JP2006025392A - Earphone cable antenna device, connection cable, and broadcast receiving apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earphone cable antenna device, a connection cable and a broadcast receiving apparatus for UHF bands, wherein provision of an earphone cable antenna that is resistant to affection by a human body being close to the antenna can achieve a stable antenna performance that is less dependent on the usage status. <P>SOLUTION: An insertion connector part 6 is inserted into an earphone connector part 8 connected to the circuitry within a lower case 2, whereby at least one of signal lines 4 is connected to a broadcast receiving circuit 9 via an audio signal line 10. The signal line 4 is also connected to a high frequency cutoff circuit 7 that is spaced by 3/4λ of operational frequency from the insertion connector part 6 to cut off the high frequency currents of UHF bands. The high frequency cutoff circuit 7 is further connected to an earphone 3 via the signal line 4. An earphone cable antenna element 5 is arranged in parallel with the signal line 4 and is equivalent to a L1=3/4λ length at the operational frequency. An antenna signal is inputted to the broadcast receiving circuit 9 via a matching circuit 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an earphone cable antenna device, a connection cable, and a broadcast receiving device.

  In general, it is known that an earphone cable is used as a wire antenna in a portable wireless device having a broadcast receiving function such as an FM radio or a TV broadcast receiver. In recent years, there has been a large demand for miniaturization and design of portable wireless devices, and in addition, it is equipped with an earphone cable antenna that is not conspicuous in terms of design in order to install a broadcast reception function in a mobile phone terminal that is required to be lightweight, compact, and portable. Is seen as promising.

  As an example of a receiver using an earphone cable antenna, as described in Patent Document 1, a circuit configuration is simplified so that an antenna earphone is a monaural configuration, an external antenna and an antenna earphone (earphone cable antenna), When both are connected together, it is known to prioritize reception with an external antenna.

  Moreover, there exists an antenna for portable radios which improved reception performance by accommodating a dipole antenna in an earphone cable outer tube as described in Patent Document 2. Patent Document 3 is also known in which a technique is disclosed in which an earphone cable has a reception antenna and a transmission antenna shorter than the reception antenna and one end of the antenna is connected to a three-terminal plug.

Thus, conventionally, a highly portable broadcast receiving antenna has been realized with a relatively simple configuration in which an earphone cable is coupled to an antenna circuit.
JP 7-307694 A Japanese Utility Model Publication No. 3-109414 JP 62-40804 A

  In the future, when terrestrial digital television 1-segment broadcasting is started, it is desired that this broadcasting can be used even in a mobile communication environment, and reception by a mobile phone terminal or the like is expected. For reception by a mobile phone terminal or the like, high portability and high sensitivity reception performance corresponding to a flexible usage method are required. Therefore, a high sensitivity antenna is required under actual use conditions. For example, the following two usage modes are assumed as usage methods that require high-sensitivity reception performance.

  One is a form in which a receiving terminal is put in a pocket or the like in a train or a crowded place to listen only to voice. Since one-segment broadcasting enables high-quality reception even for mobile terminals, it is assumed that content that can be enjoyed without video is provided. However, when the broadcast receiver is in use in the vicinity of the human body, there is a problem that the reception performance of the housing-mounted antenna is greatly deteriorated when the antenna is close to the human body.

  The second case is when the housing mounted antenna is covered with a hand when the portable terminal is held by hand. With the downsizing of broadcast receivers, it is possible to use a wide screen by inverting the housing, so that the state when using the antenna cannot be defined uniformly as in a mobile phone terminal. Furthermore, the cellular phone terminal has been built with a main antenna and the like, and since the position of the antenna cannot be seen from the outside, there is a high possibility that the antenna will be covered with a hand when holding both hands. Therefore, there is a problem that the antenna performance is greatly deteriorated by such a change in use state.

  However, the above-described conventional earphone cable antenna does not particularly assume the above two usage patterns, and there is a possibility that the antenna performance cannot be sufficiently exhibited in such usage patterns.

  The present invention has been made in view of the above points, and is provided with an earphone cable antenna that is not easily affected by the proximity of a human body, so that it is not affected by the usage pattern and can provide stable antenna performance. It is to provide a device, a connection cable and a broadcast receiving device.

  An earphone cable antenna device according to the present invention includes an earphone cable antenna element having a length of approximately three quarters of the operating frequency band, and is longer than the earphone cable antenna element and arranged in parallel with the earphone cable antenna element. A signal line and a high-frequency cutting circuit that cuts off a high-frequency current flowing through the signal line at a position that is separated from the connection end of the signal line on the side of the broadcast receiving apparatus by approximately three quarters of the operating frequency band. .

  According to this configuration, stable antenna performance can be obtained as an antenna for a broadcast receiver that is not easily affected by proximity to the human body.

  The earphone cable antenna device of the present invention employs a configuration in which the earphone cable antenna element includes a separation circuit that separates an electric signal and a high-frequency signal, and the earphone cable antenna element is shared with the signal line.

  The earphone cable antenna device according to the present invention adopts a configuration in which the earphone cable antenna element is shared as an outer conductor of the signal line.

  The earphone cable antenna apparatus of the present invention employs a configuration in which the high frequency cutting circuit is provided in a stereo type earphone cord division part.

