Switched multiplexer with flat group delay and channelized limiting
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsAndrew C. Guyette, Eric J. Naglich
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Abstract
Systems and method are provided for a switching circuit that enables attenuation of high power signals in relatively small band(s) without attenuating information in other bands. Embodiments of the present disclosure provide switching circuits with intrinsically switched filters that enable channelized limiting without affecting adjacent channels. Further, embodiments of the present disclosure provide a unique filter coupling topology that enables filters to be switched on or off without changing the input impedance of the filters.
Claims20
A switching circuit, comprising:
- first filter circuitry configured to filter signals in a first frequency band used by a first channel;
- and
- second filter circuitry, configured to filter signals in a second frequency band used by a second channel, comprising an intrinsically-switched filter subsection, wherein the intrinsically-switched filter subsection comprises:
- an adjustable capacitor having an adjustable capacitance C1, and
- a fixed capacitor having a fixed capacitance C2, wherein an inter-resonator coupling between resonators of the first filter circuitry and the second filter circuitry is configured to be canceled based on values of C1 and C2 when the intrinsically-switched filter subsection is switched to an off state to disable filtering for the second frequency band.
An intrinsically-switched coupling section of a filter, comprising:
- a pair of coupled transmission lines, comprising:
- a first transmission line, and
- a second transmission line, coupled to the first transmission line, wherein the pair of coupled lines has a first transmission line parameter y11 and a second transmission line parameter y12;
- an adjustable capacitor having an adjustable capacitance C1;
- and
- a fixed capacitor having a fixed capacitance C2, wherein an inter-resonator coupling, coupled to the intrinsically-switched coupling section and coupled between resonators of the filter, is configured to be canceled, based on values of y11, y12, C1, and C2, when the intrinsically-switched coupling section is switched to an off state.
A filter, comprising:
- a first fixed filter subsection coupled to an input circuit;
- a second fixed filter subsection coupled to an output circuit;
- and
- an intrinsically-switched filter subsection configured to be coupled to the first fixed filter subsection and the second fixed filter subsection in an on state and to be decoupled from the first fixed filter subsection and the second fixed filter subsection in an off state, wherein the intrinsically-switched filter subsection comprises:
- an adjustable capacitor having an adjustable capacitance C1, and
- a fixed capacitor having a fixed capacitance C2, wherein an inter-resonator coupling coupled between resonators of the first and second fixed filter subsections is configured to be canceled based on values of C1 and C2 when the intrinsically-switched filter subsection is switched to the off state.
Dependencies are inferred from the claim text.