关键词: 过孔位置, 不同种类过孔, 反谐振, Z参数, 传输效果

Abstract:

The anti-resonant effect of the plane inspired by the via has a serious impact on the transmission effect. To overcome this shortcoming, a novel method, based on the combination of the via and plane resonance, is proposed. The two ports have the same anti-resonant frequency, which don't be discussed in suppressing modal impedances. By introducing the impedance parameter Z of the linear network, the new method can accurately predict whether the transmission effect of two vias which have the same anti resonant frequency is better than that of a single via. Different kinds of vias are tested and discussed. Our extensive experiments lead to two useful finding. First, the through via should be employed when the plane's anti-resonant effects are taken into account. Second, when the signal's path alters twice due to vias, the return path just changes at the via nearest to the plane's edge.

Key words: the position of vias, different types of vias, anti-resonant modal, Z parameter, insertion loss