Reconfigurable Nested Ring-Split Ring Transmitarray Unit Cell Employing the Element Rotation Method by Microfluidics

Download

index.pdf

Date

2015-03-01

Author

Erdil, Emre
TOPALLI, KAĞAN
Esmaeilzad, Nasim S.
Zorlu, Ozge
Külah, Haluk
Aydın Çivi, Hatice Özlem

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

208
views

0
downloads

A continuously tunable, circularly polarized X-band microfluidic transmitarray unit cell employing the element rotation method is designed and fabricated. The unit cell comprises a double layer nested ringsplit ring structure realized as microfluidic channels embedded in Polydimethylsiloxane (PDMS) using soft lithography techniques. Conductive regions of the rings are formed by injecting a liquid metal (an alloy of Ga, In, and Sn), whereas the split region is air. Movement of the liquid metal together with the split around the ring provides 360 linear phase shift range in the transmitted field through the unit cell. A circularly polarized unit cell is designed to operate at 8.8 GHz, satisfying the necessary phase shifting conditions provided by the element rotation method. Unit cell prototypes are fabricated and the proposed concept is verified by the measurements using waveguide simulator method, within the frequency range of 8-10 GHz. The agreement between the simulation and measurement results is satisfactory, illustrating the viability of the approach to be used in reconfigurable antennas and antenna arrays.

Subject Keywords

Beam steering, Circularly polarized, Element rotation method, Lens array, Liquid metal, Microfluidics, Reconfigurable, Split ring, Transmitarray

URI

https://hdl.handle.net/11511/35098

Journal

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION

DOI

https://doi.org/10.1109/tap.2014.2387424

Collections

Department of Electrical and Electronics Engineering, Article

Suggestions

OpenMETU
Core

A Reconfigurable Microfluidic Transmitarray Unit Cell Erdil, Emre; Topalli, Kagan; Zorlu, Ozge; Toral, Taylan; YILDIRIM, ENDER; KÜLAH, HALUK; Aydın Çivi, Hatice Özlem (2013-04-12) This paper presents a novel microfluidics based approach to develop a reconfigurable circularly polarized transmitarray unit cell. The unit cell comprises double layer nested split ring slots formed as microfluidic channels that can be filled by fluids. Split regions in the slots are realized by injecting liquid metal into the channels. Beam steering is obtained by implementing rotational phase shifting via manipulating the liquid metal in the slots. X-band unit cell prototypes are fabricated on glass subst...
A Reconfigurable Nested Ring-Split Ring Transmitarray Unit Cell by Microfluidic Technology Erdil, Emre; Topalli, Kagan; Esmaeilzad, Nasim Seyedpour; Zorlu, Ozge; Külah, Haluk; Aydın Çivi, Hatice Özlem (2014-04-11) This paper presents a reconfigurable circularly polarized transmitarray unit cell by microfluidic technology. The unit cell comprises double layer nested ring-split rings formed as microfluidic channels in the Polydimethylsiloxane (PDMS) material using soft lithography techniques. In this structure, only the inner ring has a split region and this region is realized by leaving a gap in the channel filled by an injected liquid metal whereas the outer channel is filled by the liquid metal. Transmission phase o...
Microfluidic Reconfigurable Nested Split Ring-Regular Ring Transmitarray Unit Cell Erdil, Emre; Topalli, Kagan; Esmaeilzad, Nasim Seyedpour; Zorlu, Ozge; Külah, Haluk; Aydın Çivi, Hatice Özlem (2014-08-23) A reconfigurable, circularly polarized transmitarray unit cell consisting of double layer nested split ring-regular ring formed as microfluidic channels inside Polydimethylsiloxane (PDMS) is designed and fabricated. The operation of the unit cell is based on the element rotation method. The liquid metal is injected into the channels and it forms the conductive part in the structures whereas the split region in the outer ring is air. The movement of the liquid metal together with the split around the outer r...
Calculation of the Dielectric Constant of a Ferroelectric Liquid Crystal From a Mean Field Model YURTSEVEN, HASAN HAMİT; Yurtseven, Hasan Hamit (2011-01-01) The static dielectric constant epsilon(perpendicular to) of the ferroelectric liquid crystal 4-(3-methyl-2-chlorobutanoyloxy)-4'--heptyloxybiphenyl (A7) with high spontaneous polarization is calculated as a function of temperature using a mean field model. This calculation is performed close to the smectic A-isotropic liquid (SmA-I) transition for pure optically active compound (T-c = 81.6 degrees C). For this calculation of epsilon(perpendicular to), the free energy of the SmA phase is expanded in terms of...
Design and implementation of reconfigurable transmitarray unit cells employing the element rotation method by microfluidics Erdil, Emre; Aydın Çivi, Hatice Özlem; Topallı, Kağan; Department of Electrical and Electronics Engineering (2014) This thesis presents design, fabrication and measurement of a novel, continuously tunable, circularly polarized X-band microfluidic transmitarray unit cell. To the author’s knowledge, this is the first study in the literature where a microfluidics approach is used to tune the phase of the transmitted field through the unit cell by the element rotation method. Furthermore, the generalized transmitarray design conditions necessary to utilize the element rotation method are derived. To implement the novel micr...

Citation Formats

E. Erdil, K. TOPALLI, N. S. Esmaeilzad, O. Zorlu, H. Külah, and H. Ö. Aydın Çivi, “Reconfigurable Nested Ring-Split Ring Transmitarray Unit Cell Employing the Element Rotation Method by Microfluidics,” IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, pp. 1164–1169, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35098.