  The earphone cable antenna device according to the present invention includes a housing-mounted antenna element, switching means for selecting the housing-mounted antenna element and the earphone cable antenna element, received signal quality in the housing-mounted antenna element, and the earphone cable. A configuration is provided that includes a control unit that controls the switching unit based on a comparison result with the received signal quality in the antenna element.

  The earphone cable antenna device of the present invention employs a configuration in which the high-frequency cutting circuit is built in a remote control unit.

  The earphone cable antenna device of the present invention employs a configuration including a balanced transmission line and an earphone cable antenna element connected to the balanced transmission line and having a length of a quarter wavelength or more of the operating frequency band.

  The earphone cable antenna device according to the present invention is longer than the earphone cable antenna element, and has a signal line arranged in parallel with the earphone cable antenna element, and an operating frequency band from the connection end of the signal line on the broadcast receiving device side. And a high-frequency cutting circuit that cuts a high-frequency current flowing through the signal line at a position separated by three-quarter wavelengths.

  According to these configurations, it is possible to realize a UHF band earphone cable antenna and a broadcast receiving apparatus that can obtain stable antenna performance that is hardly affected by the usage pattern.

  The broadcast receiving apparatus of the present invention employs a configuration including the above-described earphone cable antenna apparatus.

  The connection cable of the present invention includes a first connection means provided in a broadcast receiving device, a cable connected to the first connection means, a second connection means provided at the other end of the cable, An antenna element formed by a linear conductor, and a signal line arranged in parallel with the antenna element in the cable and formed by a linear conductor, and the cable is connected to the first connection means In this state, the antenna element operates as an external antenna of the broadcast receiving apparatus.

  According to this configuration, since the antenna element operates as an external antenna of the broadcast receiving apparatus in a state where the cable is connected to the first connection means, even when various external connection devices are connected to the second connection means. High antenna performance can be obtained. In addition, since there is an antenna element in the connection cable, the distance between the antenna element and the human body can be increased, deterioration of the antenna performance due to the influence of the human body can be reduced, and high antenna performance can be obtained.

  The connection cable of the present invention employs a configuration in which an inductance element is loaded in series with the signal line in the vicinity of the first connection means.

  According to this configuration, it is possible to reduce deterioration in antenna performance due to electromagnetic coupling between the antenna element and the signal line, and to obtain high antenna performance.

  The connection cable of the present invention employs a configuration in which an inductance element is loaded in series with the signal line in the vicinity of the second connection means.

  According to this configuration, it is possible to reduce deterioration in antenna performance due to electromagnetic coupling between the antenna element and the signal line, and to obtain high antenna performance.

  The connection cable of the present invention employs a configuration in which an inductance element is loaded in series with the signal line spaced a predetermined distance from the second connection means.

  According to this configuration, it is possible to reduce a decrease in radiation resistance due to the proximity of the antenna element and the signal line and electromagnetic coupling, and a wide frequency bandwidth can be secured, and the antenna element and the signal line can be secured. A reduction in radiation resistance due to electromagnetic coupling can be reduced, deterioration in antenna performance can be reduced, and high antenna performance can be obtained in a wide frequency bandwidth.

  The connection cable of this invention takes the structure provided with the external connection apparatus connected to a said 2nd connection means.

  According to this configuration, high antenna performance can be obtained even when various externally connected devices are connected to the second connection means. In addition, since there is an antenna element in the connection cable, the distance between the antenna element and the human body can be increased, deterioration of the antenna performance due to the influence of the human body can be reduced, and high antenna performance can be obtained.

  According to the present invention, stable high antenna performance can be obtained when a terrestrial digital television broadcast is being viewed using an earphone, particularly when the broadcast receiving apparatus is close to the human body, and the connection cable. It has an antenna element arranged inside, and high antenna performance can be obtained corresponding to various externally connected devices.

  Hereinafter, embodiments of an earphone cable antenna device, a connection cable, and a broadcast receiving device according to the present invention will be described with reference to the drawings, taking a simple demonstration experiment as an example. However, in the embodiment, configurations having the same functions are denoted by the same reference numerals, and redundant description is omitted.

(Embodiment 1)
FIG. 1 is a basic configuration diagram of a broadcast receiving apparatus according to Embodiment 1 of the present invention. An upper housing 1 and a lower housing 2 shown in FIG. 1 are portable receiving terminal bodies, and are assumed to be foldable mobile phone terminals. The earphone 3 is for a user to insert into his ear and listen to television sound via the signal line 4, and is used when listening to digital terrestrial broadcasting with high sound quality in a mobile environment.

  In the configuration example of FIG. 1, at least one signal line 4 passes through the audio signal line 10 by inserting the insertion connector part 6 into the earphone connector part 8 connected to the circuit inside the lower housing 2. To the broadcast receiving circuit 9.

  The signal line 4 may have a configuration of two audio signal lines and a ground line, or a plurality of signal lines 4 and two or more stereo audio signal lines and ground lines.

  Earphone cable antenna element 5 is arranged in parallel with signal line 4 and operates as an earphone cable antenna device equivalent to L1 = 3 / 4λ length at the operating frequency.

