A novel miniaturized log-periodic dipole array antenna using dynamic scaling factor for RFID application. Issue 3 (26th November 2017)

• Record Type: Journal Article
• Authors: Rostami Gooran, Pourya; Karimi, Gholamreza; Lalbakhsh, Ali
• Is Part Of: International journal of microwave and wireless technologies. Volume 10:Issue 3(2018)
• Page Start: 345
• Page End: 350
• Publication Date: 2017-11-26
• Subjects: Antenna design, -- Modeling and measurements, -- Microwave measurements; Wireless communication systems -- Periodicals; Microwave circuits -- Periodicals; Radio frequency -- Periodicals; 621.381305
• DOI: 10.1017/S1759078717001246
• Languages: English
• ISSNs: 1759-0787

Abstract

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 ( S 11 = −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 mm 2 (0.58 λ 0 × 0.87 λ 0).