Computation of In-Plane and Characteristic Impedance of Microstrip Structure under Plasmonic Resonance

In-plane impedance and characteristic impedance of planar microstrip structure is analytically computed for the surface oscillation of electrons owing to formation of surface plasmon polariton. Dimensional parametric ranges are kept in millimeter range for practical design and impedance is computed upto X band from the knowledge of propagation vector variation. Both Faraday inductance and kinetic inductance are separately computed for calculating in-plane impedance, where skin depth for that particular material of the stripline is considered. Realistic materials with standard range of electron density are considered for simulation work. Very low magnitude of characteristic impedance and moderate value of im-plane impedance together reveal sustainable plasmonic resonance for the microstrip structure along the plane of propagation.