Cable with antenna

Abstract

To provide a cable with an antenna that can easily widen the adjustment range of antenna directivity and easily change the range of radio wave coverage.SOLUTION: A cable with an antenna includes: a signal transmission cable 20 formed in a flexible long shape; an input terminal 30 that is provided at a first end 21, which is an end of the signal transmission cable 20, and that has a transmission signal input from a signal source 11; a terminator 40 arranged at a second end 22 of the signal transmission cable 20; a plurality of branching filters 50 arranged at intervals between the input terminal 30 and the terminator 40 and performing at least one of branching the transmission signal at a predetermined signal strength ratio and branching some of a plurality of signals mixed into the transmission signal; a plurality of antennas 70 that radiate radio waves based on the transmission signals branched from the branching filters 50; and a DC power supply connection terminal 60 that is arranged between the branching filters 50 and the antenna 70, and that superimposes a DC voltage or a DC current supplied from a DC power supply 65 on the transmission signal and outputs it to the antenna.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a cable with an antenna. [Background technology]

[0002] The gain and directional performance of conventional directional antennas are determined by the antenna structure. The range of radio waves that can be transmitted is also determined by the power supply settings and the antenna's installation position and orientation. Unless changes are made to the power supply settings or installation position, the antenna's directivity and the range of radio waves emitted from the antenna do not change (see, for example, Patent Document 1).

[0003] The following methods are known for changing the antenna directivity. First, a known method is to change the antenna directivity by attaching a directional antenna to a rotating body and changing the direction of the directional antenna around the rotating body, and second, a known method is to change the antenna directivity by changing the input port of a patch antenna. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-318649 Summary of the Invention [Problem to be solved by the invention]

[0005] The above-described method of changing the range of radio waves by changing the antenna directivity has the following problems. When a directional antenna is attached to a rotating body, the antenna cannot be oriented in the direction of the rotation axis of the rotating body. In other words, there are directions in three-dimensional space where radio waves cannot be emitted from the antenna.

[0006] When switching the input port of a patch antenna, there was a problem in that the patch antenna is a planar antenna and therefore the antenna beam cannot be directed in the port direction.

[0007] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a cable with an antenna that makes it easy to widen the adjustment range of the antenna directivity and change the range over which radio waves can reach. [Means for solving the problem]

[0008] The cable with antenna of the present disclosure comprises a signal transmission cable formed in a flexible, long shape; an input terminal provided at a first end, which is an end of the signal transmission cable, to which a transmission signal is input from a signal source; a terminator arranged at a second end, which is an end different from the first end, of the signal transmission cable; a plurality of branching filters arranged at intervals on the signal transmission cable between the input terminal and the terminator, and performing at least one of branching the transmission signal at a predetermined signal strength ratio and branching a portion of a plurality of signals mixed into the transmission signal; a plurality of antennas that radiate radio waves based on the transmission signal branched from the branching filters; and a DC power supply connection terminal arranged between at least one of the plurality of branching filters and the antenna to which the transmission signal branched from the branching filter is input, and that superimposes a DC voltage or DC current supplied from a DC power supply on the transmission signal and outputs it to the antenna.

[0009] According to the cable with antenna of the present disclosure, multiple antennas are arranged on a signal transmission cable. Because the signal transmission cable is flexible, it is easy to change the position and orientation of the antennas even after the multiple antennas have been installed.

[0010] By providing a DC power supply connection terminal, the transmission signal input to the antenna can be amplified. By amplifying the transmission signal, it becomes easier to widen the range of the radio waves emitted from the antenna. [Effects of the Invention]

