A wideband frequency response is not a characteristic of VC devices. 寬頻響應並非電容可變式設備的特性。
Furthermore, the approach to suppress the spurious response is also discussed so as to enhance the stopband characteristics. 另外針對濾波器的倍頻響應,本論文也提出了改善的方法,並且不需額外增加其他元件而增加設計上的困難度。