Some considerations on the correct measurement of the gain and bandwidth of electrically small antennas

✍ Scribed by O. Staub; J.-F. Zürcher; A. Skrivervik

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 214 KB
• Volume: 17
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/(sici)1098-2760(19980220)17:3<156::aid-mop2>3.0.co;2-i

✦ Synopsis

thinner layers. Obviously, the ability to reduce the separation of the 2-D planes of scattering elements to, and below, the ideal hcp distance has enabled us to improve the stopband characteristics, and could, in the future, be an essential tool in designing optimum MDPC structures.

Conclusions

In summary, we have fabricated microwave photonic crystal structures that incorporate flat metal scattering elements and dielectric spacer layers to form a 3-D fcc bravais lattice. Measured transmission spectra reveal a primary photonic stopband centered at 8.4 GHz with a 50% spectral width and 18 dB rejection per period of the fcc crystal. This photonic stopband exists for a wide range of incident angles. Comparison with a crystal that utilizes spherical metal scattering elements reveals close agreement in the location of the primary stopbands, and helps to explain some of the secondary features found in the flat-atom spectra. Flat-atom MDPCs with several different dielectric layer thicknesses have been explored.