Since the infectious disease occurrence rate in the human community is gradually rising due to varied reasons, appropriate diagnosis and treatments are essential to control its spread. The recently discovered COVID-19 is one of the contagious diseases, which infected numerous people globally. This contagious disease is arrested by several diagnoses and handling actions. Medical image-supported diagnosis of COVID-19 infection is an approved clinical practice. This research aims to develop a new Deep Learning Method (DLM) to detect the COVID-19 infection using the chest X-ray. The proposed work implemented two methods namely, detection of COVID-19 infection using (i) a Firefly Algorithm (FA) optimized deep-features and (ii) the combined deep and machine features optimized with FA. In this work, a 5-fold cross-validation method is engaged to train and test detection methods. The performance of this system is analyzed individually resulting in the confirmation that the deep feature-based technique helps to achieve a detection accuracy of > 92% with SVM-RBF classifier and combining deep and machine features achieves > 96% accuracy with Fine KNN classifier. In the future, this technique may have potential to play a vital role in testing and validating the X-ray images collected from patients suffering from the infection diseases.
A frequency reconfigurable wide slot antenna is presented. The proposed antenna is capable of switching the frequency bands between 1.3 and 2.7 GHz. The antenna has an overall dimension of 70mm X 70mm X 1.6mm, with a wide slot printed on one side of the substrate (RT Duroid5880, ε r =2.2). A 50 Ω microstrip line printed on other side of the substrate is used to feed the slot. The antenna resonates at different frequency bands depending upon the feed line length. Hence the frequency re-configurability is achieved by varying the length of the feed line. When the length of the feed line is 30mm antenna resonates at 2.5GHz with an impedance bandwidth of 16% (2.25-2.65 GHz). For the feed line length of 40mm antenna resonates at 1.4GHz with an impedance bandwidth of 22% (1.31-1.62GHz). When the feed line length is changed to 60mm antenna resonates at 2.65GHz with an impedance bandwidth of 3% (2.61-2.69 GHz). The simulated and measured return loss and radiation pattern results for the proposed antenna are presented.
Keywords-wide slot antenna; frequency reconfigurableI.
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