International Journal of Electrical and Computer Engineering (IJECE) Vol. 12, No. 1, February 2022, pp. 392~398 ISSN: 2088-8708, DOI: 10.11591/ijece.v12i1.pp392-398  392 Journal homepage: http://ijece.iaescore.com Increasing radiation power in half width microstrip leaky wave antenna by using slots technique Muhannad Kaml Abdulhameed 1 , Sarah Rafil Hashim 2 , Noor Kamil Abdalhameed 3 , Ahmed Jamal Abdullah Al-Gburi 4 1 Information Technology Department, University of Kerbala, Karbala, Iraq 2 Faculty of Education, Al-Zahraa University for Women, Karbala, Iraq 3 Faculty of Medicine, University of Warith Al-Anbiyaa, Karbala, Iraq 4 Faculty of Electronics and Computer Engineering, Universiti Teknikal Malaysia Melaka (UTeM) Durian Tunggal, Melaka, Malaysia Article Info ABSTRACT Article history: Received Mar 18, 2021 Revised Jun 18, 2021 Accepted Jun 29, 2021 The radiation power in the endfire is decreased while the main beam of half substrate integrated waveguide scan from broadside to endfire in a forward. The design of half-width microstrip leaky-wave antenna (HW-MLWA) has been presented in this work to increase the power radiation near endfire by using the slots technique in the radiation element. This slot leads to a decrease the cross-polarization. The proposed design comprises one element of HW- MLWA with repeated meandered square slots in the radiation element. One aspect of this antenna is generated by using a half substrate integrated waveguide with a full tapered feed line. The proposed antenna was terminated by load of 50 Ω, and feed on the other end of the antenna. Finally, the suggested design is simulated and acceptable results were found. The released gain is increased from 10.6 dBi to 12 dBi at 4.3 GHz. This design is suitable for unmanned aerial vehicle UAVs at C band application. Keywords: Cross-polarization HW-MLWA LWA Radiation power Slots technique This is an open access article under the CC BY-SA license. Corresponding Author: Muhannad Kaml Abdulhameed Department of Information Technology, College of Computer Science and Information Technology University of Kerbala Karbala, Iraq Email: muhannad.k@uokerbala.edu.iq 1. INTRODUCTION The invention of microwave technology related to linear leaky wave antennas can be used in radio engineering systems, including air traffic control systems, communications, radar, and radio navigation, based on both stationary and mobile objects, including aircraft. The first idea of leaky-wave antenna (LWA) introduced in 1978 with explaining the first higher-order mode for electromagnetic wave [1]-[3]. The planner low-profile antenna structure depending on the half-width microstrip leaky-wave antenna, become an attractive best choice for the researchers [4], [5]. The half-width microstrip leaky-wave antenna (HW-MLWA) is suitable for most applications, for example, point to multipoint communications, automotive aircraft radar. Most of the radiation leaky-wave antenna has been controlled by varying the operation frequency deadening of the frequency bands [6]-[8]. The direction of the beam scanning is directed by changing the operation frequency. The equation of the direct beam steering of the leaky-wave antenna is assumed by [9], [10]. Where θ(f) is the broadside angle, ko is the wavenumber, and β is defined as the phase constant. So, the varying of the effective phase constant lead to varying of the main beam because of the change in the reactance of profile antenna [11]-[13]. () =  −1 [ ()   () ] (1)