| 摘要 |
A modem connected to a communication terminal to process communication signals, includes a central processing unit (CPU) for modulating/demodulating signals, a primary antenna connected to the CPU for receiving/sending signals, an interface connected to the CPU and a data cable connecting the communication terminal to the interface. The impedances of the data cable and the primary antenna match each other, such that the data cable resonates with the primary antenna and functions as a secondary antenna when the primary antenna works.
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