BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:US/Eastern BEGIN:DAYLIGHT DTSTART:20180311T030000 TZOFFSETFROM:-0500 TZOFFSETTO:-0400 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:EDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20181104T010000 TZOFFSETFROM:-0400 TZOFFSETTO:-0500 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:EST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20180606T223313Z UID:688D822F-1974-4D19-9FCD-A16C54CA2FEF DTSTART;TZID=US/Eastern:20180605T090000 DTEND;TZID=US/Eastern:20180605T100000 DESCRIPTION:ABSTRACT:\n\nWeather radar instruments have shown chronic failu re due to moving mechanical parts wearing over time. These current systems achieve a conical beam scan by revolving a parabolic reflector antenna by mechanical means. New designs must avoid moving parts and transition to a full electronic version while maintaining similar performance. Of the few design choices\, the Luneburg Lens Antenna comes to mind. This class of i nhomogeneous spherical lenses can achieve electronic scanning of a beam th rough a conical pattern sweep with no scan loss. However\, these lenses ar e too massive and heavy. A more lightweight design which achieves similar pattern performance is necessary.\n\nOur approach to achieving such a desi gn is a shaping algorithm based on geometrical optics (GO) and particle sw arm optimization (PSO). The GO is equipped with the capability to trace ra ys through inhomogeneous media\, thus allowing the synthesis of both shape and material. The extra degree of freedom allows one to obtain even thinn er\, more lightweight lenses\, with superior scan performance. The boundin g surface and permittivity filling the volume of the lens is parameterized using power series expansions with unknown coefficients. Each set of coef ficients defines a unique design for characterization through the GO Analy sis routine. By integrating the GO algorithm with the PSO method\, the opt imum set of coefficients are converged upon quickly. This design meets the goals of light-weight and conically scanned revolving beam via electronic means\, thus achieving the original project goals. However\, the obtained design specifies a material permittivity variation which is difficult to manufacture. To address this issue\, we take advantage of the 3D printing revolution to ‘print’ the resultant complex materials on demand. Howev er\, once again\, this approach brings its own challenges. Materials must be accurately characterized electromagnetically and evaluated for spacebor ne use. We present our analyses of two such materials and highlight the ad vantages and disadvantages of each material in terms of loss\, print quali ty\, and mechanical strength.\n\nSeveral breadboard models of 3D printed l enses which meet the design goals are presented along with measurement val idation. Measurements are performed in both the UCLA plane bi-polar near f ield and the UCLA spherical near field measurement range.\n\nAlso presente d is recent work on reflectarray antennas for CubeSat applications. To obt ain the design of the reflectarray antenna system\, complex computer codes must be developed. These codes are based on the SDMoM employing the Infin ite Array Analysis Technique commonly used for periodic structure and phas ed array analysis.\n\nBIOGRAPHY:\n\nJordan Budhu is a Ph.D. candidate at t he University of California Los Angeles (UCLA) under the advisement of Pro fessor Yahya Rahmat-Samii in the Antenna Research\, Analysis\, and Measure ment (ARAM) Laboratory. He received his M.S.E.E. degree with Distinction i n 2010 from California State University Northridge under the advisement of Professor Sembiam Rengarajan. In 2006\, he won the first place award for his undergraduate senior project. In 2012\, he won the Best Poster award a t the IEEE Coastal Los Angeles Class-Tech Annual Meeting. In 2010\, he was awarded the Eugene Cota-Robles Fellowship from UCLA. He has taught numero us undergraduate courses as first a Teaching Assistant in the 2012-2013 Ac ademic year at UCLA\, then promoted to Teaching Associate in the 2016-2017 Academic Year at UCLA\, then finally promoted to a Teaching Fellow in the 2017-2018 Academic Year at UCLA. He was also selected to be the Head EE D epartment TA at UCLA for the Fall 2018 quarter\, a position selected to be awarded to a single candidate of nearly 100 TA’s in the department. He was also an employee at the NASA Jet Propulsion Laboratory in 2011 and 201 2. He is the author of numerous publications in various IEEE antennas and propagation society journals. He is also a member of both IEEE APS and the Bioelectromagnetics Societies.