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In this letter, we consider a case in which only one radio frequency (RF) signal is of interest over multiple RF signals with contiguous spectrums (i.e., these RF signals are adjacent to each other). The minimum valid bandpass sampling range for a desired RF signal over multiple ones is derived under the assumption of contiguous spectrums. The sampling frequency confined by the derived minimum valid sampling range is significantly reduced compared to the case in which all the RF signals are desired. The minimum valid bandpass sampling frequency can be further reduced when the desired RF signal has symmetric double sidebands.