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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><o:p> </o:p></p><p class=Papertitle align=center style='text-align:center'><b><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:black'><img width=576 height=72 id="_x0000_i1026" src="cid:image001.jpg@01CCD69C.F11DDC50"><o:p></o:p></span></b></p><p class=Papertitle align=center style='text-align:center'><b><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></b></p><p class=Papertitle align=center style='margin-bottom:14.0pt;text-align:center'><b><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:black'>SEMINAR ANNOUNCEMENT<o:p></o:p></span></b></p><p class=Papertitle align=center style='text-align:center'><b><span style='font-size:14.0pt;font-family:"Calibri","sans-serif";color:black'>Design, Analysis, and Applications of Waveguide-Fed Slot Arrays<o:p></o:p></span></b></p><p class=Default><span style='font-size:14.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=Default align=center style='text-align:center'><b><span style='font-size:14.0pt;font-family:"Calibri","sans-serif"'>Prof. Sembiam R. Rengarajan<o:p></o:p></span></b></p><p class=Default align=center style='text-align:center'><span style='font-size:14.0pt;font-family:"Calibri","sans-serif"'>IEEE AP-S Distinguished Lecturer <o:p></o:p></span></p><p class=Default align=center style='text-align:center'><span style='font-size:14.0pt;font-family:"Calibri","sans-serif"'>Department of Electrical and Computer Engineering<o:p></o:p></span></p><p class=Default align=center style='text-align:center'><span style='font-size:14.0pt;font-family:"Calibri","sans-serif"'>California State University, Northridge, CA, USA<o:p></o:p></span></p><p class=Default align=center style='text-align:center'><span style='font-size:14.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=Default align=center style='text-align:center'><b><span style='font-size:14.0pt;font-family:"Calibri","sans-serif"'>Seminar Time: Friday, Jan. 20, 2012, 10:00-11:00 a.m., room E323-D3<o:p></o:p></span></b></p><p class=Default align=center style='text-align:center'><span style='font-size:14.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=Default align=center style='text-align:center'><b>Abstract<o:p></o:p></b></p><p class=Default><o:p> </o:p></p><p class=text>Waveguide-fed slot arrays find applications in radar, remote sensing, and communication systems because of their desirable characteristics such as low loss integrated feed and low volume. Accurate electromagnetic analysis and design tools have made it possible to produce such antennas in ‘one pass’ without any hardware iterations and still meet the stringent specifications commonly encountered in modern applications. Because of the all metal construction, slot arrays are ideally suited to withstand severe radiation environment encountered in space applications.<o:p></o:p></p><p class=text><o:p> </o:p></p><p class=text>This presentation will start with a review of Elliott’s procedure for designing waveguide fed linear and planar slot arrays. The required input data such as the scattering characteristics of isolated radiating and coupling elements may be obtained, based on techniques such as the method-of-moments (MoM) solution of the pertinent integral equations, or the finite element techniques, e.g., the commercial code HFSS, while the excitation coefficients are determined from a pattern synthesis technique. Stegen-type normalization or an interpolation technique will be used with the computed slot data. External mutual coupling computation in the form of ‘element by element’ model is ideal for small to medium arrays while Floquet series of the infinite array model is suited for large arrays. Different types of feeds and sub-array architectures will be reviewed. Efficient implementation of Elliott’s algorithm with choices for the values of radiating slot admittances and coupling slot impedances will be presented. Analysis techniques such as MoM and HFSS are employed to validate and assess the performance of the arrays. Enhancements to Elliott’s technique that account for higher order mode coupling and the use of full wave method-of-moments technique in improving the design procedure will be illustrated. Some recent examples of practical slot arrays antennas for different applications will be presented. The use of global optimization techniques such as the genetic algorithm in improving the return loss and pattern performance of slot arrays will also be discussed.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#595959'>Loretta Herbek</span><span style='font-family:"Arial","sans-serif";color:#595959'> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#595959'>Assistant to the Chairman<o:p></o:p></span></p><p class=MsoNormal><img width=288 height=36 id="Picture_x0020_1" src="cid:image002.gif@01CCD69C.F11DDC50" alt="electrical logo"><span style='font-size:10.0pt;font-family:"Book Antiqua","serif";color:#595959'><br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#595959'>N327, Engineering Building 1</span><span style='font-family:"Arial","sans-serif";color:#595959'> <br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#595959'>Houston, Texas 77204-4005</span><span style='font-family:"Arial","sans-serif";color:#595959'> <br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#595959'>Phone: 713-743-4435</span><span style='font-family:"Arial","sans-serif";color:#595959'> <br></span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#595959'>Fax: 713-743-4444</span><span style='font-family:"Arial","sans-serif";color:#595959'> <o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>