1. WEARABLE ANTENNAS: DESIGN, CONNECTIVITY AND EVALUATION MEASUREMENT TECHNIQUES
By Aris Tsolis
Supervisors: 1st Yiannis Vardaxoglou, 2nd Antonis Alexandridis, 3rd William Whittow
PhD
January November 2016

2. Wearable Antennas in modern life

3. Wearable Antennas in modern life

4. PhD thesis research novelties (Wearable Antennas Measurements)
Low-cost, lightweight (cost reduced by 2/3, ~ 15kg)
Facilitation of measurements
Good agreement with real human bodies and other phantoms
Attractive for academia, for educational purposes
Safety, repeatability, ethics, non-dynamic performance
HOCS 1
Find optimum measurement setup (Closest results to Simulations)
Prepare CNF measurements for HOCS phantom
Exclude using the HOCS phantom by using the CDP
Avoid danger of breaking the phantom and expire of liquid properties
Educational purposes – better understanding of CNF measurement technique
CDP HOCS
Evaluation
Technique Of
CNF
For WA HOCS 2
Methodology
By using
CNF
For WA HOCS performance
Less physical space, lower cost and complexity with others
Good agreement with simulations
Could be applied for whole human body phantoms
Evaluating WAs for more complex scenarios (firefighter, astronaut suit) – details in E-field, interference 3

5. 4 5 PhD thesis research novelties
(All-textile interconnecting and feeding of TLs and WAs)
User friendly
All-textile flexible connector-no rigid connectors used
Effective in terms of performance
Ease of connecting and disconnecting long with short striplines integraded on clothes (e.g. patient monitor sensors different locations)
All-textile Complementary Overlap (CO)
Stripline Interconnection method 4
Real life wearable scenario:
Sensor sending signal to patch via stripline which is radiated Off-body
CO all-textile flexible:
patch antenna can be easily connected and disconnected with long or short striplines On-body without rigid connectors
Connected 5
Disconnected

6. (Loughborough University, 01/01/13 – 30/06/2014)
1st Period of PhD
(Loughborough University, 01/01/13 – 30/06/2014)
Studied lots of papers, books
Tried to recognize what has not been done and needed to
Determined possible novelties (2/5)
1st month
Learn and practice on simulations software and measurements hardware
Simulation and measurements for novelty 1
First conference paper
Summer school attendance was really helpful
6 months
1st year
Determined all five novelties
1st year report
Preparing first journal paper (review – from literature review)
Simulation and measurements for novelties 1,2,3
Published 1st journal paper (review paper)
Submitted 2nd conference paper (novelty 1)
Finished simulations and measurements for novelties 2,3
Almost fulfilled work part Loughborough (simulations for novelty 1 finished later in Demokritos)
18 months

7. (NCSR “Demokritos”, 01/07/14 – 31/12/2015)
2nd Period of PhD
(NCSR “Demokritos”, 01/07/14 – 31/12/2015)
24 months
Submitted 3rd conference paper
Fulfilled work left from Loughborough (Simulations for novelty 1)
Started working on novelties 4,5
30 months
Simulations and measurements for novelties 4 and 5
Submitted 2nd Journal paper, one month later published and became featured article
Submitted 4th conference paper
Planned thesis contents / outline
36 months
Finished with simulations and measurements for novelty 4
Started writing thesis and finished 1st draft by the end of the 3rd year
Final measurements to enhance novelty 5 Results added on the thesis
Feedback from all supervisors (3)
Submitted thesis before VIVA after supervisors approval
Successful VIVA
Submitted final e-thesis after VIVA corrections
Submitted 3rd and 4th Journal papers (1 has been accepted)
Preparing 5th Journal paper
4th year

8. Publications in Journals
J1. A. Tsolis, A.A. Alexandridis, W.G. Whittow, J.C. Vardaxoglou, “All-textile and flexible interconnecting and feeding of striplines and wearable patch antennas”, IET, Microwaves, Antennas & Propagation (in preparation-proposal)
J2. A. Tsolis, A. Paraskevopoulos, W.G. Whittow, A.A. Alexandridis, J.C. Vardaxoglou, “ Design, Realization and Evaluation of a Liquid Hollow Torso Phantom Appropriate for Wearable Antenna Assessment”, IET, Microwaves, Antennas & Propagation (accepted)
J3. A. Paraskevopoulos, A. Tsolis, A.A. Alexandridis, J.C. Vardaxoglou, “Cylindrical Near-Field Assessment of Wearable Antennas for Body-Centric Communications”, IET, Microwaves, Antennas and Propagation, (accepted)
J4. A. Tsolis, A.A. Alexandridis, W.G. Whittow, J.C. Vardaxoglou, “Connecting wearable textile transmission lines: all- textile fabrication solutions and design techniques”, IET Electronics Letters, Vol. 51, No. 15, pp , 23rd July, 2015
Featured article: “Flexible use”
J5. A. Tsolis, W.G. Whittow, A.A. Alexandridis, J.C. Vardaxoglou, “Embroidery and related manufacturing techniques for wearable antennas: challenges and opportunities”, Electronics, Vol. 3, No. 2, pp , May 2014, Review

9. Publications in Conferences
C1. A. Tsolis, W.G. Whittow, A. Chauraya, A.A. Alexandridis, J.C. Vardaxoglou, “A calibration of a cylindrical near field test site appropriate for wearable antenna measurements on a liquid torso phantom at 2GHz”, Proc. of the 11th Loughborough Antennas & Propagation Conference (LAPC 2015), Loughborough, UK, 2-3 November 2015 C2. A. Tsolis, A.A. Alexandridis, W.G. Whittow, J.C. Vardaxoglou, “Investigation of textile striplines connectivity for feeding and connecting wearable antennas”, Proc. of the 9th European Conference on Antennas & Propagation (EuCAP 2015), Lisbon, Portugal, April 2015 C3. A. Tsolis, W.G. Whittow, A. Chauraya, A.A. Alexandridis, J.C. Vardaxoglou, “Evaluation of a realized hollow torso phantom for wearable antenna measurements”, Proc. of the 10thLoughborough Antennas & Propagation Conference (LAPC 2014), Loughborough, UK, November 2014 C4. A. Tsolis, W.G. Whittow, A.A. Alexandridis, J.C. Vardaxoglou, "Evaluation of a Human Body Phantom for Wearable Antenna Measurements at the 5.8GHz Band", Proc. of the Loughborough Antennas & Propagation Conference, (LAPC 2013), Loughborough, UK, November 2013

10. Συμβουλές για την ολοκλήρωση του διδακτορικού...
(από την προσωπική εμπειρία)
Συνεχές διαβασμα
Καθημερινό καλό πλάνο και έλεγχος του, σε συννενόηση με τους επιβλέποντες
Αισιοδοξία, υπομονή και επιμονή
Η προσωπική υγεία ειναι το πιο σημαντικό πράγμα
Δραστηριότητες πέραν του διαδακτορικού ειναι απαραίτητες

11. Ευχαριστώ για την προσοχή σας. Ερωτήσεις?