WO2011129264A1

WO2011129264A1 - Cable assembly, and antenna system using same

Info

Publication number: WO2011129264A1
Application number: PCT/JP2011/058838
Authority: WO
Inventors: 滋中崎
Original assignee: 株式会社フジクラ
Priority date: 2010-04-16
Filing date: 2011-04-07
Publication date: 2011-10-20
Also published as: JP2011228032A; TW201205985A

Abstract

Provided are a cable assembly which can realize an antenna system by which an excellent high-speed communication is allowed, and an antenna system using the cable assembly. A cable assembly (1) is provided with a coaxial cable (10) having a center conductor (11), an insulation layer (12) covering the outer periphery of the center conductor (11), an outer conductor (13) covering the outer periphery of the insulation layer (12), and a sheath (14) covering the outer conductor (13); and a connector (20) having a signal terminal (21) and a ground terminal (22). In the end portion of the coaxial cable (10), the outer conductor (13) is exposed from the sheath (14) and electrically connected to the ground terminal (22). The center conductor (11) is extended from the end portion of the outer conductor (13), and at least a part of the center conductor is exposed and connected to the signal terminal (21). The distance from the end portion of the outer conductor (13) to the connection between the center conductor (11) and the signal terminal (21) is 0.40-0.85 mm.

Description

Cable assembly and antenna system using the same

The present invention relates to a cable assembly and an antenna system using the same, and more particularly to a cable assembly capable of realizing an antenna system capable of good high-speed communication and an antenna system using the same.

Currently, antennas used in small electronic devices such as mobile phones and mobile personal computers are generally electrically connected to a conductive line having an impedance of 50Ω provided on a wiring board. And when the conducting line of this wiring board and the conducting line of another wiring board are electrically connected, the conducting lines of each wiring board may be connected by a coaxial cable. In this case, a coaxial cable having an impedance of 50Ω is generally used to match the impedance of the conductive line of each wiring board with the impedance of the coaxial cable.

The following Patent Document 1 describes an example of such a coaxial cable. In the coaxial cable described in the following Patent Document 1, the lead is provided at the end portion on the side connected to the wiring board. In this lead-out, the outer conductor is exposed from the sheath, the insulating layer is exposed from the outer conductor, and the central conductor is exposed from the insulating layer. The exposed external conductor is connected to the ground terminal of the wiring board by soldering, and the central conductor is connected to the signal terminal of the wiring board by soldering.

Japanese Patent Laid-Open No. 2003-45224

By the way, in recent years, communication technology using frequency multiplexing schemes such as OFDM (Orthogonal Frequency Division Division Multiplexing) such as WiMAX (Worldwide Interoperability for Microwave Access) has been used as high-speed communication of small electronic devices. In such a communication technique, a signal having a frequency of 100 kHz to 12 GHz is transmitted and received by an antenna. When the frequency band transmitted and received by the antenna becomes wider in this way, impedance mismatching tends to occur in the conductive line of the wiring board and the coaxial cable in the high frequency region. When this impedance mismatch occurs, standing waves become conspicuous, communication in the high frequency region is hindered, and high-speed communication of the electronic device may be hindered. One index indicating the impedance matching is VSWR (Voltage Standing Wave Ratio). In general, a VSWR of 1.60 or less is one of the guidelines for performing high-speed communication with an antenna.

However, even if the impedance of the conductive line of the wiring board and the impedance of the coaxial cable are matched, at the end of the coaxial cable connected to the terminal of the wiring board, the central conductor partially covered with the insulating layer is Derived from the end of the outer conductor. The center conductor derived from such an external conductor tends to cause impedance mismatch because the center conductor is not shielded by the external conductor. Even in the coaxial cable of Patent Document 1, the VSWR may be larger than 1.60 at the end of the coaxial cable. In such a case, there is a possibility that good high-speed communication may be hindered.

Therefore, an object of the present invention is to provide a cable assembly that can realize an antenna system capable of good high-speed communication, and an antenna system using the cable assembly.

