Filter is a key unit of adjacentfrequencychannel synthesizer and coupling problem is a key point in the design of a filter.
滤波器是邻频频道合成器的关键部件之一，而耦合问题又是滤波器设计的关键。
2
A frequency translation circuit (172-188) abuts the multiple channel bandpass filtered analogue signals in the frequency domain without any guard bands between adjacentchannel signals.