scholarly journals Performance Analysis of Electromechanical Tuner for Broadband Application

2020 ◽  
Vol 9 (9) ◽  
pp. 11-13
Keyword(s):  
Performance Analysis ◽  
Communication Systems ◽  
Impedance Matching ◽  
Cost Effective ◽  
Experimental Results ◽  
Rf Power ◽  
Power Devices ◽  
Passive Components ◽  
Sensor Application ◽  
Set Up

The greatest challenges to RF power devices are to match impedance for coupled network. Many causes for improper impedance results in cable loss, reflection losses and hence reduce the performance of existing system. An Impedance tuner is designed for testing prior to final set up to get satisfactory output with saving time. In modern communication systems many technologies are adding relay coils and other compensating passive components. In this paper, an impedance matching tuner is designed for multiband application with compact and cost effective structure. The characteristics of fabricated tuner is designed for 50 ohm matching two port network .The designed Electro mechanical tuner is manually characterised on the basis of experimental results to validate the system. The results suggest that it works for multiband sub GHz, Bluetooth sensor application.

scholarly journals Numerical and Experimental Study on the Locally Blast Loaded Polyurea Coated Steel Plates

2019 ◽  
Vol 56 (3) ◽  
pp. 492-499
Author(s):  
Florina Bucur ◽  
Eugen Trana ◽  
Adrian Rotariu
Keyword(s):  
Experimental Tests ◽  
Cost Effective ◽  
Experimental Results ◽  
Steel Plates ◽  
Coated Steel ◽  
Quick Response ◽  
Blast Mitigation ◽  
Private Research ◽  
Set Up ◽  
Research Facilities

The damages and casualties inflicted by mine and IED attacks in security challenging areas generated a strong and quick response from nations all over the world. As a part of this response several national and private research facilities increased their efforts in identifying and implementing new ways or technologies to enable blast wave mitigation. The current paper aim to investigate the opportunity of using polyurea coated steel plates as a possible new blast mitigation approach, as suggested by several investigators. In order to objectively conclude about the ability of polyurea coated plates to sustain locally blast loads several experimental tests were performed according to STANAG 4569 demands for a 1/6 scaled plate structure. In order to numerically validate the experimental results several Autodyn simulations were set-up. The numerical and experimental results exibits a fair correlation, both pointing towards a dismiss of the idea of using polyurea coated steel plates as structural and cost effective blast mitigation approach.

scholarly journals Dual-Band Half Psi Shaped Antenna for WLAN, Wi-Fi and WiMAX Applications

2019 ◽  
Vol 8 (6) ◽  
pp. 1385-1388
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Impedance Matching ◽  
Ground Surface ◽  
Cost Effective ◽  
Dual Band ◽  
Wireless Communication Systems ◽  
Feed Line ◽  
Dual Band Antennas ◽  
The Cost

In the last few decades, the evolution in new-fashioned wireless communication systems has actuated augmented exploration on uncomplicated dual band antennas. In this paper, a dual-band half psi shaped antenna for WLAN, Wi-Fi and WiMAX appliances is designed and analyzed. The intended antenna constitutes a half psi shaped radiating patch on the cost effective FR4-substrate with 1.6 mm thickness. A 50 ohms feed line is employed to feed half psi shaped antenna. Here a preferable impedance matching is attained by truncating a portion of the ground surface. The intended antenna has the potential to resonate between the frequency bands of 1.88 GHz-2.75 GHz and 5.17 GHz-5.74 GHz with S11 below -10 dB. The design of the antenna and its behavior over various frequencies ranges is done with the use of HFSS. The proposed antenna has higher gains at two regions. The simulated antenna is also prototyped and a fine similarity is attained in between the simulated parameters and measured parameters.

scholarly journals Design of Dual Band Mono Pole Antenna for UWB and Ku Band Applications

2019 ◽  
Vol 8 (9) ◽  
pp. 3094-3098
Keyword(s):  
Communication Systems ◽  
Impedance Matching ◽  
Ground Plane ◽  
Cost Effective ◽  
Dual Band ◽  
Wireless Communication Systems ◽  
The Past ◽  
Rectangular Patch ◽  
Dual Band Antennas ◽  
Ku Band

Over the past few decades, the evolution in new-fashioned wireless communication systems has actuated augmented exploration on uncomplicated dual band antennas. A compact dual band mono pole antenna for UWB and Ku Band Applications is proposed. The antenna consists of a corner truncated rectangular patch etched on cost effective FR4-substrate with thickness 1.6mm and is fed with 50 ohms feed line. The ground plane is truncated to enhance impedance matching and bandwidth. The proposed antenna has the ability to operate from 3.40 GHz to 10.67 GHz and 13.48 GHz to 15.87 GHz with return loss below -10 dB. The HFSS is used to design and simulate the antennas behavior over the different frequency ranges. The simulated results of the proposed antenna indicate higher gain at the two bands. The measured results demonstrated reasonable agreement with the simulated results

scholarly journals Environmental Engineering Techniques to Restore Degraded Posidonia oceanica Meadows

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 661
Author(s):  
Luigi Piazzi ◽  
Stefano Acunto ◽  
Francesca Frau ◽  
Fabrizio Atzori ◽  
Maria Francesca Cinti ◽  
...  
Keyword(s):  
Large Scale ◽  
Natural Habitat ◽  
Cost Benefit ◽  
Cost Effective ◽  
Posidonia Oceanica ◽  
Environmental Engineering ◽  
Bottom Surface ◽  
Sessile Invertebrates ◽  
Set Up ◽  
Short Time

Seagrass planting techniques have shown to be an effective tool for restoring degraded meadows and ecosystem function. In the Mediterranean Sea, most restoration efforts have been addressed to the endemic seagrass Posidonia oceanica, but cost-benefit analyses have shown unpromising results. This study aimed at evaluating the effectiveness of environmental engineering techniques generally employed in terrestrial systems to restore the P. oceanica meadows: two different restoration efforts were considered, either exploring non-degradable mats or, for the first time, degradable mats. Both of them provided encouraging results, as the loss of transplanting plots was null or very low and the survival of cuttings stabilized to about 50%. Data collected are to be considered positive as the survived cuttings are enough to allow the future spread of the patches. The utilized techniques provided a cost-effective restoration tool likely affordable for large-scale projects, as the methods allowed to set up a wide bottom surface to restore in a relatively short time without any particular expensive device. Moreover, the mats, comparing with other anchoring methods, enhanced the colonization of other organisms such as macroalgae and sessile invertebrates, contributing to generate a natural habitat.

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