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

Pourya Rostami Gooran, Gholamreza Karimi, Ali Lalbakhsh*

*Corresponding author for this work

Research output: Contribution to journalArticle


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).

Original languageEnglish
Pages (from-to)345-350
Number of pages6
JournalInternational Journal of Microwave and Wireless Technologies
Issue number3
Publication statusPublished - Apr 2018
Externally publishedYes



  • Antenna design
  • Modeling and measurements
  • Microwave measurements

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