[0011] According to the cable with antenna of the present disclosure, multiple antennas are arranged on the signal transmission cable and a DC power supply connection terminal is provided, which has the effect of making it easier to expand the adjustment range of the antenna directivity and to change the range over which radio waves can reach. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic diagram illustrating an embodiment of an antenna-equipped cable according to the present disclosure. [Figure 2] FIG. 2 is a perspective view showing the shape of the antenna-equipped cable of FIG. [Figure 3] 3 is an enlarged view illustrating the shape of the DC power supply connection terminal of FIG. 2. FIG. [Figure 4] 4 is a schematic diagram illustrating the internal configuration of the DC power supply connection terminal of FIG. 3. [Figure 5] 10 is a schematic diagram illustrating the configuration of a cable with an antenna in which two first signal transmission cables extend from one input terminal. FIG. [Figure 6] 10 is a schematic diagram illustrating the configuration of an antenna-equipped cable in which a branch is provided in a first signal transmission cable. FIG. [Figure 7] 10 is a schematic diagram illustrating the configuration of an antenna-equipped cable in which a branch is provided in a second signal transmission cable. FIG. [Figure 8] 10 is a schematic diagram illustrating the configuration of an antenna-equipped cable in which an application terminal is provided on a second signal transmission cable. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] A cable with antenna 10 according to an embodiment of the present disclosure will be described below with reference to Figures 1 to 8. The cable with antenna 10 of this embodiment is used for radiating electromagnetic waves (hereinafter also referred to as "radio waves") to a single linear region or to a linear region having one or more branches.

[0014] The antenna-equipped cable 10 of this embodiment is used, for example, in factories with production lines, warehouses that distribute goods, automated factories or warehouses, inside ships, homes, offices, etc.

[0015] High-frequency radio waves are emitted from the antenna-equipped cable 10 of this embodiment. The frequency of the radiated radio waves is preferably a frequency in the MHz band or higher, and more preferably a frequency included in the band of 915 MHz or higher and 5.8 GHz or lower. The radiated radio waves may have a single frequency or multiple different frequencies.

[0016] Fig. 1 is a schematic diagram showing one embodiment of a cable with an antenna according to the present disclosure, and Fig. 2 is a perspective view showing the shape of the cable with an antenna.

[0017] 1 and 2, the antenna-equipped cable 10 includes a signal transmission cable 20, an input terminal 30, a terminator 40, a plurality of branching filters 50, a plurality of DC power supply connection terminals 60, and a plurality of antennas 70. The antenna-equipped cable 10 also includes a DC power supply 65. In this embodiment, one branching filter 50 is connected in series with one DC power supply connection terminal 60 and one antenna 70 so that transmission signals can be transmitted.

[0018] It is also possible that one antenna 70 is connected to one duplexer 50, but no DC power supply connection terminal 60 is connected thereto. It is also possible that one DC power supply connection terminal 60 is connected to one duplexer 50, but no antenna 70 is connected thereto. It is also possible that both the DC power supply connection terminal 60 and the antenna 70 are not connected to one duplexer 50.

[0019] In this embodiment, four duplexers 50, four DC power supply connection terminals 60, and four antennas 70 are provided. The number of duplexers 50 may be more or less than four. The number of DC power supply connection terminals 60 may be more or less than four. The number of antennas 70 may be more or less than four.

[0020] The signal transmission cable 20 has a flexible, long shape. The signal transmission cable 20 is a cable that transmits a transmission signal, which is a high-frequency signal. The transmission signal is a signal that is generated and output by a signal source 11, which is a high-frequency power source (also referred to as an amplifier).

[0021] The signal transmission cable 20 of this embodiment includes a plurality of cables. Of the plurality of cables, the cable adjacent to the signal source 11 is referred to as a first signal transmission cable 20A. The other cables are referred to as second signal transmission cables 20B.

[0022] Terminals for connecting the first signal transmission cable 20A and the second signal transmission cable 20B so as to be able to transmit transmission signals are provided at the longitudinal ends of the first signal transmission cable 20A and the second signal transmission cable 20B. When there is no need to distinguish between the first signal transmission cable 20A and the second signal transmission cable 20B, they are also referred to as signal transmission cables 20.

[0023] The signal transmission cable 20 of this embodiment is a coaxial cable. Note that the signal transmission cable 20 may also be a communication cable used for communication, such as a LAN (Local Area Network) cable or a leaky coaxial cable.