  The signal line 4 is connected to a high-frequency cutting circuit 7 for cutting a high-frequency current in the UHF band at a position separated from the insertion connector portion 6 by the same length as the earphone cable antenna element 5 (3 / 4λ of the operating frequency). Connect to the earphone 3 via the line 4. At this time, since a plurality of cables arranged in close proximity and parallel to each other carry a high-frequency current and collectively operate as an earphone cable antenna device, by loading the high-frequency cutting circuit 7 on the signal line 4, a specific length Only (L1) can be operated as the earphone cable antenna device.

  The UHF band high-frequency cutting circuit 7 may have an inductance of, for example, about 200 nH or more. However, if the high-frequency signal from the antenna can be cut by passing an electrical signal such as voice or a microphone, a fixed resistor, a ferrite-loaded conductor It may be a semiconductor, a diode, or the like.

  An audio signal line 10 output from the broadcast receiving circuit 9 is connected to the earphone connector unit 8, and an audio signal is transmitted to the earphone 3 via the signal line 4.

  The antenna signal received by the earphone cable antenna element 5 is a reception circuit that receives a television broadcast wave through a matching circuit 12 after grounding a low frequency portion by a coil 11 to remove audio noise. Connected to circuit 9.

  Hereinafter, based on the above basic configuration, the results of performance comparison based on the difference in the cable length of the earphone cable antenna device will be shown. Whereas the conventional type earphone cable antenna used the full length of the earphone cable (L1 + L2), the newly proposed earphone cable antenna uses only a part of it (a specific length that provides better performance) as an antenna. New characteristics due to the difference in length are used.

  Here, the antenna performance was evaluated by changing the total length (L1 + L2) of the earphone cable to 600 mm and changing the length (L1) of the earphone cable antenna element 5 to 144 mm, 405 mm, and 600 mm. This corresponds to a length of about ¼λ, about 3 / 4λ, and about 1λ at a frequency of 530 MHz in the terrestrial digital television frequency band of 470 MHz to 690 MHz.

  When L1 is 600 mm, L2 is set to 0 mm, and the high frequency cutting circuit 7 is not provided. Therefore, a comparative evaluation was performed as an example of a conventional type. For antenna performance comparison, the efficiency of the antenna in free space and the antenna gain when using the proximity of the human body shown in FIGS. 2 and 3 were evaluated.

  FIG. 2 shows a state in which measurement is performed assuming that the user 15 is watching a television broadcast on the mobile receiving terminal (when using 1). In FIG. 2, the signal line 4 and the earphone antenna cable element 5 are collectively shown as an entire earphone cable 14. Here, the measurement was performed with the distance d between the portable receiving terminal and the human body being 300 mm. Further, it is assumed that the user 15 inserts the earphone 3 into the ear, and the entire earphone cable 14 is hung in a natural state.

  FIG. 3 shows a state of measurement (when in use 2) assuming a state in which only the sound of a broadcast wave is being listened with the portable receiving terminal in a pocket or the like. Here, the measurement was performed by setting the distance d between the portable receiving terminal and the user 15 to 20 mm. Naturally, in this case, since the user 15 and the entire earphone cable 14 or the user 15 and the portable receiving terminal main body are close to each other, there is a concern that the antenna performance is deteriorated.

  4 shows the antenna performance at L1 = 144 mm, FIG. 5 shows the antenna performance at L1 = 405 mm, and FIG. 6 shows the antenna performance at L1 = 600 mm. The antenna performance is represented by a horizontal plane pattern averaging gain (PAG) [dBd] with a cross polarization ratio of 0, and measurements are performed at four frequencies within the terrestrial digital television frequency band (470 MHz to 690 MHz). ing. The state of FIG. 2 is shown as in-use 1 and the state of FIG.

  As shown in FIGS. 4, 5, and 6, all three types of antennas are substantially impedance matched so that mismatch loss is reduced in the entire operating frequency band, and free space efficiency is improved. (Η) is also stable.

  On the other hand, in the state where the television broadcast viewing (use 1) shown in FIG. 2 and the audio-only broadcast reception (use 2) shown in FIG. 3 are assumed, the antenna performance is large due to the length of the earphone cable antenna element 5. A difference appeared. In particular, it was found that by setting L1 = 3 / 4λ (405 mm) shown in FIG. 5, a high antenna gain can be obtained over the entire operating frequency band. In the case of FIG. 5, an antenna gain of −8 dBd or more can be stably obtained both in use 1 and in use 2, and depending on the use state as in FIGS. 4 and 6, the antenna gain can be reduced to about −15 dBd. Will not deteriorate.

  FIG. 7 is an image diagram of a high-frequency current flowing through the earphone cable antenna element 5. In general, when the operating length of the antenna element is 1 / 4λ (FIG. 7 (a)) or 3 / 4λ (FIG. 7 (b)), the current in the power feeding unit is maximized, so that the characteristics are wideband. It is known.

  However, when the operating length of the antenna element is ¼λ, a high-frequency current of almost the same amount as the high-frequency current flowing through the antenna element also flows into the mobile receiver terminal body, which is easily affected by the human body. There is. In FIG. 4, this is the reason why the characteristic deterioration is large when L1 = 1 / 4λ.

  Here, when the operating length of the antenna element is 3 / 4λ, as shown in FIG. 7B, most of the high-frequency current flows mainly to the antenna element, and the current flowing to the mobile receiving terminal main body is the total current amount. As few as 1/4. For this reason, while having broadband characteristics, the antenna performance is hardly deteriorated by holding the portable receiving terminal main body by hand, and there is little deterioration when close to the user's body.

