![]() Examples of pole-zero systems include phase or amplitude equalization networks (i.e., there is a modest boost or cut over a limited frequency range), overlapping transmission line structures (you can think of a flat solenoid inductor as a parallel-wire transmission line, looped in on itself, so that each turn acts as a transmission line against the turn near it, but the turns are also connected by the delay of that transmission line), etc. Examples of all-pole systems are simple transmission line* structures, and most filter designs (any that do not have zeroes (notches) in their response). The elliptical filter is a pole-zero filter, meaning it has notches in the stop band. A filter with zeroes will have, well, zeroes (notches) at certain frequencies. ![]() An all-pole filter simply means its transfer function is of the form: H(s) = 1 /, i.e., the numerator is constant. ![]() There is no physical embodiment, it's a description of the frequency response.
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