This paper describes the design，fabrication and experiments of the 5and 7-element Tchebyscheff MIC filters. Exeperimental results show that the pass-band attenuation a1most doesn't increase as n is increased. It is a1so shown that the accuracy of both the permittivity of the substrate and the strip 1ength bas important effect in calcu1ating the pass-band shift. Finally，a simple formu1a for calcu1ating this effect is given.