  On the other hand, when the operating length of the antenna element is 1λ, almost all high-frequency current flows through the antenna element as shown in FIG. 7C, so that it may be less susceptible to the influence of the human body. An antenna element having an operation length of an integral multiple of 1 / 2λ has a narrow band due to a small feeding portion current and high impedance. For this reason, in FIG. 6, the impedance mismatch becomes large, and the gain when using the human body is deteriorated.

  From the above, by setting the length of the earphone cable antenna element 5 to about 3 / 4λ in the vicinity of the center frequency of the operating frequency band, it is effective as a high-gain and wide-band receiving antenna that is not easily affected by changes in usage patterns. It was shown that there is.

  In the case where the terrestrial digital television use frequency band (470 MHz to 690 MHz) is used as the operating frequency band, 3 / 4λ is 480 to 330 mm, which is a convenient length as an earphone cable.

  Moreover, even if it is a higher UHF frequency band of 800 MHz to 2 GHz, which is used in a mobile phone, 3 / 4λ is 110 to 280 mm, and it fits in the earphone cable, so it can be used as an external antenna for mobile phones. Is possible.

  In FIG. 1, only two signal lines 4 are shown. However, the signal lines 4 are constituted by a plurality of cables such as stereo sound, microphone signal lines, and remote control cables, and each is provided with a high frequency separation circuit 13. The same effect can be obtained.

  Also, there may be a plurality of earphone cable antenna elements 5 in FIG. 1, and by arranging the earphone cable antenna elements 5 having different lengths, an antenna that operates in a plurality of frequency bands can be realized.

(Embodiment 2)
FIG. 8 is a basic configuration diagram of a broadcast receiving apparatus according to Embodiment 2 of the present invention. In the second embodiment, the 3 / 4λ-long earphone cable antenna element 5 and the signal line 4 are separately arranged in the first embodiment, but the signal line 4 and the earphone cable antenna element 5 are shared. For this reason, it is not necessary to provide a separate element as the earphone cable antenna element 5.

  As in the first embodiment, by loading the high-frequency cutting circuit 7 in the middle of the signal line 4, the portable receiving terminal main body side of the signal line 4 operates as the earphone cable antenna element 5 corresponding to the length L1 = 3 / 4λ at the target frequency. To do.

  The audio signal line 10 output from the broadcast receiving circuit 9 is connected to the earphone connector unit 8, but a high frequency separation circuit 13 for blocking high frequency is loaded at the connection end of the earphone cable antenna element 5, Separate antenna signals.

  The separated antenna signal is connected to a broadcast receiving circuit 9 which is a receiving circuit for receiving a television broadcast wave through a matching circuit 12 after audio noise which is a low frequency part is removed by a grounded coil 11. . As a result, it is not necessary to provide a separate element exclusively for the earphone cable antenna, and a wide band and high sensitivity earphone cable antenna apparatus can be configured by reducing the number of cables.

  In FIG. 8, only two signal lines 4 are shown. However, the signal lines 4 may be composed of a plurality of cables such as stereo sound, microphone signal lines, and remote control cables, and each may be provided with a high frequency separation circuit 13. Similar effects can be obtained.

  FIG. 8 shows a configuration in which the audio signal line 4 is operated as an antenna, but the same effect can be obtained by a configuration in which a microphone signal line other than audio, a remote control cable, or the like is operated as an antenna.

(Embodiment 3)
FIG. 9 is a basic configuration diagram of a broadcast receiving apparatus according to Embodiment 3 of the present invention. The third embodiment is an application of the first embodiment, and uses a ground outer conductor 16 of the signal line 4 as the earphone cable antenna element 5.

  Since the ground outer conductor 16 of the signal line 4 is connected to the ground inside the casing of the portable receiving terminal main body, that is, the ground potential, in the low frequency band that is an audio signal band, the signal line 4 is shielded by the ground outer conductor 16. Is possible.

  The outer ground conductor 16 is formed of, for example, a net-like conductive wire that shields and covers the signal line 4. The high-frequency current that flows through the linear antenna flows mainly on the outer surface of the conductor. As a result, high-frequency isolation can be ensured between the high-frequency current flowing on the outer surface on the ground outer conductor 16 and the signal line 4 disposed inside the ground outer conductor 16. The high-frequency current can be reduced. Note that the audio signal supplied from the audio signal line 10 via the connector is connected to the high-frequency cutting circuit 7 through the signal line 4 and transmits the audio signal by the earphone 3.

  By adopting such a configuration, it is possible to listen to a high-quality audio signal with the earphone 3, and it is possible to realize an earphone cable antenna device that is broadband and highly sensitive.

  In the configuration of FIG. 9, the entire signal line 4 in the earphone cable is covered with the ground outer conductor 16, but the same effect can be obtained even when only a part of the plurality of signal lines 4 is covered.

(Embodiment 4)
FIG. 10 is a basic configuration diagram of a broadcast receiving apparatus according to Embodiment 4 of the present invention. The fourth embodiment is based on the first embodiment, and FIG. 10 shows a basic structure using a stereo type earphone cord as an earphone cable antenna apparatus.

