JP6474098B2 - Common antenna for electric field communication and magnetic field communication, communication system, and communication method - Google Patents

Common antenna for electric field communication and magnetic field communication, communication system, and communication method Download PDF

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JP6474098B2
JP6474098B2 JP2015090079A JP2015090079A JP6474098B2 JP 6474098 B2 JP6474098 B2 JP 6474098B2 JP 2015090079 A JP2015090079 A JP 2015090079A JP 2015090079 A JP2015090079 A JP 2015090079A JP 6474098 B2 JP6474098 B2 JP 6474098B2
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field communication
magnetic field
electric field
driver
coil
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JP2016208388A (en
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近藤 利彦
利彦 近藤
森村 浩季
浩季 森村
昌宜 橋本
昌宜 橋本
仁 河野
仁 河野
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日本電信電話株式会社
国立大学法人大阪大学
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  The present invention relates to an electric field communication magnetic field communication shared antenna, a communication system, and a communication method.

  Research on human body communication is active as a communication method using an electric field. In electric field communication, an electric signal corresponding to transmission data is applied to an electrode of a transmission node, thereby inducing an electric field. The receiving node detects the change in the electric field. Here, each of the transmission node and the reception node includes a signal electrode for inducing and detecting an electric field and a GND electrode in a floating state. The network of electric field communication is a quasi-electrostatic field, and there is no signal propagation like electromagnetic waves. Therefore, the network transmission path model is considered to be a circuit in which a terminal, a human body, and a capacitance are approximately connected. At this time, in order for the signal applied from the transmission node to be reflected on the reception node side, a closed circuit that passes through both the transmission node and the reception node must be configured (FIG. 8).

  On the other hand, magnetic field communication using inductive coupling between coils as a signal channel has also been used in the near field (FIG. 9). The magnetic flux generated by the coil of the transmitter passes through the coil of the receiver, so that an induced electromotive force is generated in the coil on the receiver side. In this communication, since the Q value of the coil affects the communication quality, it is necessary to use a coil having a high Q value.

T. G. Zimmerman, "Personal Area Networks: Near-field intrabody communication" ISSCC 2010 / SESSION 24 / DRAM & FLASH MEMORIES / 24.3

  Here, when it is desired to use both the electric field communication and the magnetic field communication described above, the transmitting side and the receiving side need to have electrode pairs and coils for electric field communication. However, when considering miniaturization of the terminal, it is difficult to have both the electrode pair and the coil.

  This invention is made | formed in view of the said subject, and it aims at providing the electric field communication magnetic field communication shared antenna which can contribute to size reduction of a terminal, a communication system, and a communication method.

An antenna for electric field communication and magnetic field communication according to the present invention includes a first coil that forms a spiral on a plane, and a second coil that forms a spiral on a plane opposite to the plane formed by the first coil. An electric field communication driver is connected between one end of the first coil and one end of the second coil, and a magnetic field communication driver is connected between the one end of the first coil and the other end of the first coil. It is characterized by that.

  The communication system according to the present invention includes two antennas for electric field communication and magnetic field communication.

  In the communication method for magnetic field communication according to the present invention, a driver for magnetic field communication of one electric field communication magnetic field communication antenna transmits a signal, and the electric field communication driver of the electric field communication magnetic field communication antenna becomes high impedance, while the other The electric field communication driver and the magnetic field communication driver of the electric field communication magnetic field communication antenna have a high impedance, and the magnetic field communication driver detects a potential difference between both ends of the driver.

  In the communication method of electric field communication according to the present invention, the electric field communication driver of one electric field communication magnetic field communication antenna transmits a signal, the magnetic field communication driver of the electric field communication magnetic field communication antenna becomes high impedance, The electric field communication driver and the magnetic field communication driver of the common electric field communication magnetic field communication antenna have high impedance, and the electric field communication driver detects a potential difference between both ends of the driver.

  According to the present invention, magnetic field communication and electric field communication can be performed without both an electrode pair and a coil, and therefore, it is possible to contribute to miniaturization of a terminal that communicates using an electric field communication magnetic field communication shared antenna.

