Modeling of microstrip line characteristics with side grounded conductors near air–substrate boundary

Abstract

The modeling of the microstrip line with side grounded conductors located near air-substrate boundary is performed. The dependences of per-unit-length delay and the characteristic impedance on a distance between the grounded conductors are calculated with a change in the height above the boundary and the burying into the substrate. The change of the points of zero sensitivity of the per-unit-length delay to the position of the side grounding conductors over and under the air-substrate boundary is investigated. The possibility of obtaining a minimum (up to zero) sensitivity of the impedance to the height of the side grounding conductors near the air-substrate boundary is revealed.