Abstract :
Achieser-Zolotarev filters are similar to the familiar Chebyshev low-pass filters except for a large-amplitude first ripple (near dc). If a low-pass filter is required for operation only over the upper frequency portion of the band, an Achieser-Zolotarev filter may be used to give greater attenuation in the stopband for a given ripple level. The new filters give increased flexibility in the choice of impedance level within the filter, leading to improved design for distributed-element filters. The design tables for filters of 5, 7, 9, and 11 elements include the coefficients of the Zolotarev polynomials, the comparative stopband attenuation relative to the Chebyshev case, and the element values of lumped-element quasi-low-pass filters for various pass bandwidths and ripple levels of 0.01, 0.1, 0.2, 0.5, and 1.0 dB.