In order to solve the above-mentioned problems, the present inventor has conducted intensive research so that impedance mismatch does not occur in a portion where the conductive line of the substrate and the coaxial cable are connected. In the portion where the center conductor is covered with the outer conductor, the impedance is matched, and after the center conductor is connected to the signal terminal, the impedance of the signal terminal becomes dominant. Therefore, if the length from when the center conductor is led out from the end of the outer conductor to when it is connected to the signal terminal is shortened, impedance mismatching is less likely to occur, and the above problem can be solved. Therefore, a connector having a signal terminal and a ground terminal, and a leaded coaxial cable are prepared, the external conductor is connected to the ground terminal of the connector, the center conductor is connected to the signal terminal of the connector, and the cable is connected. An assembly was made. At this time, it was thought that the problem of impedance mismatch was solved by shortening the distance from the end of the outer conductor until the central conductor was connected to the signal terminal. However, it has been clarified that, at a specific frequency, when the distance is shortened from the end of the outer conductor until the center conductor is connected to the signal terminal, impedance mismatch occurs. Therefore, the present inventor has conducted further research and has come to make the present invention.

That is, the coaxial cable of the present invention includes a center conductor, an insulating layer that covers the outer periphery of the center conductor, an outer conductor that covers the outer periphery of the insulating layer, and a sheath that covers the outer conductor. A coaxial cable having an impedance of 50Ω at a frequency of 12 GHz or less, a signal terminal and a ground terminal, and a connector having an impedance of 50Ω at a frequency of 100 kHz or more and 12 GHz or less, and at the end of the coaxial cable, The outer conductor is exposed from the sheath and electrically connected to the ground terminal, the center conductor is led out from an end of the outer conductor, and at least a part is exposed and connected to the signal terminal, The distance from the end of the outer conductor to the center terminal being connected to the signal terminal is 0.40 mm or more and 0 .85 mm or less.

According to such a cable assembly, the coaxial cable and the connector are both impedance-matched at a frequency of 100 kHz to 12 GHz and impedance matching is achieved. When a signal having a frequency of 100 kHz to 12 GHz is applied to the signal terminal of the connector, the distance from the end of the external conductor to the center conductor is connected to the signal terminal is 0.40 mm to 0.85 mm. Therefore, the VSWR at the end of the coaxial cable can be made 1.60 or less. As described above, such a VSWR is required to be 1.60 or less as an antenna line used for high-speed communication. Therefore, in such a cable assembly, a standing wave due to impedance mismatch when performing high-speed communication can be suppressed to a sufficient level. Therefore, by using such a cable assembly, an antenna system capable of good high-speed communication can be realized.

Further, in the cable assembly, the insulating layer is exposed from an end portion of the outer conductor, and a part of the outer conductor side in a portion where the center conductor is led out from the end portion of the outer conductor is It is preferable that it is covered with the insulating layer.

According to such a cable assembly, since the insulating layer covers the central conductor between the portion where the central conductor is exposed from the end of the external conductor, a short circuit between the external conductor and the central conductor is prevented. be able to.

In the cable assembly, it is preferable that the outer conductor is composed of a metal braid and a metal that fills a gap between the metal braids.

According to such a coaxial cable, since the plurality of wires of the metal braid are integrated by the metal filling the gaps of the metal braid, when the external conductor is exposed, the external conductor is not separated and the workability is improved. Can be made.

Further, an antenna system of the present invention is a wiring board having the above cable assembly, a conductive line having an impedance of 50Ω electrically connected to the signal terminal, and a ground body electrically connected to the ground terminal. And an antenna that performs communication at a frequency of 100 kHz to 12 GHz and is electrically connected to the conductive line.

According to such an antenna system, the impedance of the coaxial cable and the conductive line is both 50Ω, and further, the VSWR at the end of the coaxial cable can be 1.60 or less. Standing waves can be suppressed and good high-speed communication can be performed.

