他们指出，任何有头脑的外星文明都不会发射电磁波谱中的光子——无论是可见光波段还是射频波段——向另一个太阳系传送信息。
They suggest that any alien civilisation worth its salt would alight not on the photons of the electromagnetic spectrum-whether optical or radio-frequency-to send messages to other solar systems.
介绍了一种米波段直接射频采样数字接收机，并通过一个数字接收机的实例说明它的具体设计和实现方式。
Metre wave band direct RF sampling digital receiver is introduced in this paper. Main design and implement method is explained by an example of digital receiver.
介绍了一种应用于C波段接收机射频前端，并利用耦合微带线设计的射频滤波器。
An RF fitter, which is applied to C-band receiver RF front and designed with the coupling micros - trip line, is introduced.
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