The research and development division of SARAS is dedicated to the continuous improvement in engineering excellence.


Machined Combline and Interdigital

Machined Combline filters consist of short circuit stub resonators inductively coupled, to offer a low loss (high Q), rugged compact design. The resonators are capacitively loaded and are typically 45 degrees long at their resonant frequency giving a very broad upper stopband with high levels of attenuation.


SARAS combline filters use rectangular (or circular) rods machined, generally, from solid aluminium to achieve low weight and are silver plated to give the lowest possible passband loss.

  • Frequency Range: 100MHz to 18GHz

  • Bandwidth: 1% to 40%

  • Stopband: up to 6 x Fc

Interdigital filters use rectangular quarter-wave resonators, machined from solid, to offer symmetrical responses, even for very wideband filters. The electrical and mechanical characteristics are similar to combline but the resonators are longer and are alternatively inverted. The longer resonators produce a lower upper stopband frequency.

  • Frequency Range: 800MHz to 20GHz

  • Bandwidth: 1% to 50%

  • Stopband: up to 2.5 x Fc

3G Band Stop Filter 10955
Wireless Camera Channel Filter 8625

SARAS Technology Ltd,
Windmill House, 277 Tong Road,
Leeds, LS12 4NQ
United Kingdom

T: +44 (0) 113 230 8450
F: +44 (0) 113 279 6218

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