Cancellation technique for bandpass filters using a narrowband n

Details Cancellation technique for bandpass filters using a narrowband n Cancellation technique for bandpass filters using a narrowband n

1996-06-13

1998-02-24

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333174, H03H 701

Patent

active

057215189

ABSTRACT:
A bandpass filter network having a first two pole filter and a second two pole filter provided in parallel to the first two pole filter. The first filter is optimally coupled while the second filter is extremely overcoupled. Moreover, the first filter and second filter are shifted 180.degree. out of phase with one another. This phase shift is preferably accomplished by a balun transformer. Alternatively, the 180.degree. phase shift may be accomplished by having the first and second filters utilizing different forms of coupling (i.e., one inductively coupled, the other capacitively coupled).

REFERENCES:
patent: 2875283 (1959-02-01), Maione
patent: 3582839 (1971-06-01), Pim
patent: 3737813 (1973-06-01), Buecherl
patent: 4396893 (1983-08-01), Edson
Graf, Modern Dictionary of Electronics, p. 700 1988.

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