  As shown in FIG. 10, by providing the high-frequency cutting circuit 7 at the branch point of the stereo audio cable, the high-frequency cutting circuit 7 can be mounted with a less conspicuous design. Further, as a similar structure, the present invention can also be applied to a microphone arrangement part or a remote control arrangement part of an earphone with an audio microphone used for a mobile phone or the like.

  It should be noted that this embodiment can be modified and applied to any of the second embodiment and the third embodiment.

(Embodiment 5)
FIG. 11 is a basic configuration diagram of a broadcast receiving apparatus according to Embodiment 5 of the present invention. The fifth embodiment is a broadcast receiving apparatus including a housing-mounted antenna 19 mounted on a housing outside the 3 / 4λ-long earphone cable antenna element 5, a matching circuit 18, a high-frequency switch 17, and a control unit 20. Here, as the housing-mounted antenna 19, for example, sharing with a mobile phone antenna or a small antenna dedicated for receiving television broadcasts can be considered.

  The high-frequency switch 17 is a high-frequency switching circuit composed of, for example, a PIN diode or FET, the output of which is input to the broadcast receiving circuit 9, and the matching circuit 18 is connected to the input side.

  The control unit 20 determines which antenna has the better quality among the received signals obtained by the broadcast receiving circuit 9 and controls the high-frequency switch 17 to always maintain high reception performance. As a criterion for selecting an antenna, there may be grounds such as selecting a higher received power or selecting a lower error rate after signal demodulation.

  By selecting a plurality of antenna elements with the high-frequency switch 17 in this way, it is possible to always obtain stable reception performance even in a mobile reception environment and various usage environments. Furthermore, it is possible to receive a television broadcast even when the earphone cable antenna element 5 is not connected. In addition, a high diversity effect can be obtained by adopting a loop antenna, a slot antenna, a plate-like inverted F antenna, a helical antenna, a rod antenna, or the like as a different antenna from the earphone cable antenna element. .

  Note that this embodiment can be modified in any of the second, third, and fourth embodiments.

(Embodiment 6)
FIG. 12 is a basic configuration diagram of a broadcast receiving apparatus according to Embodiment 6 of the present invention. In the sixth embodiment, a high-frequency cutting circuit 7 at the tip of the earphone cable antenna element 5 is built in the remote controller 30 near the middle of the earphone. As a result, the high-frequency cutting circuit 7 is not visible and the design is not affected. Further, the number of cables of the earphone cable antenna element 5 is increased by the remote controller 30, and the high frequency cutting circuit 7 is loaded on all of them.

  Note that this embodiment can be modified in any of the first to fifth embodiments.

(Embodiment 7)
FIG. 13 is a basic configuration diagram of a broadcast receiving apparatus according to Embodiment 7 of the present invention. In the seventh embodiment, an earphone cable that is connected from the earphone connector portion 8 to the middle of the earphone cable (L4) using a balanced transmission line 21 such as a Rehel line, for example, is a quarter λ or longer from one end thereof. The antenna element 5 (L3) is configured up to the earphone 3. The earphone cable antenna element 5 and the signal line 4 are arranged in parallel.

  FIG. 15A is an image diagram of a high-frequency current flowing through the earphone cable antenna element 5 according to the seventh embodiment. According to this, by using the balanced transmission line 21, power can be supplied at the midpoint of the earphone cable, and almost no current flows through the lower housing 2. In other words, the earphone cable antenna device is an unbalanced antenna, and the problem of being easily affected by the shape of the housing due to the flow of the housing current is improved. Further, since the antenna input to the broadcast receiving circuit 9 is usually a balanced line, a balanced / unbalanced converter is unnecessary, and conversion loss can be omitted.

(Embodiment 8)
FIG. 14 is a basic configuration diagram of a broadcast receiving apparatus according to Embodiment 8 of the present invention. The eighth embodiment is based on the seventh embodiment, and is provided with a high-frequency cutting circuit 7 at the tip of the earphone cable antenna element 5 (L3), and further through the signal line 4 (L2). 3 is connected.

  FIG. 15B is an image diagram of a high-frequency current flowing through the earphone cable antenna element 5 according to the eighth embodiment. According to this, it can be seen from the high-frequency cutting circuit 7 that only the midpoint of the earphone cable operates as an antenna. In other words, since the earphone 3 is inserted into the user's ear when in use and close to the human body, it is possible not to operate the distance L2 from the earphone 3 as an antenna, thereby reducing deterioration in performance during use of the antenna. .

  Note that this embodiment can be applied to any of Embodiments 4 and 6.

(Embodiment 9)
In Embodiment 9 of the present invention, a broadcast receiving apparatus is assumed to be a mobile phone (portable wireless apparatus), and the antenna thereof will be described as an example used for receiving a television broadcast (frequency is about 470 MHz to 700 MHz).

  FIG. 16 is a basic configuration diagram of a broadcast receiving device and a connection cable according to Embodiment 9 of the present invention. In this figure, a circuit board 127 is disposed inside the housing 101. The circuit board 127 includes a control unit 111 having a calculation function and a storage function, a wireless circuit unit 109 having a TV tuner unit (not shown), a matching circuit 12, and a connector 102 corresponding to the first connection means in the claims. Is mounted and mechanically fixed.

