Indonesian Journal of Electrical Engineering and Computer Science Vol. 23, No. 1, July 2021, pp. 321~329 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v23.i1.pp321-329  321 Journal homepage: http://ijeecs.iaescore.com A novel compact dual band RFID handheld reader antenna for microwave ISM band application Wahiba Belgacem, Miloud Bousahla, Sidi Mohammed Meriah Laboratory of Telecommunications of Tlemcen (LTT), Department of Telecommunications Faculty of Technology, University of Tlemcen, Algeria Article Info ABSTRACT Article history: Received Oct 17, 2020 Revised Mar 28, 2021 Accepted Jun 18, 2021 This paper presents a new design of dual band RFID reader antenna for ISM- band industrial science and medical applications at 2.4 GHz and 5.8 GHz. The antenna is designed and physically built using FR4 substrate and taking a 1.5 thickness, 4.3 relative permittivity and 0.025 loss tangents. Different slots have been introduced to reduce the antenna dimensions and to achieve the dual band for microwave ISM band application. The dimension of the proposed antenna is 34 × 34 × 1.5 mm3, which it could be easily integrated into RFID readers. Numerical simulations have been performed using computer simulation technology (CST) Microwave Studio software. A parametric study was investigated in order to show the effect of slots variation and to obtain the desired functional characteristics. Experimental results show a good agreement with results obtained by simulations. A satisfactorily omnidirectional for the radiation patterns across the antenna operation bands was obtained. Keywords: Computer simulation technology RFID This is an open access article under the CC BY-SA license. Corresponding Author: Wahiba Belgacem Laboratory of Telecommunications of Tlemcen (LTT) Department of Telecommunications Faculty of Technology, University of Tlemcen, Algeria BP 230 - 13000 Chetouane Tlemcen, Algéria Email: belgacem_wahiba@yahoo.fr 1. INTRODUCTION Radio frequency identification (RFID) is a technology automatically encodes or stores digital data into an RFID tags (also known as RFID transponders). RFID transponder is affixed to an object, and which permits to a radio wave device reading or tracking data regarding the object remotely. In contrast to bar-code technology, which requires that codes printed on a label pass in direct view in front of an optical reader to allow the corresponding data to be read, RFID tags can be read without a direct line of sight [1]-[25]. This ease and speed of reading make RFID technology, particularly suitable for a large number of applications where the individual reading of each bar code would slow down the information acquisition process. The RFID system consists of an RFID tag that contains an integrated circuit connected to an antenna and encapsulated in a protective bracket, which depends on the needs of the intended application and an RFID reader is a receiver, transmitter controlled by a microprocessor or a digital signal processor. Using an antenna to which it is connected, the reader “captures” the data stored in the tags and then transmits it to a computer for processing [1]. Many operating frequencies have been assigned to the RFID systems, there are the low-frequency (LF) around 125 KHz, the high-frequency (HF) around 13.56 MHz, the ultra-high-frequency (UHF) from 860 MHz to 960 MHz and the microwave band (MW) around 2.45 GHz or 5.8 GHz. The important components in the RFID system are the reader and tag antenna, and their capability determines the