Tunable rf anti-jamming system (trajs)

Abstract

A tunable band pass filtering for Tunable RF Anti-Jamming Systems is provided. Such embodiments include a first bandpass filter tunable to a first frequency band and a second bandpass filter coupled to the first bandpass filter and tunable to a second frequency band. In addition, a plurality of tunable passive components may be adapted to tune the first and second bandpass filters to the first and second frequency bands, respectively, thereby creating a multiband pass band signal to include the first and second frequency bands and attentuating frequency bands adjacent to the first and second frequency bands.

1 . A tunable multiband bandpass filter, comprising:
 a first bandpass filter tunable to a first frequency band;   a second bandpass filter coupled to the first bandpass filter and tunable to a second frequency band;   a plurality of tunable passive components adapted to tune the first and second bandpass filters to the first and second frequency bands, respectively, thereby creating a multiband pass band signal comprising the first and second frequency bands and attentuating frequency bands adjacent to the first and second frequency bands.   
     
     
         2 . The tunable multiband bandpass filter of  claim 1 , wherein the first bandpass filter forms a first resonator having a first resonating mode corresponding to the first frequency band. 
     
     
         3 . The tunable multiband bandpass filter of  claim 2 , wherein the second bandpass filter forms a second resonator having a second resonating mode corresponding to the second frequency band. 
     
     
         4 . The tunable multiband bandpass filter of  claim 3 , wherein operation of the first and second resonators utilizes superposition of even and odd mode excitations such that application of an even excitation results in an open-circuited symmetrical interface, and application of an odd excitation results in a short-circuited symmetrical interface. 
     
     
         5 . The tunable multiband bandpass filter of  claim 3 , further comprising at least one additional bandpass filter tunable to a third frequency band, the additional bandpass filter forming a third resonator coupled either in series or in parallel relative to the first and second resonators. 
     
     
         6 . The tunable multiband bandpass filter of  claim 3 , wherein the plurality of tunable passive components comprises a plurality of variable capacitors. 
     
     
         7 . The tunable multiband bandpass filter of  claim 6 , further comprising input and output coupling structures. 
     
     
         8 . The tunable multiband bandpass filter of  claim 7 , wherein the input and output coupling structures comprise a coupled-line coupling or a tapped-line coupling. 
     
     
         9 . The tunable multiband bandpass filter of  claim 8 , wherein in accordance with the coupled-line coupling, the plurality of variable capacitors are configured such that a capacitance structure removes zero frequency. 
     
     
         10 . The tunable multiband bandpass filter of  claim 8 , wherein in accordance with the tapped-line coupling, a filter structure comprising the first and second resonators is configured to attenuate zero frequency. 
     
     
         11 . The tunable multiband bandpass filter of  claim 1 , wherein the first and second bandpass filters are controllable via a processor based on a mapping between desired filter specifications including at least the first and second frequency bands and respective center frequencies thereof, and values associated with at least a subset of the plurality of tunable passive components. 
     
     
         12 . The tunable multiband bandpass filter of  claim 1 , wherein the first frequency band comprises a transmit signal associated with a transceiver ahead of which the tunable multiband bandpass filter is situated, and wherein the second frequency band comprises a receive signal associated with the transceiver. 
     
     
         13 . The tunable multiband bandpass filter of  claim 1 , wherein the first and second bandpass filters are controllable via a processor based on a mapping between desired filter specifications including at least the first and second frequency bands and respective center frequencies thereof, and values associated with at least a subset of the plurality of tunable passive components.