www.astesj.com 496 Omni-directional Dual-Band Patch Antenna for the LMDS and WiGig Wireless Applications Mourad S. Ibrahim 1,2,* 1 Department of Communications and Networks Engineering, College of Engineering, Prince Sultan University, Riyadh, 11586, KSA 2 College of Engineering, Modern Sciences and Arts University, 6 th October City. Egypt. A R T I C L E I N F O A B S T R A C T Article history: Received: 20 September, 2018 Accepted: 16 November, 2018 Online: 23 December, 2018 In this paper an omnidirectional dual band monopole antenna at 28 GHz and 60 GHz which is fit for indoor and outdoor wireless applications is developed. The proposed antenna consists of two rectangular patches with a T folded patch. The design, analysis, and optimization processes through this article are executed by the numerical method, Finite Element Method (FEM) and verified with another numerical method, Finite integration Technique (FIT). Good agreement between the results by these two simulators is obtained. The proposed antenna has achieved dual bands with omnidirectional patterns. The first band at 28 GHz is extended from 27.5 GHz to 28.958 GHz with 5.1 % bandwidth and total efficiency of more than 93% along the entire band which serves the LMDS band. The second band at 60 GHz is extended from 45.2 GHz to 84.4 GHz which serves the WiGig band with bandwidth of 60.6% and total efficiency of 85.5% along the entire band. The proposed antenna performance makes it a good candidate for the fifth generation (5G) applications. Keywords: Dual band Fifth generation LMDS Omnidirectional pattern WiGig 1. Introduction This paper is an extension of work originally presented in ACES [1]. More analysis and parametric studies have been done. The average data per person uses in telecommunication is rapidly increases over the past three decades [2]. This increase is more noticeable mostly with the outgrowth of the wireless communications. The main requirements for wireless communications are the ability to develop a low-cost, light-weight, and low-profile antennas to maintain good performance along a large bandwidth [2]. The shortage in the available global bandwidth has stimulated the reconnaissance of the under-utilized millimeter wave frequency band for the future wireless communications [3]. Multiband antennas have massive applications in millimeter band applications. A various techniques in the literature have been developed for multiband microstrip antennas as in [4–12]. For instance, a multilayer GaAs is described in [4] to achieve a multiband antenna operating at 35 GHz. In [5], two bands with less than 1.2% bandwidth with gains of -9 dBi and 1 dBi at 24 GHz band and 60 GHz band respectively is presented. A dual band antenna at 41 GHz / 52.2 GHz using a meta-resonator with pair of split ring resonators is introduced in [6] with bandwidth of 2 %, gain of 3.76 dBi, and efficiency of 71%. In [7], two different modes are obtained to get a dual band at 58 GHz and 77 GHz with gains of -2 dBi and 0.3 dBi, respectively. The achieved bandwidths at both bands are nearly 6%. A dual band centered at 24.5 and 35 GHz has been presented in [8] with only 1% bandwidth and less than 2.8 dBi gain using liquid crystal polymer. A coplanar hybrid dual band antenna at 83 GHz / 94 GHz with a slot in feeding line has been developed in [9]. In [10] an antenna array with Electromagnetic Band Gap [EBG] structure was used to develop a dual band at 28 / 38 GHz with bandwidth of less than 5.8%. A three layers of substrates have been used in [11] to design a Fabry-Perot cavity antenna operates at 36 GHz with high gain. In [12], L- shaped slots have been used to obtain a dual band 28 / 38 GHz slotted patch antenna. In this paper, the design, optimization, and simulation of a monopole planar antenna are introduced. The antenna is optimized to operate at Ka _ band (28 GHz) for Local Multipoint Distribution Service (LMDS) which currently investigated for the fifth generation mobile cellular [13], and the V _ band (60 GHz) for Wireless Gigabit Alliance (WiGig) applications [14]. This paper is organized into four sections. Section 1 covers the introduction and literature review. Antenna structure and design is introduced in section 2. Parametric study of a dual band ASTESJ ISSN: 2415-6698 *Mourad S. Ibrahim, Riyadh 11586, mrizk@psu.edu.sa Advances in Science, Technology and Engineering Systems Journal Vol. 3, No. 6, 496-500 (2018) www.astesj.com Special Issue on Recent Advances in Engineering Systems https://dx.doi.org/10.25046/aj030658