Characteristics of superquadric loop antennas for mobile communications applications

The authors present the results of a unified formulation capable of modeling many different loop geometries, including circular, square, and folded dipole configurations, through the use of the superquadric curve. The methodology allows analysis of a single superquadric element or of two loops with arbitrary relative position and orientation and possibly different geometries. A Galerkin-type moment method with piecewise sinusoidal basis and weighting functions is used to solve a coupled form of the electric field integral equation (EFIE) for thin wires. The current obtained from this solution is then used to compute the directivity, input impedance, and correlation coefficient (diversity performance) for the antenna configuration. Both delta gap and magnetic frill source models are implemented in the formulation.<>