© 2019, IJCERT All Rights Reserved https://doi.org/10.22362/ijcert/2019/v6/i03/v6i0302 293 International Journal of Computer Engineering in Research Trends Multidisciplinary, Open Access, Peer-Reviewed and fully refereed Research Paper Volume-6, Issue-3, 2019 Regular Edition ISSN: 2349-7084 Quad-Band Circularly Polarized Patch Antenna for UWB/5G Applications A.Sivabalan 1 , G.Bharathi 2 , K.Deepeka Rani 3 ECE, Chennai Institute of Technology, Anna University, Chennai, India e-mail: asbalan87@gmail.com, bharathinive1997@gmail.com, deepekarani.krishna@gmail.com Corresponding Author: asbalan87@gmail.com Available online at: http://www.ijcert.org Received: 23/03./2019, Revised: 27/03/2019, Accepted: 03/04/2019, Published: 11/03/2019 Abstract: A quad-band circularly polarised (CP) patch antenna for 7.1/7.6/7.9/8.6 GHz for UWB/5G applications are proposed in this paper. By designing the patch antenna with an inverted U-shaped radiator, I-shaped and L-shaped strips which are all rotated by 45ᵒ at the horizontal axis. The measurement of -37.51 dB of return loss for 8.6 GHz frequency was obtained. A microstrip line feed technique was used for feeding which is one of the contacting schemes used in the feeding methods. A conducting strip is connected directly to the edge of the microstrip patch. It provides a simple planar structure since the conducting strip is smaller in size when compared to the patch. The substrate FR_4 epoxy has high electrical insulation, good mechanical strength, better wear, and corrosion resistance. The measured 3 dB AR information is 5.63% (6.9-7.3 GHz), 5.26% (7.4-7.8 GHz), 5.0% (7.8-8.2 GHz) and 3.50% (8.4-8.7 GHz) severally. This antenna can be used in UWB/5G applications which offer high-speed data transmission. Keywords- Microstrip Antenna, Circularly Polarized (CP) Antenna, Inverted Strips, Microstrip Line Feeding, Multi-Band Antenna, UWB (Ultra Wide Band). 1. Introduction An antenna acts as an intermediate between radio waves propagating through free space and electric currents moving in metal conductors, used with the transmitter or receiver. The antennas are of two types, one is an omnidirectional antenna, and the other one is a high gain directional antenna. Once the radio waves are transmitted, they propagate as electromagnetic waves in the free space. After the electromagnetic waves arrived at the receiving antenna, a voltage is induced into the antenna. The radio frequency voltage which was received at the receiver side was given to the antenna for the amplification process [1]. In the late 1970s, microstrip antenna technology development began rapidly. In the early 1980's design and modelling microstrip antenna elements are well established, and workers turned their attention to improving antenna performance features like