Design of pattern reconfigurable antenna employing RF-MEMS switches

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2022-8-17
Gök, Çağlar
In this thesis, the design, simulations, fabrication and measurements of reconfigurable antennas for use in 5G Massive MIMO systems are presented. 26 GHz is chosen as the operating frequency and RF-MEMS switches are used as control elements for pattern reconfiguration. As a first step, a patch antenna is designed based on the excitation of different operation modes of different resonators. A circular patch in the center and a ring resonator structure around it are used to create different radiation patterns by utilizing different modes of each resonator. The antenna is designed to have two feeds; the feed points are located at two opposite sides of the antenna. Two different radiation patterns, namely broadside and conical beams, are obtained depending on whether the antenna ports are fed in phase or out of phase. To increase the number of different radiation modes and to obtain radiation patterns that are not symmetric, two slots are opened in the ground plane of the antenna. Through the RF-MEMS switches placed inside these slots, one of the slots are short circuited and asymmetric radiation patterns are obtained for both in-phase and out of phase feeding. Due to the prolongation of the manufacturing process in METU MEMS Center, in order to validate the reconfiguration concept proposed in this thesis, the design is repeated by using a commercially available dielectric substrate and by choosing a lower frequency band (the sub-6 GHz band) so that the antenna can be manufactured by using LPKF PCB Prototyping machine. To provide in-phase and out of phase excitation of antenna ports, a rat-race coupler is also designed. The antenna is manufactured together with the rat-race coupler and measured.

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Citation Formats
Ç. Gök, “Design of pattern reconfigurable antenna employing RF-MEMS switches,” M.S. - Master of Science, Middle East Technical University, 2022.