EM Modeling of Microstrip Conductor Losses Including Surface Roughness Effect

Abstract

This letter presents a method to model conductor losses in transmission lines utilizing a commercial full wave solver. The lines consist of multilayered metallization with inherent surface roughness. Metal thickness is assumed to be larger than skin depth. To validate accuracy of the modeling, the measurements of a 50-microstrip line and edge-coupled microstrip filter are provided, with random errors taken into account. Good correlation between the modeled results and measurements has been demonstrated from this comparison.

Frequency Triplexer for Ultra-Wideband Systems (6–9 GHz)

“…The higher insertion loss from the measurements can be explained by the surface roughness that is not included in the simulations because Momentum in ADS does not support that. It is a known fact that surface roughness increases insertion loss [23], [42], [43]. Actually surface roughness could in the worst case add even more than the difference seen here, roughly up to half a dB at the line-lengths used here at 6-9 GHz [23].…”

Design and implementation of a UWB six‐port correlator for 6–9 GHz frequency band

“…It is found that the measured results have higher insertion loss than the simulated results and the frequency band is slightly shifted in the measured results. This higher insertion loss is likely a result of surface roughness [16, 17] because ADS (2009) simulation does not take roughness into count [15]. The frequency band is little shifted toward lower frequency but still covering the whole target frequency band (6–9 GHz).…”

A Frequency Triplexer for Ultra-Wideband Systems Utilizing Combined Broadside- and Edge-Coupled Filters

“…The higher insertion loss from the measurements can be explained by the surface roughness that is not included in the simulations because ADS does not support that. It is a known fact that surface roughness increases insertion loss [39], [40]. From [39] the insertion loss due to roughness for an equivalent microstrip-line can be estimated to be from 0.06 to 0.10 dB/cm within the 3.1-4.8 GHz frequency-band.…”