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Cavity Filters

Cavity filter designs are available in the frequency range of 30 MHz to 51 GHz and with bandwidth options from less than 0.5% to over 66%. Cavity filters offer the user very low insertion loss, steep skirt selectivity, and narrower bandwidths than discrete component filters.

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Features & Benefits

  • Frequency range: 30 MHz to 40 GHz
  • 3 dB Bandwidth: 0.5% to 66%
  • High "Q", low loss
  • High power
  • Helical, combline & interdigital
  • Bandpass, notch, diplexed & multiplex


Cavity filter performance is based on parts selection and physical layout of the helical coils, resonators, as well as the shape and size of the cavity housing. Smiths Interconnect offers the user 12 unique stock designs to satisfy the majority of applications. At lower frequencies a helical coil is used to excite the electromagnetic field, while a 1/8 to 1/4 wave capacitively loaded design is used at higher frequencies. A cylindrical waveguide design is used to achieve narrow bandwidths and high power operation.

Each filter is custom-designed to your exact specification so that you will receive the optimum performance at the lowest cost. Filter performance is easily predicted using our proprietary software, while CAD files are generated for our CNC machine and fabrication center. Complex designs and working drawings can be generated in a matter of a few hours...not weeks.

Standard cavity filters generally are designed using aluminum as the base metal. As most raw metals are inherently lossy, filter housings are silver plated for improved electrical characteristics and current flow. Brass, copper, aluminum or bi-metal resonators are used to minimize frequency drift over temperature.

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