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RF Filters and Diplexers

Cavity/Discrete/Waveguide/Ceramic/Wireless Filters

Series of discrete lumped element filters and diplexers with standard “off the shelf” packaging utilizing the same internal components, circuit topologies and transfer functions found in Lorch filter products manufactured for military and space applications. Standard units are an ideal choice when hermetic sealed packages are not a requirement and when lower cost and quick delivery are essential.

Features & Benefits

Cavity filter designs are available in the frequency range of 30 MHz to 40 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. 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. 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. Standard cavity filters generally are designed using aluminum as the base metal. 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.

  • 30 MHz to 40 GHz
  • 3 dB Bandwidths from <0.5 to >66%
  • High "Q", Low Loss
  • Computer-Aided Designs
  • Helical, Combline, Interdigital Waveguide
  • 12 Stock Series

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