Transmission device, electric field communication transceiver, and electric field communication system
First Claim
1. A transmission device that induces an electric field based on data to be transmitted and transmits the data to be transmitted via the induced electric field, the transmission device comprising:
- a transmission means configured to transmit a modulated signal obtained by modulating the data to be transmitted with an alternating signal having a predetermined frequency,a transmission electrode configured to induce an electric field based on the modulated signal in the electric field transmission medium,a first reactance means provided between an output of the transmission means and the transmission electrode so as to cause resonance with each of parasitic capacitance produced between a ground of the transmission means and an earth ground, parasitic capacitance produced between the electric field transmission medium and the ground of the transmission means, and parasitic capacitance produced between the electric field transmission medium and the earth ground, anda second reactance means provided between the output of the transmission means and the ground of the transmission means or between the transmission electrode and the ground of the transmission means so as to cause resonance with each of the parasitic capacitances.
2 Assignments
0 Petitions
Accused Products
Abstract
There is provided a transmission means (3) configured to transmit a modulated signal obtained by modulating data, a transmission electrode (8) that induces an electric field based on the modulated signal in an electric field transmission medium (20), a first reactance means (2) that is provided between the electric field transmission medium (20) and an earth ground (14) and configured to cause resonance with parasitic capacitance produced between a ground (6) the transmission means (3) and the earth ground (14), parasitic capacitance produced between the electric field transmission medium (20) and the ground (6) of the transmission means (3) and parasitic capacitance produced between the electric field transmission medium (20) and the earth ground (14), and a second reactance means (1) provided between an output of the transmission means (3) and the ground (6) of the transmission means (3) or between the transmission electrode (8) and the ground (6) of the transmission means (3).
38 Citations
37 Claims
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1. A transmission device that induces an electric field based on data to be transmitted and transmits the data to be transmitted via the induced electric field, the transmission device comprising:
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a transmission means configured to transmit a modulated signal obtained by modulating the data to be transmitted with an alternating signal having a predetermined frequency, a transmission electrode configured to induce an electric field based on the modulated signal in the electric field transmission medium, a first reactance means provided between an output of the transmission means and the transmission electrode so as to cause resonance with each of parasitic capacitance produced between a ground of the transmission means and an earth ground, parasitic capacitance produced between the electric field transmission medium and the ground of the transmission means, and parasitic capacitance produced between the electric field transmission medium and the earth ground, and a second reactance means provided between the output of the transmission means and the ground of the transmission means or between the transmission electrode and the ground of the transmission means so as to cause resonance with each of the parasitic capacitances. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electric field communication transceiver that induces an electric field based on data to be transmitted in an electric field transmission medium to transmit the data to be transmitted via the induced electric field and receives data to be received via an electric field based on the data to be received that is induced in the electric field transmission medium, the transceiver comprising:
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a transmission means configured to transmit a modulated signal obtained by modulating the data to be transmitted with an alternating signal having a predetermined frequency, a transmission reception electrode configured to induce an electric field based on the modulated signal in the electric field transmission medium and receive electric field based on data to be received, a first reactance means provided between the output of an transmission means and the transmission reception electrode so as to cause resonance with each of parasitic capacitance produced between a ground of the transmission means and an earth ground, parasitic capacitance produced between the electric field transmission medium and the ground of the transmission means, and parasitic capacitance produced between the electric field transmission medium and the earth ground, a second reactance means provided between the output of the transmission means and the ground of the transmission means or between the transmission reception electrode and the ground of the transmission means so as to cause resonance with each of the parasitic capacitances, a reception means configured to detect an electric field based on the data to be received, to convert the electric field into an electric signal, and to demodulate the signal so as to receive the data, a first connection means configured to disconnect a signal path from the output of the transmission means through the transmission reception electrode so as to prevent leakage of a reception signal to the transmission means at the time of receiving and to connect the signal path from the output of the transmission means through the transmission reception electrode so as to output a transmission signal to the transmission reception electrode at the time of transmitting, and a second connection means configured to disconnect the second reactance means from the ground of the transmission means so as to prevent leakage of the reception signal to the ground of the transmission means at the time of receiving, and to connect the second reactance means with the ground of the transmission means so as to allow the second reactance means to cause resonance at the time of transmitting. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An electric field communication transceiver that carries out data communication via an electric field induced in an electric field transmission medium, the transceiver comprising:
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a resonance circuit that is provided with an inductor for causing resonance in a transmission signal for the communication and a variable capacitance diode of which electrostatic capacitance varies in accordance with a voltage applied thereto, and a resistor that generates a voltage in accordance with a direct current obtained by rectifying with the variable capacitance diode the transmission signal inputted to the resonance circuit and that is connected with the variable capacitance diode in parallel to apply the voltage across the anode and the cathode of the variable capacitance diode. - View Dependent Claims (19, 20, 21, 22)
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23. An electric field communication transceiver that induces an electric field based on data to be transmitted in a electric field transmission medium so as to carry out data transmission by using the induced electric field and carries out data reception by receiving an electric field based on data to be received that is induced in the electric field transmission medium, the transceiver comprising:
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a variable reactance means configured to vary a reactance value so that a voltage of the transmission applied to the electric field transmission medium so as to control resonance with parasitic capacitance between a ground of a transmission device relating to the transmission and an earth ground and parasitic capacitance between the electric field transmission medium and the earth ground, an inductor that composes a parallel resonance circuit in the variable reactance means in order to obtain resonance, and a plurality of variable capacitance means of which capacitance is variable and which are connected in parallel with the inductor and in series with one another so as to control the resonance in the parallel resonance circuit. - View Dependent Claims (24, 25, 26)
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27. An electric field communication transceiver that induces an electric field based on data to be transmitted in an electric field transmission medium to carry out data communication by use of the electric field and carries out data reception via an electric field based on data to be received that is induced in the electric field transmission medium,
an alternating signal output means configured to output an alternating signal having a first frequency, a transmission reception electrode configured to induce an electric field based on data to be transmitted so as to transmit the data, and to detect an electric field based on data to be received so as to receive the data, a first reactance means provided between an output of the alternating signal output means and the transmission reception electrode, the first reactance means causing resonance between parasitic capacitance between the transmission reception electrode and an earth ground and impedance that the electric field transmission medium close to the transmission reception electrode shares with the earth ground, a second reactance means provided between the output of the alternating signal output means and the earth ground or between the transmission reception electrode and the earth ground, the second reactance means causing resonance between parasitic capacitance between the transmission reception electrode and the earth ground and impedance that the electric field transmission medium close to the transmission reception electrode shares with the earth ground, a reception means configured to detect an electric field of an alternating signal having a second frequency different from the first frequency, a first filter means configured to allow passage of the alternating signal having the first frequency and to block the alternating signal having the second frequency, and a second filter means configured to allow passage of the alternating signal having the second frequency and to block the alternating signal having the first frequency.
Specification