Linear phase filter with self-equalized group delay

Details Linear phase filter with self-equalized group delay Linear phase filter with self-equalized group delay

1981-08-11

1983-07-26

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333168, 333176, 333178, H03H 7075, H03H 709

Patent

active

043956882

ABSTRACT:
In modern communication systems, it has become important to provide filters, and in particular bandpass filters, which can provide substantially uniform group delay across the bandwidth of the filter while still achieving good amplitude response. In this regard, it is particularly desirable to substantially reduce the large variations in the phase characteristics found in conventional bandpass filters at the nominal band edge of the filter. To accomplish this, a filter is provided having at least one pair of lattice arms coupled in parallel to one another between the input and output of the filter. Each of the lattice arms includes a plurality of resonant LC resonators, each of the resonators having a different resonant frequency than the center frequency of the filter. In particular, within the bandwidth of the filter, the exponential damping coefficients for the resonators in each arm are set to decay at the same rate. This desired decay can be accomplished by exponential sizing of the components.

REFERENCES:
patent: 3119067 (1964-01-01), Wohlenberg et al.
patent: 3222970 (1967-05-01), Batteau
patent: 3252093 (1966-05-01), Lerner
patent: 3316483 (1967-04-01), Hall
patent: 3365679 (1968-01-01), Matsumoto et al.
Lerner--"Band-Pass Filters with Linear Phase", Proceedings of the IEEE, Mar. 1964, pp. 249-268.

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