BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Asia/Shanghai BEGIN:STANDARD DTSTART:19910915T010000 TZOFFSETFROM:+0900 TZOFFSETTO:+0800 TZNAME:CST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20251010T033738Z UID:D6A0E681-D55D-44EC-B065-2BEA01E3BB22 DTSTART;TZID=Asia/Shanghai:20250707T140000 DTEND;TZID=Asia/Shanghai:20250707T160000 DESCRIPTION:The analysis of electromagnetic scattering from open-ended wave guide cavities has received much attention recently in connection with the prediction and reduction of the radar cross section (RCS) of a target. Th is problem serves as a simple model of duct structures such as jet engine intakes of aircrafts and cracks occurring on surfaces of general complicat ed bodies. In this talk\, we shall consider two canonical\, parallel-plate waveguide cavities with material loading\, and carry out a comparative RC S analysis of these cavities using the Wiener-Hopf technique. The first ge ometry (referred to as Cavity I) is a cavity formed by a semi-infinite par allel-plate waveguide with an interior planar termination\, where three di fferent material layers are coated on the surface of the terminated plate. The second geometry (referred to as Cavity II) is a cavity formed by a fi nite parallel-plate waveguide with a planar termination at the aperture of the waveguide\, where the same material layers as in Cavity I are coated on the surface of the terminated plate at the aperture.\n\nWe shall rigoro usly analyze the plane wave diffraction by Cavity I and by Cavity II separ ately using the Wiener-Hopf technique. Both E and H polarizations are cons idered. Introducing the Fourier transform of the scattered field and apply ing boundary conditions in the transform domain\, these two problems are b oth formulated in terms of the simultaneous Wiener-Hopf equations. The Wie ner-Hopf equations are solved exactly via the factorization and decomposit ion procedure. It should be noted that the solution for Cavity I contains infinite series with unknown coefficients\, whereas the solution for Cavit y II contains infinite series with unknown coefficients as well as branch- cut integrals with unknown integrands. Applying a rigorous asymptotics wit h the aid of the edge condition\, highly-accurate approximate solutions fo r Cavity I and Cavity II are obtained. We will show numerical examples of the RCS of the two cavities for various physical parameters\, and discuss the far field scattering characteristics in detail.\n\nSpeaker(s): Prof. K azuya Kobayashi\n\nRoom 742\, Zhixin Building\,\, No. 4800 Cao'an Road\, S hanghai\, Shanghai\, China\, 201800\, Virtual: https://events.vtools.ieee. org/m/491171 LOCATION:Room 742\, Zhixin Building\,\, No. 4800 Cao'an Road\, Shanghai\, S hanghai\, China\, 201800\, Virtual: https://events.vtools.ieee.org/m/49117 1 ORGANIZER:xiaojielu@tongji.edu.cn SEQUENCE:13 SUMMARY:Radar Cross Section Analysis of Two Canonical\, Parallel-Plate Wave guide Cavities with Material Loading URL;VALUE=URI:https://events.vtools.ieee.org/m/491171 X-ALT-DESC:Description: <br /><p class="MsoNormal"><span lang="EN-US" style ="font-family: 'Times New Roman'\,serif\;">The analysis of electromagnetic scattering from open-ended waveguide cavities has received much attention recently in connection with the prediction and reduction of the radar cro ss section (RCS) of a target. This problem serves as a simple model of duc t structures such as jet engine intakes of aircrafts and cracks occurring on surfaces of general complicated bodies. In this talk\, we shall conside r two canonical\, parallel-plate waveguide cavities with material loading\ , and carry out a comparative RCS analysis of these cavities using the Wie ner-Hopf technique. The first geometry (referred to as Cavity I) is a cavi ty formed by a semi-infinite parallel-plate waveguide with an interior pla nar termination\, where three different material layers are coated on the surface of the terminated plate. The second geometry (referred to as Cavit y II) is a cavity formed by a finite parallel-plate waveguide with a plana r termination at the aperture of the waveguide\, where the same material l ayers as in Cavity I are coated on the surface of the terminated plate at the aperture.</span></p>\n<p class="MsoNormal" style="text-indent: 21.0pt\ ; mso-char-indent-count: 2.0\;"><span lang="EN-US" style="font-family: 'Ti mes New Roman'\,serif\;">We shall rigorously analyze the plane wave diffra ction by Cavity I and by Cavity II separately using the Wiener-Hopf techni que. Both E and H polarizations are considered. Introducing the Fourier tr ansform of the scattered field and applying boundary conditions in the tra nsform domain\, these two problems are both formulated in terms of the sim ultaneous Wiener-Hopf equations. The Wiener-Hopf equations are solved exac tly via the factorization and decomposition procedure. It should be noted that the solution for Cavity I contains infinite series with unknown coeff icients\, whereas the solution for Cavity II contains infinite series with unknown coefficients as well as branch-cut integrals with unknown integra nds. Applying a rigorous asymptotics with the aid of the edge condition\, highly-accurate approximate solutions for Cavity I and Cavity II are obtai ned. We will show numerical examples of the RCS of the two cavities for va rious physical parameters\, and discuss the far field scattering character istics in detail.</span></p> END:VEVENT END:VCALENDAR