It is a circuit diagram which shows the electric field communication magnetic field communication shared antenna which concerns on this Embodiment. It is a figure which shows an example of a structure and arrangement | positioning of two electric field communication magnetic field communication shared antennas at the time of communication. It is a figure which shows a mode that magnetic field communication is performed by two electric field communication magnetic field communication shared antennas. It is a figure which shows a mode that electric field communication is performed by two electric field communication magnetic field communication shared antennas. It is a figure which shows the result of having compared the transmission coefficient S21 at the time of magnetic field communication with the antenna for electric field communication magnetic field communication of this Embodiment, and the antenna of a comparative example. It is a figure which shows the result of having compared the transmission coefficient S21 at the time of electric field communication with the electric field communication magnetic field communication shared antenna of this Embodiment, and the electrode of a comparative example. It is a figure which shows the structure and arrangement | positioning of the flat electrode which is a comparative example of electric field communication. It is a figure which shows the mode of the conventional electric field communication. It is a figure which shows the mode of the conventional magnetic field communication.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a circuit diagram showing an electric field communication magnetic field communication shared antenna according to the present embodiment.

  The electric field communication magnetic field communication shared antenna includes a spiral first coil 1 and a second coil 2 that face each other, and is used for electric field communication between one end 1a of the first coil 1 and one end 2a of the second coil 2. A driver 3 is connected, and a magnetic field communication driver 4 is connected between one end 1 a of the first coil 1 and the other end 1 b of the first coil 1.

  For example, a capacitor 5 is formed between one end 1a and the other end 1b of the first coil 1. For example, a capacitor 6 is formed between one end 2 a and the other end 2 b of the second coil 2. For example, a capacitor 7 is formed between the one end 1 a of the first coil 1 and the driver 4. The

  FIG. 2 is a diagram showing an example of the structure and arrangement of two antennas for electric field communication and magnetic field communication at the time of communication.

  For example, each of the first coil 1 and the second coil 2 has a diameter of 2 mm. The distance between the first coil 1 and the second coil 2 of the same electric field communication magnetic field communication antenna is, for example, 1 mm.

  In a communication system using two electric field communication magnetic field communication antennas, first coil 1 and second coil 2 of one electric field communication magnetic field communication antenna and first coil 1 and second coil of the other electric field communication magnetic field communication antenna. 2 are preferably parallel to each other. With such an arrangement, the transmission coefficient can be increased as compared with the case where the two are not parallel.

  FIG. 3 is a diagram illustrating a state in which magnetic field communication is performed using two antennas for electric field communication and magnetic field communication.

  On the left transmission side, the driver 3 becomes high impedance (Hi-Z). On the right receiving side, the drivers 3 and 4 become high impedance (Hi-Z).

  On the transmission side, the driver 4 generates a signal, and the first coil 1 generates a magnetic field by the signal.

  On the receiving side, an induced electromotive force is generated in the first coil 1 by the magnetic field penetrating the first coil 1. Due to the induced electromotive force, a potential difference V is generated between both ends of the driver 4. The driver 4 detects the potential difference V. Communication is thus performed.

Thus, when the electric field communication driver transmits a signal, the magnetic field communication driver has a high impedance, and when the magnetic field communication driver transmits a signal, the electric field communication driver has a high impedance. will, if the driver of the electric-field communication receives a signal, the driver and the driver of the magnetic field communication for electric field communication becomes high impedance, when the driver for a magnetic field communication is received a signal, for electric field communication The driver and the driver for magnetic field communication become high impedance.

  If such impedance control is not performed, a circuit configuration that adds a resistor when necessary using a switch or the like is necessary, and the Q value of the first coil 1 may decrease.

  However, in practice, the Q value can be prevented from decreasing by adjusting the impedance as described above. In addition, the second coil 2 of each electric field communication magnetic field communication antenna has an effect of improving communication quality without interfering with magnetic field communication. This will be described later.

  FIG. 4 is a diagram illustrating a state in which electric field communication is performed by using two antennas for common electric field communication and magnetic field communication.

