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Abstract
This paper comes with a new design of dual-band microstrip slot antenna with two inverted L-shaped slots inserted on the radiating patch, suitable for Radio Frequency Identification (RFID) readers and it operates at 915 MHz and 2.45 GHz. This designed structure permit to achieve good performances in term of return loss radiation pattern and efficiency for the desired frequency bands. The simulation results were carried out by using ADS and CST Microwave Studio electromagnetic solvers. The proposed antenna has a total area of 48·47 mm2 and mounted on an FR4 substrate with dielectric permittivity constant 4.4, thickness of 1.6 mm and loss tangent of 0.025. The design considerations for achieving dual-band antenna and both experimental, simulated results are presented.
Keywords: antenna, RFID (Radio Frequency Identification), microstrip fed, dual-frequency operation, slot antenna, L-shaped slot.
Copyright © 2018 Universitas Ahmad Dahlan. All rights reserved.
1.Introduction
In the recent years radiofrequency identification (RFID) has been widely deployed for a wide range of applications such logistics, supply chain management system and shop security [1]; hence RFID technology tends to replace the old techniques such barcode and smart cards [2].
Generally, an RFID system is composed of a transponder (tag) and a reader. The RFID reader transmits the RF power with an interrogation signal through the antenna to the tag and receives the backscattered signal from the tag, this signal contains the data stored in the microchip integrated in the tag. The block diagram of RFID system is shown in Figure 1.
Diverse frequency bands have been allocated for RFID technology. The Low-frequency (LF, 125-134 kHz) and high-frequency (HF, 13.56 MHz) which provide a low data rate and short reading ranges. RFID systems at Ultra-high frequency (UHF, 860-960 MHz) and microwave (2.4 GHz and 5.8 GHz) offering high data rate and high reading range [3-4]. To meet this requirements, the antenna as one of the sensitive components in the RFID reader that affect the performance of whole RFID system [5-6] has been paid a great attention especially for applications involving RFID handheld reader. In order to provide small and compact wireless devices the need for small antenna that can be integrated while providing acceptable overall performance become an important criteria, hence microstrip patch antennas are considered a good...