[0024] The signal transmission cable 20 may be made up of a plurality of cables of the same length, or may be made up of a plurality of cables of different lengths.

[0025] The signal transmission cable 20 may have a configuration in which the characteristic impedance is uniform in the longitudinal direction, or the signal transmission cable 20 may have a configuration in which the characteristic impedance changes periodically in the longitudinal direction.

[0026] The signal transmission cable 20 may be made up of multiple cables of the same type or multiple cables of different types. The signal transmission cable 20 may be made up of multiple cables with the same distribution of characteristic impedance in the longitudinal direction or multiple cables with different distributions.

[0027] Signal source 11 is configured to generate a transmission signal that is radiated as a radio wave from antenna 70. Signal source 11 may be configured to generate only the transmission signal, or may be configured to superimpose a DC voltage or DC current on the generated transmission signal and output it.

[0028] The frequency of the transmission signal is preferably a frequency in the band of MHz or higher, and more preferably a frequency in the band of 915 MHz to 5.8 GHz. The transmission signal may be a signal with a single frequency, or may be a signal that is a mixture of multiple signals with different frequencies.

[0029] The input terminal 30 is an end of the first signal transmission cable 20A, and is a terminal provided at the first end 21 connected to the signal source 11. The input terminal 30 has a configuration into which a transmission signal output from the signal source 11 is input. The input terminal 30 has a known configuration that is detachable from the signal source 11.

[0030] The terminator 40 is an electronic component that is arranged at the second end 22, which is the end of the second signal transmission cable 20B that is farthest from the signal source 11, among the multiple second signal transmission cables 20B connected in series.

[0031] The terminator 40 is configured to be detachable from the second end 22. The terminator 40 of this embodiment has a terminating resistance of 50 Ω. The terminator 40 may be open (also referred to as "open") or short-circuited (also referred to as "short").

[0032] The multiple branching filters 50 are electronic components arranged at intervals between the input terminal 30 and the terminator 40 in the signal transmission cable 20. The branching filters 50 of this embodiment are arranged between the first signal transmission cable 20A and the second signal transmission cable 20B, or between two second signal transmission cables 20B. The maximum distance between two adjacent branching filters 50 is determined based on the length of the second signal transmission cable 20B arranged therebetween.

[0033] The splitter 50 has at least one of a configuration for splitting an input transmission signal at a predetermined signal strength ratio, and a configuration for splitting a portion of multiple signals mixed into the input transmission signal.

[0034] The duplexer 50 of this embodiment has a configuration provided with two terminals connected to the signal transmission cable 20 and one terminal connected to the DC power supply connection terminal 60 or the antenna 70. At least one of the branched transmission signal and the demultiplexed transmission signal is output to the terminal connected to the DC power supply connection terminal 60 or the antenna 70.

[0035] The branching filter 50 may have more than two terminals connected to the signal transmission cable 20. The branching filter 50 may have a plurality of terminals connected to the DC power supply connection terminal 60 or the antenna 70.

[0036] The predetermined signal strength ratio may be determined based on the strength required for radio waves radiated from the antenna 70 to which the transmission signal is input from the branching filter 50. The transmission signals to be branched may be determined based on the frequency of radio waves radiated from the antenna 70 to which the transmission signal is input.

[0037] Fig. 3 is an enlarged view illustrating the shape of the DC power supply connection terminal 60. Fig. 4 is a schematic view illustrating the internal configuration of the DC power supply connection terminal.

[0038] 3 and 4, the multiple DC power supply connection terminals 60 are electronic components arranged between the branching filter 50 and the antenna 70. The DC power supply connection terminals 60 are configured to receive the transmission signal branched or demultiplexed from the branching filter 50 and output the transmission signal to the antenna 70.

[0039] In this embodiment, the DC power supply connection terminals 60 are attached to all of the duplexers 50. However, the DC power supply connection terminals 60 may be attached to some of the duplexers 50 and not to the remaining duplexers 50.

