- 274 views
- 321 downloads
Design of Traveling Wave SIW Antennas for 5G Base Stations
-
- Author / Creator
- Mohamadi Monavar, Fatemeh
-
This thesis describes new configurations of traveling wave antenna arrays. The ability of traveling wave antennas to integrate radiating element with transmission line in one single device which can be easily fed, are among reasons for popularity of such structures. Leaky-wave antennas (LWA) can achieve highly directive beams that can be scanned with frequency which is very advantageous for wide angle scanning applications. Some applications however prefer a fixed broadside beam over a tilted off-broadside leaky-wave beam. In this case slot arrays are a more suitable choice. Both leaky-wave and slot arrays are studied in this thesis with regards to application in 5G base station antennas (BSA).A new double layer subarray configuration for leaky-wave antenna at 15 GHz is presented. The structure is capable of frequency scanning a highly directive beam in the elevation and switching a flat-topped beam to illuminate specific regions of space in the azimuth. A cylindrical arrangement of such antennas is shown to be highly efficient for multi-beam antenna solutions. Beam-shaping in the array is done by virtually moving phase centers through appropriate port-excitations without physically changing antenna structures or need for phase shifters. Far-field patterns, scattering parameters and isolation between two leaky-wave antennas in the subarray are examined and show good agreement with the measurement results.Our design of narrow-wall waveguide slotted array at 26 GHz serves to provide some additional features for BSA such as circular polarization (CP) and broadside radiation. More importantly CP is accomplished through reflection-cancelling slot pair unit cells on the narrow wall which compared to its broad wall counterparts more frequently discussed in literature, can considerably reduce the size of future planar arrays. Owing to the novel multilayer PCB topology employed, our design can easily be changed to operate at a new frequency with a different feeding system and unlike bulky waveguides is capable of full integration with planar circuitry. Near field, far-field, and scattering properties are evaluated in detail which show radiation performance according to desired Taylor aperture distribution is obtainable.
-
- Subjects / Keywords
-
- Graduation date
- Spring 2019
-
- Type of Item
- Thesis
-
- Degree
- Doctor of Philosophy
-
- License
- Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.