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Two output structures constructed by multiple apertures in E-and H-planes were designed for a W-band broadband sheet beam traveling wave tube (TWT). E-plane coupler can achieve 32% relative bandwidth and perform excellent port isolation. In comparison, another output coupler built by multi-aperture in H-plane was demon-strated, which is much convenient for PCM focusing system and can be easily integrated...
A generalized modal expansion theory is presented to investigate and illustrate the physics of wave-matter interaction within arbitrary two-dimensional (2-D) bounded and unbounded electromagnetic problems. We start with the bounded case where the field excited by any sources is expanded with a complete set of biorthogonal eigenmodes. In regard to non-Hermitian or nonreciprocal problems, an auxiliary...
Recently, a new concept of rotation scanning synthetic aperture interferometric radiometer (RS-SAIR) has been receiving more and more attentions for its advantage of much simpler configuration with looser requirements of antenna elements. In this article, we investigate the imaging theory of RS-SAIR, and introduce the pseudo-polar FFT algorithm to deal with the polar u-v samples. It only involves...
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