Stopband rejection in matlab filter designer12/21/2023 The band stop filter with a narrow frequency response is known as a notch filter. Where ω = 2πf = angular frequency Notch Filter (Narrow Band stop filter) The components used in the circuit determines the lower and higher cut-off frequency. Hence, at the mid-frequency range, the filter behaves as a short circuit and is blocked by the filter. This circuit behaves as an open circuit at high and low-frequency ranges due to the capacitor and inductor are connected in series. At the high-frequency range, the capacitor becomes a short circuit and the inductor becomes an open circuit. At low-frequency range, the capacitor becomes an open circuit and the inductor becomes a short circuit. This filter allows all the high and low-frequency components with respect to the cut-off frequency. The input voltage is applied across the resistor and the output voltage is obtained across the inductor and the capacitor. The passive elements R, L, and C are connected in series. This type of filter is mainly used to reduce the distortion in the signal. Since this circuit is designed using low pass and high pass filter circuits. It allows all the frequencies below and above the cut-off frequency of low pass and high pass filter circuit. It is also known as a band-reject filter or band elimination filter or notch filter. The filter that allows above and below the particular range of frequencies and rejects all other frequencies of a given input signal, is known as band stop filter. This article gives a complete description of the band stop filter. As the band stop filter contains two cut-off frequencies for low and high-frequency ranges, it depends on the components used in the circuit. The cut-off frequency of the low pass filter is denoted as fL and the cut-off frequency of the high pass filter is denoted as fH. The band stop filter allows frequency components below the cut-off frequency and above the cut-off frequency. This filter is designed with the low pass filter and high pass filter, which are connected in parallel to allow high and low-frequency components. The name itself shows that it stops or rejects the particular range of frequencies of a signal. The band stop f ilter is a type of frequency selective circuit, that works exactly opposite to the bandpass filter.
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