![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Pavlos-Lazaridis/publication/345250896/figure/tbl1/AS:953810805604356@1604417625987/Lower-and-upper-boundaries-of-the-parameters-to-be-optimized_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Pavlos-Lazaridis/publication/336512594/figure/fig2/AS:819379935653888@1572366808192/Geometry-parameters-of-the-proposed-antenna-array_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Pavlos-Lazaridis/publication/331559007/figure/fig4/AS:733555030228992@1551904556029/Normalized-radiation-patterns-produced-respectively-by-the-conventional-SMI-technique_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Ioannis-Gravas/publication/345319463/figure/fig2/AS:954422913933316@1604563563491/Constant-directivity-contour-curves_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Pavlos-Lazaridis/publication/325495658/figure/fig1/AS:653649030164480@1532853481511/Geometry-of-LTE-protected-LPDA_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Pavlos-Lazaridis/publication/336512594/figure/fig1/AS:819379935662080@1572366808085/CST-model-of-the-proposed-antenna-array_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Ioannis-Gravas/publication/345319463/figure/fig4/AS:954422913937410@1604563563598/Ackley-2D-graph_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/publication/341454493/figure/tbl1/AS:892519172829187@1589804561693/Optimization-Parameter-Limits_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Ioannis-Gravas/publication/355070717/figure/fig5/AS:1076742458474498@1633726815043/Rectangular-microstrip-patch_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/publication/341454493/figure/fig1/AS:892519172800517@1589804561581/Flowchart-of-the-optimization-procedure_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Ioannis-Gravas/publication/355070717/figure/fig3/AS:1076742458474496@1633726815016/General-beamformer-diagram-in-reception-mode_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Ioannis-Gravas/publication/355070717/figure/fig1/AS:1076742454284290@1633726814974/An-antenna-array-with-arbitrary-geometry_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Ioannis-Gravas/publication/355070717/figure/fig2/AS:1076742454284291@1633726814998/Incoming-signal-at-DOA-th-n-ph-n-received-by-an-antenna-array_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Pavlos-Lazaridis/publication/331559007/figure/fig3/AS:733555026051074@1551904555962/Normalized-radiation-patterns-produced-respectively-by-the-conventional-MVDR-technique_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/publication/341454493/figure/tbl2/AS:892519172800528@1589804561782/Optimized-Structure-Dimensions_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Pavlos-Lazaridis/publication/331559007/figure/fig5/AS:733555030237185@1551904556051/Normalized-radiation-patterns-produced-respectively-by-the-conventional-SMI-technique_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Zaharias-Zaharis/publication/339921219/figure/fig1/AS:868791894417409@1584147537870/Microstrip-linear-array-used-in-receiving-mode-by-a-beamformer_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/publication/341454493/figure/fig3/AS:892519172800518@1589804561654/S-parameters-of-the-array-elements-All-S-parameters-are-21-dB-at-698-MHz-DVB-T_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Ioannis-Gravas/publication/345319463/figure/fig1/AS:954422913933315@1604563563466/An-LPDA-modelled-in-CST-environment_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Ioannis-Gravas/publication/345319463/figure/fig5/AS:954422913933318@1604563563629/De-Jongs-1-st-function-2D-graph_Q320.jpg)
Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications
![Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications Ioannis GRAVAS | PhD Student | PhD on wireless communications, MEng/ECE | Aristotle University of Thessaloniki, Thessaloníki | AUTH | Electrical and Computer Engineering/Division of Telecommunications](https://www.researchgate.net/profile/Pavlos-Lazaridis/publication/331559007/figure/fig2/AS:733555026059267@1551904555935/Normalized-radiation-patterns-produced-respectively-by-the-conventional-MVDR-technique_Q320.jpg)