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Unique properties exhibited by metamaterial transmission lines have been previously used to design a large number of dual-band microwave passive devices, but not active ones. In this paper, a novel dual-band active filter scheme based on composite right/left-handed transmission lines is proposed. The inclusion of these types of lines as feedback sections in a first-order recursive topology can be...
In this paper the use of dual-composite right/left hand (D-CRLH) transmission lines is proposed for the design of diplexers. The D-CRLH diplexers present advantages over conventional diplexers such as smaller size. The design procedure and the design equations are presented in this paper. The non-linear phase response of a D- CRLH transmission line has been used to design arbitrary diplexers. An example...
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...
In this paper, CRLH TL based antennas and microstrip patches concepts are merged to design multi-frequency antennas. The proposed antenna works at four different frequencies with non-whole ratio between them. This is possible by using CRLH and RH TLs in the same structure. Furthermore, the gain is higher than 5.7 dB and the radiation pattern is similar to the fundamental one of a conventional patch...
In this paper we propose the use of composite right/left hand (CRLH) transmission lines in ring antennas. This type of antenna presents advantages over conventional patches such as larger gain or radiation and efficiency and what it is more, the fact that the fundamental mode is the zero one. A CRLH transmission line consists of a conventional transmission line, or a right-handed transmission line,...
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