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The authors discuss two types of exciting modes in a rectangular-to-radial waveguide transformer for radial line slot antennas (RLSAs). One is the rotating-mode gene a crossed slot in a radial waveguide. The measured ripple of the amplitude is 3.0 dB in the φ-direction at 5.95 GHz and the bandwidth below 6 dB is 7.0% in the 5.8 GHz band. The other is the coaxial mode; which is proposed in this paper. The calculated ripple of the amplitude in the φ-direction is about 1.2 dB in the 12 GHz band.