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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0117258 (1993-09-03) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 352 인용 특허 : 0 |
A Radio Frequency Identification (RFID) system having an interrogator (12) and a transponder (14). The interrogator has a first tuned circuit (28) of a powering frequency for sending a powering burst to a transponder (14), a filter/demodulator (64) for receiving an wireless, modulated RF response fr
A Radio Frequency Identification (RFID) system having an interrogator (12) and a transponder (14). The interrogator has a first tuned circuit (28) of a powering frequency for sending a powering burst to a transponder (14), a filter/demodulator (64) for receiving an wireless, modulated RF response from a transponder (14). The interrogator (12) further has a second tuned circuit (29) in electrical communication with a modulator (48), the second tuned circuit (29) having a selected bandwidth about a communication frequency, the selected bandwidth not substantially overlapping the powering frequency and encompassing the bandwidth of the modulated carrier of the RF response. The interrogator also has a controller (16) in electrical communication with the filter/demodulator (64) and the tuned circuits (28,29) and capable of enabling the first tuned circuit (28) to send the powering burst during a first time period and of enabling the modulator (48) in electrical communication with the second tuned circuit (29) to receive the RF response during a second time period. The transponder has a tuned circuit (34), a tuning circuit (54,56) in electrical communication with the tuned circuit (34) for modifying the frequency characteristics of the tuned circuit (34) such that it is can be tuned during the powering burst to the powering frequency and to be tuned during the RF response to the communication frequency. The transponder (14) also includes a demodulator (66) in electrical communication with the tuned circuit (34) for receiving the RF interrogation therefrom and for demodulating data from the RF interrogation.
A Radio Frequency Identification (RFID) system, said system comprising: a) an interrogator, said interrogator having i) a carrier wave generator for generating a powering burst of a powering frequency, ii) a demodulator for demodulating response data from an RF response from a transponder, said RF r
A Radio Frequency Identification (RFID) system, said system comprising: a) an interrogator, said interrogator having i) a carrier wave generator for generating a powering burst of a powering frequency, ii) a demodulator for demodulating response data from an RF response from a transponder, said RF response being a wireless, modulated carrier signal, iii) a tuned circuit in electrical communication with said demodulator, said tuned circuit having a selected bandwidth about a communication frequency, said selected bandwidth not substantially overlapping said powering frequency and encompassing the bandwidth of the modulated carrier of said RF response, iv) a controller in electrical communication with said tuned circuit and said demodulator, said controller operable to enable said carrier wave generator to send said powering burst during a first time period and to enable said demodulator in electrical communication with said tuned circuit to receive said RF response during a second time period; and b) a transponder, said transponder having i) a tuned circuit operable to oscillate with a carrier having a frequency equal to the resonance frequency of said tuned circuit, ii) a tuning circuit in electrical communication with said tuned circuit for modifying the frequency characteristics of said tuned circuit such that the tuned circuit is operable to be tuned during said powering burst to said powering frequency and to be tuned during said RF response to said communication frequency, said powering signal causing the tuning circuit to oscillate with a carrier having said powering frequency, and iii) a modulator in electrical communication with said tuned circuit for modulating the carrier therein with RF response data to form said RF response.
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