Wideband miniature antenna for IEEE 802.11a and 11b WLAN standards

✍ Scribed by M. Multari; R. Staraj

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 110 KB
• Volume: 48
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.21416

✦ Synopsis

resolution is lower (ϳ1.26), and it occurs only at z ϭ 4 0 . There is no resolution at z ϭ 2.95 0 , showing that the focal region is narrower. Using a thin slab (d ϭ 0.04 m) instead of the previous thick one (d ϭ 0.08 m), it can be shown that when the probe is missing, the intensity is higher (about eightfold), the resolution is lower (ϳ1.3 against ϳ1.9), and the focal region is narrower. If we remove the metamaterial thick slab, leaving air between the object and the probe, we observe that the image is around 200 times weaker, showing the decisive influence of the metamaterial slab in obtaining high-intensity images.

CONCLUSION

A metamaterial scanning near-field optical microscope has been proposed. The object (consisting of a pair of long subwavelength slits) is separated from the probe (consisting of a long subwavelength slit) by a metamaterial slab. The probe slides along the slab. It has been found that by using two slabs of different widths (with and without probe) in the cases considered, the resolution is better when the probe is present. It is advantageous to use a probe when we wish to scan only part of an object. Moreover, since a number of different probes is available, we can select the probe best suited to our needs. A study is underway to optimize the various parameters and the components involved in the microscope in order to obtain the strongest intensity with the highest resolution.