JP2008167189A - Antenna unit, and receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reception performance by preventing the deterioration of a radiation characteristic when a connector is connected to a loop antenna which is formed on a film sheet to be stuck onto the upper part of a windshield in a vehicle. <P>SOLUTION: Each antenna unit includes: the loop antenna 10 where two power feeding terminals 11, 12 are arranged in a linear antenna conductor part 23; the connector 20 having connection terminals 31, 32 to the two power feeding terminals 11, 12; and a coaxial cable 22 to be connected to the connector. After the connector 20 is connected to the loop antenna, the coaxial cable 22 is arranged along the linear antenna conductor part 23. The connection terminal 31 away from the coaxial cable 22 in the connector 20 is connected to the external conductor 22B of the coaxial cable inside the connector 20. The connection terminal 32 close to the coaxial cable 22 is connected to the center conductor 22A of the coaxial cable inside the connector 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an antenna device and a receiving system, and in particular, a horizontally long film antenna used by being attached to an upper portion of a windshield of a vehicle, a connector connected to a feeding terminal of the film antenna, and a connector Received by an antenna device comprising a coaxial cable for guiding a signal received by an antenna to a certain processing device, and a processing device for processing a signal received by the antenna of the antenna device About the system.

  2. Description of the Related Art Conventionally, a vehicle (moving body) such as an automobile is equipped with an antenna that enables reception of radio waves while moving. Radio waves received by vehicles have been mainly AM radio wave (MW), FM radio and TV ultra-high frequency (VHF) and ultra-high frequency (UHF) for many years. On the other hand, in recent years, antennas for transmitting and receiving radio waves in a high frequency band such as antennas for GPS (Global Positioning System) and antennas for receiving digital terrestrial broadcasting (digital TV) have come to be mounted on vehicles. Yes.

  When these antennas are attached to an automobile as a moving body, the installation location of the antenna is generally a vehicle windshield or rear glass. When the antenna is attached to the windshield, the antenna is formed on a transparent film sheet and is attached to the windshield with an adhesive material (see Patent Document 1). Such a film antenna is often formed with a horizontally long loop antenna.

  FIG. 1A shows a conventional digital TV radio wave receiving film antenna 10 attached to the left and right upper portions of a windshield 1 of an automobile, and a power feeding circuit comprising a connector 20 and a coaxial cable 22 connected thereto. The arrangement | positioning of the provided antenna apparatus is shown. A signal received by the film antenna 10 is input via a connector 20 to a power feeding circuit including a coaxial cable 22. The coaxial cable 22 is disposed along the A-pillar 3 of the automobile and is connected to a tuner (not shown). Reference numeral 8 denotes a car navigation device installed on an instrument panel 9 of an automobile, to which an image signal from a tuner is input.

  FIG.1 (b) expands and shows the film antenna 10 attached to the upper left part of the windshield 1 of the motor vehicle shown to Fig.1 (a). For the film antenna 10, a loop antenna having a rectangular antenna conductor 23 is used. The loop antenna includes a rectangular antenna conductor 23 formed on a sheet-like film 24 and feeding terminals 11 and 12 that feed power to the antenna conductor 23. FIG. 1C shows a state in which the film antenna 10 on which the loop antenna shown in FIG. 1B is formed is attached to the upper right portion of the windshield of the automobile and the connector 20 is attached. The coaxial cable 22 is installed in the A pillar 3 after being attached in parallel to the roof portion 2 of the automobile. At this time, a part of the coaxial cable 22 is parallel to the antenna conductor 23 of the loop antenna.

  FIGS. 2A and 2B show the appearance of the connector 20 shown in FIGS. 1A and 1B and a state in which the connector 20 is disassembled. As shown in FIG. 2A, the connector 20 is configured by combining an inner case 21 and an outer case 25, and two openings 21 </ b> A and 21 </ b> A are formed on the surface of the inner case 21 (attachment surface to the antenna 10). There are 21B, and connecting terminals 31 and 32 having springiness protrude from the openings 21A and 21B. The surface of the inner case 21 of the connector 20 is fixed on the antenna 10 with an adhesive material such as a double-sided tape.

