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Superluminal waveguides periodically loaded with non-Foster circuits are investigated. Such systems are shown to have right half plane poles for the equivalent two-port scattering parameters for practical values of waveguide lengths consisting of many unit cells, and hence, they are unstable.
Transmission lines periodically loaded with non-Foster circuits have been shown to have superluminal propagation in the prior literature. They were proposed for applications such as broadband leaky-wave antennas and true-time-delay lines for series feeds of antenna arrays. This letter presents results of an investigation on superluminal waveguides with periodic non-Foster loads. Such waveguides are...
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