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In this paper, the use of 'composite right/left handed' (CRLH) devices in a first-order recursive active filter topology is proposed. The intention of the design with these CRLH devices is to obtain a circuit with a dual-band filtering behaviour at two arbitrary frequencies. Dual-band CRLH branch-lines in the input and output ports allow obtaining well input/output matching. On the other hand, a CRLH...
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