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An electrically small passive UHF-RFID tag based on a square-shaped split ring resonator antenna is presented. An analytical formulation of the radiation properties and the chip impedance matching is provided. A tag prototype of size 31 mm × 31 mm (λ0/11 × λ0/11) is designed and fabricated. The simulated and measured results are in good agreement with the theoretical analysis and the measured read...
This paper analyzes and compares two types of transmission line metamaterials: (i) coplanar waveguide (CPW) transmission lines loaded with pairs of magnetically coupled split ring resonators (SRRs), and (ii) microstrip lines loaded with pairs of electrically coupled complementary split ring resonators (CSRRs). Both structures are described by lumped element equivalent circuit models rather different...
Microstrip lines loaded with pairs of electrically coupled complementary split ring resonators (CSRRs) are studied for the first time. For the general asymmetric case, where the line is loaded with different CSRRs at each stage (pair), the structure exhibits negative effective permittivity in the vicinity of two different frequencies, i.e., it behaves as a dual-band epsilon-negative (ENG) transmission...
This paper deals with the automated synthesis of open complementary split ring resonators (OCSRRs) using aggressive space mapping (ASM) for the first time. These open resonators are electrically small planar elements useful for the implementation of shunt LC resonators in microstrip or coplanar waveguide technology. However, their synthesis is in general complex and requires the experience of the...
This paper is focused on the study of the tunability of planar composite right/left handed (CRLH) transmission lines based on the combination of open split ring resonators (OSRRs) and open complementary split ring resonators (OCSRRs), and its application to microwave devices. The tunability is achieved by means of Barium-Stronium-Titanate (BST) thick films, which change the electrical properties of...
In this paper we report the synthesis of metamaterial transmission lines by means of aggressive space mapping (ASM). Specifically, it is demonstrated that ASM can be applied to the automated layout generation of composite right/left handed (CRLH) microstrip lines based on a combination of complementary split ring resonators (CSRRs) and series gaps. To illustrate the potentiality and accuracy of the...
In this work, it is shown that complementary spiral resonators (CSRs) etched in the ground plane of a microstrip line are useful for the implementation of band pass filters with very small dimensions and wide stop bands. By combining the CSRs with two series capacitive gaps and inductive vias, two transmission zeros arise. By properly allocating such transmission zeros at both sides of the pass band...
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