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问题的提出这几年来,多数移动电话中都使用了无线调频(FM)信号接收组件。由于波长长(λ~3m),占调频频带较大(带宽是FM调频频带76~108MHz的
Questions raised Over the years, most cellular phones have used radio frequency (FM) signal receiving components. Due to the long wavelength (λ ~ 3m), accounting for a larger frequency band (bandwidth FM FM band 76 ~ 108MHz