Photonic Crystal Flat Panel Radiators for Wideband High Power Antennas
Abstract
The two areas that we focused on in this period were (1) the integration of a microstrip patch antenna with a two-dimensional photonic crystal substrate, and (2) the time and frequency domain detection of superluminal group velocity in one-dimensional photonic crystals. For the two-dimensional photonic crystal substrate work, we studied the effects of a finite sized ground plane on the resonance frequency of a microstrip patch antenna. A finite difference time domain (FDTD) code was used for these studies, and the calculations were found to be in good agreement with the experimental characterizations. The effect of a defect state under the antenna location was also studied and found to improve the performance. For the one-dimensional photonic crystal characterization studies, a transfer matrix technique was used to obtain analytical closed form expressions for both the transmission and reflection coefficients of a plane wave incident onto it. We were able to experimentally measure superluminal group velocities for propagation through the stop bard of a one dimensional photonic crystal. This result is not inconsistent with special relativity or causality since the frontal (forerunner) velocity of the signal never exceeds the speed of light in vacuum. These results are important for a fundamental understanding of electromagnetic wave propagation through short interaction regions with anomalous dispersion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 25, 1999
- Accession Number
- ADA365226
Entities
People
- Edl Schamiloglu
- Kamil Agi
- Kevin J. Malloy
- Mohammed Mojahedi
Organizations
- University of New Mexico