Analysis of Permeability Characteristic of Planar Antenna with Spiral Resonator (SR) Shape

Structural analysis of antenna configuration is becoming prominent for drawing up behavioral characteristics of the antenna. This paper deals with the permeability characteristic analysis of planar antenna configured by a spiral resonator (SR) shape. The analysis is performed by modeling the SR shape planar antenna using its equivalent circuit to formulate the permeability (µ) of antenna. To calculate the parameter of parts in the equivalent circuit, including resistance, capacitance, and inductance, the formula of Clausius-Mossotti suitable for SR structure are implemented, thereby obtaining the effective impedance of antenna. Based on these formulations, behavioral characteristics of the antenna are observed, and its permeability characteristic as the frequency dependency is then visualized. It shows that the effective permeability has the real value of −2.5 at the lowest frequency of 0.1GHz, which is relatively unchanged to the number of spiral turns. Meanwhile, the imaginary part shows the frequency trend shifts to the lower frequency as the number of spiral turns increases.