Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Open Access Guideline
Open Access Guideline
Postgraduate Thesis Guideline
Postgraduate Thesis Guideline
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
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
228
views
145
downloads
Cite This
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 810 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
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
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.