As described above, according to the present invention, a cable assembly capable of realizing an antenna system capable of good high-speed communication and an antenna system using the same are provided.

It is a figure which shows the cable assembly which concerns on embodiment of this invention. It is a figure which shows a mode that the antenna system which concerns on embodiment of this invention is assembled. It is a figure which shows the relationship between the frequency of the signal transmitted by the cable assembly of FIG. 1, and VSWR in the edge part of a coaxial cable for every distance until the center conductor is connected to the signal terminal from the edge part of an outer conductor. It is a figure which shows the relationship between the distance from the edge part of the outer conductor of FIG. 1 until a center conductor is connected to a signal terminal, and VSWR in the edge part of a coaxial cable for every frequency.

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

FIG. 1 is a view showing a cable assembly according to an embodiment of the present invention. As shown in FIG. 1, the cable assembly 1 includes a coaxial cable 10 and a connector 20.

The coaxial cable 10 includes a center conductor 11, an insulating layer 12 that covers the outer periphery of the center conductor 11, an outer conductor 13 that covers the outer periphery of the insulating layer 12, and a sheath 14 that covers the outer conductor 13.

The center conductor 11 is composed of a plurality of conductive wire strands. The diameter of the center conductor 11 is not particularly limited, but is preferably 0.075 mm to 0.15 mm from the viewpoint of keeping VSWR low while contributing to space saving. The material of the center conductor 11 is not particularly limited as long as it is a conductor, and examples thereof include copper and nickel.

The insulating layer 12 covering the central conductor 11 is made of an insulating resin. The outer diameter of the insulating layer 12 is not particularly limited, but being 0.165 mm to 0.4 mm contributes to space saving as well as the reason for the preferable diameter of the central conductor 11 described above. From the viewpoint of keeping VSWR low. The material of the insulating layer 12 is not particularly limited as long as it is an insulating resin, and examples thereof include polyolefin resins. Examples of polyolefin resins include ethylene propylene copolymer resins, polypropylene, polyethylene, or And a mixture thereof.

The outer conductor 13 covering the insulating layer 12 is composed of a metal braid. The metal braid is, for example, one in which a large number of metal wires having a diameter of 0.1 mm or less are knitted. In addition, it is preferable that the outer conductor 13 has a gap between the metal braided wires filled with metal. That is, the coaxial cable 10 is preferably a so-called semi-flexible coaxial cable. With this configuration, the plurality of wires of the metal braid are integrated with the metal that fills the gaps in the metal braid, so that when the external conductor 13 is exposed, the external conductor 13 does not fall apart and the workability is improved. Can be improved. Examples of the metal that fills the gap in the metal braid include tin and solder. And the metal which fills the clearance gap of a metal braid is filling the clearance gap of a metal braid by coat | covering the wire of a metal braid by plating, for example. The outer diameter of the outer conductor is not particularly limited. For example, when the diameter of the center conductor 11 is 0.075 mm to 0.15 mm as described above, the outer diameter is set to 0.29 mm to 0.83 mm. The

The sheath 14 is formed of a thermoplastic resin. Examples of such thermoplastic resins include fluorine such as polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PTA), and tetrafluoroethylene-ethylene copolymer (ETFE). Resins can be mentioned.

The coaxial cable 10 having such a configuration is adjusted to have an impedance of 50Ω at least at 100 kHz to 12 GHz.

And, the coaxial cable 10 is lead out at the end. By this lead-out, the outer conductor 13 is exposed from the sheath 14, the insulating layer 12 is exposed from the outer conductor 13, and the center conductor 11 is exposed from the insulating layer 12. As a result of the insulating layer 12 being exposed from the outer conductor 13 in this way, a portion of the outer conductor side of the portion where the central conductor 11 is led out from the end of the outer conductor 13 is covered with the insulating layer 12. And the center conductor 11 can be prevented from being short-circuited.

The connector 20 has a ground terminal 22 and a signal terminal 21.

