Impedance Matching using Half Sections: While connecting number of different sections in the filter, it is very important to match the impedances of the sections at the junction points. Thus a T section should not be connected to a π section directly as both the sections have different impedances. Hence it is necessary to use […]

m Derived Band Stop Filter: The m Derived Band Stop Filter can be derived from the prototype band elimination filter section in the exactly same way as the m-derived band pass filter. The m Derived Band Stop Filter section is as shown in the Fig. 9.37. The relationship between frequency of infinite attenuation (f1∞ , […]

m Derived Band Pass Filter: We can obtain m Derived Band Pass Filter if the prototype band pass filter is simplified according to the network in the Fig. 9.35 which has been used to obtain m-derived low pass and high pass sections. The T section in each case will have a shunt impedance, Z2/m + […]

m Derived High Pass Filter: The m Derived High Pass Filter T and π sections are as shown in the Fig. 9.32 (a) and (b). Consider that the shunt arm of the T section resonates at a frequency of infinite attenuation i.e. f∞ which is selected just below cut-off frequency fc. The frequency of resonance is […]

m Derived Low Pass Filter: The m Derived Low Pass Filter T and π sections are as shown in the Fig. 9.29 (a) and (b) respectively. Consider that the shunt arm of T section resonates at the frequency of infinite attenuation i.e. f∞, which is selected just above cut-off frequency fc. The frequency of resonance […]

m Derived Filters: m Derived Filters – The first disadvantage of prototype filter sections can be overcome by connecting two or more prototype sections of same type (either all T type or all π type) in cascade. In such a cascade connection, attenuation to the frequencies in pass band remains zero ideally, but attenuation to […]