Shady, Mostafa O. (2023) Packaged Printed Multilayer Beamforming Microwave Components. Masters thesis, Concordia University.
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Abstract
Low-loss, compact, and high-frequency microwave devices are in high demand to fulfill the currently required communication systems specifications. Thus, the present work is devoted to the design and compactness enhancement of microwave components. Multilayer technology for printed circuits is utilized for maximum size reduction with artificial magnetic conductor (AMC) packaging to create a self-packaged/shielded system.
An electromagnetic band-gap (EBG) cell is presented to miniaturize the size by replacing the mushroom patch with a spiral unit that lowers the stopband center frequency by half compared to the patch in the same cell size. The principle of operation and parametric studies are discussed. Also, methods to enhance the stop bandwidth are discussed.
Microstrip line (MSL) multilayer power dividers with equal power division to ports in two different layers but different phase outputs are designed. A via less power transfer between the layers is realized by an elliptic slot on the common thick ground plane, which transfers the power throughout the layers capacitively. Various slot and matching transformer shapes control the phase difference between the output ports and the input matching bandwidth. AMC packaging is used to suppress radiation losses and leakage. The realized power dividers achieve a phase difference from 0° to 180° ±6° with a matching input level below -15 dB within 21.8% bandwidth at center frequency 29.75 GHz.
Finally, a novel 4 × 4 multilayer Butler matrix (BM) is proposed, reducing the conventional size by more than twofold. The design eliminates crossover couplers, considerably enhancing compactness and isolation, and uses air MSL packaged by an AMC to suppress wave leakage and radiation loss. The design and performance of the building block components are provided. The BM operates from 27 to 31 GHz with a 0.6 ± 1.4 dB insertion loss and a phase imbalance of ± 8°. It achieves isolation better than 14 dB with a good matching level. The presented 4 × 4 BM concept can be extended to N × N BMs. A four-slot linear antenna array is connected to the BM. The measured and simulated radiation characteristics are compared and found to be in good agreement.
| Divisions: | Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering |
|---|---|
| Item Type: | Thesis (Masters) |
| Authors: | Shady, Mostafa O. |
| Institution: | Concordia University |
| Degree Name: | M.A. Sc. |
| Program: | Electrical and Computer Engineering |
| Date: | 30 July 2023 |
| Thesis Supervisor(s): | Kishk, Ahmed |
| ID Code: | 992614 |
| Deposited By: | Mostafa Osama Mohamed Ibrahim Shady |
| Deposited On: | 15 Nov 2023 15:27 |
| Last Modified: | 15 Nov 2023 15:27 |
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