxial cable with a shield part covered with, for example, a jacket.

The coaxial transmission cable 31 functions as an antenna cable, and a relay portion 33 is disposed at an intermediate portion so as to form a first transmission cable portion 31a and a second transmission cable portion 31b.
The one end side of the 1st transmission cable part 31a and the one end side of the 2nd transmission cable part 31b are formed so that it may exist in the board-like relay part 33, for example.
A connection part 35 including a high-frequency cutoff part is formed at a position on the other end side of the distance L from the relay part 33 of the first transmission cable part 31a.
A high frequency cutoff unit 32 is formed at a distance L from the relay unit 33 of the second transmission cable unit 31b.
The other end of the second transmission cable portion 31b from the formation position of the high-frequency cutoff portion 36 is formed as a third transmission cable portion 31c, and an audio plug 34 is connected to the end of the third transmission cable 31c. Yes.

In the present embodiment, as will be described in detail later, the high-frequency transmission unit 32 includes a coaxial cable 37 for high-frequency signal transmission having a coaxial structure in the relay unit 33.
The coaxial cable 37 has one end connected to the relay unit 33 and the other end connected to the RF plug 23.
Thus, the coaxial cable 37 and the coaxial cable 37 forming the high-frequency transmission unit 32 are connected at the relay unit 33 to form a so-called dipole antenna.

As will be described in detail later, the coaxial cable 37 forming the high-frequency transmission unit 32 is formed by a high-frequency signal transmission cable having a coaxial structure and a resin molding unit in the relay unit 33.
The coaxial cable 37 has a structure in which the jacket of the high-frequency signal transmission cable is separated at the intermediate portion, and the separation portion is resin-molded.
Further, the resin molding part may have a structure in which ferromagnetic powder is contained and the skin current of the coaxial outer conductor is cut off.
Also, the tensile strength can be improved by thickening the wire diameter of the outer conductor with solder or the like at the separation portion of the jacket and molding the resin.
Further, the resin molding portion can have a structure that fits with the casing of the relay portion 33.

<2. Example of antenna cable configuration>
[Configuration of coaxial cable with shield]

  FIG. 2 is a diagram illustrating a structure example of a coaxial cable with a shield portion.

2 is formed by a three-core coaxial cable 310, and insulates a plurality of core wires 311, 312, 313, and core wires 311, 312, 313 that form an audio L line and an R line. An internal insulator 314 is included.
The coaxial cable 310 has a shield part 315 as an outer conductor disposed on the outer periphery of the insulator 314 and an outer insulator (outer skin, jacket) 316 such as an elastomer covering the entire outer periphery.
The core wires 311, 312, 313 are formed of, for example, an aramid fiber-containing polyurethane wire.
The insulator 314 is formed by, for example, X-ray irradiation crosslinked PE.
Moreover, the shield part 315 is formed, for example with an annealed copper wire.
Shield portion 315 is formed of a braided shield obtained by braiding a plurality of conductive wires, for example, bare annealed copper wire.
The braided shield is known as an electrostatic shield method that has less flexibility in bending even when bent, and has adequate flexibility, bending strength, and mechanical strength, compared to a horizontal shield. is there.
The core wires 311, 312, 313 and the shield part 315 have impedance at high frequencies.

The coaxial transmission cable 31 has the structure shown in FIG.
The coaxial cable 37 forming the high-frequency transmission unit has the same configuration as the structure of FIG. However, the number of core wires may be one.

<3. Example of relay unit configuration>
Next, a configuration example of the relay unit 33 will be described.
FIG. 3 is a diagram illustrating a specific configuration of the relay unit according to the present embodiment, and a connection example of the coaxial transmission cable and the coaxial cable.

The relay portion 33 is formed by, for example, a substrate or molding.
In the relay portion 33, the coaxial transmission cable 31 is separated into a first transmission cable 31a on the connection portion 35 side with the earphone cable 40 and a second transmission cable 31b on the audio plug side, and the core wires 311, 312, 313 is exposed.
That is, in the relay portion 33, the coaxial transmission cable 31 is separated by removing the shield portion 315 and the jacket 316 of the insulator 314.
Further, the shields 315a and 315b are exposed in the vicinity of the separation part SPRT by removing the jackets 316a and 316b.

