access icon free Lowpass filters with almost-maximally flat passband and Chebyshev stopband attenuation

A class of the almost-maximally flat (AMF) lowpass filters with Chebyshev stopband attenuation, referred to as AMF filters, is discussed. Allpole lowpass filters’ transfer functions are first derived by using parameters and of modified Jacobi polynomials such that passband attenuation is minimised, and obtained transfer functions are then augmented by adding one or several pairs of -axis transmission zeros. The magnitude characteristics of proposed filters are compared with those of the Chebyshev II filters and are found to be superior, both in the passband and in the stopband.

Inspec keywords: band-pass filters; low-pass filters; Chebyshev filters; transfer functions

Other keywords: Chebyshev stopband attenuation; AMF filters; transfer functions; almost-maximally flat passband; Chebyshev II filters; modified Jacobi polynomials; magnitude characteristics; all pole lowpass filters

Subjects: Filters and other networks

References

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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.3390
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content/journals/10.1049/el.2017.3390
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