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In this paper, a new design of pencil-beam planar dipole array antenna (PDAA) with reflector back has been designed and fabricated for IEEE 802.11ac outdoor applications. The proposed antenna is a planar array combined with a reflector. | VNU Journal of Science: Comp. Science & Com. Eng., Vol. 32, No. 3 (2016) 26–31 A Pencil-Beam Planar Dipole Array Antenna for IEEE 802.11ac Outdoor Access Point Routers Tang The Toan1 , Nguyen Manh Hung1 Nguyen Minh Tran1 , Truong Vu Bang Giang2,∗ 1 2 University of Hai Duong VNU University of Engineering and Technology, 144 Xuan Thuy, Cau Giay, Hanoi, Vietnam Abstract In this paper, a new design of pencil-beam planar dipole array antenna (PDAA) with reflector back has been designed and fabricated for IEEE 802.11ac outdoor applications. The proposed antenna is a planar array combined with a reflector. The planar array is comprised of 4 × 4 × 3 single elements which are placed on an FR4-epoxy substrate with the size of 241 mm × 194 mm × 1.6 mm. This design has very good simulation results in terms of the radiation pattern, gain and input impedance bandwidth. A very high gain of 18.2 dBi has been achieved at 5.5 GHz, and the bandwidth is relatively wide with about 23% of the center frequency, which covers the whole bandwidth allocated for the application. A prototype has been fabricated and measured. The measurement results have very good agreements with the simulated data. Received 22 March 2016, Revised 24 June 2016, Accepted 26 September 2016 Keywords: Pencil-Beam, High gain, IEEE 802.11ac, Microstrip antenna. 1. Introduction band compared with the existing 802.11 standards working at both 2.4 GHz band and 5 GHz band, and allows to support very wide bandwidth up to 160 MHz. However, the propagation loss in this band is about 8 dB higher than that at 2.4 GHz. Therefore, for outdoor applications especially, antennas required to gain more than 10 dBi [3]. Nowadays, Internet users are demanding for more streaming videos, database searches, file transfers, and cloud-based storage applications on a daily basis. This places increasing requirements on a future network ability to provide consistent bandwidth, data rate [1, 2]. The IEEE 802.11ac, the fifth generation .
