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US 7,068,129 B2Granted
Tunable waveguide filter
AssigneeRockwell Scientific Licensing, LLC
InventorsJohn A. Higgins, Hao Xin
Life of this patent
Estimating the term…
Abstract
A tunable filter includes a waveguide with at least one resonant cavity and a tunable impedance structure coupled to each resonant cavity. Each resonant cavity has a resonant frequency and its corresponding impedance structure can be tuned to adjust the resonant frequency. The filter transmits the signal in a pass-band that includes the resonant frequency and reflects signals outside the pass-band.
Claims28
A tunable filter, comprising:
- a waveguide with at least one resonant cavity, the inside surfaces of each of said resonant cavities comprising a reactive surface impedance structure which is electronically tunable in a band of frequencies around a common resonant frequency, such that varying said surface impedance varies the propagation constant of a signal transmitted through said resonant cavity and thereby the common resonant frequency of said resonant cavity.
A tunable filter, comprising:
- one or more resonant cavities, the inside surfaces of each cavity having a reactive surface impedance structure which is electronically tunable in a band of frequencies around respective resonant frequencies, said electronically tunable reactive surface impedance structures being adjustable so as to vary the propagation constants of signals propagating through said cavities so that said filter is adjustable to a desired resonant state and frequency response.
Dependencies are inferred from the claim text.