[0040] The DC power supply connection terminal 60 is configured to superimpose a DC voltage or DC current on the transmission signal input from the branching filter 50 (also referred to as "amplifying the transmission signal") and output it to the antenna 70.

[0041] 4, the DC power supply connection terminal 60 of this embodiment is provided with a bias tee 61, a power supply connection terminal 62, and an amplifier 63. Note that the DC power supply connection terminal 60 may have another configuration that has a function of amplifying a transmission signal and outputting it to the antenna 70, in addition to the configuration provided with the bias tee 61, the power supply connection terminal 62, and the amplifier 63.

[0042] The bias tee 61 is an electronic component used to supply power to active elements such as ICs (integrated circuits) and transistors in high-frequency circuits. The bias tee 61 of this embodiment is an electronic component that superimposes a DC voltage or a DC current on the high-frequency signal passing through it. The bias tee 61 is configured so that no DC voltage or DC current is output to the branching filter 50 side, which is the input side of the high-frequency signal.

[0043] The power supply connection terminal 62 is a terminal that is detachably connected to a DC power supply 65. The power supply connection terminal 62 is configured to input a DC voltage or a DC current supplied from the DC power supply 65 to the amplifier 63.

[0044] The DC power supply 65 is a device that outputs a DC voltage or a DC current to be supplied to the amplifier 63. The DC power supply 65 may have a configuration that switches between supplying and stopping the DC voltage or the DC current.

[0045] Amplifier 63 is an electronic component that amplifies a transmission signal and is driven by a DC voltage or DC current supplied from DC power supply 65. Amplifier 63 is configured to receive a transmission signal from branching filter 50 and to output the amplified transmission signal to antenna 70.

[0046] The multiple antennas 70 are electronic components that emit radio waves based on an input transmission signal. The antennas 70 of this embodiment are configured to be detachably attached to the DC power supply connection terminals 60, and are configured to receive transmission signals from the DC power supply connection terminals 60. The antennas 70 may also be configured to be detachably attached to the duplexer 50.

[0047] The antenna 70 has a predetermined antenna directivity and is preferably capable of emitting radio waves in a band of 100 MHz or more, and more preferably capable of emitting radio waves in a band of 915 MHz or more and 5.8 GHz or less.

[0048] The antenna 70 in this embodiment is a pole antenna. The antenna 70 may also be a loop antenna. The multiple antennas 70 may all be the same type of antenna, some may be different types of antennas, or all may be different types of antennas.

[0049] Next, we will explain the radiation of radio waves from the antenna-equipped cable 10 configured as described above. For example, we will explain the case where radio waves with a frequency of 920 MHz are radiated from the two antennas 70, 70 on the signal source 11 side, and radio waves with a frequency of 2.45 GHz are radiated from the two antennas 70, 70 on the terminator 40 side.

[0050] The signal source 11 outputs a transmission signal that is a mixture of a transmission signal with a frequency of 920 MHz and a transmission signal with a frequency of 2.45 GHz. The output transmission signal propagates through the input terminal 30 and the first signal transmission cable 20A.

[0051] The transmission signal propagated through the first signal transmission cable 20A is input to the first branching filter 50 seen from the signal source 11 side. The first branching filter 50 branches off a transmission signal having a frequency of 920 MHz from the mixed transmission signal and outputs it to the DC power supply connection terminal 60. The first branching filter 50 also branches off a signal having half the strength of the input 920 MHz transmission signal and outputs it to the DC power supply connection terminal 60.

[0052] The demultiplexed transmission signal is amplified at the DC power supply connection terminal 60 and output to the antenna 70. The amplification factor of the transmission signal at the DC power supply connection terminal 60 may be a predetermined amplification factor or may be an amplification factor selected from among changeable amplification factors. The amplified transmission signal is input to the antenna 70 and emitted from the antenna 70 as a radio wave with a frequency of 920 MHz.

[0053] The remaining transmission signal that has not been demultiplexed by the first demultiplexer 50 is output to the second signal transmission cable 20B from the first demultiplexer 50. The remaining transmission signal propagates through the second signal transmission cable 20B and is input to the second demultiplexer 50 as seen from the signal source 11 side.

