Universiti Teknologi Malaysia Institutional Repository

Two dimensional switched beam antenna at 28 GHz for fifth generation wireless system

Orakwue, Stella Ifeoma (2016) Two dimensional switched beam antenna at 28 GHz for fifth generation wireless system. PhD thesis, Universiti Teknologi Malaysia, Faculty of Electrical Engineering.

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Abstract

Fifth generation (5G) wireless system is expected to enable new device-to-device (D2D) and machine-to-machine (M2M) applications that will impact both consumers and industry. Moreover, for efficient M2M communication, both one dimensional (1-D) and two dimensional (2-D) beam switching is highly needed for high data-rate wireless radio links. A planar array with 2-D beam switching capabilities is highly desirable in 5G system. This thesis proposes a new technique of achieving simple and cost effective 2-D beam switching array antenna at 28 GHz for 5G wireless system. The technique involves lateral cascading of Butler matrix (BM) beamforming network (BFN). However, designing a planar BM at 28 GHz that will allow K-connector is not a trivial issue because the distances between the ports are X/4 electrical length apart. Nevertheless, two branch line coupler (BLC) with unequal ports separation at 28 GHz on a single substrate are designed and applied to design 1-D switched beam antennas based on BLC and 4 * 4 BM. Then two of these antennas are laterally cascaded to achieve 2-D beam switching antenna. This novel concept is the basis for choosing BM BFN in the design. The proposed 1-D array antennas on BLC and BM have wide measured impedance bandwidth of 18.9% (5.3 GHz) and 21.7% (6.1 GHz) and highest gain of 14.6 dBi and 15.9 dBi, respectively. The 2-D switched beam antenna on cascaded BLC has highest realized gain of 14.9 dB, radiation efficiency of 86%, 86.8%, 85.5%, and 83.4% at ports 1 to 4, respectively. The switching range of from -25o to +18° in the x-z plane and from -18o to 24o in the y-z plane, while the 2-D switched beam antenna based on cascaded 4 * 4 BM has switching range of -41o to 43o in the x-z plane and -43o to 42o in the y-z plane with highest realized gain of 14.4 dBi. The proposed antennas have great potentials for 5G wireless communication system applications.

Item Type:Thesis (PhD)
Additional Information:Thesis (Ph.D (Kejuruteraan Elektrik)) - Universiti Teknologi Malaysia, 2016; Supervisors : Assoc. Prof. Dr. Razali Ngah, Prof. Dr. Tharek Abd. Rahman
Uncontrolled Keywords:device-to-device (D2D), one dimensional (1-D)
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:60723
Deposited By: Fazli Masari
Deposited On:28 Feb 2017 00:37
Last Modified:08 Oct 2017 07:33

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