This paper presents the design of a wideband circularly polarized E-shaped patch antenna for wireless local area networks (WLAN) applications. The proposed antenna is a modified form of the conventional circularly polarized E-shaped patch antenna. | VNU Journal of Science: Comp. Science & Com. Eng., Vol. 31, No. 2 (2015) 1-7 Design of A Circularly Polarized E-shaped Patch Antenna with Enhanced Bandwidth for GHz WLAN Applications Hong Van Tam1, Luong Vinh Quoc Danh*,2 1 Vinaphone Company, Vietnam Department of Electronics and Telecommunication Engineering, College of Engineering Technology, Can Tho University, Vietnam 2 Abstract This paper presents the design of a wideband circularly polarized E-shaped patch antenna for wireless local area networks (WLAN) applications. The proposed antenna is a modified form of the conventional circularly polarized E-shaped patch antenna. By incorporating additional slots into the antenna patch, the impedance bandwidth and return loss of the circularly polarized antenna are improved by about and 12 dB, respectively. Measurements of the fabricated antennas show good agreement with simulated results. © 2015 Published by VNU Journal of Science. Manuscript communication: received 30 April 2014, revised 04 May 2015, accepted 25 June 2015 Corresponding author: Luong Vinh Quoc Danh, lvqdanh@ Keywords: Axial Ratio, Circular Polarization, E-shaped Patch, WLAN. 1. Introduction Circularly-polarized antennas have been employed in many modern wireless communication systems such as navigation, satellite communication systems, radio frequency identification (RFID), WLAN and WiMAX. One of the attractive advantages of the circularly polarized antennas is that they can reduce transmission loss caused by the misalignment between antennas of transmitter and receiver. In addition, circular polarization provides better ability to combat multi-path fading problem and thus enhances overall system performance. In [1], the authors have presented a circularly polarized E-shaped patch antenna with unequal slots that offers wideband axial ratio bandwidth compared to the U-slot patch antennas. The design introduced in [1] has provided a simple approach to achieve circularly .
