Subscribe to our free daily newsletters
  Space Travel 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
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
Time Is Now For Human Mission To Mars

Time Is Now For Human Mission To Mars

Color View From Orbit Shows Mars Rover Beside Crater

Testing Mars Missions In Morocco

CHIP TECH
Goddard's Chief Scientist Talks About The 'Supermoon' Phenomenon

A 'Supermoon' Did Not Cause The Japanese Earthquake

LRO Images Lunar Farside In Stunning Detail

Astrobotic's Mission To The Moon Releases Guide For Payload Developers

CHIP TECH
Can WISE Find The Hypothetical Tyche In Distant Oort Cloud

Theory: Solar system has another planet

Launch Plus Five Years: A Ways Traveled, A Ways To Go

CHIP TECH
Report Identifies Priorities For Planetary Science 2013-2022

Planetary Society Statement On Planetary Science Decadal Survey For 2013-2022

Meteorite Tells Of How Planets Are Born In A Swirl Of Dust

Planet Formation In Action

CHIP TECH
SpaceX Expanding Texas Operations

Andrews Space Awarded USAF Reusable Booster System Study Contract

World's Largest Rocket Production Base Takes Shape In North China

SwRI Signs Up For 8 Reusable Suborbital Launches

CHIP TECH
What Future for Chang'e-2

China setting up new rocket production base

China's Tiangong-1 To Be Launched By Modified Long March II-F Rocket

China Expects To Launch Fifth Lunar Probe Chang'e-5 In 2017

CHIP TECH
ESA Remembers The Night Of The Comet

Vesta - An Asteroid In 3D

Dawn Gets Vesta Target Practice

Hawaii Astronomers Keep Tabs On Asteroid Apophis


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