Optimal Wideband LPDA Design for Efficient Multimedia Content Delivery Over Emerging Mobile Computing Systems

Abstract

Abstract-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.

Comparison of evolutionary algorithms for LPDA antenna optimization

“…The evolutionary optimization algorithms compared in this study are Invasive Weed Optimization (IWO) [ Li et al ., ; Sedighy et al ., ; Mallahzadeh et al ., ; Pal et al ., ; Zaharis et al ., ; Lazaridis et al ., ], Adaptive IWO (ADIWO) [ Zaharis et al ., , , ], Particle Swarm Optimization (PSO) [ Pantoja et al ., ; Golubovic and Olcan , ; Aziz‐ul‐Haq et al ., ; Zaharis et al ., , ], Differential Evolution (DE) [ Kampitaki et al ., ], and Taguchi. In order to compare the results of each optimization algorithm, the algorithms were applied to an LPDA antenna for the UHF‐TV band (470–790 MHz) with 10 dipoles and a rear shorting stub.…”

Optimization of log-periodic dipole antenna with LTE band-rejection

“…Generally, an LPDA consists of a couple of cuboidal tubular longitudinal support, also known as "boom", that may or may not be parallel to one another (The boom may also converge towards the front end of the antenna). The boom consists of rod-shaped elements, also known as half-dipoles, arranged in a cross-wise fashion attached to boom with appropriate spacing so that a change in phase is observed in the feeding source of two consecutive dipoles [9][10]. If the first half-dipole is constrained to the upper boom, then the other half-dipole will be constrained to the lower boom but facing in opposite direction with the same distance from the front or rear end of the cradle, such that the combination of these two half-dipoles is treated as a dipole of the antenna [9].…”

“…The layout of dipoles of LPDA is in such a fashion that single dipole of the antenna resonates at a particular frequency. Subsequently, different signals transmitted by different dipoles to both the cradles are treated as a combined signal, thereby fixing the operating band of antenna [8][9][10][11][12]. In general, the half-angular sector or the apex angle to which all the dipole elements of LPDA are confined, is mathematically defined as:…”

Measurement, simulation and optimization of wideband log-periodic antennas

“…The dipoles of the LPDA are connected to the source in such a way that a phase reversal is obtained between consecutive dipoles [6]. The relations of proportion between the lengths of the dipoles, the diameter of the dipoles and the spacing between the dipoles is written as:…”

“…In some designs, a constant diameter dipoles are used in order to lower the cost, [7]. The value of τ and σ can be chosen by the user to design the antenna with specific radiation characteristics by using appropriate graphs [3][4][5][6][7][8].…”