Experimental Description

0131-EX-CM-2019 Text Documents

Brown University

2019-05-23ELS_230582

Call Sign: WI2XVX File No. 0131‐EX‐CM‐2019 Applicant: Brown University FRN: 0003‐5995‐37 EXPERIMENTAL DESCRIPTION Purpose of Application The purpose of this application is to change emission designators to show modulation of the signal as data at 1 Gbps. A duplicate line on the existing license which shows the same make and model of transmitter twice is deleted, as there is only one transmitter at this time. No changes in frequencies, power, locations, or other operating parameters are proposed. Contact Information The STOP BUZZER contact remains Daniel Mittleman, Professor of Engineering, at 713‐992‐4137, daniel_mittleman@brown.edu. Any questions about this application should be directed to Dr. Michael Marcus, Consultant to Brown University, at 301‐229‐7714, mjmarcus@marcus‐spectrum.com. Ongoing Experimental Program This license will continue to be used by Daniel Mittleman, Professor of Engineering at Brown University, for propagation measurement experiments on the Brown campus in Providence RI. Prof. Mittleman is a qualified researcher in this field, who has written extensively on the subject of TeraHertz propagation. The purpose of the experiment is to gather measurement data with respect to propagation in a complex environment at frequencies of approximately 100, 200, 300 and 400 GHz. Prof. Mittleman participated in ET Docket No. 18‐21, the Spectrum Horizons rulemaking. Attached is a recently published article describing his work using this experimental license. {WI2XVS~2-1 }

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Welcome to the second an— Stephen Robert Hall, an expansion designed to fuel an expand— nual issue of Impact: Research ing community of scholars working on giobal policy issues. at Brown, and to the many sto— The fatest research hub is at 164 Angell Street, the state— ries of outstanding work by of—the—art collaborative home of the Data Science Initlative, the Brown faculty and students. Center for Computational Molecular Biology, the Carney Institute We are building on many fronts for Brain Science, and the Annenberg Institutefor School Reformn. in our research, in bricks—and— in this year‘s Impact, you‘ll read about research made pos— mortar structures and even sible by these Brown investments and by funding from federal more in relationships, and there agencies and foundations. The Carmey Instffute, newly named is much exciting news to share. by an extraordinarity generous gift, is on the leading edge of ad— Let‘s start in downtown vancing research in brain science toward cures and treatments Providence, where Brown is investing in a newly thriving entre— for ALS, Parkinson‘s, and other neurological disorders and dis— prensurial and research—intensive ecosystem that is supporting eases..Continuing a proud tradition of excelience in particle the University‘s ambitions in translational medical research, forg— physics, Brown researchers continue to make discoveries con— ing new industry partnerships, and much more. tributing to our understanding of the universe, and play leading it is home to the Warren Alpert Medical School, flourishing roles in the multinational upgrade of the particle collider in Europe. medical/biology labs, the School of Public Health, the Institute The Center for the Study of Slavery and Justice marks its fifth for Computational and Experimental Research in Mathematics, year with an ambitious agenda. And our undergraduates are and, most recenily, the South Street Landing building, which is engaging in remarkable research projects, including creating inspiring collaboration between my office and hundreds of other EQUiSat, a small satellite deployed in July by astronauts on the key administrative staff consolidated there. Later this year, our International Space Station. growing School of Professional Studies will join the Jewelry | hopethat you enjoy this year‘s selection of stories and this District‘s new Innovation Center in a building developed by glimpse of the depth and breadth of research and scholarship Wexford Science & Technology. at Brown. %} On College Hil, wo dedicated the Engineering Research Centerlast May. This three—story, 80,000—square—foot structure has specialized research laboratories and collaborative spaces for biomedical engineering, advanced materials, environmental Jilf Pipher engineering, and other programs. in December, the Watson In— Vice President for Research stitute for International and Public Affairs opened the doors to Elisha Benfamin Andrews Professor of Mathematios Connect Vice President for Research Vp_research@brown.edu RESEARCH AT BROWN 401—863—7408 Brown University EDITOR Box 1997 Noe! Rubinton 350 Eddy Street L2onl ns DESIGNER Providence, R.J. 02912 Min O. Design Office of Industry Engagement and Impact: Research at Brown is published annually Commercial Venturing by the Office of the Vice President for Research and the IECV_BD@brown.edu Office of University.Communications Office of Research Development research_opps@brown.edu On the Cover: A simulation of radiation emerging from a Office of Foundation Relations onvivinza xom terahertz multiplexer. Terahertz is high—frequency radiation that foundationrelations@brown.edu could.enable the next generation of ultra—high—bandwicth networks to handle more data. (Mittleman lab/Brown University/Ducournau Lab/CNRS/University of Lifle} C For ongoing news about Brown research, follow us on Twitter @BrownUResearch. IMPAGT 2019