In the separation part SPRT, the core wire 311a of the first transmission cable 31a on the connection part 35 side and the core wire 311b of the second transmission cable 31b on the audio plug side are connected via an inductor L1 for high-frequency cutoff.
The core wire 312a of the first transmission cable 31a on the connection portion 35 side and the core wire 312b of the second transmission cable 31b on the audio plug side are connected via an inductor L2 for high frequency cutoff.
The core wire 313a of the first transmission cable 31a on the connection portion 35 side and the core wire 313b of the second transmission cable 31b on the audio plug side are connected via an inductor L3 for high frequency cutoff.

A balance-unbalance converter (balun) 330 is disposed in the vicinity of the separation unit SPRT.
And the one end side of the coaxial cable 37 which forms the high frequency transmission part 32 on both sides of the balun 330 is arrange | positioned so that it may be substantially orthogonal to the coaxial transmission cable 31. FIG.
The coaxial cable 37 has a core wire 311 c exposed at one end near the balun 330.
Further, the shield portion 315c is exposed by removing the jacket 316c in the vicinity of the exposed portion of the core wire 311c.
The core wire 311 c of the coaxial cable 37 is connected to the shield part 315 a of the first transmission cable 31 a on the connection part 35 side through one terminal 331 of the balun 330.
The shield part 315 c of the coaxial cable 37 is connected to the shield part 315 b of the second transmission cable 31 b on the audio plug side via the other terminal 332 of the balun 330.
By arranging the balun 330 in the relay unit 33, it is possible to block noise that circulates from the electronic device (set) 20 while transmitting a high-frequency signal.

In the second coaxial cable 32, the core wire 311c is exposed at the other end.
Further, the shield portion 315c is exposed by removing the jacket 316c in the vicinity of the exposed portion of the core wire 311c.
The other end side core wire 311 c is connected to the tuner 25 in a state where it is connected to the RF plug 23 of the mobile terminal 20.
The other end side shield part 315c is connected to the set ground GND while being connected to the RF plug 23 of the mobile terminal 20.

  The relay part 33 having the above configuration forms a dipole antenna.

<4. Characteristic configuration of coaxial cable forming high-frequency transmission section>
As a feature of the present embodiment, the jacket 316c of the second coaxial cable 32 is separated at an intermediate portion between one end side and the other end side, and a resin molding portion 371 is formed in the separation portion 370.
The resin molding part 371 has a function of preventing the removal for improving the tensile strength while transmitting a high-frequency signal.

  As described above, in the coaxial cable 37, the reason why the jacket 316c is separated at the intermediate portion between the one end side and the other end side and the resin molding portion 371 is formed in the separation portion 370 will be described with reference to FIGS. .

As shown in FIG. 4, in the case where the cables are tied and the knot portion 50 is sandwiched between the casings, the concentric circular structure of the coaxial cable 310 is deformed and the signal transmission characteristics at high frequencies are deteriorated due to the binding. Further, the knot is increased in proportion to the thickness of the cable itself, and as a result, the relay portion is enlarged.
Further, in order to satisfy the mechanical strength, the terminal portion needs to have a sufficiently long cord length. However, if the length exceeds a certain length, problems such as short circuit and deterioration of antenna characteristics occur.
Therefore, length management is required, but the knot itself moves, so the dimensions of the terminal portion are not stable, adjustment is required, and production efficiency is reduced.

  As shown in FIG. 5, when the intermediate pressing structure is simply used, it is necessary to press firmly because it is pressed by a mold at the mouth of the intermediate pressing portion 51. Moreover, the shield part by braiding needs the hook part 52 in order to improve the tensile strength.

  As shown in FIG. 6, the method of integrally molding the jacket 316 has little influence on the high-frequency transmission characteristics, but depending on the surface state of the jacket and the compatibility between the materials, the so-called bite is poor and the tensile strength is remarkably high. The problem which deteriorates is mentioned.

Therefore, in the present embodiment, as shown in FIG. 7, in the coaxial cable 37, the jacket 316 c is separated at the intermediate portion between the one end side and the other end side, and a resin molding portion 371 as an intermediate pressing portion is provided on the separation portion 370. Forming.
In this case, the jacket 316 is stripped and slid to form.

  FIG. 8 is a diagram more specifically showing a characteristic configuration example of the coaxial cable forming the high-frequency transmission unit according to the present embodiment.

In the present embodiment, in the relay part 33, a resin molding part 371 is provided for holding the coaxial cable 37.
The portion of the resin molded part mold that holds the coaxial cable 37 is provided with a jacket 316 of the coaxial cable 37, and the jacket 316 of the coaxial cable 37 is removed at an intermediate portion of the holding portion.
And as shown in FIG. 8, it is in the state into which the molding resin has flowed into the shield part 315 which is an outer conductor.
When the resin flows into the shield part 315, a large contact area between the resin and the cable can be obtained. For this reason, it is possible to fix both the signal line and the covering against the load that pulls the coaxial cable 37.
That is, since the resin is injected at the time of molding, the so-called biting area (contact area) of the resin increases and the tensile strength increases.