The ground terminal 22 of the connector 20 is composed of a metal frame having an opening 22a. A hole 22b is formed in a part of the frame of the ground terminal 22 in a direction perpendicular to the opening 22a. .

Further, the signal terminal 21 is disposed in the frame constituting the ground terminal 22 so that a part thereof is exposed from the opening 22a. A hole 21 a is formed in the signal terminal 21 along the direction in which the opening 22 a of the ground terminal 22 faces. Further, on the opposite side of the signal terminal 21 to the opening 22a side of the ground terminal 22, a fixing means 21b for fixing the central conductor 11 of the coaxial cable 10 in a direction substantially perpendicular to the hole 21a is provided.

A resin 23 is filled between the ground terminal 22 and the signal terminal 21, and the signal terminal 21 and the ground terminal 22 are insulated from each other by the resin 23. Specifically, the side opposite to the side where the hole 21 a of the signal terminal 21 is formed is covered with the resin 23. In order to fix the center conductor 11 of the coaxial cable 10 to the fixing means 21b of the signal terminal 21, the resin 23 is provided with a hole 23b into which the center conductor 11 is inserted. A part of the resin 23 is exposed from the hole 22 b of the ground terminal 22 so that the hole 23 b formed in the resin 23 is exposed from the hole 22 b formed in the ground terminal 22.

Further, on the side where the hole 21a of the signal terminal 21 is formed, a hole 23a is formed in the resin 23, and a part of the signal terminal 21 is arranged and exposed in the hole 23a, and the signal terminal A part of 21 and the resin 23 are separated.

Furthermore, a part of the metal frame forming the ground terminal 22 extends along the direction in which the hole 22b of the ground terminal 22 faces, and the cable fixing portion 24 is formed. Accordingly, the cable fixing portion 24 is electrically connected to the ground terminal 22. A caulking portion 26 is formed in the cable fixing portion 24, and the caulking portion 26 is configured to caulk the outer conductor 13 of the coaxial cable 10 to fix the coaxial cable 10 and the connector 20. .

The connector 20 having such a configuration is adjusted so that the impedance is 50Ω at least from 100 kHz to 12 GHz.

The outer conductor 13 exposed from the sheath 14 is caulked by the caulking portion 26 at the end portion of the coaxial cable 10 led out as described above, and is further led out from the end portion of the outer conductor 13 and at least a part thereof. The exposed central conductor 11 is fixed to the fixing means 21 b of the signal terminal 21 through the hole 23 b of the resin 23. In this way, the external conductor 13 is electrically connected to the ground terminal 22, and the central conductor 11 is connected to the signal terminal 21 to form the cable assembly 1. At this time, in the cable assembly 1, the distance L from the end of the external conductor 13 until the center conductor 11 is connected to the signal terminal 21 is 0.40 mm or more and 0.85 mm or less.

Next, an antenna system using such a cable assembly 1 will be described.

FIG. 2 is a diagram showing how the antenna system according to the embodiment of the present invention is assembled. As shown in FIG. 2, the antenna system of the present embodiment includes a wiring board 30, a socket 40 mounted on the wiring board 30, an antenna 50 mounted on the wiring board 30, and a connector connected to the socket 40. The above-described cable assembly 1 to which 20 is connected is provided as a main configuration.

As shown in FIG. 2, the wiring substrate 30 includes a flat substrate 31, a ground land 34 provided on one surface of the substrate 31, and a signal land 32 provided on one surface of the substrate 31. A conductive line 33 provided on one surface of the substrate 31 and connected to the signal land 32, a ground layer 35 as a ground body provided on the other surface of the substrate 31, and a ground layer 35 And a through conductor 36 that electrically connects the ground land 34 as a main component.

The substrate 31 is, for example, a substrate in which glass fiber is impregnated with an epoxy resin. The ground land 34, the signal land 32, the conductive line 33, and the ground layer 35 are made of metal foil such as metal plating or copper foil, and the through conductor 36 is a via made of metal such as copper. It consists of through holes. The ground layer 35 is provided on substantially the entire other surface of the substrate 31. The ground layer 35 is grounded by means not shown. The conducting line 33 is a line whose impedance is adjusted to 50Ω at least from 100 kHz to 12 GHz.

