Study of the band-notch function for a UWB circular disc monopole antenna

✍ Scribed by Xinan Qu; Shun-Shi Zhong; Wei Wang

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 315 KB
• Volume: 48
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.21710

✦ Synopsis

at different angles. Figure 5(a) shows the AR value of 2.434 GHz with L t ϭ 12 mm against the elevation angle () with different azimuthal angles of ϭ 0°and 90°. It can be noted that the range of elevation angles from Ϫ55°to 62°has a smaller 3-dB AR value at ϭ 0°. Correspondingly, in Figure 5(b), as the is at the angle of 90°, the elevation angle range of AR value less than 3 dB is from Ϫ23°to 80°. Compared to antenna with L t ϭ 12 mm, the L t ϭ 11.5 mm seems to have a narrower angle range of Ϫ21°to 26°at ϭ 90°. Thus, the antenna with L t ϭ 11.5 mm has better measured return loss (not shown here) and CP bandwidth; even so, we chose 12 mm as the length of L t to fabricate a broadside CP CPW-fed inductive slot antenna.

4. CONCLUSION

A novel design of CPW-fed inductive square slot antenna has been investigated and successfully implemented. The impedance return loss of Ϫ42 dB is measured at the resonant frequency of 2.48 GHz. The 3-dB AR bandwidth is 260 MHz or 10.6% and maximum gain is about 3.5 dBi at 2.45 GHz. The simulation and measurement results match reasonably well. This antenna has excellent performances and is very suitable for wireless communication applications.