Abstract: Systems and methods are provided for implementing bandstop filters (e.g., RF/microwave bandstop filters) that can automatically tune to a frequency of an interfering signal. Embodiments of the present disclosure provide automatically tunable signal-tracking bandstop filters with a significant reduction in response time, complexity, size, weight, and cost when compared to conventional devices.

Abstract: Systems and methods are provided for implementing bandstop filters (e.g., RF/microwave bandstop filters) that can automatically tune to a frequency of an interfering signal. Embodiments of the present disclosure provide automatically tunable signal-tracking bandstop filters with a significant reduction in response time, complexity, size, weight, and cost when compared to conventional devices.

Abstract: Systems and methods are provided for creating higher order microwave bandstop filters with total through-line length of significantly less than one-quarter wavelength at the filter center frequency. The mixed electric and magnetic field coupling bandstop filter topologies provided by embodiments of the present disclosure can be used to reduce the size, weight, and throughline insertion loss of microwave bandstop filters. In an embodiment, if the relative field strengths are intelligently designed for each coupling structure, effective phase offsets can be produced between resonators along the through line. These phase offsets can be used to absorb some or all of the length of the ?/4 inverters between resonators.

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.

Abstract: Systems and methods are provided for implementing a switched microwave bandstop filter with minimum insertion loss and phase distortion in the bypass state. For example, embodiments of the present disclosure provide systems and methods for implementing self-switching bandstop filters that do not require signal-routing RF switches, allowing for very low passband insertion loss and improved power handling.

Abstract: Systems and methods are provided for creating higher order microwave bandstop filters with total through-line length of significantly less than one-quarter wavelength at the filter center frequency. The mixed electric and magnetic field coupling bandstop filter topologies provided by embodiments of the present disclosure can be used to reduce the size, weight, and throughline insertion loss of microwave bandstop filters. In an embodiment, if the relative field strengths are intelligently designed for each coupling structure, effective phase offsets can be produced between resonators along the through line. These phase offsets can be used to absorb some or all of the length of the ?/4 inverters between resonators.

Abstract: Systems and methods are provided for creating higher order microwave bandstop filters with total through-line length of significantly less than one-quarter wavelength at the filter center frequency. The mixed electric and magnetic field coupling bandstop filter topologies provided by embodiments of the present disclosure can be used to reduce the size, weight, and throughline insertion loss of microwave bandstop filters. In an embodiment, if the relative field strengths are intelligently designed for each coupling structure, effective phase offsets can be produced between resonators along the through line. These phase offsets can be used to absorb some or all of the length of the ?/4 inverters between resonators.

Abstract: Systems and methods are provided for implementing a switched microwave bandstop filter with minimum insertion loss and phase distortion in the bypass state. For example, embodiments of the present disclosure provide systems and methods for implementing self-switching bandstop filters that do not require signal-routing RF switches, allowing for very low passband insertion loss and improved power handling.

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.

Abstract: Systems and methods are provided for creating higher order microwave bandstop filters with total through-line length of significantly less than one-quarter wavelength at the filter center frequency. The mixed electric and magnetic field coupling bandstop filter topologies provided by embodiments of the present disclosure can be used to reduce the size, weight, and throughline insertion loss of microwave bandstop filters. In an embodiment, if the relative field strengths are intelligently designed for each coupling structure, effective phase offsets can be produced between resonators along the through line. These phase offsets can be used to absorb some or all of the length of the ?/4 inverters between resonators.

Abstract: A method for independently tuning bandwidth and center frequencies in a bandpass filter. The filter can be configured with a plurality of resonators, wherein the resonators are coupled over a certain coupling region. Additionally, the filter can be configured with a plurality of tuning elements. For each of the inter-resonator couplings, at least one of the resonators associated with the inter-resonator coupling can have a first tuning element placed at a first location on the resonator and a second tuning element placed at a second location on the resonator. Simultaneously tuning the first and second tuning elements can adjust the center frequency, and offset tuning the first and second tuning elements can adjust the bandwidth frequency.

Abstract: A bandstop filter configured to suppress a spurious resonance frequency includes a resonator and a transmission line that is coupled to the resonator at a first junction and at a second junction with a length ? of transmission line running between the two couplings. The configuration provides two signal paths so that constructive interference occurs at the spurious resonance, and destructive interference occurs at a fundamental bandstop frequency. This provides spurious suppression by effectively cancelling out resonator couplings via the constructive interference, extending the upper passband of the bandstop filter to any degree required by the application.

Abstract: A method for independently tuning bandwidth and center frequencies in a bandpass filter. The filter can be configured with a plurality of resonators, wherein the resonators are coupled over a certain coupling region. Additionally, the filter can be configured with a plurality of tuning elements. For each of the inter-resonator couplings, at least one of the resonators associated with the inter-resonator coupling can have a first tuning element placed at a first location on the resonator and a second tuning element placed at a second location on the resonator. Simultaneously tuning the first and second tuning elements can adjust the center frequency, and offset tuning the first and second tuning elements can adjust the bandwidth frequency.