  As shown in FIG. 2B, the connection terminals 31 and 32 are attached on one surface of a circuit board (dielectric substrate) 30 built in the inner case 21 and the outer case 25. A coaxial cable 22 is connected to 30. An integrated circuit 40 described later is mounted on the other surface of the circuit board 30. Generally, the connection terminal 31 is a hot side (signal transmission side) terminal, and the connection terminal 32 is a ground side terminal.

  FIG. 3A shows the configuration of the circuit board 30 inside the connector 20 shown in FIG. 2B except for the inner case 21 and the outer case 25. The connection terminals 31 and 32 are attached to the back side of the circuit board 30 and led to the front side of the circuit board 30 through the through holes 33 and 34. The through hole 33 is connected to the input terminal of the integrated circuit 40 mounted on the front side of the circuit board 30, and the through hole 34 is connected to the ground wire (outer conductor) 22 </ b> B of the coaxial cable 22. The integrated circuit 40 performs processing such as amplification on the signal received by the antenna, and the processed signal is output to the central conductor (inner conductor) 22 </ b> A of the coaxial cable 22.

  FIG. 3B shows an internal configuration of the integrated circuit 40 shown in FIG. In the integrated circuit 40, there are a filter 41 connected to the antenna 10, an amplifier 42 for amplifying a signal output from the filter 41, and a filter 43 for determining a signal band output from the amplifier 42. The filter 43 blocks direct current. Is connected to the central conductor 22A of the coaxial cable 22 through a capacitor 44. The coaxial cable 22 is a power superimposed cable, and the superimposed power supply voltage (direct current) is supplied to the amplifier 42 through a coil 45 that cuts off an alternating current component.

  FIG. 3C illustrates the connection between the connector 20 shown in FIG. 2A and the film antenna 10 shown in FIG. When the connector 20 is attached to the film antenna 10, the feeding terminal 11 is connected to the central conductor 22 </ b> A of the coaxial cable through the connection terminal 31 and the integrated circuit 40 as described above. On the other hand, the power supply terminal 12 is connected to the ground wire 22 </ b> B of the coaxial cable 22 through the connection terminal 32.

  4A to 4C are adjacent to the power supply terminals 11 and 12 of the antenna 10 when the connector 20 is connected to the power supply terminals 11 and 12 of the film antenna 10 as shown in FIG. The direction of the current flowing through the antenna conductor 23 and the ground wire 22B of the coaxial cable 22 connected to the connector 20 will be described. When radio waves are received by the antenna 10, the received current flows in the direction indicated by the arrow in FIG. 4A at a certain moment, and no received current flows at the next moment as shown in FIG. 4B. At the next moment, the received current flows in the opposite direction as shown by the arrow in FIG. 4C, and this operation is repeated thereafter.

JP 2006-080999 A

  However, when the connector 20 is connected to the feeding terminals 11 and 12 of the film antenna 10 and the coaxial cable 22 is wired along the antenna conductor of the antenna 10 as shown in FIG. As shown in (a) and (c), the current flowing through the ground wire 22B of the coaxial cable 22 and the current flowing through the antenna conductor 23 adjacent to the ground wire 22B of the coaxial cable 22 are in opposite phases, and the radiation characteristics deteriorate. As a result, the reception performance of the antenna may be deteriorated.

  Therefore, the present invention provides a film antenna having a loop antenna attached to a dielectric such as a windshield of a vehicle, and a coaxial cable connected to a connector attached to a feeding terminal of the film antenna is an antenna conductor of the loop antenna. It is an object of the present invention to provide an antenna device in which the reception performance of the antenna does not deteriorate even if it is arranged in parallel.

