Abstract
A band-stop filter with three different negative group delay functions in the passband, namely, band pass, high pass and low pass, is proposed, which has small insertion loss. The capacitance, inductance, and resistance meet different conditions, and the circuit can realize three different negative group delay characteristics. The theoretical calculation and equation derivation are given. A band-stop filter with negative group delay function is fabricated, and the measured results are basically consistent with the simulation results. The correctness of the design is verified.
Highlights
Band-stop filters (BSFs) are used for blocking undesired signals in RF/microwave systems [1]
In [17], a compact D-CRLH resonator for low-pass filters with wide rejection band, high roll-off, and transmission zeros is proposed. e filter has wide rejection band bandwidth with three transmission zeros (TZs). e filter bandwidth and TZ frequencies are controlled by the D-CRLH element values, and the filter has minimum insertion loss in passband, high roll-off rate, and good figure of merit
Filter is the resonant frequency of the negative group delay circuit. e data are shown in Table 5. e group delay and insertion loss characteristics at different R1 are shown in Figures 12 and 13
Summary
Band-stop filters (BSFs) are used for blocking undesired signals in RF/microwave systems [1]. The LC band-stop filter with negative group delay of band pass, high pass and low pass is designed, and the insertion loss in the frequency range of negative group delay is improved. Due to the change in C2 value, the frequency of minimum negative group delay changes E data are depicted in Tables 3 and 4 At this time, only the resonant frequency of the band-stop filter changes and the negative group delay value in the passband and the corresponding negative group delay frequency remain unchanged. Filter is the resonant frequency of the negative group delay circuit. e data are shown in Table 5. e group delay and insertion loss characteristics at different R1 are shown in Figures 12 and 13
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