Turk J Elec Eng & Comp Sci () : – c  T ¨ UB ˙ ITAK doi:10.3906/elk- Compact metal-plate slotted WLAN-WIMAX antenna design with usb Wi-Fi 1 adapter application 2 Cem BAYTORE 1,2* , Cem GOCEN 2 , Merih PALANDOKEN 2 , Adnan KAYA 2 , E. Ye¸ sim ZORAL 1 1 The Graduate School of Natural and Applied Sciences, Dokuz Eylul University, Izmir, Turkey 2 Electrical and Electronic Engineering Department, Engineering Faculty, Izmir Katip Celebi University, Izmir, Turkey Received: .201 • Accepted/Published Online: .201 • Final Version: ..201 3 Abstract: In this study, a compact antenna design, which operates in the 2.4, 5.2, 5.8 GHz (WLAN), and 3.5, 5.5 GHz 4 (WiMAX) frequency bands, has been implemented to be compatible with the 802.11.ac/n standards. Proposed metal 5 antenna is made of a copper plate of thickness 0.5 mm with a compact overall physical sizes 20 mm × 30 mm. Although 6 it is low proﬁle, it can work with high eﬃciency because it has a cheap planar metal structure and it does not contain any 7 expensive dielectric material. The antenna is investigated in terms of S parameters, input impedance, eﬃciency, surface 8 current distributions, and radiation pattern. After all, the implemented antenna has been used in a USB-WiFi adapter 9 design for a desktop computer as an indoor WLAN application. The protector outer jacket of the WiFi adapter has been 10 designed using a 3D printer, and the adapter card and driver are acquired commercially. As a result, the produced WiFi 11 adapter has been realized in a size of approximately 60% smaller than the other modules using commercially available 12 monopole antennas on the market. The WiFi adapter provides IEEE 802.11.n/g/b standards and supports USB 2.0. It 13 has been observed that the speed measurement tests have been performed successfully and that the download-link and 14 upload-link can reach 600 Mbps data rate rates. In addition, BPSK, QPSK, 16QAM with OFDM modulation techniques 15 are used. 16 Key words: Planar Metal Antenna, Metal Plate Antenna, Slotted Antenna, Dual Band, Triple Band, USB-WiFi 17 adapter, WLAN Application 18 1. Introduction 19 Due to the demand growth for wireless communication, LTE, WiMax and WLAN applications with MIMO 20 technology are in need of faster data transfer, more channel capacity and consequently multiple and wider 21 frequency bands. Therefore, to provide worldwide compatibility in diﬀerent devices, 2.4 / 5.2 / 5.8 GHz WLAN 22 and 3.5 / 5.5 GHz WiMAX frequency bands are primarily preferred. This requires that the designed antennas 23 evolve into broadband or multi-band conﬁguration. Today, in addition to the multiple and wider band properties, 24 cost-eﬀective compact antennas are in demand with versatile integrability, high eﬃciency, and high gain [1–3]. 25 For many WLAN application, diﬀerent types of antennas can be used such as microstrip or metal plate. 26 Each antenna type has its own strengths and weaknesses based on the application. In literature lots of microstrip 27 antenna design can be found [4, 5]. The microstrip antenna structures are used widely because of their simple 28 material and structural properties along with the practical design procedure. Also, for these antennas, the 29 * Correspondence: cem baytore@hotmail.com 1