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MOTIVATION: High Q Tunable Devices for VHF-UHF Applications

  VHF Tunable Inductors
bullet30 MHz < fc< 300 MHz
bullet 20 % Tuning Range
bulletTuning Field: ± 50 Oe
bullet (df/f) > 20% Q > 800
bullet Ambient T operation
  UHF Tunable Resonators
bullet300 MHz < fc< 3 GHz
bullet< 1 dB Insertion Loss
bulletTuning Field: ± 100 Oe
bullet(df/f) > 10% Q > 500
bullet Ambient T operation

Principal Application: Command node encryption/isolation SINCGARS / HAVEQUICK radios.

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5- pole Chebyshev BPF

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BW= 1.2%

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Ripple = 0.25 dB

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fc = 80 MHz

High-Q Magnetically Tunable Bandpass Filter Response

Tunable toroidal inductor fabricated  with  tape wound Metaferrite.