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m-Derived SectionsStructures known as m-derived sections have good impedance characteristics and sharp cutoff frequencies. In Fig. 42 are shown T, or mid-series, sections, and as explained in the preceding section m-derived and constant-k sections are used together to make composite filters. These m-derived sections have attenuation characteristics shown in Fig. 43. It will be noted that both m and a are shown on these curves, the relation between these two quantities being as follows
where
In this relation f∞ is the frequency at which the attenuation of the m-derived section reaches a theoretical value of infinity (Fig. 43), and fc is the cutoff frequency of the constant-k prototype, that is, the constant-k section to which the m-derived section is related by the factor m. Referring to Fig. 42, if m = 1.0, the derived sections become the constant-k prototype.
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Last Update: 2011-05-30