Answers are grounded in this paper and cite their sources.
A new printed dual-spiral slot antenna, fully integrated with coplanar waveguide (CPW), is described. The two spiral elements are simultaneously coupled to a single feed line and produce a circular polarization. It can be operated with bi- or unidirectional patterns and would be suitable for a variety of communications applications requiring an inexpensive smaller-size antenna with a simplified feeding system, modest gain and a fairly broad beam. It could also be used as an element in active antennas, or arrays, realized entirely in coplanar form. Satisfactory radiation patterns, polarization and return loss are presented for a 3 GHz prototype.
No takes yet. Share an insight, caveat, or question.
Ibrahim et al. (2002) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: