Where $k_0 = 2\pi/\lambda_0$ is the free-space wavenumber. More precisely, radiation occurs when the phase velocity $v_p$ is slightly less than $c$ (the speed of light).
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Traveling wave antennas, also known as traveling wave radiators, are a type of antenna that uses a traveling wave to radiate electromagnetic energy. These antennas are widely used in various applications, including communication systems, radar systems, and navigation systems. In this report, we will discuss the concept of traveling wave antennas, their design, and characteristics, with a focus on the work by Walter. Where $k_0 = 2\pi/\lambda_0$ is the free-space wavenumber
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