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Analysis Of Coupled Lines In Microwave Printed Circuit ElementsOzkal Piroglu, Sefika 01 December 2007 (has links) (PDF)
Full wave analysis of microstrip lines at microwave frequencies is performed by using method of moments in conjunction with closed-form spatial domain Green&rsquo / s functions. The Green&rsquo / s functions are in general Sommerfeld-type integrals which are computationally expensive. To improve the efficiency of the technique, Green&rsquo / s functions are approximated by their closed-forms.
Microstrip lines are excited by arbitrarily located current sources and are terminated by complex loads at both ends. Current distributions over microstrip lines are represented by rooftop basis functions. At first step, the current distribution over a single microstrip line is calculated. Next, the calculation of the current distributions over coupled microstrip lines is performed. The technique is then, applied to directional couplers. Using the current distributions obtained by the analysis, the scattering parameters of the structures are evaluated by using Prony&rsquo / s method. The results are compared with the ones gathered by using simulation software tools, CNL/2&trade / and Agilent Advanced Design System&trade / (ADS).
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Analysis Of Slot Coupled Patch Antennas Using Closed Form GreenGoksu, Mesut 01 August 2009 (has links) (PDF)
In this thesis, an analysis technique for the slot coupled patch antennas using MoM in
conjunction with the closed form Green&rsquo / s functions is presented. Slot coupled patch
antennas are fed by a microstrip open stub which is coupled to the patch through an
electrically small slot. Current distributions over the microstrip line, slot line and the
patch are represented by rooftop basis functions. First, a relatively simple structure,
microstrip coupled slot line is investigated using the proposed technique. Then the
method is extended to the slot coupled patch antenna geometry. By using the method,
current distributions on the feedline and the patch are calculated for a generic slot
coupled patch antenna. Then by using the distributions, return scattering parameters
of the antenna is approximated with complex exponentials using Prony&rsquo / s method. A
parametric study is carried out to observe the effect of each antenna component on
the antenna performance. Current distributions and return loss calculations are
repeated for modified antennas to observe and demonstrate the performance
differences. All simulations are verified using HFSS® / software and the results
available in the literature.
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