scholarly journals Microwave Antenna Performance Metrics

10.5772/48517 ◽  
2012 ◽  
Author(s):  
Paul Osaretin
Keyword(s):  
Performance Metrics ◽  
Microwave Antenna ◽  
Antenna Performance

scholarly journals Mechanically Reconfigurable, Beam-Scanning Reflectarray and Transmitarray Antennas: A Review

2021 ◽  
Vol 11 (15) ◽  
pp. 6890
Author(s):  
Mirhamed Mirmozafari ◽  
Zongtang Zhang ◽  
Meng Gao ◽  
Jiahao Zhao ◽  
Mohammad Mahdi Honari ◽  
...  
Keyword(s):  
Performance Metrics ◽  
Efficiency Gain ◽  
Beam Scanning ◽  
Gain Bandwidth ◽  
Aperture Efficiency ◽  
Antenna Performance ◽  
Scanning Range

We review mechanically reconfigurable reflectarray (RA) and transmitarray (TA) antennas. We categorize the proposed approaches into three major groups followed by a hybrid category that is made up of a combination of the three major approaches. We discuss the examples in each category and compare their performance metrics including aperture efficiency, gain, bandwidth and scanning range and resolution. We also identify opportunities to build upon or extend these demonstrated approaches to realize further advances in antenna performance.

Investigation into the feasibility of inductively coupled antenna for use in smart clothing

2014 ◽  
Vol 26 (1) ◽  
pp. 25-37 ◽  
Author(s):  
Minyoung Suh ◽  
Katherine E. Carroll ◽  
Edward Grant ◽  
William Oxenham
Keyword(s):  
Performance Metrics ◽  
Systems Approach ◽  
Real Life ◽  
Relative Displacement ◽  
The Body ◽  
Content Type ◽  
Inductively Coupled ◽  
Smart Clothing ◽  
Antenna Performance ◽  
The Impact

Purpose – This research investigated the feasibility of using an inductively coupled antenna as the basis of applying a systems approach to smart clothing. In order to simulate real-life situations, the impact of the distortions and relative displacement of different fabric layers (with affixed antennas) on the signal quality was assessed. The paper aims to discuss these issues. Design/methodology/approach – A spiral antenna was printed on different fabric substrates. Obstructive conditions of the inductively coupled fabric layers were investigated to find out how much influence these conditions had on transmission performance. Reflected signals and transmitted signals were observed, while fabric antennas were subjected to displacement (distance and dislocation) or deformation (stretching and bending). The threshold of physical obstacles was estimated based on statistical analyses. Findings – The limits of physical conditions that enable proper wireless transmission were estimated up to ∼2 cm for both distance and dislocation, and ∼0.24 K for bending deformation. The antenna performance remained within an acceptable level of 20 percent transmission up to 10 percent fabric stretch. Based on well-established performance metrics used in clothing environment on the body, which employs 2-5 cm of ease, the results imply that the inductively coupled antennas may be suitable for use in smart clothing. Originality/value – This research demonstrates that the use of inductively coupled antennas on multiple clothing layers could offer the basis of a new “wireless” system approach to smart clothing. This would not only result in performance benefits, but would also significantly improve the aesthetics of smart clothing which should result in new markets for such products.

scholarly journals Antenna Evaluation for Ultra-Wideband Microwave Imaging

2010 ◽  
Vol 2010 ◽  
pp. 1-8 ◽  
Author(s):  
Jeremie Bourqui ◽  
Mark A. Campbell ◽  
Trevor Williams ◽  
Elise C. Fear
Keyword(s):  
Breast Imaging ◽  
Performance Metrics ◽  
Imaging System ◽  
Ultra Wideband ◽  
Frequency Range ◽  
Immersion Medium ◽  
Antenna Performance ◽  
Microwave Breast Imaging ◽  
The Relationship ◽  
Insight Into

Numerous antenna designs have been proposed for microwave breast imaging utilizing an ultra-wideband frequency range. The antennas are typically compact, operate in an immersion medium, and have a band covering at least 2–10 GHz. We have developed 3 antennas for our UWB microwave breast imaging system. In this contribution, we compare the performance of the antennas in order to gain insight into the relationship between antenna performance metrics and image quality.

scholarly journals An extraordinary transmission analogue for enhancing microwave antenna performance

AIP Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 107239 ◽  
Author(s):  
Sarin V. Pushpakaran ◽  
Jayakrishnan M. Purushothaman ◽  
Aanandan Chandroth ◽  
Mohanan Pezholil ◽  
Vasudevan Kesavath
Keyword(s):  
Microwave Antenna ◽  
Extraordinary Transmission ◽  
Antenna Performance

Framework for rare event detection using Artificial Neural Network based context free grammar

2020 ◽  
Vol 39 (6) ◽  
pp. 8463-8475
Author(s):  
Palanivel Srinivasan ◽  
Manivannan Doraipandian
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Event Detection ◽  
Performance Metrics ◽  
Rare Events ◽  
Rare Event ◽  
Video Stream ◽  
Context Free Grammar ◽  
Artificial Neural ◽  
Context Free

Rare event detections are performed using spatial domain and frequency domain-based procedures. Omnipresent surveillance camera footages are increasing exponentially due course the time. Monitoring all the events manually is an insignificant and more time-consuming process. Therefore, an automated rare event detection contrivance is required to make this process manageable. In this work, a Context-Free Grammar (CFG) is developed for detecting rare events from a video stream and Artificial Neural Network (ANN) is used to train CFG. A set of dedicated algorithms are used to perform frame split process, edge detection, background subtraction and convert the processed data into CFG. The developed CFG is converted into nodes and edges to form a graph. The graph is given to the input layer of an ANN to classify normal and rare event classes. Graph derived from CFG using input video stream is used to train ANN Further the performance of developed Artificial Neural Network Based Context-Free Grammar – Rare Event Detection (ACFG-RED) is compared with other existing techniques and performance metrics such as accuracy, precision, sensitivity, recall, average processing time and average processing power are used for performance estimation and analyzed. Better performance metrics values have been observed for the ANN-CFG model compared with other techniques. The developed model will provide a better solution in detecting rare events using video streams.

Education and the Relation to the Outside: A Little Real Reality

2015 ◽  
Vol 9 (3) ◽  
pp. 273-300 ◽  
Author(s):  
David Savat ◽  
Greg Thompson
Keyword(s):  
Performance Metrics ◽  
Online Courses ◽  
Massive Open Online Courses ◽  
Educational Institutions ◽  
Special Issue ◽  
Massive Open Online ◽  
Transformative Teaching ◽  
Control Society ◽  
Brave New World ◽  
Radical Transformation

One of the more dominant themes around the use of Deleuze and Guattari's work, including in this special issue, is a focus on the radical transformation that educational institutions are undergoing, and which applies to administrator, student and educator alike. This is a transformation that finds its expression through teaching analytics, transformative teaching, massive open online courses (MOOCs) and updateable performance metrics alike. These techniques and practices, as an expression of control society, constitute the new sorts of machines that frame and inhabit our educational institutions. As Deleuze and Guattari's work posits, on some level these are precisely the machines that many people in their day-to-day work as educators, students and administrators assemble and maintain, that is, desire. The meta-model of schizoanalysis is ideally placed to analyse this profound shift that is occurring in society, felt closely in the so-called knowledge sector where a brave new world of continuous education and motivation is instituting itself.

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