  A first form of an antenna device according to the present invention that achieves the above object is a loop antenna having two feeding terminals, a connector having two connection terminals connected to the two feeding terminals, and connected to the connector. And a coaxial cable arranged along at least a part of the loop antenna, and a connection terminal arranged on the side far from the coaxial cable introduction portion of the connector is connected to the outer conductor of the coaxial cable, and the coaxial of the connector The connection terminal disposed on the side closer to the cable introduction portion is connected to the coaxial cable inner conductor.

  A second form of the antenna device according to the present invention that achieves the above-described object is a loop antenna having first and second feeding terminals, a connector having two connection terminals connected to the two feeding terminals, and And a coaxial cable disposed along at least a part of the loop antenna, and the first feeding terminal of the loop antenna is connected to the antenna conductor portion arranged in the vicinity of the second feeding terminal. The second feed terminal of the loop antenna is connected to an antenna conductor portion arranged in the vicinity of the first feed terminal.

  A first form of a receiving system according to the present invention that achieves the above object is a loop antenna having two power supply terminals, a connector having two connection terminals connected to the two power supply terminals, and a connector connected to the connector. And a coaxial cable disposed along at least a part of the loop antenna, and a processing means connected to the coaxial cable for processing and outputting a signal received by the loop antenna, from the coaxial cable introduction portion of the connector The connection terminal arranged on the far side is connected to the outer conductor of the coaxial cable, and the connection terminal arranged on the side closer to the introduction portion of the coaxial cable of the connector is connected to the inner conductor of the coaxial cable. To do.

  A second embodiment of the receiving system according to the present invention that achieves the above object is a loop antenna having first and second feeding terminals, a connector having two connection terminals connected to the two feeding terminals, and a connector. A coaxial cable disposed along at least a portion of the loop antenna, and a processing means connected to the coaxial cable for processing and outputting a signal received by the loop antenna. One feeding terminal is connected to an antenna conductor portion arranged in the vicinity of the second feeding terminal, and a second feeding terminal of the loop antenna is connected to an antenna conductor portion arranged in the vicinity of the first feeding terminal. It is characterized by that.

  According to the antenna device and the receiving system according to the present invention, the connector is connected to the feeding terminal of the loop antenna formed on the film attached to the upper part of the windshield, and the coaxial cable is wired along the antenna conductor. Even in this case, the current flowing through the ground wire of the coaxial cable and the current flowing through the antenna conductor adjacent to the ground wire of the coaxial cable have the same phase, the radiation characteristics are not deteriorated, and the reception performance of the antenna is improved.

  Embodiments of an antenna device and a receiving system according to the present invention will be described below in detail with reference to the accompanying drawings based on specific examples installed on a windshield of an automobile.

  As shown in FIG. 1A, the antenna device of the present invention is attached to the left and right upper portions of a windshield 1 of an automobile and receives, for example, digital TV radio waves. In addition, the receiving system of the present invention includes an antenna device including a film antenna 10 and a power feeding circuit including a connector 20 and a coaxial cable 22 connected thereto, and a signal received by the film antenna 10 of the antenna device. A tuner (not shown) corresponding to the processing means, which is input via the connector 20 and the coaxial cable 22, and a processing device 8 such as a car navigation device, which is installed on the instrument panel 9 and outputs a signal from the tuner. It is comprised from.

  In the first embodiment of the antenna device and the receiving system of the present invention, the film antenna 10 may be one in which a loop antenna is formed on the film 24 as shown in FIG. 10 power supply terminals 11 and 12 are connected. And the coaxial cable 22 connected to the connector 20 is arrange | positioned in the A pillar 3 after being attached in parallel to the antenna conductor 23 of the film antenna 10, as shown in FIG.1 (c). Note that the tuner may be built in the processing device 8, the signal processed by the tuner may be displayed as an image on the processing device 8, or audio may be output from a speaker (not shown).

