Prof. Stavros Koulouridis
Electrical and Computer Engineering, University of Patras, Greece
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Academic Career Length
27Years (2000-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications4 December 2006 in IEEE Transactions on Microwave Theory and Techniques
Journal Article
Stavros KoulouridisGKGullu Kiziltas
Gullu Kiziltas
YZYijun Zhou
Yijun Zhou
DHDerek J. Hansford
Derek J. Hansford
JVJohn L. Volakis
John L. Volakis
We present a novel technique to fabricate conformal and pliable substrates for microwave applications including systems-on-package. The produced materials are fabricated by combining ceramic powders with polymers to generate a high-contrast substrate that is concurrently pliable (bendable). Several such polymer-ceramic substrates are fabricated and used to examine the performance of a patch antenna and a coupled line filter. This paper presents the substrate mixing method while measurements are given to evaluate the loss performance of the substrates. Overall, the fabricated composites lead to flexible substrates with a permittivity of up to epsivr=20 and sufficiently low loss
16 July 2019 in IEEE Transactions on Antennas and Propagation
Journal Article
SBSofia Bakogianni
Sofia BakogianniStavros KoulouridisAn arm-implantable rectenna, supported by a compact planar inverted F-antenna (PIFA) and a rectifier, is proposed for wireless data telemetry and power transfer in the Medical Device Radiocommunications Service (401-406 MHz) and Industrial, Scientific and Medical (902.8-928 MHz) bands. The rectifier is integrated into the system by using the antenna’s ground plane delivering, thus, a robust solution for the implanted devices. Each development stage is theoretically analyzed first and then experimentally tested. The antenna size is 16 x 14 x 1.27 mm3. The slit/slot loading techniques applied onto the radiator offer the antenna size reduction and the dual-band operation. PIFA’s resonance stability is shown and its radiation and safety responses are addressed. Further, an arm-attached matching layer is proposed to enhance the wireless power link. Then, an analysis of rectifier circuits is conducted in order to obtain optimum conversion efficiency at low input powers. By following an attentive design process, the final system (rectenna) is built and tested in whole; the measurements verify our approach.
31 December 2020 in IEEE Open Journal of Antennas and Propagation
Journal Article
Achilles D. Boursianis
Maria PapadopoulouJPJuliano Pierezan
Juliano PierezanVMViviana C. Mariani
Viviana C. Mariani
Leandro dos Santos Coelho
Sotirios K. Goudos +2
Radio frequency energy harvesting has attracted considerable interest as a technique of enabling self-powered wireless networks. This technique faces several challenges, such as the receiving and the rectifying modules of a rectenna system. Multiband antennas provide several comparative advantages against the goal of maximizing the amount of energy harvesting. In this work, we present a multiband microstrip patch antenna with three slits operating in the LoRaWAN (Long Range Wide Area Network) and the cellular (GSM-1800 and UMTS) communication frequency bands. A feasible solution of the antenna is obtained by the application of a recently introduced nature-inspired optimization technique, namely the Coyote Optimization Algorithm. The proposed antenna operates satisfactorily in the LoRaWAN (Long Range Wide Area Network) and the cellular (GSM-1800 and UMTS) communication frequency bands. Measured results of the proposed antenna exhibit an acceptable performance (multiband frequency operation, maximum gain of 3.94 dBi, broadside operation) and demonstrate features of operation, which make it a strong candidate for various RF energy harvesting applications.
1 June 2015 in IEEE Antennas and Wireless Propagation Letters
Journal Article
SBSofia Bakogianni
Sofia BakogianniStavros KoulouridisA novel implantable planar dipole antenna for operation in the Medical Device Radiocommunications Services band (401-406 MHz) is proposed. A basic skin-implantable antenna model is initially developed, and then a prototype is fabricated. The dipole antenna exhibits an extremely thin profile and a very small aperture size; antenna physical volume is approximately 18.1 mm 3. Effective size reduction is achieved by optimally canceling its inherent high capacitance through L-shaped reactive loading sections within the antenna structure. As demonstrated, the applied design methodology facilitates planar antenna miniaturization with adequate radiation response (gain, radiation pattern shape, and specific absorption rate). A liquid skin medium is employed to experimentally validate the antenna. Measured and simulated results are in good agreement.
12 March 2007 in IEEE Transactions on Antennas and Propagation
Journal Article
Stavros KoulouridisDPDimitris Psychoudakis
Dimitris Psychoudakis
JVJohn L. Volakis
John L. Volakis
There is growing interest for small antennas that concurrently have higher functionality and operability. Multiobjective optimization is an important tool in the design of such antennas since conflicting goals such as higher gain, increased bandwidth, and size reduction must be addressed simultaneously. In this paper, we present a novel optimization algorithm which permits full volumetric antenna design by combining genetic algorithms with a fast hybrid finite element-boundary integral method. To our knowledge, this is the first time that a full three dimensional antenna design is pursued using concurrent shape, size, metallization as well as dielectric and magnetic material volume optimization. In comparison to previous optimization pursuits, our approach employs a wide-frequency sweep using a single geometry model, thus, enhancing speed, along with several discrete material choices for realizable optimized designs. The developed algorithm can be interpreted as a three dimensional Pareto optimization scheme and provides the designer with several choices among the best antennas, according to design goals and constraints. The final designs are associated with very thin (~0.01lambda) material substrates and yield as much as 15% bandwidth using a 0.1lambda--0.4lambda aperture subject to various gain and bandwidth requirements
21 October 2020 in IEEE Access
Journal Article
We introduce a novel RF to DC wireless power transmission implantable rectenna system at Industrial, Scientific and Medical bands (ISM 902.8-928 MHz). An embedded circular antenna receives the externally emitted energy from a patch antenna and converts it to DC power by a rectifying circuit. The system is associated with a metallic reflector which is placed behind the human body enhancing the reception. The rectifying circuit efficiency and the total system’s efficiency are determined for different external antenna to human body distances and various embedded depths with or without the reflector. Experimental results, obtained in a realistic environment, validate the predicted performance and provide an initial evaluation of the transmission link. Porcine tissue and bovine tissue are both used during the measurements and results are compared against simulations.
About Me
Stavros Koulouridis received the diploma degree in electrical and computer engineering and the Ph.D. degree in microwave engineering from the National Technical University of Athens, Greece in 1999 and 2003, respectively. From 2004 to 2008, he worked as a postdoctoral researcher with the Electroscience Laboratory, The Ohio State University, Columbus, OH, USA. He joined the Electrical and Computer Engineering Department, University of Patras, Greece, in March 2009. Since March 2020, he has been an associate professor. Since October 2020, he has been the director of the RF, Microwave, and Mobile Communications Laboratory. His research interests include antenna and microwave devices design, development, and fabrication of novel materials; microwave applications in medicine; and electromagnetic optimization techniques. He was the general chair of the International Workshop in Antennas Technology (IWAT) 2017. From 2010 to 2019, he served with the Technical Program Committee for IEEE Antennas and Propagation Society (AP-S) International Symposium. Since 2015, he has been serving with the Technical Program Committee of the European Conference of Antennas and Propagation (EUCAP) as a meta-reviewer. He is a topical advisory panel member of electronics and editorial board member of Telecom, Open Access Journals from MDPI. He is an associate editor of IEEE AWPL and IEEE J-ERM.