Submitted by Dance Wu, Marvell: I have heard that Microstrip radiates about 25 times more over stripline structure, Why is this?
First, the radiation from Microstrip is really, really small. There are no good approximations for it, other than the magnetic dipole antenna model, and this is for a narrow wire, not a trace over a wide ground plane. So, the fact that there may be a 25 dB difference between microstrip and stripline, doesn’t mean avoid microstrip because it radiates. The largest source of radiation in microstrip is from the finite width plane. It is the inductance in the return path that causes a very small ground bounce across the plane which actually does the radiating. The reason stripline radiates much less is related to the distribution of the currents. The easiest way of thinking about it is to first consider a coax. There are no external fields around a coax because the return current is symmetric in the shield with the signal current in the central conductor. Since there are no E or B fields external to the conductor, there is no ground bounce in the cable nor any radiation. The more you can ma
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