Communication system, communication apparatus, and electric-field-coupling antenna
First Claim
1. A communication system, comprising:
- a transmitter including a transmission circuit unit configured to generate a radio-frequency signal for transmitting data and an electric-field-coupling antenna configured to transmit the radio-frequency signal as an electrostatic field or an induced electric field;
a receiver including an electric-field-coupling antenna and a reception circuit unit configured to receive and process the radio-frequency signal received by the electric-field-coupling antenna; and
an impedance matching unit configured to make an impedance of the electric-field-coupling antenna of the transmitter equal to an impedance of the electric-field-coupling antenna of the receiver,wherein;
the radio-frequency signal is transmitted by electric-field coupling between the electric-field-coupling antennas, facing each other, of the transmitter and the receiver; and
the radio-frequency signal is transmitted by a longitudinal wave component of the electrostatic field or the induced electric field.
1 Assignment
0 Petitions
Accused Products
Abstract
A communication system includes the following elements: a transmitter including a transmission circuit unit configured to generate an RF signal for transmitting data and an EFC antenna configured to transmit the RF signal as an electrostatic field or an induced electric field; a receiver including an EFC antenna and a reception circuit unit configured to receive and process the RF signal received by the EFC antenna; and an impedance snatching unit configured to make an impedance of the EFC antenna of the transmitter equal to an impedance of the EFC antenna of the receiver. The RF signal is transmitted by electric-field coupling between the EFC antennas, facing each other, of the transmitter and the receiver.
19 Citations
25 Claims
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1. A communication system, comprising:
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a transmitter including a transmission circuit unit configured to generate a radio-frequency signal for transmitting data and an electric-field-coupling antenna configured to transmit the radio-frequency signal as an electrostatic field or an induced electric field; a receiver including an electric-field-coupling antenna and a reception circuit unit configured to receive and process the radio-frequency signal received by the electric-field-coupling antenna; and an impedance matching unit configured to make an impedance of the electric-field-coupling antenna of the transmitter equal to an impedance of the electric-field-coupling antenna of the receiver, wherein; the radio-frequency signal is transmitted by electric-field coupling between the electric-field-coupling antennas, facing each other, of the transmitter and the receiver; and the radio-frequency signal is transmitted by a longitudinal wave component of the electrostatic field or the induced electric field. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication apparatus, comprising:
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a communication circuit unit configured to process a radio-frequency signal for transmitting data; and an electric-field-coupling antenna configured to establish electric-field coupling to a communication partner facing the communication apparatus, wherein; the electric-field-coupling antenna has an impedance matched to that of the communication partner with which electric-field coupling is established; and the radio-frequency signal is transmitted by a longitudinal wave component of an electric field. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An electric-field-coupling antenna used in communicating a radio-frequency signal using electric-field coupling, comprising:
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an electrode; a series inductor; and a parallel inductor, wherein; the electrode, the series inductor, and the parallel inductor are connected to a radio-frequency-signal transmission line; the electric-field-coupling antenna has an impedance matched to that of a communication partner with which electric-field coupling is established; and the radio-frequency signal is transmitted by a longitudinal wave component of an electric field. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A communication apparatus, comprising:
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a communication circuit unit configured to process a radio-frequency signal for transmitting data; and an electric-field-coupling antenna configured to establish electric-field coupling to a communication partner facing the communication apparatus, wherein; the electric-field-coupling antenna has an impedance matched to that of the communication partner with which electric-field coupling is established; the electric-field-coupling antenna includes an electrode, a series inductor, and a parallel inductor, all of which are connected to a radio-frequency-signal transmission line; the electrode included in the electric-field-coupling antenna is mounted at a predetermined height above a printed circuit board on which the communication circuit unit is mounted; and the predetermined height is a distance for suppressing electric-field coupling to ground on the printed circuit board, a distance for forming the series inductor for achieving impedance matching, and a distance for reducing emission of unnecessary radio waves due to current flow in the series inductor.
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25. An electric-field-coupling antenna used in communicating a radio-frequency signal using electric-field coupling, comprising:
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an electrode; a series inductor; and a parallel inductor, wherein; the electrode, the series inductor, and the parallel inductor are connected to a radio-frequency-signal transmission line, and; the electric-field-coupling antenna has an impedance matched to that of a communication partner with which electric-field coupling is established; the electrode is mounted at a predetermined height above a printed circuit board; and the predetermined height is a distance for suppressing electric-field coupling to ground on the printed circuit board, a distance for forming the series inductor for achieving impedance matching, and a distance for reducing emission of unnecessary radio waves due to current flow in the series inductor.
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Specification