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US 2011/0187448 A1Published application
Wideband analog bandpass filter
AssigneeHittite Microwave Corporation
InventorMichael Koechlin
Life of this patent
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Abstract
A wideband bandpass filter includes an RF input terminal, an RF output terminal, a plurality of electrically tunable coupling capacitors coupled in series between the RF input and output terminals, and a plurality of resonating circuits each including an electrically tunable resonator capacitor coupled to one of the coupling capacitors. At least one resistance is coupled in series between at least one of the coupling capacitors for providing enhanced out of band rejection of the filter.
Claims25
A bandpass filter, comprising:
- an RF input terminal;
- an RF output terminal;
- a plurality of electrically tunable coupling capacitors coupled in series between the RF input and output terminals;
- a plurality of resonating circuits each including an electrically tunable resonator capacitor coupled to one of the coupling capacitors;
- and
- at least one resistance coupled between the RF input and output terminals in series with at least one of the coupling capacitors for providing enhanced out of band rejection of the filter.
3 more elements
A bandpass filter, comprising:
- an RF input terminal;
- an RF output terminal;
- a plurality of electrically tunable pairs of varactors coupled back-to-back in series between the RF input and output terminals;
- a plurality of resonating circuits each including an electrically tunable resonator capacitor coupled to one of the pairs of varactors;
- and
- at least one resistance coupled in series between at least one of the pairs of varactors for providing enhanced out of band rejection of the filter.
3 more elements
Dependencies are inferred from the claim text.