Tunable 2D electromagnetic band-gap (EBG) structures based on micro-electro-mechanical systems (MEMS) for THz frequencies

Sanz-Fernandez, J.; Goussetis, George; Cheung, Rebecca

doi:10.1109/aps.2010.5560914

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…In addition to reorienting entire elements, metamaterials can be geometrically tuned by moving conducting elements in relation to each other [38,81,[93][94][95][96][97][98][99][100][101][102][103][104][105][106][107][108]. MEMS are frequently employed to perform the mechanical movement of conducting elements for THz metamaterials [38,80,93,95,101]. When conducting elements are moved closer or further The non-Foster-loaded AMC shows greatly increased bandwidth compared to a similar varactor-loaded AMC design.…”

Section: Geometrical Tuningmentioning

confidence: 99%

“…The antenna has the advantage of compact size, low cost, and easy fabrication as well as implementation. Researchers have attained similar RF frequency tunability through a variety of other methods, such as through MEMS [22,73,79,81,93,94], tunable EBG surfaces [59,78,95,112,134,135], ferroelectric rods and films [13,115,116,122], vanadium dioxide switches [130,131], and liquid crystals [42,117,118,136]. These proposed designs exhibited varied tunable RF filter types, such as band-stop, band-pass, and notch filters.…”

Section: Tunable Filters and Antennasmentioning

confidence: 99%

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Reconfigurable and Tunable Metamaterials: A Review of the Theory and Applications

Turpin

Bossard

Morgan

et al. 2014

International Journal of Antennas and Propagation

190

118

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Metamaterials are being applied to the development and construction of many new devices throughout the electromagnetic spectrum. Limitations posed by the metamaterial operational bandwidth and losses can be effectively mitigated through the incorporation of tunable elements into the metamaterial devices. There are a wide range of approaches that have been advanced in the literature for adding reconfiguration to metamaterial devices all the way from the RF through the optical regimes, but some techniques are useful only for certain wavelength bands. A range of tuning techniques span from active circuit elements introduced into the resonant conductive metamaterial geometries to constituent materials that change electromagnetic properties under specific environmental stimuli. This paper presents a survey of the development of reconfigurable and tunable metamaterial technology as well as of the applications where such capabilities are valuable.

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Section: Geometrical Tuningmentioning

confidence: 99%

Section: Tunable Filters and Antennasmentioning

confidence: 99%

Reconfigurable and Tunable Metamaterials: A Review of the Theory and Applications

Turpin

Bossard

Morgan

et al. 2014

International Journal of Antennas and Propagation

190

118

View full text Add to dashboard Cite

show abstract

“…Integration of active devices in passive microwave structures is becoming popular due to the added features enabled through the external control for controlling the propagation and radiation properties of the microwave structure [1]- [2]. Varactor diodes, PIN diodes, FET switches and MEMS are some of the active devices commonly used to alter the properties of such microwave components.…”

Section: Introductionmentioning

confidence: 99%

Investigation on FET switch integration techniques for a tunable microwave periodic structure

Matekovits

Thalakotuna²,

Heimlich³

2012

2012 IEEE International Workshop on Antenna Technology (iWAT)

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A recently proposed tunable microwave periodic structure requires many switches to dynamically change its microwave propagation and radiation characteristics. The performance of a discrete Field Effect Transistor (FET) switch package, suitable for the structure, is investigated in two potential configurations. In one configuration, the switch is co-planar with the ground plane and in the other it is on a different surface. Measurements made on two test boards confirm that when the switches are turned "on" the switch insertion losses are not significantly different between the two configurations. However when the switches are turned "off", locating the switches on the ground plane provide better isolation between RF ports.

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“…In Refs. , varactor diodes between the metallic patches on the upper substrate of the HIS are introduced to shift the resonant frequency electronically. Unfortunately, this method not only suffers from the complicated biasing circuits, but the bulk power of the rotating magnetic ( B 1 ) field of the RF coils in MRI might expose the diodes to damage.…”

Section: Introductionmentioning

confidence: 99%

Tuning high impedance surfaces using coaxial cables for magnetic resonance imaging machines

Saleh

Solbach

Erni

et al. 2018

Int J RF Microw Comput Aided Eng

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In this article, we introduce coaxial cables to tune the resonant frequency of metamaterials, the high impedance surfaces (HISs). The proposed structure is used as tuned artificial reflector for radio frequency (RF) coils in magnetic resonance imaging (MRI) machines. In this technique, coaxial cables are connected to the pins (vias) of the HIS to extend their lengths. Circulating the current in long paths aims to increase the total inductance of the HIS to shift its resonance down in frequency. The proposed method for MRI solves the problems of using the available tuning techniques, such as the inaccurate mechanical adjustments which lead to inaccurate electromagnetic properties. Further, it solves the problem of using electronic tuning circuits such as diodes because of the bulk power used by RF coils in MRI which may expose them to damage. In this article, the transverse magnetic reflection coefficient phase at oblique incidence and the transmission coefficient (S2, 1) of the proposed tuned HIS have been investigated. The experimental results showed an obvious shift in the resonant frequency of the tuned HIS compared to the untuned surface.

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Tunable 2D electromagnetic band-gap (EBG) structures based on micro-electro-mechanical systems (MEMS) for THz frequencies

Cited by 5 publications

References 11 publications

Reconfigurable and Tunable Metamaterials: A Review of the Theory and Applications

Reconfigurable and Tunable Metamaterials: A Review of the Theory and Applications

Investigation on FET switch integration techniques for a tunable microwave periodic structure

Tuning high impedance surfaces using coaxial cables for magnetic resonance imaging machines

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