Hi Mamali - I work for AWR, and I disagree with this last statement. We have gotten very good results with these types of filters when comparing the MWO circuit models with EM results (and measured data.) Our circuit models are not just closed form equations, or lumped elements. Our coupled line models are based on EM quasi-static simulations that run when you simulate your circuit, and discontinuities such as MTEE and MLEF are based on EM simulation results specific to the user's substrate.mamali said:you should use a resonable substrait, which is available at the market, you may use this:htforever said:Now I changed my substrate, A substrate for high frequency circuit.
Er=2.8, H=1mm. But I don't know the tanD, is 0.02 OK?
RT/duroid 6002 ; er=2.94 +/- 0.04; loss tangent: tand= 0.0012 (at 10GHz). but this is an expensive material . dont forget to search for an available substrait, it is very impotant, and you can not gain a practical design, if your substrait is not achievable.
and, the simulation results (MoM is better, especially Zelan d's IE3 D), should be trusted, not the lumped elements models (such as what is available in Micr0wave 0ffice).
dear al,AL0117 said:Hi Marti,
this filter needs a little tuning, the return loss in the passband is poor. You should try to achieve at least 15 dB.