Experimental comparison between far- and near-infrared wavelengths in free-space optical systems
✍ Scribed by C. P. Colvero; M. C. R. Cordeiro; G. V. de Faria; J. P. von der Weid
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 287 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0895-2477
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✦ Synopsis
A coplanar-waveguide (CPW) version of the antenna has been studied with similar results. The fork-shaped stub is placed on the same side of the slot. In this case, the feeding CPW width and gap are W ϭ 1.2 mm and g ϭ 0.12 mm, respectively; the slot/forkstub offset is ␦Ј ϭ 0.7 mm. This latter version of the antenna has one metal layer only and, therefore, there are no misalignment errors between different metals in the fabrication process.
CONCLUSION
A planar rectangular-slot antenna, fed by a microstrip with fork-shaped stub, has been presented for application in UWB communications. For this structure, due to the substrate's stable high-frequency behavior, a systematic study and an optimization process have been possible. The experimental results show an impedance bandwidth from 3.10 to 11.70 GHz (about 116.2%) for a VSWR Ͻ 2, amply fulfilling the UWB requirements. The proposed antenna is very compact and exhibits stable gain patterns with good time-domain response, both of which are important characteristics for wideband UWB communications.