  The antenna device of the present invention and the connector 20 according to the first example of the first form of the receiving system may have the configuration described in FIGS. 2A and 2B, and the configuration of the circuit board 30 is changed. Is. That is, the connector 20 of the present invention includes an inner case 21, an outer case 25, and a circuit board 30, and there are two openings 21A and 21B on the mounting surface of the inner case 21 to the antenna 10, Connection terminals 31 and 32 having springiness mounted on the substrate 30 protrude from the openings 21A and 21B. The inner case 21 and the outer case 25 are provided with a notch 26 as an introduction portion for introducing the coaxial cable 22 into the connector 20, and the coaxial cable 22 is connected to the circuit board 30. Note that the notch 26 may be provided only in one of the inner case 21 and the outer case 25.

  FIG. 5A shows the configuration of the circuit board 30 according to the first embodiment of the first mode of the present invention, and shows the surface opposite to the surface on which the connection terminals 31 and 32 are mounted. It is. On the circuit board 30, the same integrated circuit 40 as the conventional one is mounted, and a through hole 33 connected to the connection terminal 31 and a through hole 34 connected to the connection terminal 32 are provided. Since the internal circuit configuration of the integrated circuit 40 has been described with reference to FIG. 3B, the description thereof is omitted here.

  In the first embodiment, the output terminal of the integrated circuit 40 is formed by using the circuit pattern 36 formed on the circuit board 30 with the central conductor 22A of the coaxial cable 22 having the distal end located at the notch 35 of the circuit board 30. The ground wire (outer conductor) 22B of the coaxial cable 22 is connected to the through hole 33 by the ground pattern 37 formed on the circuit board 30. The input terminal of the integrated circuit 40 is connected to the through hole 34 with a circuit pattern 39. As a result, in the first embodiment, the connection terminal 31 is a ground-side terminal, and the connection terminal 32 is a hot-side (signal transmission side) terminal.

  FIG. 5B illustrates the connection between the connector 20 shown in FIG. 5A and the film antenna 10 shown in FIG. When the connector 20 is attached to the film antenna 10, in the connector 20 of the first embodiment, the feed terminal 11 is connected to the ground wire 22 </ b> B of the coaxial cable 22 through the connection terminal 31 and the ground pattern 37. On the other hand, the power supply terminal 12 is connected to the central conductor 22A of the coaxial cable through the connection terminal 32, the circuit pattern 39, the integrated circuit 40, and the circuit pattern 36.

  One of the connection between the connection terminal 31 and the ground wire 22B of the coaxial cable 22 and the connection between the connection terminal 32 and the central conductor 22A of the coaxial cable 22 are connected via a circuit pattern on the circuit board 30, and the other. May be connected by a jumper line, a wire, or the like, or both may be directly connected by a jumper line, a wire, or the like.

  FIGS. 6A to 6C are adjacent to the power supply terminals 11 and 12 of the antenna 10 when the connector 20 is connected to the power supply terminals 11 and 12 of the film antenna 10 as shown in FIG. The direction of the current flowing through the antenna conductor 23 and the ground wire 22B of the coaxial cable 22 connected to the connector 20 will be described. When radio waves are received by the antenna 10, the received current flows in the direction indicated by the arrow in FIG. 6A at a certain moment, and no received current flows at the next moment as shown in FIG. 6B. At the next moment, the received current flows in the reverse direction as shown by the arrow in FIG. 6C, and thereafter this operation is repeated.

  When the connector 20 is connected to the feeding terminals 11 and 12 of the film antenna 10 and the coaxial cable 22 is wired along the antenna conductor of the antenna 10 as shown in FIG. In the antenna device of the first embodiment, as shown in FIGS. 6A and 6C, the current flowing through the ground wire 22B of the coaxial cable 22 and the antenna conductor 23 close to the ground wire 22B of the coaxial cable 22 are connected. Since the flowing currents have the same phase, the radiation characteristics do not deteriorate and the reception performance of the antenna does not deteriorate.

