Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Fractal-shaped tiles developed for new broadband antenna class

20.10.2003


Penn State engineers have developed innovative design methods for a new class of antennas composed of an array of fractal-shaped tiles that offer anywhere from a 4:1 to 8:1 improvement in bandwidth compared to their conventional counterparts.


Douglas H. Werner, professor of electrical engineering and senior scientist, Applied Research Laboratory, Penn State in front of tiles at the Alhambra, Granada, Spain.



Many natural objects, such as tree branches and their root systems, peaks and valleys in a landscape and rivers and their tributaries are versions of mathematical fractals which appear pleasingly irregular to the eye but are actually made of self-similar, repeated units.

The new broadband antennas are composed of irregular but self-similar, repeated fractal-shaped unit tiles or "fractiles" which cover an entire plane without any gaps or overlaps. The outer boundary contour of an array built of fractiles follows a fractal distribution.


Dr. Douglas H. Werner, professor of electrical engineering and senior scientist in Penn State’s Applied Research Laboratory, will describe the new antennas and their generation at the 2003 IEEE AP-S Topical Conference on Wireless Communication Technology, Oct. 16, in Honolulu, Hawaii. His paper is "A New Design Methodology for Modular Broadband Arrays Based on Fractal Tilings." His co-authors are Waroth Kuhirun, graduate student, and Dr. Pingjuan Werner, associate professor of electrical engineering.

While fractal concepts have been used previously in antenna design, Werner and his research team are the first to introduce a design approach for broadband phased array antenna systems that combines aspects of tiling theory with fractal geometry.

Once the specific fractile array has been designed, the Penn State team exploits the fact that fractal arrays are generated recursively or via successive stages of growth starting from a simple initial unit, to develop fast recursive algorithms for calculating radiation patterns. Using the recursive property, they have also developed rapid algorithms for adaptive beam forming, especially for arrays with multiple stages of growth that contain a relatively large number of elements.

Werner says, "The availability of fast beam forming algorithms is especially advantageous for designing smart antenna systems." The Penn State team has also shown that a fractile array made of unit tiles based on the Peano-Gosper curve, for example, offers performance advantages over a similar-sized array with conventional square boundaries. The Peano-Gosper fractile array produces no grating lobes over a much wider frequency band than conventional periodic planar square arrays.

Werner explains that "Grating lobes are sidelobes with the same intensity as the mainbeam. They are undesirable because they take energy away from the main beam and focus it in unintended directions, causing a reduction in the gain of an antenna array." The University is patenting the team’s approach to Peano-Gosper and related fractile arrays. The team has also been awarded a grant through the Applied Research Laboratory to build and test a prototype.

Barbara Hale | EurekAlert!
Further information:
http://www.psu.edu/

More articles from Communications Media:

nachricht New Technologies for A/V Analysis and Search
13.04.2017 | Fraunhofer-Institut für Digitale Medientechnologie IDMT

nachricht On patrol in social networks
25.01.2017 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO

All articles from Communications Media >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Antarctic landscape insights keep ice loss forecasts on the radar

20.11.2017 | Earth Sciences

Filling the gap: High-latitude volcanic eruptions also have global impact

20.11.2017 | Earth Sciences

Water world

20.11.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>