{"id":8508,"date":"2011-07-12T18:55:54","date_gmt":"2011-07-12T22:55:54","guid":{"rendered":"http:\/\/rbach.net\/blog\/?p=8508"},"modified":"2022-08-19T20:10:30","modified_gmt":"2022-08-20T00:10:30","slug":"put-a-hemi-in-your-mobile-phone","status":"publish","type":"post","link":"https:\/\/rbach.net\/index.php\/put-a-hemi-in-your-mobile-phone\/","title":{"rendered":"Put a Hemi in Your Mobile Phone"},"content":{"rendered":"

\"PutResearchers at the University of Michigan<\/a> have found a way to put a hemi into your next mobile phone. While it is not the legendary MOPAR<\/a> Hemi engine<\/a>, it is a hemispherical antenna. U of M researchers have figured out how to mass-produce antennas so small that they approach the fundamental minimum size limit for their bandwidth, or data rate, of operation according<\/a> to the U of M News Service<\/a><\/em>.<\/p>\n

\"University<\/a>The antenna is typically the largest wireless component in mobile devices. Shrinking it could leave more room for other gadgets and features, Anthony Grbic<\/a>, an associate professor in the Department of Electrical Engineering and Computer Science<\/a> said.<\/p>\n

Mr. Grbic and Stephen Forrest<\/a>, a professor in the departments of Materials Science and Engineering<\/a> and Physics<\/a>, led the development of the hemisphere-shaped antennas, which can be manufactured with innovative imprint processing techniques that are rapid and low-cost. The finished product is 1.8 times the fundamental antenna size limit established in 1948 by L.J. Chu. The dimensions of this limit vary based on an antenna\u2019s bandwidth.<\/p>\n

\"U<\/a>\u201cEver since the Chu limit was established, people have been trying to reach it<\/em>,\u201d Mr. Grbic said in the article. \u201cStandard printed circuit board antennas don\u2019t come close. Some researchers have approached the limit with manually built antennas, but those are complicated and there\u2019s no efficient way to manufacture them. We\u2019ve found a way to cut the antenna\u2019s size while maximizing its bandwidth, using a process that\u2019s amenable to mass production<\/em>.\u201d<\/p>\n

The researchers\u2019 prototype operates at 1.5 gigahertz, in the frequency range of Wi-Fi<\/a> devices as well as cordless and mobile phones. The antenna is 70 percent efficient and ten times smaller than conventional antennas, Mr. Grbic said. It has three times the conductivity of similar devices produced by 3-D ink-jet printing techniques, a process that serially writes the antenna geometry.<\/p>\n

\"\"This new method is a very general process, said Carl Pfeiffer, a doctoral student in the Department of Electrical Engineering and Computer Science and first author of a paper on the work, \u201cNovel Methods to Analyze and Fabricate Electrically Small Antennas<\/em>\u201d will be presented at the 2011 IEEE<\/a> International Symposium on Antennas and Propagation.<\/a><\/p>\n

\u201cIt can be used to fabricate antennas that are of a wide variety of sizes, shapes, frequencies, and designs,<\/em>\u201d Mr. Pfeiffer said. \u201cBasically if you tell me the data rate that is required for a particular application, I can make an antenna that does this while at the same time being as small as possible.<\/em>\u201d<\/p>\n

\"Internet<\/a>The prototype was made in the College of Engineering\u2019s Lurie Nanofabrication Facility. The work was funded by the Department of Education\u2019s Graduate Assistance in Areas of National Need program<\/a>, the National Science Foundation<\/a>, and the U.S. Air Force Office of Scientific Research<\/a>.<\/p>\n

The researchers believe this development could lead to new generations of wireless consumer electronics and mobile phones that are either smaller or can perform more functions. Beyond consumer electronics, this work could be useful in wireless sensing and military communications. Wireless sensor networks could be used for environmental monitoring or surveillance.<\/p>\n

rb-<\/em><\/strong><\/p>\n

Like the Chrysler<\/a> Hemi, these new antennas may supercharge mobile phones. The small size could allow multiple antennas to be built into mobile devices allowing MIMO<\/a> connections. The small size should also cut down on the power requirements, decreasing the size of the battery required and increasing the time between charges.<\/em><\/p>\n

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