Title:
Leaky-Wave Antennas Based on Microstrip and Waveguide Structures
Date:
Wednesday, February 2, 2011 from 11:00 am
Location:
E2-361 EITC
University of Manitoba Fort Garry Campus
Speaker:
Dr. Adrian Sutinjo
University of Calgary
Abstract:
This presentation is based on the research performed during my PhD studies and post-doctoral work at the University of Calgary. Leaky-wave antenna designs based on surface wave (SW) and a rectangular waveguide are presented. The first design concerns controlling the SW excited by a microstrip patch antenna, while the second design involves suppression of spurious radiation from a slitted waveguide leaky wave antenna.
In the first part of the talk, a holographic antenna inspired structure is used to control the surface wave (SW) excited by a microstrip antenna. Unlike the electromagnetic bandgap (EBG), the holographic structure is intended to provide radiative attenuation. In this design, the holographic approach is
adapted for microstrip antenna applications. This is achieved by introducing dual phase-shifting metallic dipoles with periodic spacing. Using this technique, the SW is captured and re-radiated in a way that enhances the
broadside radiation of the printed antenna while keeping radiation at the horizon low. I will describe a systematic procedure to design structures of that type and will show validations of two designs based on full-wave simulations and prototype measurements.
In the second part of the talk we will revisit a long standing problem of controlling modes excited in a slitted waveguide. I will show that transverse perturbations in the form of periodic slots in the narrow-wall can be employed to suppress the spurious slot-mode radiation in a slitted waveguide thus
allowing for pure leaky mode radiation. The presence of the perturbations transforms the fast wave supported in an unperturbed slot to a slow wave. Slitted waveguides with and without perturbations are compared in full-wave
simulations and in measurements. I will show that significant and consistent reduction of the slot-mode radiation is achieved with the perturbations.
Cost:
This will be a free event.
Contact:
For questions or more information: Shelly Girardin.