[0054] The second branching filter 50 branches the 920 MHz transmission signal from the mixed transmission signal and outputs it to the DC power supply connection terminal 60. The explanation after output to the DC power supply connection terminal 60 is the same as for the first branching filter 50, so it will not be repeated.

[0055] The remaining transmission signal that was not branched by the second branching filter 50, i.e., the transmission signal with a frequency of 2.45 GHz, is output to the second signal transmission cable 20B from the second branching filter 50. The transmission signal propagates through the second signal transmission cable 20B and is input to the third branching filter 50 as seen from the signal source 11 side.

[0056] The third branching filter 50 branches a signal with half the strength of the input 2.45 GHz transmission signal and outputs it to the DC power supply connection terminal 60. The explanation after output to the DC power supply connection terminal 60 is the same as for the first branching filter 50, so it will not be repeated.

[0057] The remaining transmission signal that has not been branched by the third branching filter 50 is output to the second signal transmission cable 20B from the third branching filter 50. The transmission signal propagates through the second signal transmission cable 20B and is input to the fourth branching filter 50 as seen from the signal source 11 side.

[0058] The fourth duplexer 50 demultiplexes the input 2.45 GHz transmission signal and outputs the demultiplexed signal to the DC power supply connection terminal 60. The description after the signal is output to the DC power supply connection terminal 60 is the same as that for the first duplexer 50, and therefore will not be repeated.

[0059] Next, a method for installing the cable with antenna 10 having the above configuration and a method for changing the range of radio waves will be described. First, a method for installing the cable with antenna 10 will be described, and then a method for changing the range of radio waves will be described.

[0060] First, the input terminal 30 of the antenna-equipped cable 10 is connected to the signal source 11 . Next, the wiring shape of the signal transmission cable 20 is adjusted so that a predetermined antenna directivity is obtained. Specifically, the position where the signal transmission cable 20 is to be placed is determined based on the range over which the radio waves are to be transmitted. Because the signal transmission cable 20 is flexible, the signal transmission cable 20 can be placed in a three-dimensional manner.

[0061] The attitude of the antenna 70 is determined based on the antenna directivity and radio wave transmission range of the antenna 70. Because the signal transmission cable 20 is flexible, the attitude of the antenna 70 can be set to any attitude regardless of the arrangement of the signal transmission cable 20.

[0062] As described above, the input terminal 30 may be connected to the signal source 11 before the antenna cable 10 is placed, or the input terminal 30 may be placed on the signal source 11 after the antenna cable 10 is fixed.

[0063] An example of a case where the range of radio waves can be changed is when the layout of the space in which the antenna-equipped cable 10 is placed (for example, the indoor layout) is changed. When the layout is changed, areas where radio waves cannot reach may occur. In this case, work is performed to change the range of radio waves.

[0064] The work of changing the range of radio waves is carried out by changing at least one of the position of the signal transmission cable 20 and the attitude of the antenna 70. The position of the signal transmission cable 20 and the attitude of the antenna 70 are changed so that the radio waves can reach areas where they cannot reach.

[0065] The signal transmission cable 20 is flexible, so its position can be changed. The position can be changed in all three-dimensional directions. The attitude of the antenna 70 can also be changed in all three-dimensional directions.

[0066] The range of radio waves may be changed by switching on and off the supply of DC power supply 65 connected to DC power supply connection terminal 60. The antenna-equipped cable 10 may be installed taking into consideration the difference in the range of radio waves that occurs when DC power supply 65 is supplied and stopped.

[0067] For example, by supplying a DC voltage or DC current from the DC power supply 65, the transmission signal input to the antenna 70 is amplified. When the transmission signal is amplified, the strength of the radio waves (also referred to as electric field strength) emitted from the antenna 70 increases. In other words, the radio waves can reach farther, and the range of the radio waves increases. When the supply of DC voltage or DC current from the DC power supply 65 is stopped, the range of the radio waves narrows.