Further, the antenna 50 mounted on the wiring board 30 is electrically connected to the conductive line 33. In the present embodiment, the antenna 50 is a so-called patch antenna having a configuration in which a radiating conductor 52 and a feed line 53 are provided on a base 51. The feed line 53 of the patch antenna is electrically connected to the conductive line 33 by solder (not shown). And the antenna 50 communicates in the frequency band of 100 kHz to 12 GHz by transmitting a signal of 100 kHz to 12 GHz from the feeder line.

Further, the socket 40 mounted on the wiring board 30 is provided with a signal connection portion 41 in a ground connection portion 42 formed of a metal frame, and the ground connection portion 42 and the signal connection portion 41 are provided. Are insulated from each other by a resin 45. A ground terminal 44 is connected to the ground connection portion 42, and the ground terminal 44 and the ground land 34 of the wiring board 30 are electrically connected by solder (not shown). In addition, a signal terminal 43 is connected to the signal connection portion 41, and the signal terminal 43 and the signal land 32 of the wiring board 30 are electrically connected by solder (not shown).

Then, the connector 20 is moved and fixed to the socket 40 as shown by the arrow in FIG. 2 so that the ground terminal 22 of the connector 20 and the ground connection portion 42 of the socket 40 are fitted. At this time, the ground connection portion 42 of the socket 40 enters the opening 22a formed in the ground terminal 22 of the connector 20, and the ground terminal 22 and the ground connection portion 42 are fitted to each other and are electrically connected. Accordingly, the ground terminal 22 is electrically connected to the ground layer 35. Further, the signal connection portion 41 of the socket 40 enters the hole 21a formed in the signal terminal 21 of the connector 20, and the signal terminal 21 and the signal connection portion 41 are fitted to each other and are electrically connected to each other. Therefore, the signal terminal 21 and the conductive line 33 are electrically connected. Thus, the cable assembly 1 is mounted on the wiring board 30 on which the antenna 50 is mounted, and an antenna system is obtained.

Then, when a signal of 100 kHz to 12 GHz is transmitted to the central conductor 11 of the coaxial cable 10, communication is performed by the antenna 50 through the conductive line 33 of the wiring board 30.

Next, the relationship between the distance L from the end of the outer conductor in FIG. 1 until the center conductor is connected to the signal terminal and the VSWR at the end of the coaxial cable 10 in the cable assembly 1 will be described. 3 shows the relationship between the frequency of the signal transmitted by the cable assembly 1 of FIG. 1 and the VSWR at the end of the coaxial cable 10, and the central conductor 11 is connected to the signal terminal 21 from the end of the external conductor 13. It is a figure shown for every distance L. Specifically, for each cable assembly 1 having a distance L of 0.25 mm, 0.75 mm, 1.25 mm, and 1.75 mm, the horizontal axis represents frequency, the vertical axis represents VSWR, and the frequency and VSWR Showing the relationship.

Here, the length at which the insulating layer 12 is exposed from the outer conductor 13 is changed to 0 mm, 0.5 mm, 1.0 mm, and 1.5 mm, and the center until the insulating layer 12 is exposed from the insulating layer 12 and connected to the signal terminal 21. By setting the length of the conductor 11 to 0.25 mm, the distance L was set to 0.25 mm, 0.75 mm, 1.25 mm, and 1.75 m as described above. The length of the external conductor 13 exposed from the sheath 14 was 2.09 mm, and the length of the entire central conductor 11 exposed from the insulating layer 12 was 1.2 mm.

In addition, it depends on the design of the connector 20 except for the distance L from the end of the external conductor 13 until the central conductor 11 is connected to the signal terminal 21, and is not particularly limited. Further, the length of the insulating layer 12 exposed from the external conductor 13 is not particularly limited as long as the central conductor 11 and the external conductor 13 are not short-circuited and do not obstruct the connection between the central conductor 11 and the signal terminal 21.