  The control unit 111 and a plurality of control terminals 103 provided inside the connector 102 are electrically connected via a plurality of signal lines 110, and audio information is transmitted to the earphone 3 corresponding to the externally connected device in the claims. A plurality of electrical signals for transmitting the signal are output from the control unit 111. Incidentally, the signal line 110 is configured by a printed pattern on the circuit board 127.

  The radio circuit unit 109 and the power supply terminal 104 of the connector 102 are electrically connected via the matching circuit 12.

  As described above, a plurality of control terminals 103 and power supply terminals 104 are arranged inside the connector 102, and a plurality of control terminals are connected by connecting the connector 102 and the connector 105 provided at one end of the connection cable 128. The terminal 103 and the plurality of signal lines 4 are electrically connected, and the feeding terminal 104 and the antenna element 106 are electrically connected.

  Here, the plurality of signal lines 4 and the antenna element 106 are each formed of a linear conductor, and the plurality of signal lines 4 and the antenna element 106 are covered with an insulating material so that they are not electrically connected to each other. After that, it is bundled as a connection cable 128.

  The length L4 of the antenna element 106 is about 40 cm. This length corresponds to about 0.6λ to about 1λ in the television broadcast band.

  A connector 118 corresponding to the second connection means in the claims is provided at the opposite end of the connection cable 128 where the connector 105 is provided.

  The connector 118 is connected to the earphone jack 113 of the earphone 3 to electrically connect the plurality of signal lines 4 and the earphone 3.

  In this way, the connector 102 and the connector 105 are connected, and the connector 118 and the earphone jack 113 are connected, whereby the control unit 111 and the earphone 3 are electrically connected, and the audio signal of the control unit 111 is transmitted to the earphone. 3 and the sound is output from the earphone 3.

  In the broadcast receiving apparatus configured as described above, the antenna element 106 having a length of about 40 cm operates as a monopole antenna on the ground pattern serving as the ground potential of the circuit board 127, and the matching circuit 12 is connected to the monopole antenna. The impedance is matched with the input impedance (generally 50Ω) of the radio circuit unit 109.

  In the broadcast receiving apparatus and the connection cable having the antenna as described above, the connection cable 128 is provided between the earphone 3 and the housing 101, unlike the case where the conventional earphone cable is directly used as the antenna. Since the electric length of the antenna element 106 is not changed even if the earphone 3 having various types and lengths of the earphone cable is used to feed power to the antenna element 106 provided in the antenna element 106, the antenna element 106 is always stable. And high antenna performance can be obtained.

  FIG. 17 is a diagram showing a state in which a television broadcast is viewed with the broadcast receiving apparatus shown in FIG. As shown in this figure, in the television viewing state, the antenna element 106 is unlikely to be close to the human body 125, so that a decrease in antenna performance due to the proximity of the human body can be reduced, and high antenna performance can be obtained.

  As described above, according to the present embodiment, unlike the conventional case where the signal line of the externally connected device is an antenna, it can be applied to various externally connected devices, and the antenna performance due to the proximity of the antenna and the human body is improved. Reduction can be reduced and high antenna performance can be obtained.

  In this embodiment, the case where the frequency band of television broadcasting is used has been described. However, the present invention is not limited to this, and FM broadcasting other than television broadcasting can be performed by changing the antenna element length. May be used.

  In this embodiment, the state in which the earphone jack 113 is connected to the connector 118 has been described. However, the present invention is not limited to this, and high antenna performance can be obtained even without the earphone jack 113 and the earphone 3. Can do.

  In the present embodiment, the earphone is used as the external connection device. However, the present invention is not limited to this, and may be, for example, an external display or a personal computer.

  In the present embodiment, the case 101 has been described as having a straight shape. However, the present invention is not limited to this, and for example, the folding shape described in the first embodiment may be used.

(Embodiment 10)
FIG. 18 is a basic configuration diagram of a broadcast receiving apparatus and connection cables according to Embodiment 10 of the present invention. 18 differs from FIG. 16 in that the inductance element 117 is loaded in series with each of the plurality of signal lines 110 and in the vicinity of the connector 102, and the inductance element 119 is connected to the plurality of signal lines inside the connector 118. It is a point to load each of 4 in series.

  The inductance element 117 is set so that its impedance is sufficiently high at a frequency used in television broadcasting and sufficiently low with respect to a direct current. According to the experiments by the authors, it is sufficient that the inductance value is 200 nH or more in the frequency band of television broadcasting of 470 MHz to 710 MHz. Further, it is desirable in terms of antenna performance that the inductance element 117 is disposed in the vicinity of the connector 102, for example, within 5 mm from the control terminal 103.

  Similar to the inductance element 117, the inductance element 119 is set such that the impedance is sufficiently high at a frequency used in television broadcasting and the impedance is sufficiently low with respect to a direct current. In addition, it is desirable in terms of antenna performance that the inductance element 119 is disposed within 5 mm from the end of the antenna element 106 on the connector 118 side.

  In the broadcast receiving apparatus configured as described above, the high-frequency current excited from the radio circuit unit 109 to the antenna element 106 is electromagnetically coupled by the proximity of the antenna element 106 and the signal line 4 in the cable 128. Leaks to the signal line 4. At this time, if the inductance element 117 is not disposed, the high-frequency current flows through the signal line 4 to the signal line 110 on the circuit board 127 and further flows to the ground pattern serving as the ground potential of the circuit board 127, thereby improving the antenna performance. Deteriorates. Further, if the inductance element 119 is not disposed, the high-frequency current flows through the earphone 3 connected to the signal line 4, and therefore the antenna performance is deteriorated.

