| 摘要 |
An Active Radio Frequency Identification (RFID) transponder is used in conjunction with a customer relationship system to provide a variety of customer relationship management services within a retail establishment. The transponder includes a battery-powered integrated circuit and low-frequency antenna that detect a low-frequency activation signal from an activator when a customer enters a retail establishment. The transponder also includes a high frequency antenna and oscillating crystal for transmitting an identifier signal when activated. The battery, integrated circuit, high-frequency antenna, low-frequency antenna, and crystal are embodied in a card assembly substantially conforming to a form factor of a credit card or smaller that can be carried in, for example, a wallet, purse, or pocket of a customer.
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