As is apparent from FIG. 3, in the cable assembly 1 having the distance L of 1.75 mm, the VSWR may be larger than 1.60 when the frequency is about 8.8 GHz or more. Similarly, in the cable assembly 1 having the distance L of 1.25 mm, the VSWR may be larger than 1.60 when the frequency is about 8.9 GHz or more. Further, in the cable assembly 1 having a distance L of 0.25 mm, the VSWR becomes larger than 1.60 from about 7.4 GHz to about 7.6 GHz. On the other hand, in the cable assembly 1 having a distance L of 0.75 mm, the VSWR does not exceed 1.60 at 100 kHz to 12 GHz, which is a frequency necessary for performing high-speed communication. Thus, in the cable assembly 1, when the distance L is near 0.75 mm, it turns out that VSWR shows a favorable value.

Next, the range of the distance L where the VSWR does not exceed 1.60 will be described in more detail with reference to FIG. FIG. 4 is a diagram showing the relationship between the distance L from the end of the outer conductor 13 of FIG. 1 until the central conductor 11 is connected to the signal terminal 21 and the VSWR at the end of the coaxial cable 10 for each frequency. Specifically, the values of VSWR when the distance L is 0.25 mm, 0.75 mm, 1.25 mm, and 1.75 mm at frequencies of 100 kHz and 0.1 GHz intervals from 0.1 GHz to 12 GHz. The plot is made by connecting each plot at each frequency with a straight line. In FIG. 4, in order to grasp the overall tendency of VSWR, each frequency in the plotted graph is not mentioned unless otherwise specified.

As shown in FIG. 4, when the coaxial cable 10 transmits a signal having a frequency of 100 kHz to 12 GHz, when the distance L is 0.40 mm or more and 0.85 mm or less, the VSWR at the end of the coaxial cable 10 is 1.60 or less.

The frequency at which the VSWR has the highest value when the distance L is 0.40 mm is 7.5 GHz as shown in FIG. Here, at a frequency of 7.5 GHz, the value of VSWR when the distance L is 0.25 mm is 1.66, and the value of VSWR when the distance L is 0.75 mm is 1.45. Therefore, when the value of VSWR is plotted at a frequency of 7.5 GHz and the distance L is 0.25 mm and 0.75 mm, and these plots are connected by a straight line, this straight line is obtained when the distance L is 0.40 mm. The value of VSWR shown is 1.597.

On the other hand, the frequency at which the VSWR is the highest when the distance L is 0.85 mm is 10.8 GHz as shown in FIG. Here, at a frequency of 10.8 GHz, the value of VSWR when the distance L is 0.75 mm is 1.52, and the value of VSWR when the distance L is 1.25 mm is 1.91. Therefore, when the value of VSWR is plotted at a frequency of 10.8 GHz and the distance L is 0.75 mm and 1.25 mm and these plots are connected by a straight line, this straight line is obtained when the distance L is 0.85 mm. The value of VSWR shown is 1.598.

Therefore, when the cable assembly 1 shown in FIG. 1 transmits a signal having a frequency of 100 kHz to 12 GHz necessary for high-speed communication, the VSWR at the end of the coaxial cable 10 is 1.60 or less. The distance L is 0.40 mm or more and 0.85 mm or less.

As described above, according to the cable assembly 1 according to the present embodiment, the impedance is matched in the portion where the center conductor 11 is covered with the outer conductor 13, and the center conductor 11 is connected to the signal terminal 21. After being connected, the impedance of the signal terminal 21 becomes dominant. When a signal having a frequency of 100 kHz or more and 12 GHz or less is applied to the signal terminal 21 of the connector 20, the distance L from the end of the outer conductor 13 to the center terminal 11 is connected to the signal terminal 21 is 0.40 mm. Since it is 0.85 mm or less, the VSWR at the end of the coaxial cable 10 can be 1.60 or less. As described above, such a VSWR is required to be 1.60 or less as an antenna line used for high-speed communication. Therefore, in such a cable assembly 1, standing waves due to impedance mismatching when performing high-speed communication can be suppressed to a sufficient level. Therefore, by using such a cable assembly 1, an antenna system capable of good high-speed communication can be realized.

