Subscribe to our free daily newsletters
  Space Industry and Business News  




Subscribe to our free daily newsletters



CHIP TECH
3D Printing Method Advances Electrically Small Antenna Design

Postdoctoral researcher Jacob Adams with principle investigators Jennifer Bernhard and Jennifer Lewis.
by Staff Writers
Chicago IL (SPX) Mar 18, 2011
While most electronic components benefit from decreased size, antennas-whether in a cell phone or on an aircraft-suffer limitations in gain, efficiency, system range, and bandwidth when their size is reduced below a quarter-wavelength.

"Recent attention has been directed toward producing antennas by screen-printing, inkjet printing, and liquid metal-filled microfluidics in simple motifs, such as dipoles and loops," explained Jennifer T. Bernhard, a professor of electrical and computer engineering at Illinois.

"However, these fabrication techniques are limited in both spatial resolution and dimensionality, yielding planar antennas that occupy a large area relative to the achieved performance."

"Omnidirectional printing of metallic nanoparticle inks offers an attractive alternative for meeting the demanding form factors of 3D electrically small antennas (ESAs)," stated Jennifer A. Lewis, the Hans Thurnauer Professor of Materials Science and Engineering and director of the Frederick Seitz Materials Research Laboratory at Illinois.

"To our knowledge, this is the first demonstration of 3D printed antennas on curvilinear surfaces," Lewis stated. The research findings and fabrication methods developed by Bernhard, Lewis, and their colleagues are featured in the cover article,"Illinois Calling" of the March 18 issue of Advanced Materials ("Conformal Printing of Electrically Small Antennas on Three-Dimensional Surfaces").

According to Bernhard, these antennas are electrically small relative to a wavelength (typically a twelfth of a wavelength or less) and exhibit performance metrics that are an order of magnitude better than those realized by monopole antenna designs.

"There has been a long-standing problem of minimizing the ratio of energy stored to energy radiated-the Q-of an ESA," Bernhard explained. "By printing directly on the hemispherical substrate, we have a highly versatile single-mode antenna with a Q that very closely approaches the fundamental limit dictated by physics (known as the Chu limit).

Conformal printing allows the antenna's meander lines to be printed on the outside or inside of hemispherical substrates, adding to its flexibility.

"Unlike planar substrates, the surface normal is constantly changing on curvilinear surfaces, which presents added fabrication challenges," Lewis noted. To conformally print features on hemispherical substrates, the silver ink must strongly wet the surface to facilitate patterning even when the deposition nozzle (100 m diameter) is perpendicular to the printing surface.

To fabricate an antenna that can withstand mechanical handling, for example, the silver nanoparticle ink is printed on the interior surface of glass hemispheres.

Other non-spherical ESAs can be designed and printed using a similar approach to enable integration of low Q antennas on, for example, the inside of a cell phone case or the wing of an unmanned aerial vehicle.

The antenna's operating frequency is determined primarily by the printed conductor cross-section and the spacing (or pitch) between meander lines within each arm.

According to the researchers, their design can be rapidly adapted to new specifications, including other operating frequencies, device sizes, or encapsulated designs that offer enhanced mechanical robustness.

"This conformal printing technique can be extended other potential applications, including flexible, implantable, and wearable antennas, electronics, and sensors," Lewis said.



Share This Article With Planet Earth
del.icio.usdel.icio.us DiggDigg RedditReddit
YahooMyWebYahooMyWeb GoogleGoogle FacebookFacebook



Related Links
Frederick Seitz Materials Research Laboratory
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com



Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News


CHIP TECH
Taiwan's UMC to triple stake China chip maker
Taipei (AFP) March 17, 2011
Taiwan's United Microelectronics Corp, the world's second biggest contract microchip maker, plans to triple its stake in Chinese chip producer Hejian Technology to 45 percent, officials said Thursday. UMC plans to spend $87 million on the deal, which will give it 30 percent of the shares in Hejian on top its existing 15 percent holding, the Taiwanese company said in a statement. The deal ... read more







CHIP TECH
Apple could face iPad 2 component shortages

Radiation levels in Japan not harmful: IAEA

Six workers exposed to high radiation at Japan plant

Indonesia screens Japan travellers for radiation

CHIP TECH
Advanced Emulation Accelerates Deployment Of Military Network Technologies

Tactical Communications Group Completes Deployment Of Ground Support Systems

Raytheon Announces Next Generation of ACU Interoperable Communications

InterSKY 4M Provides BLOS Comms For C4I Military Systems

CHIP TECH
Ariane 5 Moves To Final Assembly Building

NASA Unveiling New Rocket Integration Facility At Wallops

Falcon 9 To Launch SES-8 To GTO In 2013

SES gives SpaceX first geostationary satellite launch deal

CHIP TECH
N. Korea rejects Seoul's plea to stop jamming signals

Rayonier's GIS Strengthens Asset Management Capability

Space Team Improves GPS Capability For Warfighters

SSTL's European GNSS Payload Passes Design Review

CHIP TECH
IATA sees sharp slowdown in Japan air traffic

Rolls-Royce forecasts helicopter boom

Flights to Japan cut as foreigners scramble to leave

Air China, Taiwan's EVA cut back Japan flights

CHIP TECH
Silicon Spin Transistors Heat Up And Spins Last Longer

3D Printing Method Advances Electrically Small Antenna Design

Taiwan's UMC to triple stake China chip maker

NIST Electromechanical Circuit Sets Record Beating Microscopic Drum

CHIP TECH
NASA Satellites Show Towering Thunderstorms

NASA Satellite Sees Area Affected By Japan Tsunami

National Flooding Exercise Hones Use Of Satellites To Improve Disaster Mitigation

Mapping Japan's Changed Landscape From Space

CHIP TECH
EPA proposes 1st mercury emissions limits

Russian police search office of outspoken activist

China cleaning up 'jeans capital'

Environmental Impact Of Animal Waste


The content herein, unless otherwise known to be public domain, are Copyright 1995-2010 - SpaceDaily. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by SpaceDaily on any Web page published or hosted by SpaceDaily. Privacy Statement