Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Electrical engineering: Wireless liberation

19.09.2011
New ceramic chip antennas offer better performance and reliability for wireless applications using unlicensed spectrum

Wireless devices such as mobile phones rely on the radio spectrum to send and receive data. There is growing interest in using a worldwide unlicensed spectrum around 60 gigahertz for future wireless applications, but conventional ceramic chip antennas have limited performance at this frequency.

Junfeng Xu and Xianming Qing at the A*STAR Institute for Infocomm Research and co-workers have now developed a ceramic chip antenna that exhibits stable performance in this spectrum. The antenna has a relatively wide bandwidth of 17.1% and a gain of up to 22.1 decibels.

Bandwidth and gain are two of the key indicators for assessing the performance of an antenna. An antenna’s bandwidth specifies the range of frequencies over which its performance does not suffer due to poor impedance matching, and the gain measures the antenna’s ability to convert input power into radiowaves in a specified direction. An ideal antenna must not only be compact and lightweight, but also have a wide bandwidth and high gain, leading to high efficiency.

Conventional antennas have a narrow bandwidth of typically less than 10%, and often require expensive components that present difficult manufacturing challenges, such as embedded air cavities. Instead of re-examining these individual components to improve the performance of the ceramic chip antenna, the researchers focused on three aspects of the overall antenna design.

The design of the radiating elements of the ceramic chip antenna consisted of a compact 8 × 8 cavity array, each made of five vertically stacked layers. The radiating elements alone had a large bandwidth of 23%. The inputs to different portions of the antenna were delivered symmetrically, avoiding distortions in radiation patterns and reductions in bandwidth. The researchers also optimized the connection between an external waveguide at the antenna input and an internal waveguide that delivers the signal to the radiating elements for transmission. The use of an internal waveguide increased the radiative efficiency of the antenna, and the transition element of the connection had a large bandwidth of 19%.

The final size of the constructed antenna was just 47 mm × 31 mm (see image), and a transmission loss of less than 2.5 decibels over an operating bandwidth of 17.1%. The antenna displayed a stable radiation pattern over this operating bandwidth, with a main lobe pointing desirably to the broadside of the antenna. The potential applications of the new ceramic chip include a variety of high-speed and license-free wireless devices, and Xu comments that there are plans to apply the new technology to even higher frequencies above 110 gigahertz.

The A*STAR-affiliated researchers contributing to this research are from the Institute for Infocomm Research.

References

Xu, J., Chen, Z.N., Qing, X. & Hong, W. Bandwidth enhancement for a 60 GHz substrate integrated waveguide fed cavity array antenna on LTCC. IEEE Transactions on Antennas and Propagation 59 826–832 (2011).

Lee Swee Heng | Research asia research news
Further information:
http://www.a-star.edu.sg/
http://www.researchsea.com
http://dx.doi.org/10.1109/TAP.2010.2103018

More articles from Power and Electrical Engineering:

nachricht Researchers pave the way for ionotronic nanodevices
23.02.2017 | Aalto University

nachricht Microhotplates for a smart gas sensor
22.02.2017 | Toyohashi University of Technology

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

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

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Stingless bees have their nests protected by soldiers

24.02.2017 | Life Sciences

New risk factors for anxiety disorders

24.02.2017 | Life Sciences

MWC 2017: 5G Capital Berlin

24.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>