[0068] As described above, the supply and stop of the DC voltage or DC current may be switched from the DC power supply 65, or the supply and stop of the DC voltage or DC current may be switched by connecting and disconnecting the DC power supply 65 to the DC power supply connection terminal 60.

[0069] According to the antenna-equipped cable 10 having the above configuration, the multiple antennas 70 are arranged on the signal transmission cable 20. Because the signal transmission cable 20 is flexible, it is easy to change the position and orientation of the multiple antennas 70 even after they have been installed. This makes it easy to widen the adjustment range of the antenna directivity. It also makes it easy to change the range over which radio waves can be received.

[0070] By providing the DC power supply connection terminal 60, it is possible to amplify the transmission signal input to the antenna 70. By amplifying the transmission signal, it becomes easier to widen the range over which the radio waves emitted from the antenna 70 can reach. This makes it easier to widen the adjustment range of the antenna directivity. It also makes it easier to change the range over which the radio waves can reach.

[0071] Making the terminator 40 replaceable makes it possible to change the field strength radiated from the antenna 70. For example, by replacing the terminator 40 with a terminator 40 having a 50 Ω terminating resistance with another terminator 40, such as an open terminator 40 or a short-circuited terminator 40, it is possible to change the field strength radiated from the antenna 70.

[0072] By providing the DC power supply 65, it is possible to select whether to supply or stop the DC voltage or DC current to the DC power supply connection terminal 60. In other words, it is possible to arbitrarily set the antenna 70 to strengthen or weaken the radiated electric field strength.

[0073] By using a leaky coaxial cable for at least a portion of the signal transmission cable 20, radio waves can be emitted from between the multiple antennas 70. In other words, even if the position or orientation of the multiple antennas 70 is changed, radio waves can be delivered to areas that are difficult for radio waves to reach.

[0074] FIG. 5 is a schematic diagram illustrating the configuration of an antenna-equipped cable 10 in which two first signal transmission cables 20A, 20A extend from one input terminal 30. As shown in FIG.

[0075] In the antenna-equipped cable 10 of the above-described embodiment, one first signal transmission cable 20A extends from one input terminal 30, but multiple first signal transmission cables 20A may extend from one input terminal 30. For example, as shown in Fig. 5, two first signal transmission cables 20A, 20A may extend.

[0076] Fig. 6 is a schematic diagram illustrating the configuration of an antenna-equipped cable 10 in which a branching device 80 is provided on a first signal transmission cable 20. Fig. 7 is a schematic diagram illustrating the configuration of an antenna-equipped cable 10 in which a branching device 80 is provided on a second signal transmission cable 20B.

[0077] The antenna-equipped cable 10 may also be provided with a branching device 80, as shown in Figures 6 and 7. The branching device 80 is an electronic device configured to branch an input transmission signal into multiple signals at a predetermined signal strength ratio. Figures 6 and 7 show the branching device 80 that branches an input transmission signal into two signals.

[0078] The branching device 80 may be disposed in the first signal transmission cable 20A as shown in Fig. 6, or may be disposed in the second signal transmission cable 20B as shown in Fig. 7. The second signal transmission cable 20B on which the branching device 80 is disposed may be the cable closest to the input terminal 30 among the second signal transmission cables 20B disposed between the branching filters 50, or may be any other cable.

[0079] By providing the branching device 80, it becomes easier to widen the range in which the antenna-equipped cable 10 can be installed, and it becomes easier to widen the range in which multiple antennas 70 can be arranged. In other words, it becomes easier to make changes to widen the range in which radio waves can reach.

[0080] For example, by providing the branching switch 80, it is possible to expand the range of radio waves from the range of only one hallway to a range that includes one or more rooms connected to the hallway, and also to expand the range from the range of only one hallway to a range that includes multiple hallways branching off from that hallway.

[0081] FIG. 8 is a schematic diagram illustrating the configuration of an antenna-equipped cable 10 in which an application terminal 90 is provided on a second signal transmission cable 20B.

