| 摘要 |
It is possible to improve the degree of freedom in the communication using a quasi-electrostatic field. A communication system (1) includes a card device (3) (ticket gate 2) generating from an internal electrode (8) (side electrode 7), a quasi- electrostatic field according to an identification signal S5 (communication signal S9) modulated according to identification information S4 (communication information S8), thereby charging a human body. The ticket gate (2) (card device 3) detects a displacement of intensity of the information transmission quasi-electrostatic field DTD formed isotropically in the vicinity of the human body, via the side electrode (7) (internal electrode 8) and FET (28) (FET 37) and demodulates the identification information S4 (communication information S8) according to the detection result. Thus, it is possible to realize information transmission/reception without posing direction constraint in the vicinity of a human body or requiring a predetermined action of a human body and while assuring secrecy. This significantly increases the degree of freedom in communication.
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