Feigin & Fridman, LLC has obtained the following 53 United States patents in Electrical — Communications & RF for our clients. Click any patent for full details, drawings, and the issued PDF, or search the full patent database.
Method and apparatus for a linearized RF amplifier current source
Method and apparatus for a shielding structure of surface-mount LTCC devices
Apparatus for shielding of surface-mount devices
Method and apparatus for a miniature broadband RF power divider
DC electronic switch with temperature independent current limit
Surface dielectric measurement method and apparatus
Triple axis magnetic actuator through non-metallic substrate
Magnetically operated electro-mechanical latching switch
Geometrically inverted ultra wide band microstrip balun
Retractable camera for vehicle
Vaisman baluns and microwave devices employing the same
Miniature multi-decade GHz balun
Tunable microstrip and T-junction
Ultra-low noise VCO
Low-noise amplifier with high linearity
Image recording apparatus with slidable concealing cover
Single side band (SSB) mixer
Single side band mixer
Frequency synthesizer using a phase-locked loop and single side band mixer
High reliability microwave mechanical switch
Low loss and high frequency lumped capacitor
Electromechanical radio frequency switch
Frequency synthesizer using a phase-locked loop and single side band mixer
Automatic biasing and protection circuit for field effect transistor (FET) devices
Low temperature co-fired ceramic sub-harmonic mixer
Low cost planar double balanced mixer
Directional coupler
Wide frequency range agile voltage controlled oscillator
High power directional coupler
Miniature high performance coupler
Low temperature co-fired ceramic double balanced mixer
Tunable amplitude unbalance stripline combiner
Ultra high isolation mixer
Miniature wideband bias tee
Miniature wideband RF choke
Miniature LTCC 2-way power splitter
System for detecting and storing digital pictures
Three way power splitter
Low cost splitter
Power splitter
LTCC fet mixer
Double balanced FET mixer with high IP3 and IF response down to DC levels
High isolation mixer
Isolation of miniature filters
Transient protection circuit of Darlington amplifier
Triple balanced mixer
Power splitter having counter rotating circuit lines
Dual double balanced mixer
Miniature 180 degree power splitter
Directional coupler
Band pass filter
Scanning antenna with ferrite control
Programmable compensated digital delay circuit