[0082] The antenna-equipped cable 10 may also be provided with an application terminal 90, as shown in Fig. 8. The application terminal 90 is an electronic component that is connected to the signal transmission cable 20 so as to be able to input and output transmission signals, and is configured to amplify and output the input transmission signals.

[0083] 8 shows a configuration in which an application terminal 90 is arranged on a second signal transmission cable 20B. Specifically, the configuration shows the application terminal 90 being arranged between the second signal transmission cable 20B connected to the second branching filter 50 counting from the input terminal 30 side and the second signal transmission cable 20B connected to the third branching filter 50. Note that the application terminal 90 may also be arranged between the third branching filter 50 and the fourth branching filter 50.

[0084] The application terminal 90 is configured to receive a supply of DC current or DC voltage from the DC power supply 65 or a DC power supply 95 different from the DC power supply 65. The application terminal 90 is configured to amplify a transmission signal based on the supplied DC current or DC voltage.

[0085] 8 shows the configuration of the application terminal 90, which receives a DC current or a DC voltage from another DC power supply 95. A transmission signal is input to the application terminal 90 from the second signal transmission cable 20B connected to the second branching filter 50. The application terminal 90 amplifies the input transmission signal based on the supplied DC current or DC voltage. The amplified transmission signal is output to the second signal transmission cable 20B connected to the third branching filter 50.

[0086] Providing the application terminal 90 makes it easier to widen the range of radio waves that can be received from the antenna 70 to which the transmission signal output from the application terminal 90 is input. In the cable with antenna 10 shown in Fig. 8, it is easier to widen the range of radio waves that can be received from the third antenna 70 and the fourth antenna 70 counting from the input terminal 30 side.

[0087] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, the present disclosure is not limited to applications of the above-described embodiments, and may be applied to embodiments in which these embodiments are appropriately combined, and is not particularly limited. [Explanation of symbols]

[0088] 10...antenna-equipped cable, 11...signal source, 20...signal transmission cable, 21...first end, 22...second end, 30...input terminal, 40...terminator, 50...splitter, 60...DC power supply connection terminal, 65...DC power supply, 70...antenna, 80...splitter, 90...application terminal, 95...other DC power supply

Claims

1. a signal transmission cable formed in a long, flexible shape; an input terminal provided at a first end portion of the signal transmission cable, to which a transmission signal is input from a signal source; a terminator disposed at a second end of the signal transmission cable, the second end being different from the first end; a plurality of branching filters disposed at intervals between the input terminal and the terminator in the signal transmission cable, each branching filter performing at least one of dividing the transmission signal at a predetermined signal strength ratio and dividing a part of a plurality of signals mixed into the transmission signal; a plurality of antennas for emitting radio waves based on the transmission signals split by the splitter; a DC power supply connection terminal disposed between at least one of the plurality of branching filters and the antenna to which the transmission signal branched by the branching filter is input, the DC power supply connection terminal superimposing a DC voltage or a DC current supplied from a DC power supply on the transmission signal and outputting the superimposed DC voltage or DC current to the antenna; A cable with an antenna having:

2. 2. The antenna-equipped cable according to claim 1, wherein the terminator is replaceably disposed on the second end.

3. the DC power supply is further provided, the DC power supply having a configuration that is detachably attached to the DC power supply connection terminal and that supplies the DC voltage or the DC current to the DC power supply connection terminal; 2. The antenna-equipped cable according to claim 1, wherein the DC power supply is configured to be able to switch between supplying and stopping the DC voltage or the DC current.

4. 2. The antenna-equipped cable according to claim 1, wherein the signal transmission cable is provided with a branching device for branching the input transmission signal into a plurality of signals at a predetermined signal strength ratio.

5. 5. The antenna-equipped cable according to claim 1, wherein the signal transmission cable is at least partially a leaky coaxial cable that emits radio waves based on the transmission signal.

6. The signal transmission cable is provided with an application terminal for superimposing a DC voltage or a DC current supplied from the DC power source or a DC power source different from the DC power source on the transmission signal. The antenna-equipped cable according to any one of claims 1 to 4.

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