  Thus, in the antenna device and the receiving system of the present invention, a film antenna having a loop antenna is attached to a dielectric such as a windshield of a vehicle and connected to a connector attached to a feeding terminal of the film antenna. Even if the coaxial cable is arranged in parallel with the antenna conductor of the loop antenna, there is no possibility that the reception performance of the antenna deteriorates.

  FIG. 7A shows the configuration of the antenna device according to the present invention and the connector 20 according to the second embodiment of the first form of the receiving system. In the second embodiment, the inner wall portion of the outer case 25 of the connector 20 including the inner case 21, the outer case 25, and the circuit board 30 is made of a conductive material such as metal corresponding to the conductor portion. An intermediate case 50 made of a member is provided. The other constituent members are the same as the constituent members described in FIG. 2B, and therefore the same members are denoted by the same reference numerals and the description thereof is omitted.

  In the second embodiment, the center conductor 22A of the coaxial cable 22 whose tip is located in the notch 35 of the circuit board 30 is not described and illustrated, but as in the first embodiment, The circuit pattern 36 formed above is used to connect to the output terminal of the integrated circuit 40. On the other hand, as shown in FIG. 7B, the ground wire (outer conductor) 22B of the coaxial cable 22 is directly connected to the intermediate case 50, and the intermediate case 50 near the connection terminal 31 is connected with a wire or the like. Connect directly to the connection terminal 31 or connect to the connection terminal 31 through a through hole. The input terminal of the integrated circuit 40 may be connected to the through hole 34 with the circuit pattern 39, as in the first embodiment.

  As a result, also in the second embodiment, the connection terminal 31 becomes a ground side terminal, and the connection terminal 32 becomes a hot side (signal transmission side) terminal. Therefore, when the connector 20 is attached to the film antenna 10, the power supply terminal 11 is connected to the ground wire 22B of the coaxial cable 22 through the connection terminal 31 and the intermediate case 50, and the power supply terminal 12 is connected to the connection terminal 32, the circuit pattern 39, and the integrated circuit. The circuit 40 and the circuit pattern 36 are connected to the central conductor 22A of the coaxial cable. Instead of the intermediate case 50, a conductor may be applied or laminated on the inner wall of the outer case 25. The intermediate case 50 can also be attached to the outer case 25 by insert molding.

  Furthermore, the intermediate case 50 may be provided on the inner case 21 side, or a conductor may be applied to the inner wall of the inner case 21 or may be laminated. The intermediate case 50 can also be attached to the inner case 21 by insert molding. When the conductive member or conductor is provided on the inner case 21 side as described above, it is necessary to prevent the conductive member or conductor from contacting the connection terminals 31 and 32.

  FIGS. 8A and 8B show the configuration of the antenna device of the present invention and the connector 20 according to the third embodiment of the first form of the receiving system. FIG. A plan view, (b) is a side view of the connector 20 shown in (a). In the third embodiment, the input terminal and the output terminal of the integrated circuit 40 on the circuit board 30 are mounted opposite to those in the first and second embodiments. Then, the coaxial cable 22 is introduced into the connector from the introduction portion formed of the notch portion 26, passes over the integrated circuit 40, enters the connector 20 longer than the entire length of the connector 20, and then the tip portion is inserted. Wrap.

  In this state, the central conductor 22A of the folded coaxial cable 22 is close to the output terminal of the integrated circuit 40, and the ground wire 22B of the coaxial cable 22 is close to the through hole 33. The input terminal of the integrated circuit 40 is close to the through hole 34. Therefore, the central conductor 22A of the coaxial cable 22 is connected to the output terminal of the integrated circuit 40 with a wire or a circuit pattern, and the ground line 22B of the coaxial cable 22 is connected to the through hole 33 with a wire or a circuit pattern. The input terminal is connected to the through hole 34.

