Patent ID: 8643473
Filing Date: 2014-02-04
Classification: G06K,H01Q

Abstract:
1. A signal processing apparatus configured to be arranged near a reader writer and to enable non-contact communication between the reader writer and a non-contact IC card, comprising: a first antenna to perform the non-contact communication with the reader writer; a second antenna installed adjacent to the first antenna to perform the non-contact communication with the non-contact IC card; a metal body that is arranged between the first antenna and the second antenna and blocks a magnetic field between the first antenna and the second antenna; a first magnetic body arranged between the first antenna and the metal body, and a second magnetic body arranged between the second antenna and the metal body; an amplification unit that amplifies a carrier wave; a modulation unit that modulates the carrier wave, and a load modulation unit that changes an impedance of the first antenna, wherein the signal processing apparatus receives a first carrier wave modulated with first data transmitted to the non-contact IC card from the reader writer by using the first antenna, generates a second carrier wave by amplifying the first carrier wave by the amplification unit, modulates the second carrier wave with the first data by the modulation unit, transmits the second carrier wave modulated with the first data to the non-contact IC card by using the second antenna, receives second data returned by load modulation of an antenna of the non-contact IC card from the non-contact IC card by using the second antenna, and transmits the second data to the reader writer by performing the load modulation that changes the impedance of the first antenna by the load modulation unit based on the second data, and in which each of the first antenna and the second antenna is configured as a loop antenna and arranged such that a communication or loop surface of the first antenna is parallel to a communication or loop surface of the second antenna, and in which when the signal processing apparatus is arranged near the reader writer, each of the loop surface of the first antenna and the loop surface of the second antenna is parallel to a communication surface of the reader writer, said signal processing apparatus further comprising a power generating circuit to generate power for use therein by mixing internal power obtained from a magnetic field from the reader writer and external power obtained from an external power supply in a predetermined ratio, in which the predetermined ratio of internal power to external power is within a ratio range of 1:3 to 1:20.