Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

A Reconfigurable Antenna Array (RAA) integrated with RF Switches

08.11.2013
The recent rapid development of wireless communication systems has created a strong need for the development of new antenna structures. The research described in this project introduces the concept of reconfigurable antennas with switching beam control, operable at 5.8 GHz.

Reconfigurable antennas are very attractive for modern wireless communications because they allow the use of a single antenna for multiple systems. The research described in this project introduces the concept of reconfigurable antennas with switching beam control, operable at 5.8 GHz.

In this project, a new reconfigurable antenna design was proposed; namely a Reconfigurable Antenna Array (RAA). In the RAA configuration, the behavior of the reconfigurable multiple element linear antenna array system has been investigated with respect to the beam shaping characteristics. Two different beam patterns were achieved by reconfigure the number of patches element.

RAA for different area coverage

A completed project led by Mohd Tarmizi from Universiti Teknologi MARA presented a reconfigurable multiple element micro strip rectangular linear array antennas integrated with radio frequency (RF) switches. Reconfigurable beam shaping is ideal for the detection of small and large targets at both short and long ranges, including where the antenna is mounted on a high tower or hillside. “Reconfigurable antennas have been applied to many military and mobile communication applications where it is necessary to have a single antenna that can be dynamically reconfigured to transmit or receive on same or multiple frequency bands”, says Tarmizi. The development of a new and innovative antenna design is proposed which integrates RF switches to implement beam control in a reconfigurable antenna.

Antenna Design

The team had to involve antenna design, fabrication and measurement in order to develop the optimum type of antenna. The objectives of the project were to study, design and fabricate an innovative RAA with respect of control of beam shape characteristics at a resonant frequency of 5.8GHz. Also to develop and design a Programmable Interface Controller (PIC) power microcontroller circuits that can be used to supply the DC voltage to activate the PIN Diode switch circuits. The simulated and measured results are presented and compared, to demonstrate the performance of the proposed antennas.

The team eventually succeeded in getting a simulation data to demonstrate the concepts of a reconfigurable number of elements that produced broadened beam and narrowed beam radiating pattern characteristics. By using a modified Wilkinson Power Divider (WPD) in the antenna structure, a better performance in terms of return loss was produced. This design solves some of the problems of the original Wilkinson power divider design. The addition of transmission lines in between two quarter-wave transformer arms has been shown to absorb an unwanted wave generated due to mismatch at the switches.

This research has taken advantage of the techniques of flexibly manipulating the number of elements by applying it to the problem of a reconfigurable multiple beam array combination. The reconfigurable dual-beam antenna pattern at fixed frequencies across the entire 5.7-5.9 GHz band is presented as showing excellent radiation patterns. The measured results illustrate that the radiation pattern characteristic of the antenna has been tuned efficiently. Since its structure is symmetrical around the centre, the pattern obtained is directed to è0. The reconfiguration of radiation patterns for four- and eight-element structures at 3 dB half power produced a beamwidth (HPBW) of 290 degrees and 210 degrees respectively. Meanwhile the return losses for both structures were -20.57 dB. The comparison of gain between both reconfigurable modes can be observed from the results: the eight-element mode had 2 dB to 3 dB higher gain compared to the four-element mode. It shows clearly that when the numbers of elements are increased, the beamwidth becomes narrower with lower sidelobe and higher magnitude.

In order to miniature the size of antenna design, the team has been plans to apply a Low Temperature Co-fired Ceramic (LTCC) substrate to replace with current substrate board in the near future.

Contact details of lead researcher(s)

Dr Mohd Tarmizi Ali, Dr Azita Laily and Dr Norsuzila Ya’acob
Microwave Technology Centre (MTC)
Universiti Teknologi MARA (UiTM)
Email: mizi732002@salam.uitm.edu.my

Darmarajah Nadarajah | Research asia research news
Further information:
http://www.uitm.edu.my
http://www.researchsea.com

More articles from Information Technology:

nachricht First machine learning method capable of accurate extrapolation
13.07.2018 | Institute of Science and Technology Austria

nachricht A step closer to single-atom data storage
13.07.2018 | Ecole Polytechnique Fédérale de Lausanne

All articles from Information Technology >>>

The most recent press releases about innovation >>>

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

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Research finds new molecular structures in boron-based nanoclusters

13.07.2018 | Materials Sciences

Algae Have Land Genes

13.07.2018 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>