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Tags for chipless radiofrequency identification (chipless-RFID) based on chains of identical S-shaped split ring resonators (S-SRRs) are presented in this paper. The tag code is implemented by the presence or absence of resonant elements (S-SRRs) at predefined and equidistant positions. Tag reading is carried out by means of near-field coupling, by transversally displacing the chain of S-SRRs (tag)...
Differential (or balanced) microstrip lines with common-mode suppression in a controllable frequency band are implemented by periodically modulating the common-mode characteristic impedance of the line, keeping the differential-mode impedance unaltered. Due to the Bragg effect associated to periodicity, the common-mode is efficiently rejected in the vicinity of the Bragg frequency, whereas the structure...
This paper is focused on a perturbation method that allows designing dual-band impedance matching networks for applications where the frequency bands are very close. Such networks are based on resonant type metamaterial transmission lines, namely, artificial lines consisting on a host propagating medium loaded with electrically small resonators. These resonators can be tailored in order to obtain...
A dual-band rat race hybrid coupler based on artificial lines implemented by means of complementary split ring resonators (CSRRs) is presented for the first time. Contrary to other dual-band components (such as branch line hybrid couplers or power dividers) based on the composite right/left handed (CRLH) characteristics of CSRR-loaded lines, the present design approach is based on the diplexer action...
This paper is focused on the comparison between the two main categories of resonant-type metamaterial transmission lines: those based on split ring resonators (SRRs) and those based on their complementary counterparts, that is, complementary split ring resonators (CSRRs). It will be shown that both SRR- and CSRR-based metamaterial transmission lines exhibit a very similar behavior, and this analogous...
In this paper the most relevant applications derived from dispersion and impedance engineering in resonant type metamaterial transmission lines are highlighted. Essentially, this includes enhanced bandwidth components and dual-band components. Due to the small electrical size of the considered metamaterial resonators, size reduction is also obtained. We will provide some recent results obtained by...
This paper is focused on the application of open split ring resonators (OSRRs) and their dual counterparts, open complementary split ring resonators (OCSRRs), to the synthesis of composite right/left-handed transmission lines, that is, artificial lines exhibiting backward wave propagation at low frequencies and forward wave propagation at high frequencies. Due to the small dimensions of these resonators,...
A new approach using digital relays for double circuit transmission line protection is presented in this paper. The proposed technique consists of a preprocessing module based on time-frequency transforms in combination with an artificial neural network (ANN) for detecting and classifying fault events. The pre-processing module extracts distinctive features in the input signals at the relay location,...
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