Note: Tunable notch filter based on liquid crystal technology for microwave applications: Review of Scientific Instruments: Vol 84, No 2
ADMV8420 - Analog Devices | Tunable Filter
RI 266 Tunable Notch Filter to meet new RF test requirements | Ranatec
AM Notch filter - Chris Scott and Associates
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A novel dual-band tunable notch filter with controllable center frequencies and bandwidths - ScienceDirect
Schematic of the tunable combline bandpass filter. | Download Scientific Diagram
Smiths Interconnect - Tunable Filter Products
Tunable Filters | PAR Electronics | Filters for the commercial 2 way market, MATV, FM broadcast, laboratory, marine industry, amateur radio, scanner and short wave listening enthusiasts