BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Australia/Adelaide BEGIN:DAYLIGHT DTSTART:20221002T030000 TZOFFSETFROM:+0930 TZOFFSETTO:+1030 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=10 TZNAME:ACDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20220403T020000 TZOFFSETFROM:+1030 TZOFFSETTO:+0930 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=4 TZNAME:ACST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20220907T060101Z UID:8B452F2C-2472-4AB9-95C1-30B0542CCE2A DTSTART;TZID=Australia/Adelaide:20220831T183000 DTEND;TZID=Australia/Adelaide:20220831T193000 DESCRIPTION:Please join us for a virtual presentation by Professor Karu Ess elle\n\nWednesday 31st August 2022\nat 6:30pm (ACST) / 7:00pm (AEST)\nmeet .google.com/svu-pkjs-ecp\nDial-in: (AU) +61 3 8594 5547\nPIN: 579 087 866# \n\nAbstract: No other antenna concept has more names. At present these an tennas are known as Fabry-Perot resonant cavity antennas\, just Resonant C avity Antennas (RCA)\, Partial Reflector Surface (PRS) based antennas\, El ectromagnetic Band Gap (EBG) Resonator antennas (ERAs) and Two-Dimensional Leaky-Wave Antennas\, and more names are forthcoming. Yet they all have m ore or less the same configuration consisting of a resonant cavity\, forme d between a partially reflecting superstructure and a fully reflecting (gr ound) plane. The resonant cavity is excited by a small feed antenna. Hence \, they are referred to as resonant cavity antennas (RCAs) in this present ation. Since the concept of using a “partially reflecting sheet array” superstructure to significantly enhance the directivity was disclosed by Trentini in 1956\, it has been an attractive concept to several antenna re searchers for several reasons\, including its theoretical elegance\, relat ionships to other well-researched area such as leaky-waves\, EBG\, frequen cy selective surfaces and metasurfaces\, and practical advantages as a low -cost simple way to achieve high-gain (15-25 dBi) from an efficient planar antenna without an array\, which requires a feed network. The RCA concept is one of the main beneficiaries of the surge of research on electromagne tic periodic structures in the last decade\, first inspired by EBG and the n to some extent by metamaterials. As a result\, RCAs gained a tremendous improvement in performance in the last 10 years\, in addition to other adv antages such as size reduction. As an example\, achieving 10% gain bandwid th from such an antenna with a PSS was a major breakthrough in 2006 but no w there are prototypes with gain bandwidths greater than 50%. Until recent ly most RCAs required an area in the range of 25-100 square wavelengths bu t the latest extremely wideband RCAs are very compact\, requiring only 1.5 -2 square wavelengths at the lowest operating frequency. Once limited to a select group of researchers\, these advantages have attracted many new re searchers to RCA research domain\, and the list is growing fast\, as demon strated by the diversity of authors in recent RCA publications. RCAs have already replaced other types of antennas\, for example as feeds for reflec tors. This presentation will take the audience through historical achievem ents of RCA technology\, giving emphasis to breakthroughs in the last 20 y ears up to a recent method of steering its beam continuously in 2D (i.e.\, azimuth and elevation).\n\nSpeaker(s): Professor Karu Esselle\, \n\nVirtu al: https://events.vtools.ieee.org/m/322180 LOCATION:Virtual: https://events.vtools.ieee.org/m/322180 ORGANIZER:luke.rosenberg@ieee.org SEQUENCE:2 SUMMARY:Many names\, many advantages – from Trentini to beam steering of modern (Fabry-Perot) Resonant Cavity antennas URL;VALUE=URI:https://events.vtools.ieee.org/m/322180 X-ALT-DESC:Description: <br /><p>Please join us for a virtual presentation by&nbsp\; Professor Karu Esselle</p>\n<p>Wednesday 31st August 2022<br />a t 6:30pm (ACST) / 7:00pm (AEST)<br />meet.google.com/svu-pkjs-ecp<br />Dia l-in: (AU) +61 3 8594 5547<br />PIN: 579 087 866#</p>\n<p>&nbsp\;</p>\n<p> Abstract: No other antenna concept has more names. At present these antenn as are known as Fabry-Perot resonant cavity antennas\, just Resonant Cavit y Antennas (RCA)\, Partial Reflector Surface (PRS) based antennas\, Electr omagnetic Band Gap (EBG) Resonator antennas (ERAs) and Two-Dimensional Lea ky-Wave Antennas\, and more names are forthcoming. Yet they all have more or less the same configuration consisting of a resonant cavity\, formed be tween a partially reflecting superstructure and a fully reflecting (ground ) plane. The resonant cavity is excited by a small feed antenna. Hence\, t hey are referred to as resonant cavity antennas (RCAs) in this presentatio n. Since the concept of using a &ldquo\;partially reflecting sheet array&r dquo\; superstructure to significantly enhance the directivity was disclos ed by Trentini in 1956\, it has been an attractive concept to several ante nna researchers for several reasons\, including its theoretical elegance\, relationships to other well-researched area such as leaky-waves\, EBG\, f requency selective surfaces and metasurfaces\, and practical advantages as a low-cost simple way to achieve high-gain (15-25 dBi) from an efficient planar antenna without an array\, which requires a feed network. The RCA c oncept is one of the main beneficiaries of the surge of research on electr omagnetic periodic structures in the last decade\, first inspired by EBG a nd then to some extent by metamaterials. As a result\, RCAs gained a treme ndous improvement in performance in the last 10 years\, in addition to oth er advantages such as size reduction. As an example\, achieving 10% gain b andwidth from such an antenna with a PSS was a major breakthrough in 2006 but now there are prototypes with gain bandwidths greater than 50%. Until recently most RCAs required an area in the range of 25-100 square waveleng ths but the latest extremely wideband RCAs are very compact\, requiring on ly 1.5-2 square wavelengths at the lowest operating frequency. Once limite d to a select group of researchers\, these advantages have attracted many new researchers to RCA research domain\, and the list is growing fast\, as demonstrated by the diversity of authors in recent RCA publications. RCAs have already replaced other types of antennas\, for example as feeds for reflectors. This presentation will take the audience through historical ac hievements of RCA technology\, giving emphasis to breakthroughs in the las t 20 years up to a recent method of steering its beam continuously in 2D ( i.e.\, azimuth and elevation).</p> END:VEVENT END:VCALENDAR