Design and Optimization of Wideband Log-Periodic Dipole Arrays under Requirements for High Gain, High Front-to-Back Ratio, Optimal Gain Flatness, and Low Side Lobe Level: The Application of Invasive Weed

Zaharias D. Zaharis, Pavlos I. Lazaridis, Christos Skeberis, George Mastorakis, Constandinos X. Mavromoustakis, Evangelos Pallis, Dimitrios I. Stratakis, Thomas D. Xenos

Research output: Chapter in Book/Report/Conference proceedingChapter

1 Citation (Scopus)

Abstract

The design and optimization of wideband log-periodic dipole arrays (LPDAs) are presented in this chapter. The LPDAs are expected to simultaneously satisfy several requirements inside a wide operating frequency range. In particular, the optimized LPDA has to provide standing wave ratio (SWR) below a predefined value, gain values as high as possible, gain flatness (GF) below a desired value, both side lobe level (SLL) and front-to-back ratio (FBR) below a desired value, and all these requirements must be satisfied at the same time inside the entire frequency range of operation. Since the design problem is nonlinear and inherently multiobjective, the simultaneous realization of all the above requirements can only be achieved by applying global optimization algorithms. These algorithms are usually based on evolutionary optimization methods and have been proved to be capable of solving complex nonlinear problems with great success. Such an evolutionary method with high potential in antenna design is presented in this chapter. The method is called invasive weed optimization (IWO) and is applied in conjunction with the method of moments (MoM) to optimize LPDAs under the above-mentioned requirements. The MoM is a well-known full-wave analysis method and is utilized here to extract the radiation characteristics of the LPDA required by the IWO algorithm. Several design cases are studied concerning the LPDA geometry and the operating bandwidth. The derived LPDA geometries exhibit a behavior close to the desired one and therefore are able to enhance the performance of a wireless network in practical applications.

Original languageEnglish
Title of host publicationWireless Network Performance Enhancement Via Directional Antennas
Subtitle of host publicationModels, Protocols, and Systems
EditorsJohn D. Matyjas, Fei Hu, Sunil Kumar
PublisherCRC Press
Chapter2
Pages21-61
Number of pages41
ISBN (Electronic)9781498707541
ISBN (Print)9781498707534
DOIs
Publication statusPublished - 18 Nov 2015
EventLoughborough Antennas & Propagation Conference - Burleigh Court International Conference Centre , Loughborough, United Kingdom
Duration: 13 Nov 201714 Nov 2017
https://events.theiet.org/lapc/about-2017.cfm (Link to Conference Details)

Conference

ConferenceLoughborough Antennas & Propagation Conference
Abbreviated titleLAPC 2017
CountryUnited Kingdom
CityLoughborough
Period13/11/1714/11/17
Internet address

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Zaharis, Z. D., Lazaridis, P. I., Skeberis, C., Mastorakis, G., Mavromoustakis, C. X., Pallis, E., ... Xenos, T. D. (2015). Design and Optimization of Wideband Log-Periodic Dipole Arrays under Requirements for High Gain, High Front-to-Back Ratio, Optimal Gain Flatness, and Low Side Lobe Level: The Application of Invasive Weed . In J. D. Matyjas, F. Hu, & S. Kumar (Eds.), Wireless Network Performance Enhancement Via Directional Antennas: Models, Protocols, and Systems (pp. 21-61). CRC Press. https://doi.org/10.1201/b19065