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US 5,148,133 AGranted
Quality factor improvement for filter applications
AssigneeEagle Comtronics, Inc.
InventorsJoseph A. Zennamo, Jr., Gary J. Clark
Life of this patent
Estimating the term…
Abstract
A tuned filter having an improved Q is disclosed in which two or more inductors are placed in parallel to increase the net Q relative to a single inductor of the same net inductance and/or two or more capacitors are placed in series to increase the net Q relative to a single capacitor of the same net capacitance to improve the Q of a tuned filter.
Claims11
A filter comprising:
- an input terminal and an output terminal;
- a first network, including at least two series capacitors connected to at least two inductors and at least one capacitor arranged in parallel, coupled to the input terminal and electrical ground;
- a second network and a third network connected in parallel and coupled to the input terminal and the output terminal, wherein the second network includes at least two inductors coupled in parallel and the third network includes at least one capacitor connected in series to at least two parallel inductors.
A filter comprising:
- an input terminal, an output terminal and an isolation section located between the input terminal and the output terminal;
- a first filtering section comprising a first network including at least two series capacitors connected to at least two inductors and at least one capacitor arranged in parallel, wherein the first network is connected to the input terminal and electrical ground, a second network and a third network connected in parallel and coupled to the input terminal and the isolation section, wherein the second network includes at least two inductors coupled in parallel and the third network includes at least one capacitor connected in series to at least two parallel inductors;
- and
- a second filter section comprising a fourth network and a fifth network connected in parallel and coupled to the isolation section and the output terminal, wherein the fourth network includes at least two inductors coupled in parallel and the fifth network includes at least one capacitor connected in series to at least two parallel inductors, and a sixth network including at least two series capacitors connected to at least two inductors and at least one capacitor arranged in parallel, wherein the sixth network is coupled to the output terminal and electrical ground.
1 more element
A filter comprising:
- an input terminal and an output terminal, a first network coupled to the input terminal and electrical ground including at least one capacitor connected in series to the combination of at least one capacitor coupled in parallel with a plurality of inductors, a second network coupled to the input terminal and the output terminal including at least one inductor connected in parallel to the combination of at least one capacitor coupled in series with a plurality of parallel inductors.
Dependencies are inferred from the claim text.