An improved ray-tracing propagation model for predicting path loss on single floors
✍ Scribed by Zhong Ji; Bin-Hong Li; Hao-Xing Wang; Hsing-Yi Chen; Yaw-Gen Zhau
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 139 KB
- Volume
- 22
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
CONCLUSION
The results for the two test cases indicate that the potential advantages of the utilization of wideband slot radiators are limited, while employing subarraying in the design of planar arrays is the most effective way of improving the bandwidth. This suggests that the main cause of performance degradation is the phase deviations in the elements excitations due to shifts in the standing-wave patterns. Only a small sample was considered, but additional numerical experiments on arrays of various sizes led to the conclusion that the advantages of wideband radiators are largely limited to increased input impedance bandwidth for arrays with a small number of slots in each branch. In all cases, the effects on the pattern performance of arrays were minimal. The most effective way of improving the bandwidth of linear arrays is to use centerfed branches, which may be viewed as a form of subarraying. While the implementation of subarrays in planar slot arrays inevitably results in an increased complexity of the beamforming networks, results indicate that it remains the only option when improved bandwidth is required, especially in the case of larger arrays.