Lumped Element Filters

Using the very latest filter design techniques BSC’s Lumped Element filters exhibit low insertion loss, good VSWR and steep-skirt selectivity.

This type of structure is very versatile and well suited to a variety of market applications, including Broadcast, Telecommunications, SatComs & Defence and is available in a variety of filter configurations.


  • Highpass
  • Lowpass
  • Bandpass
  • Notch
  • Multiplexer
  • UHF – VHF
  • Frequency Range: 300kHz to 3GHz
  • Bandwidth: 1% to multi-octave
  • Stopband: up to 10 times Fc
  • Suitable for Lowpass/Highpass/Bandpass, Notch & Multiplexer devices
  • SMT or connectorised package options available

Suspended Substrate Filters

Suspended Substrate StripLine (SSS) filter technology enables high frequency (up to 40GHz) 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
  • Multiplexer
  • Parabolic Gain Equaliser
  • Linear Gain Equaliser
  • Features
  • Frequency Range: 500MHz to 40GHz
  • Bandwidth: 10% to multi-octave
  • Extended Stopband: up to 50GHz
  • 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
  • Fast prototyping service available

Thin Film Filters

Beyond the limits of traditional substrates, Thin Film technology facilitates huge reductions in footprint, whilst maintaining market-leading performance. 


  • Frequency Range: 2 GHz to 18 GHz
  • Bandwidth: 5% to Multi-octave


    • Bandpass
    • Lowpass
    • Highpass
    • Bandstop


      • Phased Arrays
      • UAVs and Missiles
      • High-volume Applications
      • Small-size, Low-mass Applications
      • Temperature-stable Applications

      Miniaturisation of RF Filtering requires an entirely specialised approach to design and manufacture. Surpassing conventional Thin Film technology, BSC utilises materials that offer significant advantages over the traditional Alumina solutions, with improved size, loss, temperature stability and manufacturing repeatability.

      For surface-mount applications where real-estate is critical, BSC Thin Film devices offer performance otherwise unachievable in such a small space. Unique high-k substrates enable high-Q filters to be realised many times smaller than more traditional ceramic or air dielectric-based structures. Thin Film devices offer SAW-style miniaturisation, operating up to 18 GHz, and offering much greater bandwidths.

      The manufacturing process involves tight control and characterisation of the substrate material using highly refined, proprietary techniques. Stringent processing procedures control the tolerances required during manufacture to necessitate absolute accuracy; this in turn precipitates repeatability. Thin Film solutions are attractive not only for their miniaturisation but for high-volume applications in mass-produced modules or phased array antennas.

      Tubular Filters 

      BSC Tubular filters use discs as capacitators and either coiled wire or rods as inductors to form the resonant circuits.

      The structure is enclosed in a tubular earth plane. By using distributed capacitors and inductors these filters have lower insertion loss than lumped element structures. We specialise in the design and manufacture of customised, high performance filters.

      Frequency range: 20MHz to 12GHz
      Bandwidth: 2% to 50%
      Stopband: Up to 10 times fc.

      Waveguide Waffle Iron

      BSC Filters’ Waffle Iron filters make use of their internal construction to suppress unwanted Waveguide modes.

      Featuring broad stopbands and low insertion loss, they are ideal for rejecting transmitter harmonics.

      Waveguide Waffle Iron filters are only suitable as a lowpass in the frequency range 1.5GHz to 60GHz, but can be matched across the complete waveguide range if necessary. By suppressing all the unwanted waveguide nodes, waffle iron filters can achieve rejection of up to four times the passband frequency BSC have manufactured Waffle Iron filters at 3GHz with over 100kW of power handling, as well as many others in the 40 to 60GHz band.

      • Bandwidth: 1% to 40%
      • Stopbands: Up to 4 times Fc
      • Frequency Range: 1.5 to 60GHz
      • Broad stopband: low loss
      • Ideal for rejection of Tx harmonics

      Contact Sales

      BSC is a world-leader in the design and manufacture of Microwave filter based active Subsystems, Modules and Filters, from low quantity prototypes, up to high production volumes.

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       We look forward to working with you!