Conventional dual up-conversion transmitter usually employs an intermediate frequency (IF) mixer and a radio frequency (RF) mixer to convert baseband user signal to IF and RF in sequence.

传统双上变频发射器通常采用中频(IF)混合器和射频(RF)混合器将基带用户信号依次转换成IF和RF。

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The distributed parameters of signal path of high frequency relay are the main factors that influence the radio frequency (rf) performances of relay.

高频继电器信号路径的分布参数是影响继电器射频(RF)性能的主要因素。

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With the rapid development of the communication technique and the growing demand of the markets, the better performance of radio-frequency (RF) wireless receivers is requested.

随着现代通信技术的飞速发展和市场需求的不断提高，对射频接收机的性能提出了更高要求。

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Its state-of-the-art radio frequency (RF) performance exceeds requirements established by EMVCo and the NFC Forum.

ENGADGET: Qualcomm announces cheap, battery efficient NFC chip, hopes to put it in phones next year

The concerns stem from the emissions of radio frequency (RF) radiation by both the handsets and the base stations that transmit and receive the signals.

BBC: Public Petitions Committee