MOCAST 2019: Modern Circuits and Systems Technologies on Communications

A special issue of Technologies (ISSN 2227-7080).

Deadline for manuscript submissions: closed (20 February 2020) | Viewed by 18808

Special Issue Editors


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Guest Editor
Department of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: antenna design; microwave components design; wireless communications; evolutionary algorithms; machine learning
Special Issues, Collections and Topics in MDPI journals

grade E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: wireless communications; wireless power transfer and applications; optical wireless communications; communications for biomedical engineering; wireless security
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The 8th International Conference on Modern Circuit and System Technologies on Electronics and Communications (MOCAST 2019) will take place in Thessaloniki, Greece from May 13 to 15, 2019. The MOCAST technical program includes all aspects of communications and network technologies from antenna design, propagation modeling, wireless communications, network systems, and applications. This Special Issue aims at publishing extended versions of top-ranked papers in the area of communications from the conference. MOCAST is technically sponsored by IEEE. Potential topics include but are not limited to the following:

  • Antenna design;
  • Propagation;
  • Communication systems;
  • Wireless communications;
  • Network systems.

Prof. Sotirios Goudos
Prof. George K. Karagiannidis
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Technologies is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • antenna design
  • propagation
  • wireless communications
  • network systems

Published Papers (4 papers)

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Research

13 pages, 3765 KiB  
Article
Use Ultra-Wideband Discone Rectenna for Broadband RF Energy Harvesting Applications
by Manolis G. Tampouratzis, Demosthenes Vouyioukas, Dimitrios Stratakis and Traianos Yioultsis
Technologies 2020, 8(2), 21; https://doi.org/10.3390/technologies8020021 - 23 Apr 2020
Cited by 13 | Viewed by 6191
Abstract
In this study, a broadband Radio Frequency (RF) energy harvester implementation is presented. The system uses a broadband discone antenna, which can operate efficiently in a broad frequency spectrum, including LTE, DCS 1800 and UMTS 2100 cellular frequency bands. The system is able [...] Read more.
In this study, a broadband Radio Frequency (RF) energy harvester implementation is presented. The system uses a broadband discone antenna, which can operate efficiently in a broad frequency spectrum, including LTE, DCS 1800 and UMTS 2100 cellular frequency bands. The system is able to harvest energy from various electromagnetic field sources, thus has the potential to efficiently charge a storage energy element in a short time. The prototype broadband RF energy harvester was tested in the laboratory and also in a typical urban environment. Full article
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11 pages, 3355 KiB  
Article
Demonstration of Reconfigurable BPFs with Wide Tuning Bandwidth Range Using 3λ/4 Open- and λ/2 Short- Ended Stubs
by Salman Arain, Abdul Quddious, Symeon Nikolaou and Photos Vryonides
Technologies 2020, 8(1), 14; https://doi.org/10.3390/technologies8010014 - 03 Feb 2020
Cited by 1 | Viewed by 3476
Abstract
In this paper, two implementations of reconfigurable bandwidth bandpass filters (BPFs) are demonstrated both operating at a fixed center frequency of 2.4 GHz. The proposed reconfigurable bandwidth filters are based on a square ring resonator loaded with λg/4 open-ended stubs that [...] Read more.
In this paper, two implementations of reconfigurable bandwidth bandpass filters (BPFs) are demonstrated both operating at a fixed center frequency of 2.4 GHz. The proposed reconfigurable bandwidth filters are based on a square ring resonator loaded with λg/4 open-ended stubs that are permanently connected to the ring and converted to either 3λg/4 open-ended stubs or λg/2 short-ended stubs by means of positive-intrinsic-negative(PIN) diodes to implement two reconfigurable bandwidth states for each case. Due to the symmetrical nature of the design, even- and odd-mode analysis is used to derive the closed-form to describe the reconfigurable filters’ behavior. The switching between narrowband and wideband is achieved using PIN diodes. In the first implementation (λg/4 open-ended stubs to 3λg/4 open-ended stubs), a reconfigurable bandwidth bandpass filter is proposed where additional out-of-band transmission zeros are generated by integrating a λg/2 open-ended stub at the input port. In the second implementation (λg/4 open-ended stubs to λg/2 short-ended stubs), further improvement in the upper stopband is achieved by utilizing a pair of parallel coupled lines (PCLs) as feeding lines and a pair of λg/4 high impedance short-ended stubs implemented at the input and output ports. To verify the validity of the simulated results, the prototypes of the proposed reconfigurable filters were fabricated. For the first case, measured insertion loss is less than 1.8 dB with a switchable 3-dB fractional bandwidth (FBW) range from 28% to 54%. The measured results for the second case exhibit a low insertion loss of less than 1 dB and a 3-dB fractional bandwidth that can be switched from 34% to 75%, while the center frequency is kept constant at 2.4 GHz in both cases. Full article
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11 pages, 1148 KiB  
Article
A Stochastic Finite-Difference Time-Domain (FDTD) Method for Assessing Material and Geometric Uncertainties in Rectangular Objects
by Christos Salis, Nikolaos Kantartzis and Theodoros Zygiridis
Technologies 2020, 8(1), 12; https://doi.org/10.3390/technologies8010012 - 27 Jan 2020
Cited by 3 | Viewed by 3844
Abstract
The uncertainties present in a variety of electromagnetic (EM) problems may have important effects on the output parameters of interest. Unfortunately, deterministic schemes are not applicable in such cases, as they only utilize the nominal value of each random variable. In this work, [...] Read more.
The uncertainties present in a variety of electromagnetic (EM) problems may have important effects on the output parameters of interest. Unfortunately, deterministic schemes are not applicable in such cases, as they only utilize the nominal value of each random variable. In this work, a two-dimensional (2D) finite-difference time-domain (FDTD) algorithm is presented, which is suitable for assessing randomness in the electrical properties, as well as in the dimensions of orthogonal objects. The proposed technique is based on the stochastic FDTD method and manages to extract the mean and the standard deviation of the involved field quantities in one realization. This approach is applied to three test cases, where uncertainty exists in the electrical and geometrical parameters of various materials. The numerical results demonstrate the validity of our scheme, as similar outcomes are extracted compared to the Monte Carlo (MC) algorithm. Full article
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16 pages, 5228 KiB  
Article
Analysis of a Chaotic System with Line Equilibrium and Its Application to Secure Communications Using a Descriptor Observer
by Lazaros Moysis, Christos Volos, Viet-Thanh Pham, Sotirios Goudos, Ioannis Stouboulos, Mahendra Kumar Gupta and Vikas Kumar Mishra
Technologies 2019, 7(4), 76; https://doi.org/10.3390/technologies7040076 - 24 Oct 2019
Cited by 11 | Viewed by 4581
Abstract
In this work a novel chaotic system with a line equilibrium is presented. First, a dynamical analysis on the system is performed, by computing its bifurcation diagram, continuation diagram, phase portraits and Lyapunov exponents. Then, the system is applied to the problem of [...] Read more.
In this work a novel chaotic system with a line equilibrium is presented. First, a dynamical analysis on the system is performed, by computing its bifurcation diagram, continuation diagram, phase portraits and Lyapunov exponents. Then, the system is applied to the problem of secure communication. We assume that the transmitted signal is an additional state. For this reason, the nonlinear system is rewritten in a rectangular descriptor form and then an observer is constructed for achieving synchronization and input reconstruction. If we assume some rank conditions (on the nonlinearities and the solvability of a linear matrix inequality (LMI)) on the system matrices then the observer synchronization can be feasible. We evaluate and demonstrate our approach with specific numerical results. Full article
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