Artificial Transmission Lines

Martín, Ferrán; Bonache, Jordi; Durán‐Sindreu, Miguel; Naqui, Jordi; Paredes, Ferran; Zamora, Gerard

doi:10.1002/047134608x.w8151

Cited by 5 publications

(6 citation statements)

References 113 publications

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“…1a). From this response (or by means of expressions 1-3), we extract the variables of the coarse model corresponding to the first iteration x c (1) . Then, we compare such values with the target (x c * ) and this gives the first error function (10).…”

Section: First Asm: Determination Of the Optimum Schematicmentioning

confidence: 99%

“…Once the matrix B (1) is known, the fine model parameters of the following iteration can be derived from (11), and the process is iterated until convergence is obtained.…”

Section: First Asm: Determination Of the Optimum Schematicmentioning

confidence: 99%

“…Owing to the slow-wave behavior of these lines, the wavelength is also small, as compared to ordinary lines, and hence the circuit size can be significantly reduced (see the recent review on artificial transmission lines [1], that includes slow-wave transmission lines). Typically, slow-wave transmission lines are implemented by periodically loading a host line with shunt connected capacitors, either lumped or semi-lumped (e.g., patch capacitors).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of slow-wave structures based on capacitive-loaded lines through aggressive space mapping (ASM)

Orellana

Selga

Sans

et al. 2015

Int J RF and Microwave Comp Aid Eng

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This paper is focused on the automated synthesis of slow-wave structures based on microstrip lines loaded with patch capacitors. Thanks to the presence of the shunt capacitors, the effective capacitance of the line is enhanced, and the phase velocity of the structure can be made significantly smaller than the one of the unloaded line. The target is to achieve the layout of the slow-wave structure able to provide the required slow-wave ratio, characteristic (Bloch) impedance and electrical length (i.e., the usual specifications in the design of slow-wave transmission lines). To this end, a two-step synthesis method, based on the aggressive space mapping (ASM) algorithm, is proposed for the first time. Through the first ASM algorithm, the circuit schematic providing the target specifications is determined. Then, the second ASM optimizer is used to generate the layout of the structure. In order to illustrate the potential of the proposed synthesis method, three application examples are successfully reported. The two-step ASM algorithm is able to provide the layout of the considered structures from the required specifications, without the need of an external aid in the process.

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Section: First Asm: Determination Of the Optimum Schematicmentioning

confidence: 99%

“…Once the matrix B (1) is known, the fine model parameters of the following iteration can be derived from (11), and the process is iterated until convergence is obtained.…”

Section: First Asm: Determination Of the Optimum Schematicmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of slow-wave structures based on capacitive-loaded lines through aggressive space mapping (ASM)

Orellana

Selga

Sans

et al. 2015

Int J RF and Microwave Comp Aid Eng

Self Cite

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“…TL metamaterials are 1-D metamaterials comprising of the host TL loaded with reactive elements (e.g., capacitances and inductances) and/or resonators. TL metamaterials or metamaterial TLs can also be considered as a type of artificial TL [5]. Arguably, the most relevant characteristic of metamaterial TLs compared with conventional TLs is the enablement of further controllability with respect to the main line parameters (i.e., the phase constant or phase shift of the transmission line) and the characteristic impedance.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Survey of “Metamaterial Transmission-Line Based Antennas: Design, Challenges, and Applications”

et al. 2020

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In this review paper, a comprehensive study on the concept, theory, and applications of composite right/left-handed transmission lines (CRLH-TLs) by considering their use in antenna system designs have been provided. It is shown that CRLH-TLs with negative permittivity and negative permeability have unique properties that do not occur naturally. Therefore, they are referred to as artificial structures called "metamaterials". These artificial structures include series left-handed (LH) capacitances , shunt LH inductances , series right-handed (RH) inductances , and shunt RH capacitances that are realized by slots or interdigital capacitors, stubs or via-holes, unwanted current flowing on the surface, and gap distance between the surface and ground-plane, respectively. In the most cases, it is also shown that structures based on CRLH metamaterial-TLs are superior than their conventional alternatives, since they have smaller dimensions, lower-profile, wider bandwidth, better radiation patterns, higher gain and efficiency, which make them easier and more cost-effective to manufacture and mass produce. Hence, a broad range of metamaterial-based design possibilities are introduced to highlight the improvement of the performance parameters that are rare and not often discussed in available literature. Therefore, this survey provides a wide overview of key early-stage concepts of metematerial-based designs as a thorough reference for specialist antennas and microwave circuits designers. To analyze the critical features of metamaterial theory and concept, several examples are used. Comparisons on the basis of physical size, bandwidth, materials, gain, efficiency, and radiation patterns are made for all the examples that are based on CRLH metamaterial-TLs. As revealed in all the metematerial design examples, footprint area decrement is an important issue of study that have a strong impact for the enlargement of the next generation wireless communication systems.

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“…Nevertheless, the confinement of these waves depends directly on the materials used for the implementation of the coupler and the surrounding media, resulting in a poor controllability of the field decay with distance. Conversely, it is well established that metamaterial wave-guiding structures131415161718 (i.e., periodic structures with the period much smaller than the wavelength) and metasurfaces offer high controllability of the field distribution regardless of the materials composing the structure19202122. However, to the author’s knowledge such controllability has not been exploited in order to obtain a specific field confinement region optimized for a certain application.…”

mentioning

confidence: 99%

Controlling the Electromagnetic Field Confinement with Metamaterials

Bonache

Zamora

Paredes

et al. 2016

Sci Rep

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The definition of a precise illumination region is essential in many applications where the electromagnetic field should be confined in some specific volume. By using conventional structures, it is difficult to achieve an adequate confinement distance (or volume) with negligible levels of radiation leakage beyond it. Although metamaterial structures and metasurfaces are well-known to provide high controllability of their electromagnetic properties, this feature has not yet been applied to solve this problem. We present a method of electromagnetic field confinement based on the generation of evanescent waves by means of metamaterial structures. With this method, the confinement volume can be controlled, namely, it is possible to define a large area with an intense field without radiation leakage. A prototype working in the microwave region has been implemented, and very good agreement between the measurements and the theoretical prediction of field distribution has been obtained.

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Artificial Transmission Lines

Cited by 5 publications

References 113 publications

Synthesis of slow-wave structures based on capacitive-loaded lines through aggressive space mapping (ASM)

Synthesis of slow-wave structures based on capacitive-loaded lines through aggressive space mapping (ASM)

A Comprehensive Survey of “Metamaterial Transmission-Line Based Antennas: Design, Challenges, and Applications”

Controlling the Electromagnetic Field Confinement with Metamaterials

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