Band-Stop Filter with Multi-Frequency Bandpass and Negative Group Delay Function
摘要
A band-stop filter that can realize multi-frequency negative group delay function in the passband is designed. It is composed of a negative group delay circuit and a band-stop filter. The entire structure of the circuit is composed of resistors, capacitors and inductors. The influence of different component values on the negative group delay and insertion loss of the circuit is analyzed. The actual measured values of the circuit are consistent with the simulation results. The function of multi-frequency negative group delay can be realized. The center frequency frequencies of the negative group delay are 154 MHz, 206 MHz and 316 MHz, respectively. It produces a minimum group delay of -16.82 ns at 154 MHz, 206 MHz and 316 MHz center frequencies with an insertion loss of no more than -7.5 dB.