  Therefore, in the case of the broadcast receiving apparatus and the connection cable of the present embodiment, the high-frequency current leaked to the signal line 4 by the inductance elements (117, 119) arranged on the signal line 4 in the vicinity of both ends of the antenna element 106. Can be cut off, and deterioration of antenna performance can be reduced. In addition, since the control unit 111 and the earphone 3 are electrically connected via inductance elements (117, 119) with a small loss of direct current, an electric signal can be transmitted to the earphone 3, and the earphone 3 is operated. Can be made.

  As described above, according to the present embodiment, the antenna element 106 and the signal line 4 are close to each other and are electromagnetically coupled, so that a reduction in radiation resistance can be reduced and a wide frequency bandwidth can be ensured. And high antenna performance can be obtained.

  In the present embodiment, the inductance element 117 is disposed on each line of the signal line 110 and the inductance element 119 is disposed on each line of the signal line 4 as a high-frequency current cutting method. However, the present invention is not limited to this. For example, the same effect can be obtained by increasing the impedance of a specific frequency band, such as an LC parallel resonance circuit, and decreasing the impedance of a direct current.

  In the present embodiment, the description has been given of the configuration in which the inductance element 117 and the inductance element 119 are arranged at the same time. However, the present invention is not limited to this, and only the inductance element 117 or only the inductance element 119 is arranged. Even in this case, higher antenna performance can be obtained compared to the conventional case.

  In this embodiment, the inductance element 117 is loaded on the signal line 110 on the circuit board 127. However, the present invention is not limited to this, and the inductance element 117 may be loaded on the signal line 110 inside the connector 102.

(Embodiment 11)
FIG. 19 is a basic configuration diagram of a broadcast receiving apparatus and connection cables according to Embodiment 11 of the present invention. FIG. 19 differs from FIG. 18 in that an inductance element 130 is disposed inside the connector 105 instead of the inductance element 117, and in series at a position separated from the connector 118 of the plurality of signal lines 4 by a predetermined distance L5. This is the point where the inductance element 131 is loaded.

  The inductance element 130 is disposed inside the connector 105 and is loaded on each of the plurality of signal lines 4. The inductance element 130 is set so that its impedance is sufficiently high at a frequency used in television broadcasting and sufficiently low with respect to a direct current.

  As described above, by disposing the inductance element 130 inside the connector 105, high antenna performance can be ensured similarly to the case where the inductance element is disposed on the circuit board 127, and the mounting area of the circuit board 127 can be secured. Can be enlarged.

  The inductance element 131 is loaded in series on the plurality of signal lines 4 located at a distance L5 from the connector 118. The inductance element 131 is set so that the impedance is sufficiently high at a frequency used in television broadcasting, as with the inductance element 130, and is sufficiently low with respect to a direct current.

  When the inductance elements (130, 119) are loaded in series on the plurality of signal lines 4 and the inductance element 131 is not loaded, the signal lines 4 near the antenna element 106 are also loaded. The antenna current is excited due to electromagnetic coupling. At this time, since the high-frequency current is cut off at the position of the inductance element 130 and the inductance element 119, the high-frequency lengths of the plurality of signal lines 4 in the portion sandwiched between the inductance element 130 and the inductance element 119 are as follows. It becomes almost the same as the element 106. Therefore, since the signal line 4 has a length that resonates in the television broadcast reception frequency band, a large amount of antenna current leaks to the signal line 4, and the antenna performance deteriorates at some frequencies in a wide frequency band. Accordingly, the inductance element 131 is loaded on the plurality of signal lines 4 at a distance L5 from the connector 118, and the high frequency lengths of the plurality of signal lines 4 are shortened, so that antennas to the plurality of signal lines 4 are provided. Reduce current leakage. Thereby, deterioration of the antenna performance at a specific frequency can be reduced, and high antenna performance can be obtained in a wide frequency band.

  According to the authors' experiment, it has been confirmed that the length of L5 is preferably 1 / 4λ to 1 / 2λ.

  As described above, according to the present embodiment, the mounting area of the circuit board 127 can be increased by arranging the inductance element 130 in the connector 105, and the antenna performance in a specific frequency band can be provided by providing the inductance element 131. Can be reduced, and high antenna performance can be obtained in a wide frequency band.

  In the present embodiment, the inductance element 130 and the inductance element 131 are arranged on the signal line 4 as a high-frequency current blocking method. However, the present invention is not limited to this, and a specific example such as an LC parallel resonance circuit is used. The same effect can be obtained by increasing the impedance in the frequency band and lowering the impedance for direct current.

  Although the present embodiment has been described as an antenna of a television broadcast reception frequency band, the present invention is not limited to this, and the constant of the inductance element can be set to an impedance in a desired frequency band as a transmission / reception antenna for a mobile phone. Is selected to be high and the electric length of the antenna element 106 is optimized, so that high antenna performance can be obtained.

  The earphone cable antenna device, the connection cable, and the broadcast receiving device according to the present invention can provide stable antenna performance when watching a television broadcast, particularly in the vicinity of a human body whose performance is severely deteriorated. Since a cable is used, restrictions on the design are small, and since there are few newly required parts, the cost load is small, so it is easy to put into practical use as a new antenna device.

