Dipole antennas used with all-dielectric, woodpile photonic-bandgap reflectors: Gain, field patterns, and input impedance
✍ Scribed by Glenn S. Smith; Morris P. Kesler; James G. Maloney
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 196 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
A slab of ''woodpile'' photonic-bandgap PBG material is examined as a planar, all-dielectric reflector for a dipolermonopole antenna. Gain, field patterns, and input impedance are obtained using full electromagnetic calculations based on the finite-difference time-( ) domain FDTD method and measurements. Of particular interest is the dependence of these parameters on the distance of the monopole in front of the PBG slab and the location of the monopole relati¨e to the structure of the unit cell of the PBG material. The pre¨iously introduced ''reflection plane concept'' for the PBG material is shown to be a useful design tool for this type of antenna. Additional measured results demonstrate that radiation from an antenna is indeed reduced to a low le¨el when it is placed within a finite ¨olume of PBG material and excited at a frequency within the bandgap of the material.