Re-adjustments for MOM calculations of microstrip and stripline power dissipation

Abstract

Microstrip and stripline losses in Method of Moments (MOM) calculations have an error arising from the large current density at the strip edges, characterized by an integration limit (W/2-d) in the equation for current density in thin strips (width W), where d is a fitting parameter. It depends primarily on the width of the MOM subsection on the edge of the strip. By comparing with the integration limit (W/2-Δ) for an actual strip with finite thickness, a correction factor is estimated. The equations incorporating d are confirmed by comparing with MOM calculations of isolated stripline, uniformly spaced parallel strips, striplines and microstrips close to ground planes, and with a strip in a uniform, externally applied magnetic field. The results are also consistent with measurements with copper. This makes the accuracy of the loss estimates commensurate with the excellence of the other aspects of MOM simulations.

Suppression of spurious harmonic responses in superconducting microstrip spiral filters using gold overlay and stagger tuning

“…Meanwhile the real strip has finite thickness (800 nm) with current also flowing in the side‐walls. Comparing data in [26] with [27] suggests that the surface resistance may be as much as 20% less than estimated, but [27] was not yet available at the time of this work; also, it does not specifically consider two different materials in combination.…”