Radio communication system and wireless communication device
First Claim
1. A wireless communication system for data transmission by radio waves between a data supply source apparatus and a data provided destination apparatus, characterized in that:
- the data supply source apparatus has an RFID (Radio Frequency Identification) tag function that transmits data by a back scattering scheme by absorbing or reflecting external radio waves in accordance with a bit string of the data through an on/off control of an antenna switch to make an antenna in a terminated state or an open state; and
the data provided destination apparatus has a reader function that transmits radio waves in a predetermined frequency band and reads data of an RFID tag in accordance with reflected waves.
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Accused Products
Abstract
A low consumption power is realized in a communication type that a ratio of transmission between apparatus limited to a relatively short distance occupies most of communications. Upon reception of transmission data constituted of a bit series, a wireless transmission module unit performs an on/off operation of an antenna switch connected to an antenna, in accordance with a bit image of the transmission data, and transmits, by a back scattering scheme, the transmission data as reflected radio waves of radio waves from a transmission destination generated by a change in an antenna load impedance. The antenna switch is generally made of a gallium arsenide IC, its consumption power is several 10 μW or less, and it becomes possible to realize ultra low consumption wireless image transmission.
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Citations
10 Claims
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1. A wireless communication system for data transmission by radio waves between a data supply source apparatus and a data provided destination apparatus, characterized in that:
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the data supply source apparatus has an RFID (Radio Frequency Identification) tag function that transmits data by a back scattering scheme by absorbing or reflecting external radio waves in accordance with a bit string of the data through an on/off control of an antenna switch to make an antenna in a terminated state or an open state; and
the data provided destination apparatus has a reader function that transmits radio waves in a predetermined frequency band and reads data of an RFID tag in accordance with reflected waves. - View Dependent Claims (2, 3, 4, 5)
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6. A wireless communication apparatus for transmitting data, characterized by comprising:
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a signal processing unit for processing transmission data; and
a wireless transmission module including an antenna, an antenna switch and an antenna load, wherein data is transmitted by a back scattering scheme by absorbing or reflecting external radio waves in accordance with a bit string of the data through an on/off control of the antenna switch to make the antenna in a terminated state or an open state in accordance with a bit image of the transmission data. - View Dependent Claims (7, 8, 9, 10)
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Specification