According to the antenna system using such a cable assembly 1, both the impedance of the coaxial cable 10 and the conductive line 33 are 50Ω, and the VSWR at the end of the coaxial cable 10 can be 1.60 or less. Therefore, the standing wave due to impedance mismatching can be suppressed as a whole, and good high-speed communication can be performed.

As mentioned above, although this invention was demonstrated to the example for embodiment, this invention is not limited to these.

For example, in the above embodiment, the insulating layer is exposed at the end of the coaxial cable 10 by the lead, but the insulating layer does not necessarily have to be exposed.

Further, although the central conductor 11 of the coaxial cable 10 is composed of a plurality of conductive wire strands, it may be composed of a conductive single wire. The outer conductor 13 is composed of a metal braid and a metal that fills a gap between the metal braids, but may be composed of only a metal braid or a metal tape.

In the cable assembly 1, the connector 20 and the socket 40 are fitted, whereby the ground terminal 22 and the ground layer 35 are electrically connected, and the signal terminal 21 and the conductive line 33 are electrically connected. However, the ground terminal 22 and the ground layer 35 may be electrically connected and the signal terminal 21 and the conductive line 33 may be electrically connected by other means.

According to the present invention, a coaxial cable capable of achieving an antenna system capable of good high-speed communication, and an antenna system using the same are provided.

DESCRIPTION OF SYMBOLS 1 ... Cable assembly 10 ... Coaxial cable 11 ... Center conductor 12 ... Insulating layer 13 ... Outer conductor 14 ... Sheath 20 ... Connector 21 ... Signal terminal 22 ... Ground terminal 23 ... Resin 24 ... Cable fixing part 26 ... Caulking part 30 ... Wiring board 31 ... Board 32 ... Signal land 33 ... Conducting line 34 ... For ground Land 35 ... Ground layer 36 ... Penetration conductor 40 ... Socket 41 ... Signal connection 42 ... Ground connection 43 ... Terminal 44 ... Terminal 45 ... Resin 50 ...・ Antenna 51 ... Substrate 52 ... Radiation conductor 53 ... Feed wire

Claims

A center conductor, an insulating layer that covers the outer periphery of the center conductor, an outer conductor that covers the outer periphery of the insulating layer, and a sheath that covers the outer conductor, and has an impedance of 50Ω at a frequency of 100 kHz to 12 GHz. Coaxial cable,
A connector having a signal terminal and a ground terminal and having an impedance of 50Ω at a frequency of 100 kHz to 12 GHz;
With
At the end of the coaxial cable, the outer conductor is exposed from the sheath and electrically connected to the ground terminal, and the center conductor is led out from the end of the outer conductor and at least a part thereof is exposed. Connected to the signal terminal,
A cable assembly, wherein a distance from an end portion of the outer conductor to the central conductor being connected to the signal terminal is 0.40 mm or more and 0.85 mm or less.
The insulating layer is exposed from an end portion of the outer conductor, and a part of the outer conductor side in a portion where the central conductor is led out from the end portion of the outer conductor is covered with the insulating layer. The cable assembly according to claim 1, wherein:
The cable assembly according to claim 1 or 2, wherein the outer conductor is composed of a metal braid and a metal that fills a gap between the metal braids.
A cable assembly according to any one of claims 1 to 3,
A wiring board having a conductive line having an impedance of 50Ω electrically connected to the signal terminal, and a ground body electrically connected to the ground terminal;
An antenna that performs communication at a frequency of 100 kHz or more and 12 GHz or less, and is electrically connected to the conductive line;
An antenna system comprising: