In this paper, a novel design of bandpass waveguide filters, using complementary split ring resonators is proposed. Resonators are implemented as inserts in a form of metal plates, with properly shaped slots, in the transverse planes of the rectangular waveguide. Filter response has been investigated for various parameters of the resonator and its position. Simple design of dual-band filter is introduced, using resonators attached to the top and bottom waveguide wall. Also, second-order dual-band filter is proposed.
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