Omnidirectional circularly polarized antennas – a small antenna perspective

The paper discusses recent developments and challenges in the design of small omnidirectional
circularly-polarized (CP) antennas. Although omnidirectional CP coverage is easily achievable using
antenna arrays, it is just recently that small and low-cost antennas delivered this functionality.
The paper addresses practical design problems for these antennas, not reported in previous publications.
This includes selection of the omnidirectional plane relative to the ground plane and measurement challenges. Future perspectives on how these antennas can provide electronically steerable beams are investigated using simulated results.

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