Suspended Substrate

Using the very latest filter design techniques BSC’s Lumped Element filters exhibit low insertion loss

Suspended Substrate Filters

Suspended Substrate StripLine (SSS) filter technology enables high frequency (up to 40 GHz) broadband filters to be realised utilising elliptical responses for excellent close-in rejection.

SSS technology utilises a photo-etched, copper-clad dielectric substrate (usually PTFE) secured between silver plated machined casings, to provide outstanding performance in terms of high Q and low insertion loss, combined with a small, lightweight yet rugged construction. This type of filter is ideally suited to broadband applications such as Electronic Warfare systems (ECM, ESM & ELINT). SSS design capability covers the full range of filter structures.


  • Lowpass
  • Highpass
  • Bandpass
  • Bandstop
  • Parabolic Gain Equaliser
  • Linear Gain Equaliser


  • Frequency Range: 500 MHz to 40 GHz
  • Bandwidth: 10% to multi-octave
  • Extended Stopband: Up to 50 GHz
  • 60 dB rejection achieved at 15% from bandedges (tighter specs available on request)
  • Tight phase & amplitude tracking
  • Excellent repeatability, stability
  • Rugged construction for Military environment
  • Customised outlines available
  • Rapid prototyping available

Fig.1: Typical plot of 2.6 to 13GHz High Pass Filter