  As a result, also in the third embodiment, the connection terminal 31 becomes a ground side terminal, and the connection terminal 32 becomes a hot side (signal transmission side) terminal. Accordingly, when the connector 20 is attached to the film antenna 10, the feeding terminal 11 is connected to the ground wire 22 </ b> B of the coaxial cable 22 via the connection terminal 31, and the feeding terminal 12 is connected to the coaxial cable through the connection terminal 32 and the integrated circuit 40. To the central conductor 22A. The central conductor 22A may be connected to the connection terminal 32 by a jumper wire, a wire, or the like without using the integrated circuit 40.

  FIGS. 9A and 9B show the configuration of the film antenna 10 according to the first and second embodiments of the second mode of the antenna device and the receiving system of the present invention. In the film antenna 10 according to the first and second examples of the second mode, the antenna conductor 23A adjacent to the power supply terminal 11 of the rectangular loop antenna formed on the sheet-like film 24 is connected to the power supply terminal 11. Is connected to the power supply terminal 12, and the antenna conductor 23 </ b> B disposed in the vicinity of the power supply terminal 12 is connected to the power supply terminal 11 while bypassing the power supply terminal 12. In the film antenna 10 according to the first and second embodiments of the second mode, the conventional connector 20 shown in FIGS. 2 and 3 may be used.

  In the antenna device according to the first and second examples of the second mode of the present invention, the connector 20 is connected to the power feeding terminals 11 and 12 of the film antenna 10 as shown in FIGS. When the coaxial cable 22 is wired along the antenna conductor of the antenna 10 as shown in FIG. 1 (c), the coaxial cable 22 is connected as shown in FIGS. 10 (a) and 10 (c). Since the current flowing through the ground wire 22B and the current flowing through the antenna conductor 23 close to the ground wire 22B of the coaxial cable 22 have the same phase, the radiation characteristics do not deteriorate and the reception performance of the antenna does not deteriorate.

(A) is the perspective view which looked at the windshield of the motor vehicle with which the conventional film antenna was attached from the vehicle interior side, (b) is the plane which expands and shows the loop antenna which is an example of the film antenna shown by (a) FIG. 4C is an enlarged view of a main part when the upper right portion of the windshield of the automobile is viewed from the vehicle interior side, to which the film antenna formed with the loop antenna shown in FIG. (A) is a perspective view showing the appearance of the connector and coaxial cable shown in FIGS. 1 (a) and (c), which are connected to the feeding terminal of the film antenna, and (b) is an exploded perspective view of the connector shown in (a). FIG. 2A is a diagram of the circuit board shown in FIG. 2B viewed from the back side, FIG. 2B is a block circuit diagram showing an internal configuration of an amplifier mounted on the circuit board shown in FIG. ) Is an explanatory view showing the connection between the connector shown in FIG. 2A and the film antenna shown in FIG. (A)-(c), when the connector is connected to the film antenna as shown in FIG. 3 (c), the antenna conductor with the feeding terminal of the loop antenna and the outer conductor of the coaxial cable connected to the connector It is explanatory drawing which shows the direction of the electric current which flows. (A) is a top view which shows the structure of the circuit board based on 1st Example of the 1st form of the antenna apparatus of this invention, and a receiving system, (b) is the connector shown to (a), and FIG. It is explanatory drawing which shows a connection with the film antenna shown to. (A)-(c), when the connector is connected to the film antenna as shown in FIG. 5 (b), the antenna conductor having the feeding terminal of the loop antenna and the outer conductor of the coaxial cable connected to the connector It is explanatory drawing which shows the direction of the electric current which flows. (A) is an assembly perspective view which shows the structure of the antenna apparatus which concerns on 2nd Example of the antenna apparatus of this invention, and the 1st form of a receiving system, (b) is a connection terminal of the connector shown to (a) It is explanatory drawing which shows the connection with a coaxial cable. (A) is the top view of the circuit board part which shows the structure of the antenna apparatus which concerns on 3rd Example of the antenna apparatus of this invention, and the 1st form of a receiving system, (b) is the connector of the connector shown to (a) It is a side view. (A), (b) is a top view which shows the structure of the film antenna which concerns on the 1st, 2nd Example of the 2nd form of the antenna apparatus of this invention, and a receiving system. (A)-(c) shows that when the connector is connected to the film antenna according to the first and second embodiments of the antenna device and the receiving system of the present invention, the feeding terminal of the loop antenna is It is explanatory drawing which shows the direction of the electric current which flows into a certain antenna conductor and the outer conductor of the coaxial cable connected to a connector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Windshield 10 Film antenna 11,12 Feeding terminal 20 Connector 21 Inner case 22 Coaxial cable 23 Antenna conductor 24 Sheet-like antenna 25 Outer case 30 Circuit board 31,32 Connection terminal 33,34 Through hole 40 Integrated circuit 50 Intermediate case

