Essay On Feed Forward Back Propagation - 1240 Words

In the present chapter Feed forward back propagation (FFBP), Layer recurrent and NARX artificial neural network structures with Levenberg – Marquardt training algorithm are suggested for estimation of the radius for a given resonant frequency of a centre feed microstrip patch antenna and it is demonstrated using a circular patch geometry. Through the particular chapter the effect of the variation in the resonant frequency on the radius and vice versa has been analysed using two-layered FFBP, Layer recurrent and NARX ANN models. The analysis model is developed for the determination of radius in this work because in usual practise the synthesis part comprised of finding the radius and the analysis part was about finding the resonant†¦show more content†¦dielectric constant (ÃŽ µr) = 4.3, loss tangent = 0.025, substrate thickness (h) = 1.6 mm, radius (a) = 20 mm, where the value of radius has been varied from 10mm radius (a) 50mm for calculating the resonant frequencies for the training and testing purpose. The graph of return loss vs. frequency is shown in figure 2.2. The example antenna is resonating at 3.3333 GHz. From the curve, it can be seen that the proposed circular microstrip antenna design is giving good return loss of -22.885dB at 3.3333 GHz. After simulating the example antenna with the predefined parameters the radius is varied and simulated with the help of CST in the specified ranges i.e. 10 mm ≠¤ radius ≠¤ 50 mm with an interval of 0.1 mm in between two successive values which are later used as data for ANN training, validating and testing. It is observed that as the radius of the circular patch increases, resonating frequency of the antenna decreases. Feed forward back propagation (FFBP), Layer recurrent and NARX neural networks are used to implement the analysis ANN models. These models are trained with Levenberg– Marquardt training algorithm. The transfer function used is tansig (tangent sigmoid) with learning rate = 0.1. The number of neurons is kept 10 in all the networks. In total 50 patterns are generated to evaluate the performance of proposed FFBP, Layer recurrentShow MoreRelatedBack Propagation For Classification ( Research Essay )3007 Words   |  13 PagesBack Propagation for Classification (Research Essay) Linfeng Gu Introduction This research essay mainly discusses back propagation used in artificial neural networks based on three research papers. From the second section, each section contains the discussion of one research paper. In the first research paper, researchers apply feed forward neutral networks with back propagation in medical fields and present several statistical normalization methods. [4] In the second research paper, researchersRead MoreAndrocentrism: Feminists for Equality2854 Words   |  12 Pagessecondary aid to the creation of life. It is easy to see in Aristotle’s composition that he views women as a secondary being to men, even from the first few paragraphs of these passages on generation. Women are not even given credit for child birth or propagation in these passages, and are instead openly criticized for things like birth defects, menstruation, and not dealing with child birth better. (25-27) It is also Aristotle who first describes women as a defective male, and thus sets the tone for theRead MoreConsequences of Joseph Stalins Leadership Essay examples3187 Words   |  13 Pages needed stabilising and capital invested in the major companies. Stalin implemented hard-line tactics to obtain this in the shortest possible time - the consequences of this method of developing the country are to be discussed in this essay. The politicians of the period had to contend Stalins ruthless quest to become the omnipotent and unopposed ruler of Russia. The communist system was a relatively new radical political system within Russia. Stalin felt that the lessRead MoreOrganisational Theory230255 Words   |  922 Pagessustainable forests. . Brief Contents Preface List of figures List of tables Acknowledgements xiii xvii xix xx 1 2 3 4 5 6 7 8 9 10 Introducing organization theory: what is it, and why does it matter? Modernist organization theory: back to the future? Neo-modernist organization theory: putting people first? Neo-modernist organization theory: surfing the new wave? Postmodernist organization theory: new organizational forms for a new millennium? Postmodernism as a philosophy: the ultimate