  FIGS. 9A and 9B are diagrams showing antenna gains when the cables are bundled and not bundled.

  It can be seen that by concentrating the coaxial cables, the concentric circular shape is deformed, and the characteristics fluctuate due to capacitive coupling between the signal lines.

  FIGS. 10A and 10B are diagrams for explaining the shape of the resin molded portion.

As shown in FIG. 10, the shape of the resin molding portion 371 of the present embodiment is preferably a shape having a convex portion such as a rectangular parallelepiped or a concave portion.
This is because the protrusion shape of the resin molding portion 371 is matched with the casing component 333, and the stress to which the cable is twisted is received by the molding portion and the casing 333, and the stress is not transmitted to the soldered portion of the substrate.
By adopting a structure in which the resin molded portion 371 is fitted into the housing 333, the gap between the resin molded portion 371 and the housing 333 can be reduced. The load of becomes smaller.

FIGS. 11A and 11B are diagrams showing a comparison between the case where the resin molded portion according to this embodiment is provided and the case where the coaxial cable is bound.
FIG. 11A shows the structure of this embodiment, and FIG. 11B shows the bundling structure.

  By using resin molding, the fixing location becomes clear, and since it does not loosen after fixing like a knot, it is easy to make a jig for terminal processing, etc., and it is easy to dimension the terminal portion. Terminal processing can be performed immediately after.

  FIG. 12 is a diagram illustrating a second configuration example of the coaxial cable that forms the high-frequency transmission unit according to the present embodiment.

In this example, magnetic powder 372 is mixed in a resin material.
Thereby, the skin current flowing in the shield part 315 which is the outer conductor of the coaxial cable 37 can be attenuated.
With this effect, it is possible to exclude the influence of the cable on the antenna characteristics, and it is possible to expect an effect of blocking noise transmitted from the set.

  FIG. 13 is a diagram illustrating a third configuration example of the coaxial cable forming the high-frequency transmission unit according to the present embodiment.

This example is an example in which a knob portion 373 is formed by solder or the like on the shield portion 315 that is the outer conductor of the coaxial cable in the resin molding portion 371.
This makes it possible to enlarge the hooked portion, and an improvement in tensile strength is expected.

As described above, according to the present embodiment, the reception system 10 includes the high-frequency transmission unit 32 for receiving or transmitting a high-frequency signal and the coaxial transmission cable 31 for transmitting the received signal. .
The reception system 10 includes a relay unit 33 to which a high-frequency transmission unit 32 and a coaxial transmission cable 31 are connected and relay a signal.
The high-frequency transmission part 32 and the coaxial transmission cable 31 are formed of a coaxial cable with a shield part covered with a jacket.
And the jacket in the relay part 33 of the coaxial cable 37 which forms the high frequency transmission part 32 is isolate | separated in an intermediate part, The separation part 370 has the resin molding part 371 resin-molded.
Therefore, according to the present embodiment, the following effects can be obtained.

According to the present embodiment, there is an advantage that transmission loss can be reduced while suppressing increase in size, and the mechanical strength of the relay unit can be sufficiently maintained.
As a result, the performance of the earphone cable can be improved, and the earphone cable can be reduced in size and productivity.
In addition, the high frequency transmission part 32 can also be formed as a high frequency signal distribution point.
Further, the coaxial transmission cable 31 functions as an antenna cable, and the high-frequency transmission unit 32 can be formed as a connection point with the antenna cable.

  DESCRIPTION OF SYMBOLS 10 ... Reception system (reception apparatus), 20 ... Portable terminal, 23 ... RF plug, 30 ... High frequency reception transmission cable, 31 ... Coaxial transmission cable, 32 ... High frequency transmission part, 33 ... Relay unit, 37 ... Coaxial cable forming a high-frequency transmission unit, 40 ... Earphone cable.

