Quarter-wave phase-compensating multidielectric lens design using genetic algorithms
✍ Scribed by Lei Sun; Evor L. Hines; Christos Mias; Roger Green; Daciana Udrea
- Book ID
- 102516297
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 258 KB
- Volume
- 44
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
1.85-5.70 GHz, which is approximately 115.5%, for the VSWR Յ 2.0. The measured bandwidth (115.5%) is wider than the simulation one (112.6%). The proposed antenna showed triresonance characteristics due to the wide bandwidth.
Figure 8 presents the experimental pattern in the E-plane at f ϭ 3.33 GHz. After completing the calibration using a horn antenna, we measured the radiation pattern of the far field. The beamwidth was measured at approximately 70°. Figure 9 presents the experimental pattern in the H-plane at the same frequency. Figure 10 shows a comparison of the calculated and measured gain for the proposed antenna. The experimental results are in relatively good agreement with the calculated results. The antenna gain was approximately 3 dBi over the usable entire band.
4. CONCLUSION
We have presented the characteristics of a cross-shaped microstripline-fed printed slot antenna. The proposed antenna with relative permittivity 2.2 and thickness 1.575 mm is analyzed using the FDTD method. The dependence of the design parameters W s , l u , and offset upon the bandwidth characteristics has been investigated. The calculated bandwidth (112.6%) of RT-5880 is wider than the simulated one (90.6%) of the FR-4 substrate. We also compared the optimized offset/W s ratio and the calculated bandwidth of RT-5880 substrate for slot width W s . When W s is 32 mm, the optimized offset/W s ratio is 0.344, and the calculated band width is 3.744 MHz (112.6%). The experimental bandwidth of this antenna is from 1.85 to 5.70 GHz, which is approximately 115.5%, for VSWR Յ 2.0. The proposed antenna showed triresonance characteristics due to the wide bandwidth. This antenna may be useful as a powerful broadband-array antenna.