Designing and Analyzing a Planer Butler Matrix for Phased Array Antenna for Future 5G Applications

Abstract

Future 5G (Fifth Generation) wireless communication claims for many fold increase in data rates, quality of service and connectivity. This gaga bits per second data rate is made possible by steerable antennas and mm-wave spectrum. This paper presents a design consists of 4-elements linear phased array feed by 4x4 Butler matrix for future 5G wireless communication networks. However, the Building block of Butler matrix are hybrid couple, crossover, and phase shifter. Both the Butler matrix and micro strip antenna array are designed on a single layer Roger RT5880 substrate having dielectric constant is 2.2 (Îr=2.2) and thickness 0.254mm. The dimensions of Butler matrix, its components and micro strip antenna are designed and optimized in CST (Computer Simulated Technology) microwave studio. The area of Butler matrix is 30x17mm² and the overall area is. The reflection from each input port and its coupling with other input ports are investigated and they are below -10dB in the whole band. The S₁₁ parameters of array shows a wide BW (Band Width) having frequency band from 26.3-29.55GHz. The insertion loss on average equal to 6.9dB. The radiation pattern for different input port excitation shows that beams are pointing at +10, -38, +38 and -10^o, from broad-side and their corresponding gains are 12, 10.4, 10.4 and 12dB respectively. The side lobe level are -11.5, -6.2, -6.3 and -11.6 while half power beam width are 29.2^o, 30.4^o, 30.2^o and 29.3^o respectively. Apart from this array pattern synthesis and analysis are discussed which conform simulated results.