Author : Wenbo Liu
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)
Book Synopsis A Single-Print Additively-Manufactured Wideband Beamforming Network and Antenna Array by : Wenbo Liu
Download or read book A Single-Print Additively-Manufactured Wideband Beamforming Network and Antenna Array written by Wenbo Liu and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation seeks to demonstrate novel high-frequency electromagnetic (EM) beamforming networks enabled by using additive manufacturing (AM) and electroless metallization techniques. Specifically, the proposed goal of this work is to utilize the "design for additive manufacturing" (DfAM) philosophy to facilitate the morphological/topological development and miniaturization of a wideband beamforming network using these new fabrication techniques to achieve designs that would not be otherwise realizable using traditional fabrication techniques like machining and the use of printed circuit boards (PCBs). The demonstration vehicle for this dissertation begins with a millimeter-wave (mm-wave) filter to explain the advantage of curvilinear architecture with additive manufacturing. The additively manufactured couplers and crossovers based on the circular waveguide follow this. A compact Butler Matrix formed from circular and curvilinear waveguides, cavities, and tuning elements for mm-wave application is then provided. This work includes the analysis, design, fabrication, and experiment of couplers, crossovers, and phase shifters for a four-input, four-output (4x4) Butler Matrix. This Butler Matrix will serve as a beamforming network to steer a co-designed wideband antenna array. The scope of this includes mode transducers and custom thru-reflect-line (TRL) calibration components required for experiments. The first design adopts additive manufacturing techniques to implement a V-band (59-63 GHz) bandpass filter based on spherical resonators with elliptical waveguide feeds. Experiments were conducted on curvilinear architecture, which can mitigate corner radius effects in both electromagnetic performance and additive manufacturing processes compared with the traditional rectangular form. The second design exploits additive manufacturing capabilities based on a 3-dB hybrid directional coupler. The proposed structure with perturbations is engineered to operate in the ISM band from 57 to 64 GHz. The design can provide both 10 dB isolation and return loss and a 90° phase difference between the direct and coupled ports. The experience then extends to additively manufactured wideband and compact couplers and crossover with DfAM to enable mass production for constructing a large-scale beamforming network. The proposed structure can operate between 52 GHz and 65 GHz with a 22.2% fractional bandwidth (FBW). The topologies have good scalability, which can be easily shifted to different frequency bands. This operation range is wider than the FBW requirement for the WiGig band (21.9%). The frequency difference is due to the limitation in the resolution of the stereolithography (SLA) printer and the operation frequency range of the lab equipment. The final design follows the DfAM for electromagnetic by demonstrating the ability to develop compact and beamforming networks and a 4-element antenna array. A systematic approach is presented by engineering both planar and non-planar 4x4 Butler matrices for V-band operation. The resulting Butler matrix is then integrated with a 4-element array of horn antennas, which can eliminate the need for post-fabrication assembly. Results from the experiments and the full-wave simulations are provided for all designs.
