SIW FILTER - Overview

ECHO Microwave has developed a new filter by using substrate integrated waveguide which can be
synthesized on a planar substrate and usually called SIW Filters. This filter generates via-holes on
PC Board to make the waveguide and it makes easy to connect with other circuits. This concept is
attractive for filter design, because it is helpful to reduce the size compared to existing filters
such as ceramic and lumped filters. It is possible to make the SIW filter from 8GHz to 40GHz, but the
SIW filter has a strong advantage for high frequency bands.

We use the materials for the SIW Filter that has small values of Dissipation Factor which has 0.0009
value at 10G. So, it has high-Q factor and very low insertion loss. In case of ceramic and LC filters,
it is not easy to apply the frequency ranges over 10GHz,but the SIW filter is available up to 40GHz and
it is possible to generate the broad bandwidth. We can offer the surface-mount and connectorized designs
in a small size and at low cost compared to cavity or waveguide filters.

The size is very smaller than cavity products, but it has high performance and it can endure high power up
to 50W.