Right‐ and left‐handed transmission line resonators and filters for dual‐band applications

Kapitanova, Polina; Kholodnyak, Dmitry; Humbla, Stefan; Perrone, R.; Mueller, Jens; Hein, Matthias; Vendik, I.

doi:10.1002/mop.24117

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…Dual‐band responses have been typically achieved by proper coupling of a number of single‐band devices [1, 2], by using composite structure [3], by coupling of a pair of degenerate modes that propagate in a single structure [4, 5], or, recently, by using artificial electromagnetic materials [6, 7]. However, the first and second approach often result in resonators of relatively large size or complicated fabrication process, the third one exhibits perpendicularly positioned ports which limits the design flexibility and decreases the integration potential of the circuit, whereas the fourth approach lacks straightforward synthesis procedures and inherently suffers from relatively large insertion losses.…”

Section: Introductionmentioning

confidence: 99%

Dual‐band bandpass filters based on dual‐mode hilbert fractal resonator

Crnojević‐Bengin¹,

Zemlyakov²,

Janković³

et al. 2013

Micro & Optical Tech Letters

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We propose a compact planar dual‐mode resonator based on a Hilbert fractal curve that operates at two arbitrary frequencies. The resonator is used to design two types of dual‐band bandpass filters for WLAN applications, which exhibit a good trade‐off between compact size and high performances, with the overall sizes ranging from 0.22 × 0.21 to 0.44 × 0.1 guided wavelengths and measured insertion losses from 0.38 to 2.5 dB. At the same time, the fabrication of filters is quite simple and requires no modifications in the ground plane or use of vias. In addition, the proposed resonator is used to design single‐band filters as well. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1440–1443, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27667

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Section: Introductionmentioning

confidence: 99%

Dual‐band bandpass filters based on dual‐mode hilbert fractal resonator

Crnojević‐Bengin¹,

Zemlyakov²,

Janković³

et al. 2013

Micro & Optical Tech Letters

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“…For TLs exhibiting a linear dispersion characteristic, the resonant frequencies are integer multiples of the fundamental mode. Using a combination of RH and LH TLs allows designing resonators and filters with highly suppressed spurious responses [9][10][11][12][13]. For many practical applications it is necessary to reject the higher-order harmonics.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence, filters built from TL resonators exhibit additional passbands at higher frequencies. Moreover, dual-band resonators and filters for two arbitrary resonant frequencies and with suppressed higher harmonic response can be designed using different dispersion characteristics of the RH and LH TLs [12,13]. A common way to suppress the higher harmonics is the use of stepped impedance resonators (SIRs) for the filter design [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…They are known as metamaterial TLs or left-handed (LH) TLs [7, 8]. Using a combination of RH and LH TLs allows designing resonators and filters with highly suppressed spurious responses [9–13]. Moreover, dual-band resonators and filters for two arbitrary resonant frequencies and with suppressed higher harmonic response can be designed using different dispersion characteristics of the RH and LH TLs [12, 13].…”

Section: Introductionmentioning

confidence: 99%

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Tunable microwave devices based on left/right-handed transmission line sections in multilayer implementation

Kapitanova

Kholodnyak

Humbla

et al. 2009

Int. J. Microw. Wireless Technol.

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Metamaterial transmission lines can be realized as a combination of right-and left-handed transmission line (TL) sections exhibiting positive and negative dispersion. This approach gives additional degrees of freedom for improving the performance of microwave devices. Artificial right-and left-handed sections, which are based on lumped-element unit cells consisting of inductance and capacitances (LC-cells), are used. This makes it possible to decrease dimensions of the devices drastically. Furthermore, using variable capacitors in LC-cells allows designing tunable devices. This paper presents the results of design, numerical simulation, and experimental investigation of a tunable rat-race ring and free-of-spurious response dualband filter manufactured as integrated ceramic multilayer circuits based on low-temperature co-fired ceramics. Commercial semiconductor varactors have been used as tunable components.

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Microwave Metamaterial Circuits

Vendik

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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Electromagnetic metamaterials are usually defined as artificial effectively homogeneous structures with specific properties, that cannot be observed in natural materials. Different approaches are used for a description of the fundamental electromagnetic properties of metamaterials and the practical realization of these materials as well. Among them, the transmission line (TL) approach gives an efficient design tool for microwave applications. A conventional TL with the positive phase velocity behaves as a right‐handed transmission line (RH TL). An artificial RH TL is formed as a ladder network of capacitors connected in shunt and series inductors. The dual transmission line is designed as a ladder network of inductors connected in shunt and series capacitors. This line has the negative phase velocity and is referred to as the left‐handed transmission line (LH TL). A backward wave propagates along the LH TL, which can be considered as the one‐dimensional metamaterial. A more general model of an LH TL is the composite right/left handed (CRLH) structure. Many interesting features can be observed when a combination of RH TL and LH TL is used. The most important feature of the LH and RH TLs is that their dispersion characteristics are described by different equations. That can be used for many beneficial applications. Different combinations of LH and RH TLs are used for a design of miniature microwave devices with improved performance and enlarged functionality. Among them are microwave resonators and filters, microwave power divider/combiners, and microwave phase shifters. Multiband devices and tunable and reconfigurable microwave circuits are also under consideration.

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Right‐ and left‐handed transmission line resonators and filters for dual‐band applications

Cited by 8 publications

References 11 publications

Dual‐band bandpass filters based on dual‐mode hilbert fractal resonator

Dual‐band bandpass filters based on dual‐mode hilbert fractal resonator

Tunable microwave devices based on left/right-handed transmission line sections in multilayer implementation

Microwave Metamaterial Circuits

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