  On the left transmission side, the driver 4 becomes high impedance (Hi-Z). On the right receiving side, the drivers 3 and 4 become high impedance (Hi-Z).

  Since the first coil 1 and the second coil 2 on the transmission side and the reception side are spiral, they have mutual capacitance. That is, each coil functions as an electrode.

  On the transmission side, the driver 3 generates a signal, and charges are injected into the first coil 1 and the second coil 2 on the transmission side and the reception side, respectively, by the signal. Thereby, each coil is capacitively coupled.

  On the receiving side, the first coil 1 and the second coil 2 are capacitively coupled to generate a potential difference V across the driver 3. The driver 3 detects the potential difference V. Communication is thus performed.

  In such electric field communication, since the frequency of the signal is set to be different from the resonance frequency of the first coil 1 and the second coil 2, it is possible to prevent the influence on the magnetic field communication.

  FIG. 5 is a diagram illustrating a result of comparing the transmission coefficient S21 during magnetic field communication between the electric field communication magnetic field communication shared antenna of the present embodiment and the antenna of the comparative example.

  As the electric field communication magnetic field communication shared antenna of the present embodiment, the antenna having the structure shown in FIG. 2 is used, and the arrangement shown in FIG. 2 is adopted. The values of the capacitors 5, 6, and 7 were set so that the first coil 1 and the second coil 2 resonate at 340 MHz, for example.

  As the antenna of the comparative example, an antenna obtained by removing the second coil 2, the driver 3, and the capacitor 6 from the electric field communication magnetic field communication common antenna of the present embodiment was used, and the first coils 1 were arranged to face each other. Further, the distance between the first coils 1 was made equal to the distance between the first coils 1 in FIG.

  Reference numeral 51 indicates the transmission coefficient S21 of the electric field communication magnetic field communication antenna according to the present embodiment, and reference numeral 52 indicates the transmission coefficient S21 of the antenna of the comparative example.

  The vertical axis of the graph is the transmission coefficient S21, and the horizontal axis is the distance between the second coil 2 of one electric field communication magnetic field communication common antenna and the first coil 1 of the other electric field communication magnetic field communication common antenna in FIG. Each transmission coefficient S21 decreases as the distance increases.

  As shown in FIG. 5, the transmission coefficient S21 of the electric field communication magnetic field communication shared antenna of the present embodiment does not deteriorate from the transmission coefficient S21 of the antenna of the comparative example, but rather is improved. Therefore, magnetic field communication can be performed similarly to the antenna of the comparative example.

  FIG. 6 is a diagram showing a result of comparing the transmission coefficient S21 during electric field communication between the electric field communication magnetic field communication shared antenna of the present embodiment and the electrode of the comparative example.

  As the electric field communication magnetic field communication shared antenna of the present embodiment, the antenna having the structure shown in FIG. 2 is used, and the arrangement shown in FIG. 2 is adopted.

  As the electrode of the comparative example, the flat plate electrode shown in FIG. 7 was used. The transmission-side GND electrode 1A and signal electrode 2A, and the reception-side GND electrode 1A and signal electrode 2A are arranged in parallel. The distance between the GND electrode 1A and the signal electrode 2A of the same flat plate electrode was made equal to the distance between the first coil 1 and the second coil 2 of the same electric field communication magnetic field communication antenna.

  In addition, the distance between the GND electrode 1A on the transmission side and the signal electrode 2A on the reception side is such that the first coil 1 of one electric field communication magnetic field communication antenna and the second coil 2 of the other electric field communication magnetic field communication antenna in FIG. Equal to the distance.

  In FIG. 6, the code | symbol 61 shows the transmission coefficient S21 of the electric field communication magnetic field communication shared antenna of this Embodiment, and the code | symbol 62 shows the transmission coefficient S21 of the antenna of a comparative example.

  The vertical axis of the graph is the transmission coefficient S21, and the horizontal axis is the signal frequency. Each transmission coefficient S21 increases as the frequency increases.

