Steerable Extreme High Gain Antenna System for 5 and 6G Wireless Transport

Examensarbete för masterexamen
Master's Thesis
Övrigt, MSc
Chaudhry, Sohaib Yaqoob
Abstract The rapid advancement of 5G and 6G technologies has ushered in a new era of wireless communication, demanding higher performance capabilities. To meet these demands, Radio Access Networks (RANs) are increasingly utilizing higher frequencies to enhance channel capacity. Wireless backhaul networks are also exploring the potential of operating at even higher frequencies, such as the W-band (92GHz114GHz), to enable high-capacity networks. Recent trials have demonstrated that W-band performs on par with E-band and offers a wider untapped spectrum for high-capacity wireless transport. However, the deployment of high-gain antennas necessary for long-distance, high-capacity, and robust W-band links poses challenges in terms of tower stability requirements. To address these challenges, the Vinnova funded Project at the Chalmers University of Technology is focused on a novel solution—an electronically steerable antenna system with high-gain capabilities operating in a Frequency Division Duplex (FDD) configuration for backhaul links. The research objective is to enable FDD configuration in electronically steerable antennas through the design and integration of a compact W-band Diplexer Assembly. The primary objective of this master’s thesis is to design and optimize a compact W-band diplexer utilizing the K-Impedance Inverter and Coupling Matrix Method. The design comprises ten iris-coupled resonator cavities assembled with a power divider in a T-junction topology. The resulting diplexer exhibits a 5th order Chebyshev type frequency response centered at 95.5GHz and 107.5GHz, respectively, with each diplexer channel providing an effective bandwidth of 3GHz. The diplexer achieves a maximum passband return loss of -15dB and an insertion loss of less than 1 dB. The design underwent multiple optimization strategies to reduce overall vol ume while maintaining high manufacturing tolerances of ±15um. These strategies included symmetrical and asymmetrical inductive and capacitive iris-based filters, dual-mode and higher-order-mode cavity resonators (TE10n), H-plane T-junction, and the evanescent mode filters. The use of higher-order (TE102) mode filters proved to be the optimal strategy, resulting in a compact diplexer assembly manufactured using precision CNC milling. The performance of the diplexer assembly was validated through laboratory measurements. A comprehensive competitive analysis was conducted, comparing the implemented design technique with available designs in the literature to evaluate advantages and drawbacks. Finally, the diplexer assembly was seamlessly integrated with the available Focal Plane Array, and a 3D Electromagnetic (EM) Model was generated to complete the research objectives.
W-Band, Steerable Antennas, Waveguide, Filters, Higher-order modes, Diplexer, FDD, 5G and 6G, Wireless Transport , W-Band , Steerable antennas , Waveguide , Filters , High-order modes , Diplexer , FDD , 5G , 6G , Wireless transport
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