Analysis and design of printed leaky-wave antennas for broadside radiation
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2009
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Abstract
This thesis describes the analysis and design of two printed leaky-wave antennas (LWA) for broadside radiation. The first design consists of a microstrip transmission line with periodic radiating open stubs. While this type of antenna is not new, a diffrent design approach using t he leaky-wave concept is demonstrated. The advantage of t his approach is additional insight in the antenna radiation behavior through the leaky wavenumber information. A variation of this design, which is facilitated by the leaky-wave concept, is the introduction of reflective terminations in the LWA to attain partial control of t he antenna aperture illumination. Analyses and measurement examples for 50 D, open, and short terminations are described. In the enhances the broadside radiation of the printed antenna while keeping radiation at the horizon low. Alternatively, one may interpret this radiation mechanism through the periodic leaky-wave concept which again provides valuable insight. The details of the analysis, design, and measurement results are described in the thesis. process of the design and measurements of this design, some previously unknown aspects in the broadside LWA involving the beam-splitting condition for finite antenna lengths and measurement distance errors were discovered. These are explained and quantified in detail in the thesis. The second design involves a method to control the usually undesirable surface wave (SW) t hat is excited in the grounded dielectric substrate (GS) by printed antennas, such as printed microstrip patches, printed dipoles, and open stubs as described in the first design. This design makes use of a series of periodic metallic rings of scat terers arranged concentrically around the printed antenna. Though similar in idea to the holographic antenna, this design is an adaptation of t he surface wave based holographic antenna where the SW parameters are more applicable to printed antennas. This is achived by introducing dual phase-shifting metallic dipoles per periodic distance. Using this technique, the SW is re-radiated in such a way that enhances the broadside radiation of the printed antenna while keeping radiation at the horizon low. Alternatively, one may interpret this radiation mechanism through the periodic leaky-wave concept which again provides valuable insight. The details of the analysis, design, and measurement results are described in the thesis.
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Bibliography: p. 164-177
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Citation
Sutinjo, A. T. (2009). Analysis and design of printed leaky-wave antennas for broadside radiation (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/3164