3-D printing method advances electrically small antenna design

Mar 16, 2011
This is an optical image of an antenna during the printing process. Credit: Jennifer A. Lewis

Omnidirectional printing of metallic nanoparticle inks offers an attractive alternative for meeting the demanding form factors of 3-D electrically small antennas. This is the first demonstration of 3-D printed antennas on curvilinear surfaces.

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 the University of Illinois at Urbana-Champaign. "However, these fabrication techniques are limited in both 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 of the March 18 issue of ("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 designs.

This is postdoctoral researcher Jacob Adams with principle investigators Jennifer Bernhard and Jennifer Lewis. Credit: Rick Kubetz, Engineering Communications Office

"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 μm 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.

Explore further: Greater safety and security at Europe's train stations

Provided by University of Illinois College of Engineering

4.3 /5 (3 votes)

Related Stories

Printed origami offers new technique for complex structues

Apr 14, 2010

Although it looks small and unassuming, the tiny origami crane sitting in a sample dish in University of Illinois professor Jennifer Lewis' lab heralds a new method for creating complex three-dimensional structures ...

Universal ink for microcontact printing

Jun 01, 2006

"Printing" on the micrometer scale is the technology of the future for the production of the electronic components used for such things as flat-screen monitors or (bio)sensors.

Recommended for you

Greater safety and security at Europe's train stations

18 hours ago

When a suspicious individual fleas on a bus or by train, then things usually get tough for the police. This is because the security systems of the various transportation companies and security services are ...

Fingerprints for freight items

18 hours ago

Security is a top priority in air freight logistics but screening procedures can be very time consuming and costly. Fraunhofer researchers intend to boost efficiency with a new approach to digital logistics, ...

On the way to a safe and secure smart home

18 hours ago

A growing number of household operations can be managed via the Internet. Today's "Smart Home" promises efficient building management. But often the systems are not secure and can only be retrofitted at great ...

DIY glove-based tutor indicates muscle-memory potential

Aug 31, 2014

A senior editor at IEEE Spectrum worked on a DIY project that enabled his 11-year-old son to improve his touch typing by use of a vibrating glove. His son was already "pretty quick on the keyboard," said ...

User comments : 3

Adjust slider to filter visible comments by rank

Display comments: newest first

TabulaMentis
not rated yet Mar 16, 2011
This tech sounds like the forerunner to something really big in the relative short future.
redrooster
not rated yet Mar 16, 2011
is it just me? or do other people find an advert in the middle of an article they are reading ill-mannered? I find it breaks my train of thought. Then I think what a crap site this is to allow this to happen.
trucksmart
not rated yet Mar 17, 2011
Why do you think you get this rag for free?
I'm waiting for somebody to invent a virtual antenna that works better than an antenna array.