The Accidental Engineer

sometimes informative, sometimes funny, always interesting

How wide can you go?

We often get asked about how wide a filter’s bandwidth can be made.  Typical filter technologies are limited to approximately 75% BW or so.  For applications where ultra-wide, multi-octave bandwidths are required, you would need more than an ordinary filter.  The best filter choice for bandwidths in the 150% range would be a design utilizing Suspended Substrate Technology (SST).

 

SST is a printed board topology that utilizes a double-sided printed board between two ground planes with air dielectric traces that mirror the circuit printed on the board.  Ultra-wide responses are realized by combining highpass and lowpass circuits to create filters and multiplexers.

 

Using SST, achieving passbands from 2 to 18 GHz or 18 to 40 GHz and beyond are entirely possible.  If you have ultra-wide bandwidth requirements, please contact us, and we will show you how well SST will work for you.