Basic configuration diagram of broadcast receiving apparatus according to Embodiment 1 of the present invention The figure which shows the state which watches television broadcasting The figure which shows the state which hears only the sound of television broadcasting The figure which shows the antenna performance of the earphone cable antenna of 1 / 4λ Diagram showing antenna performance of a 3 / 4λ earphone cable antenna The figure which shows the antenna performance of the earphone cable antenna of 1λ Image diagram of high-frequency current on earphone cable antenna Basic configuration diagram of broadcast receiving apparatus according to Embodiment 2 of the present invention Basic configuration diagram of broadcast receiving apparatus according to Embodiment 3 of the present invention Basic configuration diagram of broadcast receiving apparatus according to Embodiment 4 of the present invention Basic configuration diagram of broadcast receiving apparatus according to embodiment 5 of the present invention Basic configuration diagram of broadcast receiving apparatus according to Embodiment 6 of the present invention Basic configuration diagram of broadcast receiving apparatus according to embodiment 7 of the present invention Basic configuration diagram of a broadcast receiving apparatus according to Embodiment 8 of the present invention Image diagram of high-frequency current on earphone cable antenna according to Embodiments 7 and 8 of the present invention Basic configuration diagram of broadcast receiver and connection cable according to Embodiment 9 of the present invention The figure which shows the state which views and listens to television broadcasting with the broadcast receiver shown in FIG. Basic configuration diagram of broadcast receiving apparatus and connection cable according to Embodiment 10 of the present invention Basic configuration diagram of broadcast receiving apparatus and connection cable according to Embodiment 11 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper housing | casing 2 Lower housing | casing 3 Earphone 4, 110 Signal line 5 Earphone cable antenna element 7 High frequency cutting circuit 9 Broadcast receiving circuit 10 Audio | voice signal line 12 Matching circuit (earphone cable antenna)
13 High Frequency Separation Circuit 14 Whole Earphone Cable 16 Ground Outer Conductor 17 High Frequency Switch 18 Matching Circuit (Case Mounted Antenna)
DESCRIPTION OF SYMBOLS 19 Housing-mounted antenna 20, 111 Control part 21 Balanced transmission line 101 Case 102, 105, 118 Connector 103 Control terminal 104 Feeding terminal 106 Antenna element 109 Wireless circuit part 113 Earphone jack 127 Circuit board 128 Connection cable 117, 119, 130, 131 Inductance element

Claims (14)

An earphone cable antenna element having a length of approximately three quarters of the operating frequency band;
A signal line that is longer than the earphone cable antenna element and arranged in parallel with the earphone cable antenna element;
A high-frequency cutting circuit that cuts off a high-frequency current flowing through the signal line at a position separated by about three-quarters of the operating frequency band from the connection end on the broadcast receiver side in the signal line;
An earphone cable antenna device comprising: The earphone cable antenna element has a separation circuit that separates an electric signal and a high-frequency signal,
The earphone cable antenna device according to claim 1, wherein the earphone cable antenna element is shared with the signal line.   The earphone cable antenna device according to claim 1, wherein the earphone cable antenna element is shared as a ground outer conductor of the signal line.   The earphone cable antenna device according to any one of claims 1 to 3, wherein the high-frequency cutting circuit is provided in a stereo type earphone cord division portion. A housing-mounted antenna element;
Switching means for selecting the housing-mounted antenna element and the earphone cable antenna element;
Based on a comparison result between the received signal quality in the housing-mounted antenna element and the received signal quality in the earphone cable antenna element, a control unit that controls the switching means;
The earphone cable antenna device according to any one of claims 1 to 4, further comprising:   The earphone cable antenna device according to claim 1, wherein the high-frequency cutting circuit is built in a remote control unit. A balanced transmission line;
An earphone cable antenna element connected to the balanced transmission line and having a length of a quarter wavelength or more of an operating frequency band;
An earphone cable antenna device comprising: A signal line that is longer than the earphone cable antenna element and arranged in parallel with the earphone cable antenna element;
A high-frequency cutting circuit that cuts off a high-frequency current flowing through the signal line at a position separated by about three-quarters of the operating frequency band from the connection end on the broadcast receiver side in the signal line;
The earphone cable antenna apparatus according to claim 7, further comprising:   A broadcast receiving apparatus comprising the earphone cable antenna apparatus according to claim 1. First connection means provided in the broadcast receiving device;
A cable connected to the first connecting means;
Second connection means provided at the other end of the cable;
An antenna element formed of a linear conductor in the cable;
A signal line arranged in parallel with the antenna element in the cable and formed of a linear conductor;
With
A connection cable, wherein the antenna element operates as an external antenna of a broadcast receiving apparatus in a state where the cable is connected to the first connection means.   The connection cable according to claim 10, wherein an inductance element is loaded in series with the signal line in the vicinity of the first connection means.   The connection cable according to claim 10 or 11, wherein an inductance element is loaded in series with the signal line in the vicinity of the second connection means.   The connection cable according to any one of claims 10 to 12, wherein an inductance element is loaded in series with the signal line spaced apart from the second connection means by a predetermined distance.   The connection cable according to claim 10, further comprising an external connection device connected to the second connection unit.

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