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A novel miniaturized log-periodic dipole array antenna using dynamic scaling factor for RFID application

Published online by Cambridge University Press:  26 November 2017

Pourya Rostami Gooran ,
Gholamreza Karimi  and
Ali Lalbakhsh
Pourya Rostami Gooran
Affiliation:
Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
Gholamreza Karimi
Affiliation:
Department of Electrical Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran
Ali Lalbakhsh*
Affiliation:
Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
*
Corresponding author: A. Lalbakhsh Email: Ali.lalbakhsh@yahoo.com
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Abstract

A novel radio frequency identification antenna based on log-periodic dipole array (LPDA) antenna at 5.8 GHz is presented. The antenna design approach consists of two major steps. Firstly, the conventional primitive method is used to design a traditional LPDA antenna. The antenna structure is then miniaturized and its overall performance significantly improved. Dynamic scaling factor along with uniformly separated elements are introduced in this class of antenna, resulting in a 51.5% length reduction. To improve front-to-back (F/B) ratio a symmetrical folding technique is employed, leading to 21.5 dB F/B ratio for the fabricated prototype. An excellent level of input impedance matching (S11 = −28 dB) is achieved using a well-designed feeding system through a proximity coupling technique. The measured gain of the fabricated prototype is 6.2 dBi, and the overall dimension of the antenna substrate is only 30 × 45 mm2 (0.58λ0 × 0.87λ0).

Keywords

Antenna designModeling and measurementsMicrowave measurements
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 10 , Issue 3 , April 2018 , pp. 345 - 350
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2017 

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