Theory of a class of planar frequency-independent omnidirectional traveling-wave antennas

The theory for a new class of planar frequency-independent omnidirectional antenna has been developed and found to be consistent with measured data, with better agreement than many of those obtained by brute-force numerical computation. More importantly, the theory is useful for design and synthesis because of its simple closed-form solution, which has direct and close relevance to the physical parameters and performance of the planar frequency-independent omnidirectional antenna. A building block for the theory is that for the annular slots, which has some errors in the literature. These errors in the equations and figures were also discussed and corrected in this paper