Abstract
Narrow-band waveguide filters are widely employed in the output multiplexer (OMUX) for satellite payloads. Among different available filter technologies for realization of an OMUX, dual-mode waveguide technology is the best choice in terms of compact dimensions. In this paper, three structure of these filters are presented for a design example of a narrow-band filter used for OMUX. The first structure is the conventional dual-mode architecture based on circular waveguide by exploiting two degenerate TE modes with orthogonal polarizations. The second structure is based on the TM dual-mode cavity, such a cavity employs both resonant and nonresonanting modes. Finally, the third structure is a new dual-mode architecture based on the circular cavity with rotated slots, where the cavity exploits TE and TM resonant modes. In this manner, the single cavity provides two poles and single transmission zeros, and is at the same time very compact in the longitudinal direction. Simulation and experimental results of a two-cavity filter with four poles and two transmission zeros demonstrate the feasibility of the approach.
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