Near Fields of Electrically Small Thin Square and Rectangular Loop Antennas

Development of wideband circularly polarised square- and rectangular-loop antennas

Abstract: New types of wideband circularly polarised (CP) squareand rectangular-loop antennas are developed and discussed. It is shown that the bandwidth for circular polarisation of a loop antenna can be significantly increased by adding a parasitic loop inside the original loop. The addition of the parasitic element can create one more minimum axial ratio (AR) point, which can appropriately c...

SMALL ANTENNAS Basic Principles of Electrically Small Antennas

E lectrically small antennas have been an important part of communications engineering since the beginning. Whether they are small compared to the extremely long wavelengths used at the lowest radio frequencies, or intended to save space in GHz-range wireless devices, the basic principles are the same. This tutorial will review those principles, with primary attention to describing the performa...

Near Fields of Microstrip Antennas

The paper presents an iterative method for the computation of the near fields of single layer microstrip patch antennas. A judicious combination of the advantages of the MPIE (mixed potential integral equation) method, the FFT algorithm and the biconjugate gradient leads to an efficient numerical solution. The scheme can deal with patches of arbitrary shapes and is capable of dealing with a ver...

Small Loop Antennas

Exact Solutions of Electromagnetic Fields in Both Near and Far Zones Radiated by Thin Circular-Loop Antennas: A General Representation

This paper presents an alternative vector analysis of the electromagnetic (EM) fields radiated from thin circularloop antennas of arbitrary radius a. This method, which employs the dyadic Green’s function in the derivation of the EM radiated fields, makes the analysis more general, compact, and straightforward than those two methods published recently by Werner and Overfelt. Both near and far z...