A CLOSER LOOK AT RESEARCHERS AND PROJECTS GAINING WIDER INFLUENCE Information Ultra—Highway Transmitting data via terahertz waves shows promise in unclogging the data logjam. BY KEVIN STACEY AND NOEL RUBINTON ‘77 When Alexander Graham Bell phone receiver was ultimately in the Schoolof Engineering— crowave radiation to carty transformed communications adopted by Bell. is working with colleagues to data, but the,.demand for with the telephone in the With the revolution in com— find a way to soive a orftical more and more bandwidth is 1870s, he had an assist munications now going at togjam on the modern—day in— rapidly becoming more than from two Brown professors—— speeds that Bell could never formation superhighway. microwaves can handle. That Elt Whitney Blake and John have imagined, another Brown Today‘s cellular networks has researchers thinking about Peircee—whose work on a professor—Daniel Mittleman and Wi—Fi systems rely on mi— transmitting data on higher— frequency terahertz waves, which have as much as 100 times the data—carrying capac— ity of microwaves. Mittlieman is at the fore— amin 10 AuskgAiNn/SuND/aYT nvnunoong/aLisiaatyn NMOHB/eY? NVWSTLLIR front of those exploring the field of terahertz technology. Though terahertz transmis— sion remains in an early stage, with much basic research to be done and plenty of chal— lenges to overcome, Mittle— manis leading many key ave— nues of investigation. He and his colleagues are working to develop the basic compo— nents and techniques needed to make terahertz communi— cations a reality. Multiptexing, the ability to send multiple signals through a single channel, is a funda— mental feature of any voice or data communication system. An international research A simulation of radiation emerging from a terahertz multiplexer. Terahertz could team led by Miftieman has enable the next generation of ultra—high—bandwidth networks to handle more data. demonstrated for the first time 38 imPacTt 2019

a method for multiplexing data sion to perform outdoor tests camed on terahertz waves, of data transmission in several which may enable the next frequency bands in the tera— generation of ultra—high—band— hertz range. "These kinds of Brown gradliate student Rabi Shrestha works on width wireless networks. outdoor tests will be impor— terahertz testing equipment. "The terahertz range is of— taht for understanding what‘s ten called the ‘last frontier‘ of possible in terahertz commu— will bounceoff the ground be— to make a polarizing beam— the electromagnetic spectrum, nication," Mittleman said. fore reaching the receiver. splitter, a device that splits a since it is the least well e« The first outdoor tests have That reflected radiation can beam of light by its differing plored range of the spectrum," proven promising, in some interfere with the main signal polarization states, sending Mittleman said. "There‘s a good cases easing concerns about unless a decedar compensates vertically potarized light in one reason for this: everything is the versatility of terahertz links. for it. It‘s a well—understood direction and horizontally po—: more challenging in this For example, it‘s long been phenomenon in microwave larized light in another. Such a range, including generating assumed that terahertz links transmission, and .Mittieman beamspiitter could be useful the radiation, manipulating it, would require a direct line of and his colleagues wanted to in a wide veriety of systems and detecting it. But, with sight between receiver and test it in the terahertz range. that make use of terahertz ra— thése challenges, there are transmitter. But Mittieman and They showed that this kind diation, from imaging systems ‘glso tremendous opportuni— his team showed that non— of interference ocours in tera— to future communications net— fies for new science and new line—of—sight terahertz data hertz waves but to a lesser works. ieohnologies“‘ links are possible because the degree over grass compared Terahertz radiation is a hot In the journal Nature Com— waves can bounce off of walls to concrete.. That‘s likely be— area of study, and the work munications, Mitieman and and other obstacles without cause grass contains a lot of isn‘t limited to data transmis— his team reported the trans— losing too much data. Mittle— water, which tends to absorb sion. Mittleman and Professor mission of two real—time video man and his colleagues terahertz waves. Over grass, Vick! Colvin from Brown‘s signals through a terahertz bounced terahertz waves at the reflected beam is ab— chemistry department are multiplexer at an aggregate four different frequencies off sorbed to a greater degree heading a team that has im— than over. concrete, leaving proved the resolution of tera— less of it to interfere with the hertz emission spectroscopy— "There are also tremendous main beam. That means that a technique used to study a terahertz links over grass can wide variety of materials— opportunities for be longer than those over by a thousandfold, making new science, and new concrete because there‘s less the technique useful at the technologies." interference to deal with, Mit— nanoscale. Laser terahertz tleman said. emission microscopy is a bur— —Danicl Mittleman There‘s also an upside to geoning means of character— that kind of interference with zing the performance of solar data rate of 50 gigabits per of a variety of objects—mir— the ground. "You can imagine cells, integrated circuits, and second, approximately 100 rors, metal doors, cinderblock that if your line—of—site path is other systems and materials, times the optimal data rate of walls, and others—and mea— blocked," Mittleman said, "you . The researchers believe today‘s fastest cellular network. sured the error rate of the could think about bouncing it their new technique could be "We showed that we can data on the wave after the off the ground to get there." broadly useful in characteriz— transmit separate data streams bounces. They showed that in other terahertz work, ing the electrical properties of ‘ on terahortz waves at very acceptable error rates were Mittieman and others, includ— materials in unprecedented miTT.eman Lag/Bnown uniVérsiry high speeds and with very fow achievable with modest in— ing Masaya Nagai, an aca— detail. error rates," Mittieman said. . creases in signal power. demic colleague in Japan, "Terahertz emission has Mittlieman and his team The researchers afso have developed a new meth— been used to study different have even made the streets of looked at what‘s known as od of manipulating the polar materials—semiconductors, Providence near their Barus & multipath. interference. When ization of light at terahertz fre— superconductors, wide—band— Holley offices a literal living a signal is transmitted over quencies. gap insulators, integrated cir— laboratory. They have con— long distances, the waves fan The technique, outlined in cuits, and others," Mittleman ducted. measurements under out, forming an ever—widening a paper in the journal Scien— said. "Being able to do this down the first license from the Fed— cone. As a result of that fan— iflc Reports, uses stacks of to the leve! of individual nano— eral Communications Commis— ning out, a portion of waves carefully spaced metai plates structures is a big deal." 2019 IMPACT 39


Document Created: 2019-05-21 18:21:33
Document Modified: 2019-05-21 18:21:33
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