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Compact antennas are a subject of growing interest from industry and scientific community to equip wireless communicating objects. The need for high performance small antennas and RF front ends is the challenge for future and next generation mobile devices. This book brings the body of knowledge on compact antennas into a single comprehensive volume. It is designed to meet the needs of electrical engineering and physics students to the senior undergraduate and beginning graduate levels, and those of practicing engineers.

Cell phones. --- Cell telephones --- Cellphones --- Cellular phones --- Cellular radio --- Cellular telephones --- Mobile phones --- Mobiles (Telephones) --- Phones, Cell --- Telephones, Cell --- Wireless phones --- Radio --- Telephone --- Transmitter-receivers --- WAP (wireless) technology

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Wireless communication systems --- Cell phones --- Cell telephones --- Cellphones --- Cellular phones --- Cellular radio --- Cellular telephones --- Mobile phones --- Mobiles (Telephones) --- Phones, Cell --- Telephones, Cell --- Wireless phones --- Radio --- Telephone --- Transmitter-receivers

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As nations race to hone contact-tracing efforts, the world's experts consider strategies for maximum transparency and impact.As public health professionals around the world work tirelessly to respond to the COVID-19 pandemic, it is clear that traditional methods of contact tracing need to be augmented in order to help address a public health crisis of unprecedented scope. Innovators worldwide are racing to develop and implement novel public-facing technology solutions, including digital contact tracing technology. These technological products may aid public health surveillance and containment strategies for this pandemic and become part of the larger toolbox for future infectious outbreak prevention and control. As technology evolves in an effort to meet our current moment, Johns Hopkins Project on Ethics and Governance of Digital Contact Tracing Technologies-a rapid research and expert consensus group effort led by Dr. Jeffrey P. Kahn of the Johns Hopkins Berman Institute of Bioethics in collaboration with the university's Center for Health Security-carried out an in-depth analysis of the technology and the issues it raises. Drawing on this analysis, they produced a report that includes detailed recommendations for technology companies, policymakers, institutions, employers, and the public. The project brings together perspectives from bioethics, health security, public health, technology development, engineering, public policy, and law to wrestle with the complex interactions of the many facets of the technology and its applications.This team of experts from Johns Hopkins University and other world-renowned institutions has crafted clear and detailed guidelines to help manage the creation, implementation, and application of digital contact tracing. Digital Contact Tracing for Pandemic Response is the essential resource for this fast-moving crisis.Contributors: Joseph Ali, JD; Anne Barnhill, PhD; Anita Cicero, JD; Katelyn Esmonde, PhD; Amelia Hood, MA; Brian Hutler, Phd, JD; Jeffrey P. Kahn, PhD, MPH; Alan Regenberg, MBE; Crystal Watson, DrPH, MPH; Matthew Watson; Robert Califf, MD, MACC; Ruth Faden, PhD, MPH; Divya Hosangadi, MSPH; Nancy Kass, ScD; Alain Labrique, PhD, MHS, MS; Deven McGraw, JD, MPH, LLM; Michelle Mello, JD, PhD; Michael Parker, BEd (Hons), MA, PhD; Stephen Ruckman, JD, MSc, MAR; Lainie Rutkow, JD, MPH, PhD; Josh Sharfstein, MD; Jeremy Sugarman, MD, MPH, MA; Eric Toner, MD; Mar Trotochaud, MSPH; Effy Vayena, PhD; Tal Zarsky, JSD, LLM, LLB.

Cell phones. --- Contact tracing (Epidemiology) --- Medical policy --- Tracing, Contact (Epidemiology) --- Epidemiology --- Medicine, Preventive --- Cell telephones --- Cellphones --- Cellular phones --- Cellular radio --- Cellular telephones --- Mobile phones --- Mobiles (Telephones) --- Phones, Cell --- Telephones, Cell --- Wireless phones --- Radio --- Telephone --- Transmitter-receivers --- Public aspects of medicine

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One-fifth of the world's population lives in countries affected by fragility, violence and conflict, impeding long-term economic growth. However, little is known about how firms respond to local changes in security, partly because of the difficulty of measuring firm activity in these settings. This paper presents a novel methodology for observing private sector activity using mobile phone metadata. Using Afghanistan as the empirical setting, the analysis combines mobile phone data from over 2,300 firms with data from several other sources to develop and validate measures of firm location, size, and economic activity. Combining these new measures of firm activity with geocoded data on violent events, the paper investigates how the private sector in Afghanistan responds to insecurity. The findings indicate that firms reduce presence in districts following major increases in violence, that these effects persist for up to six months, and that larger firms are more responsive to violence. The paper concludes with a discussion of potential mechanisms, firms' strategic adaptations, and implications for policymakers.

Armed Conflict --- Conflict --- Conflict and Development --- Economic Growth --- Economic Theory & Research --- Industrial Economics --- Industrial Organization --- Insecurity --- Marketing --- Mobile Phones --- Private Sector Development --- Private Sector Development Law --- Private Sector Economics --- Social Development --- Technology Industry --- Technology Innovation --- Violence

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Telemarketing --- Cell phones --- Commerce --- Marketing & Sales --- Business & Economics --- Cell telephones --- Cellphones --- Cellular phones --- Cellular radio --- Cellular telephones --- Mobile phones --- Mobiles (Telephones) --- Phones, Cell --- Telephones, Cell --- Wireless phones --- Electronic marketing --- Telephone marketing --- E-books --- Radio --- Telephone --- Direct marketing --- Telematics --- Telephone selling --- Transmitter-receivers