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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.