After getting the result in time domain, the frequencyofoscillation is obtained by FFT.
得到时域结果后，运用FFT求出了有源天线的振荡频率。
2
Additional negative feedback is provided to set loop gain to unity at the oscillationfrequency, to stabilize the frequencyofoscillation, and to reduce harmonic distortion.
为了使振荡频率稳定并降低谐波失真，需要加入一个在震荡频率处能够提供单位增益的负反馈路径。
3
They "want" to oscillate at a given frequency in the same way that a violin string does — a small amount of energy fed into the system, in almost any form, creates the oscillation.