\n\nCo-sponsored by: Co-sponsored with Radi ation Laboratory and IEEE Southeastern MI Trident Chapter IV\n\nSpeaker(s) : Jordan Budhu\, \n\nRoom: 1005\, Bldg: EECS\, 1301 Beal Ave\, Ann Arbor\, Michigan\, United States\, 48109 LOCATION:Room: 1005\, Bldg: EECS\, 1301 Beal Ave\, Ann Arbor\, Michigan\, U nited States\, 48109 ORGANIZER:agrbic@umich.edu SEQUENCE:3 SUMMARY:IEEE SEM Chapter IV seminar\, Next Generation Spaceborne Wind Scatt erometer and CubeSat Antennas: Lightweight 3D Printed Inhomogeneous Lens A ntennas and Dual Reflectarray Antennas URL;VALUE=URI:https://events.vtools.ieee.org/m/173607 X-ALT-DESC:Description: <br /><p><strong>ABSTRACT</strong>:</p>\n<p align=" LEFT"><span style="font-size: 12pt\;">Weather radar instruments have shown chronic failure due to moving mechanical parts wearing over time. These c urrent systems achieve a conical beam scan by revolving a parabolic reflec tor antenna by mechanical means. New designs must avoid moving parts and t ransition to a full electronic version while maintaining similar performan ce. Of the few design choices\, the Luneburg Lens Antenna comes to mind. T his class of inhomogeneous spherical lenses can achieve electronic scannin g of a beam through a conical pattern sweep with no scan loss. However\, t hese lenses are too massive and heavy. A more lightweight design which ach ieves similar pattern performance is necessary. </span></p>\n<p><span styl e="font-size: 12pt\;">Our approach to achieving such a design is a shaping algorithm based on geometrical optics (GO) and particle swarm optimizatio n (PSO). The GO is equipped with the capability to trace rays through inho mogeneous media\, thus allowing the synthesis of both shape and material. The extra degree of freedom allows one to obtain even thinner\, more light weight lenses\, with superior scan performance. The bounding surface and p ermittivity filling the volume of the lens is parameterized using power se ries expansions with unknown coefficients. Each set of coefficients define s a unique design for characterization through the GO Analysis routine. By integrating the GO algorithm with the PSO method\, the optimum set of coe fficients are converged upon quickly. This design meets the goals of light -weight and conically scanned revolving beam via electronic means\, thus a chieving the original project goals. However\, the obtained design specifi es a material permittivity variation which is difficult to manufacture. To address this issue\, we take advantage of the 3D printing revolution to & lsquo\;print&rsquo\; the resultant complex materials on demand. However\, once again\, this approach brings its own challenges. Materials must be ac curately characterized electromagnetically and evaluated for spaceborne us e. We present our analyses of two such materials and highlight the advanta ges and disadvantages of each material in terms of loss\, print quality\, and mechanical strength.</span></p>\n<p><span style="font-size: 12pt\;">Se veral breadboard models of 3D printed lenses which meet the design goals a re presented along with measurement validation. Measurements are performed in both the UCLA plane bi-polar near field and the UCLA spherical near fi eld measurement range.</span></p>\n<p><span style="font-size: 12pt\;">Also presented is recent work on reflectarray antennas for CubeSat application s. To obtain the design of the reflectarray antenna system\, complex compu ter codes must be developed. These codes are based on the SDMoM employing the Infinite Array Analysis Technique commonly used for periodic structure and phased array analysis.</span></p>\n<p><br /><strong>BIOGRAPHY</strong >:</p>\n<p align="LEFT"><span style="font-size: medium\;"><span style="fon t-size: 12pt\;">Jordan Budhu is a Ph.D. candidate at the University of Cal ifornia Los Angeles (UCLA) under the advisement of Professor Yahya Rahmat- Samii in the Antenna Research\, Analysis\, and Measurement (ARAM) Laborato ry. He received his M.S.E.E. degree with Distinction in 2010 from Californ ia State University Northridge under the advisement of Professor Sembiam R engarajan. In 2006\, he won the first place award for his undergraduate se nior project. In 2012\, he won the Best Poster award at the IEEE Coastal L os Angeles Class-Tech Annual Meeting. In 2010\, he was awarded the Eugene Cota-Robles Fellowship from UCLA. He has taught numerous undergraduate cou rses as first a Teaching Assistant in the 2012-2013 Academic year at UCLA\ , then promoted to Teaching Associate in the 2016-2017 Academic Year at UC LA\, then finally promoted to a Teaching Fellow in the 2017-2018 Academic Year at UCLA. He was also selected to be the Head EE Department TA at UCLA for the Fall 2018 quarter\, a position selected to be awarded to a single candidate of nearly 100 TA&rsquo\;s in the department. He was also an emp loyee at the NASA Jet Propulsion Laboratory in 2011 and 2012. He is the au thor of numerous publications in various IEEE antennas and propagation soc iety journals. He is also a member of both IEEE APS and the Bioelectromagn etics Societies.</span> </span></p> END:VEVENT END:VCALENDAR