Design and implementation of reconfigurable transmitarray unit cells employing the element rotation method by microfluidics

Download

index.pdf

Date

2014

Author

Erdil, Emre

Metadata

Show full item record

Item Usage Stats

181
views

109
downloads

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 microfluidic approach, a unit cell comprising a double layer nested ring-split ring is realized as microfluidic channels embedded in Polydimethylsiloxane using soft lithography techniques and bonded to a glass substrate. Conductive regions of the rings are formed by injecting a liquid metal (an alloy of Ga, In, and Sn), whereas the split region is the air gap in the inner ring. Movement of the liquid metal together with the split around the ring realizes the rotation of the unit cell around its axis, which controls the phase of the transmitted field through the unit cell and provides 360 linear phase shift range. A circularly polarized unit cell is designed by using periodic boundary conditions to implement the infinite array approach and satisfies the design conditions at 8.8 GHz. To realize the rotation, unit cell prototypes at different split positions are fabricated in the facilities of METU and the proposed concept is verified by the measurements using the waveguide simulator method, within the frequency range of 810 GHz. The simulation and measurement results show a fair agreement, illustrating the viability of the approach to be used in reconfigurable reflectarrays and transmitarrays.

Subject Keywords

Microfluidics., Transmitarray.

URI

http://etd.lib.metu.edu.tr/upload/12617916/index.pdf
https://hdl.handle.net/11511/23952

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

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...
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...
Reconfigurable Nested Ring-Split Ring Transmitarray Unit Cell Employing the Element Rotation Method by Microfluidics Erdil, Emre; TOPALLI, KAĞAN; Esmaeilzad, Nasim S.; Zorlu, Ozge; Külah, Haluk; Aydın Çivi, Hatice Özlem (2015-03-01) 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 ...
Design of pattern reconfigurable antenna employing RF-MEMS switches Gök, Çağlar; Alatan, Lale; Department of Electrical and Electronics Engineering (2022-8-17) In this thesis, the design, simulations, fabrication and measurements of reconfigurable antennas for use in 5G Massive MIMO systems are presented. 26 GHz is chosen as the operating frequency and RF-MEMS switches are used as control elements for pattern reconfiguration. As a first step, a patch antenna is designed based on the excitation of different operation modes of different resonators. A circular patch in the center and a ring resonator structure around it are used to create different radiation patterns...
Design and fabrication of a high performance resonant MEMS temperature sensor Kose, Talha; Azgın, Kıvanç; Akın, Tayfun (IOP Publishing, 2016-04-01) This paper presents a high performance MEMS temperature sensor comprised of a double-ended-tuning-fork (DETF) resonator and strain-amplifying beam structure. The temperature detection is based on the 'thermal strain induced frequency variations' of the DETF resonator. The major source of thermal strain leading to the frequency shifts is the difference in thermal expansion coefficients of the substrate and the device layers of the fabricated structures. By selecting the substrate as glass and the device laye...

Citation Formats

E. Erdil, “Design and implementation of reconfigurable transmitarray unit cells employing the element rotation method by microfluidics,” Ph.D. - Doctoral Program, Middle East Technical University, 2014.