L-C Filter with impedance transformers

Details L-C Filter with impedance transformers L-C Filter with impedance transformers

1980-05-08

1982-12-07

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333 32, 333168, H03H 7075, H03H 709, H03H 738

Patent

active

043630090

ABSTRACT:
Input signals having a particular impedance in a particular frequency range are provided. A first transformer has at its input a particular impedance in the particular frequency range and provides a change at its output to a second impedance in the particular frequency range. A filter is constructed to receive the signals from the first transformer and is provided with the second impedance in the particular frequency range. When the second impedance is lower than the particular impedance, the operation of the filter at the second impedance is advantageous because the size of the inductances in the filter is significantly reduced without impairing the quality of the inductances or increasing energy losses in the inductances.
A second transformer is constructed to receive the signals from the filter. The second transformer provides the second impedance at its input and provides at its output a change to the particular impedance in the particular frequency range. Means are connected to the second transformer for providing output signals having the particular impedance in the particular frequency range.

REFERENCES:
patent: 2255642 (1941-09-01), Artzt
patent: 2525566 (1950-10-01), Terlecki et al.
patent: 3060389 (1962-10-01), Kahn
Rogers-"The Theory of Electrical Networks in Electrical Communication and Other Fields", MacDonald, London, 1957, pp. 136-139 & title page.

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