  The transmission coefficient S21 of the electric field communication magnetic field communication antenna of the present embodiment is about 1 dB lower than the transmission coefficient S21 of the electrode of the comparative example, but can be regarded as substantially the same. Therefore, electric field communication can be performed similarly to the electrode of the comparative example.

As described above, according to the electric field communication field communication shared antenna of the embodiment, first to form a spiral and a first coil forming a spiral on a plane, on a plane facing the plane formed by the first coil 2 coils, a driver for electric field communication is connected between one end of the first coil and one end of the second coil, and for magnetic field communication between one end of the first coil and the other end of the first coil The driver is connected. Accordingly, magnetic field communication and electric field communication can be performed without both the electrode pair and the coil, and it is possible to contribute to miniaturization of a terminal that performs communication using the electric field communication magnetic field communication shared antenna.

In addition, when the driver for electric field communication transmits a signal, the driver for magnetic field communication becomes high impedance, and when the driver for magnetic field communication transmits a signal, the driver for electric field communication becomes high impedance, If the driver and the driver of the magnetic field communication for electric field communication becomes high impedance, when the driver for a magnetic field communication is received a signal, a driver for the electric field communication driver for electric field communication receives a signal Since the driver for magnetic field communication has high impedance, a circuit configuration for adding a resistor when necessary using a switch or the like is unnecessary, and it is possible to contribute to miniaturization of a terminal that communicates with an antenna for electric field communication and magnetic field communication.

1 First coil 2 Second coil 3 4 Driver 5 6 7 Capacitor

Claims (7)

  1. A first coil that forms a spiral on a plane, and a second coil that forms a spiral on a plane opposite to the plane formed by the first coil,
    A driver for electric field communication is connected between one end of the first coil and one end of the second coil,
    An electric field communication magnetic field communication antenna, wherein a driver for magnetic field communication is connected between one end of the first coil and the other end of the first coil.
  2. When the electric field communication driver transmits a signal, the magnetic field communication driver becomes high impedance,
    When the driver for magnetic field communication transmits a signal, the driver for electric field communication becomes high impedance,
    When the electric field communication driver receives a signal, the electric field communication driver and the magnetic field communication driver are in high impedance,
    Wherein the magnetic field if the driver for communication is received a signal, according to claim 1 field communication field communication shared antenna according to the driver for the magnetic field communication with the driver for the electric field communication is characterized in that a high impedance.
  3.   A communication system comprising two antennas for electric field communication and magnetic field communication according to claim 1 or 2.
  4. A communication system according to claim 3,
    The first coil and the second coil of one electric field communication magnetic field communication antenna, and the first coil and the second coil of the other electric field communication magnetic field communication antenna are parallel to each other.
  5. A communication method in a communication system including two electric field communication magnetic field communication shared antennas according to claim 1,
    The driver for magnetic field communication of one electric field communication magnetic field communication antenna transmits a signal, and the electric field communication driver for the electric field communication magnetic field communication antenna becomes high impedance,
    A communication method, wherein the electric field communication driver and the magnetic field communication driver of the other electric field communication magnetic field communication antenna have high impedance, and the magnetic field communication driver detects a potential difference between both ends of the driver.
  6. A communication method in a communication system including two electric field communication magnetic field communication shared antennas according to claim 1,
    The electric field communication driver of one electric field communication magnetic field communication antenna transmits a signal, and the magnetic field communication driver of the electric field communication magnetic field communication antenna becomes high impedance,
    A communication method, wherein the electric field communication driver and the magnetic field communication driver of the other electric field communication magnetic field communication antenna have high impedance, and the electric field communication driver detects a potential difference between both ends of the driver.
  7. The communication method according to claim 5 or 6, wherein
    The first coil and the second coil of one electric field communication magnetic field communication antenna, and the first coil and the second coil of the other electric field communication magnetic field communication antenna are parallel to each other.
JP2015090079A 2015-04-27 2015-04-27 Common antenna for electric field communication and magnetic field communication, communication system, and communication method Active JP6474098B2 (en)

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