Claims (16)

A high-frequency transmission unit for receiving or transmitting a high-frequency signal;
A coaxial transmission cable for transmitting the received signal;
The high-frequency transmission unit and the coaxial transmission cable are connected, and have a relay unit that relays signals,
The high-frequency transmission unit and the coaxial transmission cable are
Formed by a coaxial cable with a shield part covered by a jacket,
A high-frequency receiving transmission cable having a resin molded part in which a jacket in a relay part of a coaxial cable forming the high-frequency transmission part is separated at an intermediate part, and the separation part is resin-molded. In the resin molding part,
The high-frequency receiving transmission cable according to claim 1, comprising ferromagnetic powder. The high frequency receiving and transmitting cable according to claim 1 or 2, wherein a ridge portion in which a wire diameter of the shield portion is increased is formed in the separation portion of the jacket. The high frequency receiving and transmitting cable according to any one of claims 1 to 3, wherein the resin molded portion has a structure that fits with a casing of a relay portion. The coaxial transmission cable and the coaxial cable of the high-frequency transmission unit are
A core cable and a shield part are formed by a coaxial cable formed concentrically,
The coaxial transmission cable is
A high frequency cutoff part is inserted into the core wire in the relay part,
The coaxial cable forming the high frequency transmission part is
On one end side, the core wire is connected to the shield part on one side of the high-frequency cutoff part of the coaxial transmission cable,
The high frequency receiving transmission cable according to any one of claims 1 to 4, wherein a shield portion is connected to the shield portion on the other side of the high frequency cutoff portion of the coaxial transmission cable. The relay section
Including a balun
The core wire of the coaxial cable forming the high-frequency transmission part and the shield part on one side of the high-frequency cutoff part of the coaxial transmission cable are connected via one terminal of the balance-unbalance converter,
6. The shield part of the coaxial cable forming the high-frequency transmission part and the shield part on the other side of the high-frequency cutoff part of the coaxial transmission cable are connected via the other terminal of the balanced / unbalanced converter. The described high-frequency receiving transmission cable. The high-frequency reception transmission cable according to any one of claims 1 to 6, wherein the high-frequency transmission unit is a high-frequency signal distribution point. The coaxial transmission cable functions as an antenna cable,
The high-frequency reception transmission cable according to any one of claims 1 to 7, wherein the high-frequency transmission unit is a connection point with the antenna cable. A high-frequency receiving transmission cable;
The high frequency receiving transmission cable is connectable, and has an electronic device having a broadcast wave receiving function,
The high frequency receiving transmission cable is
A high-frequency transmission unit for receiving or transmitting a high-frequency signal;
A coaxial transmission cable for transmitting the received signal;
The high-frequency transmission unit and the coaxial transmission cable are connected, and have a relay unit that relays signals,
The high-frequency transmission unit and the coaxial transmission cable are
Formed by a coaxial cable with a shield part covered by a jacket,
A receiver having a resin molding part in which a jacket in a relay part of a coaxial cable forming the high-frequency transmission part is separated at an intermediate part, and the separation part is resin-molded. In the resin molding part,
The receiving device according to claim 9, comprising ferromagnetic powder. 11. The receiving device according to claim 9, wherein a grooving portion in which a wire diameter of the shield portion is increased is formed in the separation portion of the jacket. The receiving device according to claim 9, wherein the resin molding unit has a structure that fits with a casing of the relay unit. The coaxial transmission cable and the coaxial cable of the high-frequency transmission unit are
A core cable and a shield part are formed by a coaxial cable formed concentrically,
The coaxial transmission cable is
A high frequency cutoff part is inserted into the core wire in the relay part,
The coaxial cable forming the high frequency transmission part is
On one end side, the core wire is connected to the shield part on one side of the high-frequency cutoff part of the coaxial transmission cable,
A shield part is connected to the shield part on the other side of the high-frequency cutoff part of the coaxial transmission cable;
The core wire on one side of the high-frequency cutoff portion of the antenna unit cable is connected to the earphone, and the core wire on the other side is connected to the audio terminal of the electronic device,
The other end of the coaxial cable is
The receiving device according to claim 9, wherein the receiving device is connectable to a tuner of the electronic device. The relay section
Including a balun
The core wire of the coaxial cable forming the high-frequency transmission part and the shield part on one side of the high-frequency cutoff part of the coaxial transmission cable are connected via one terminal of the balance-unbalance converter,
The shield part of the coaxial cable forming the high-frequency transmission part and the shield part on the other side of the high-frequency cutoff part of the coaxial transmission cable are connected via the other terminal of the balanced / unbalanced converter. The receiving device described. The receiving device according to claim 9, wherein the high-frequency transmission unit is a high-frequency signal distribution point. The coaxial transmission cable functions as an antenna cable,
The receiving apparatus according to claim 9, wherein the high-frequency transmission unit is a connection point with the antenna cable.

Images