12 research outputs found
IWO-based Synthesis of Log-Periodic Dipole Array
The Invasive Weed Optimization (IWO) is an
effective evolutionary and recently developed method. Due to its
better performance in comparison to other well-known
optimization methods, IWO has been chosen to solve many
complex non-linear problems in telecommunications and
electromagnetics. In the present study, the IWO is applied to
optimize the geometry of a realistic log-periodic dipole array
(LPDA) that operates in the frequency range 800-3300 MHz and
therefore is suitable for signal reception from several RF services.
The optimization is applied under specific requirements,
concerning the standing wave ratio, the forward gain, the gain
flatness and the side lobe level, over a wide frequency range. The
optimization variables are the lengths and the radii of the dipoles,
the distances between them, and the characteristic impedance of
the transmission line that connects the dipoles. The optimized
LPDA seems to be superior compared to the antenna derived
from the practical design procedure
Optimal Wideband LPDA Design for Efficient Multimedia Content Delivery over Emerging Mobile Computing Systems
An optimal synthesis of a wideband Log-Periodic
Dipole Array (LPDA) is introduced in the present study. The LPDA optimization is performed under several requirements concerning the standing wave ratio, the forward gain, the gain flatness, the front-to-back ratio and the side lobe level, over a
wide frequency range. The LPDA geometry that complies with the above requirements is suitable for efficient multimedia content delivery. The optimization process is accomplished by applying a recently introduced method called Invasive Weed Optimization (IWO). The method has already been compared to other evolutionary methods and has shown superiority in solving complex non-linear problems in telecommunications and electromagnetics. In the present study, the IWO method has been chosen to optimize an LPDA for operation in the frequency range
800-3300 MHz. Due to its excellent performance, the LPDA can effectively be used for multimedia content reception over future mobile computing systems
NOTIFICATION !!!
All the content of this special edition is retrieved from the conference proceedings published by the European Scientific Institute, ESI. http://eujournal.org/index.php/esj/pages/view/books The European Scientific Journal, ESJ, after approval from the publisher re publishes the papers in a Special edition
NOTIFICATION !!!
All the content of this special edition is retrieved from the conference proceedings published by the European Scientific Institute, ESI. http://eujournal.org/index.php/esj/pages/view/books The European Scientific Journal, ESJ, after approval from the publisher re publishes the papers in a Special edition
NOTIFICATION !!!
All the content of this special edition is retrieved from the conference proceedings published by the European Scientific Institute, ESI. http://eujournal.org/index.php/esj/pages/view/books The European Scientific Journal, ESJ, after approval from the publisher re publishes the papers in a Special edition
NOTIFICATION !!!
All the content of this special edition is retrieved from the conference proceedings published by the European Scientific Institute, ESI. http://eujournal.org/index.php/esj/pages/view/books The European Scientific Journal, ESJ, after approval from the publisher re publishes the papers in a Special edition
NOTIFICATION!!!
The full content of this special edition is retrieved from the conference proceedings published by the European Scientific Institute, ESI. http://eujournal.org/index.php/esj/pages/view/books The European Scientific Journal, ESJ, after approval from the publisher re publishes the papers in a Special edition
NOTIFICATION !!!
All the content of this special edition is retrieved from the conference proceedings published by the European Scientific Institute, ESI. http://eujournal.org/index.php/esj/pages/view/books The European Scientific Journal, ESJ, after approval from the publisher re publishes the papers in a Special edition