Claims (7)

A loop antenna having two feeding terminals;
A connector having two connection terminals connected to the two power supply terminals;
A coaxial cable connected to the connector and disposed along at least a portion of the loop antenna;
The connection terminal arranged on the side farther from the coaxial cable introduction part of the connector is connected to the outer conductor of the coaxial cable,
The antenna device according to claim 1, wherein a connection terminal disposed on a side closer to the coaxial cable introduction portion of the connector is connected to the coaxial cable inner conductor. A circuit board provided in the connector;
The circuit pattern provided on the circuit board, the connection terminal arranged on the side far from the introduction portion of the coaxial cable and the outer conductor of the coaxial cable, or the connection arranged on the side closer to the introduction portion of the coaxial cable The antenna device according to claim 1, wherein at least one of a terminal and an inner conductor of the coaxial cable is connected. Further comprising a conductor portion provided in the case of the connector, or an inner wall portion of the case,
The antenna device according to claim 1, wherein a connection terminal disposed on a side far from the introduction portion of the coaxial cable and an outer conductor of the coaxial cable are connected by the conductor portion.   The coaxial cable is folded back in the connector, and a connection terminal disposed on a side of the connector far from the introduction portion of the coaxial cable and an outer conductor of the coaxial cable are connected, and from the introduction portion of the coaxial cable of the connector The antenna device according to claim 1, wherein a connection terminal disposed on a near side is connected to an inner conductor of the coaxial cable. A loop antenna having first and second feed terminals;
A connector having two connection terminals connected to the two power supply terminals;
A coaxial cable connected to the connector and disposed along at least a portion of the loop antenna;
The first feeding terminal of the loop antenna is connected to an antenna conductor portion disposed in the vicinity of the second feeding terminal,
The antenna device, wherein the second feeding terminal of the loop antenna is connected to an antenna conductor portion arranged in the vicinity of the first feeding terminal. A loop antenna having two feeding terminals;
A connector having two connection terminals connected to the two power supply terminals;
A coaxial cable connected to the connector and disposed along at least a portion of the loop antenna;
Processing means connected to the coaxial cable and processing and outputting a signal received by the loop antenna;
The connection terminal arranged on the side farther from the coaxial cable introduction part of the connector is connected to the outer conductor of the coaxial cable,
A receiving system, wherein a connection terminal arranged on a side closer to the coaxial cable introduction portion of the connector is connected to the inner conductor of the coaxial cable. A loop antenna having first and second feed terminals;
A connector having two connection terminals connected to the two power supply terminals;
A coaxial cable connected to the connector and disposed along at least a portion of the loop antenna;
Processing means connected to the coaxial cable and processing and outputting a signal received by the loop antenna;
The first feeding terminal of the loop antenna is connected to an antenna conductor portion disposed in the vicinity of the second feeding terminal,
The second feeding terminal of the loop antenna is connected to an antenna conductor portion arranged in the vicinity of the first feeding terminal.

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