A 5.2-GHz cascade-mos 0.35-μm BiCMOS technology ultra-low-power LNA using a novel floating-body method
✍ Scribed by Hsien-Ku Chen; Hsien-Jui Chen
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 237 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
to increase the illumination towards the edges of the aperture. This would account for the difference between the measured radiation pattern and the calculated optimal value, also shown in Figure 4.
5. Discussion
The measured radiation pattern shows that the incorporation of the lens has a dramatic effect on the radiation performance of the wedge.
It is important to note that the true centre frequency of the lens was measured to be 9.6 GHz instead of the 9.5 GHz, as in the design. This can be accounted for by the fact that a number of approximations had to be made to arrive at values for the propagation constant. Because of the frequency sensitivity of the lens, the operating frequency would be affected by any error. Secondly, the value of the effective dielectric constant determined by measurement is valid for the LSM mode in an NRD waveguide, and this may differ slightly for the cylindrical mode in a die wedge.
6. CONCLUSION
The compensation of the phase error of a dielectric wedge in a nonradiative mode has been shown to be effective. It can be used to compensate for short lenses with large flare angles. The type of antenna is useful as a feed for cylindrical paraboloids, or for other applications where a fan beam is needed.
ACKNOWLEDGMENT
The author wishes to express appreciation to Jan Brand for the manufacture of the prototype, Lukas Naude ´for performing the measurements, and Johan Joubert for valuable discussions.