Physically derived micro-modeling circuit for loop antenna of arbitrary shape

A passive circuit model is proposed for loop antennas of arbitrary shape, which is derived from the partial element equivalent circuit (PEEC) model using a physically meaningful micro-modeling method without any approximation. Different from the conventional method, the frequency-dependent electromagnetic couplings and radiation effects are reflected by frequency-dependent inductive couplings and radiation resistance, which can describe the antenna working mechanism more reasonably. In this paper, the variation tendency of the circuit elements for different working frequencies is presented to reveal the radiation characteristic of the loop antenna.