Combination of electric and magnetic dipoles with single-element feeding for broadband applications

✍ Scribed by Karlo Q. da Costa; Victor Dmitriev

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 147 KB
• Volume: 48
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.21248

✦ Synopsis

The radiation patterns are similar to those of the conventional monopole antenna, although at the fourth band some nulls can be observed and these nulls are deeper for the antenna with ellipticity of 0.5 in the E-plane. In spite of this degradation, the radiation patterns at the fourth band are similar to those of the conventional monopole antenna.

3. CONCLUSION

Several elliptical multiple-ring monopole antennas with different ellipticity ratios have been fabricated and measured. The results show that the widths of the resonance bands with regard to return loss can be controlled by the ellipticity ratio and wider bandwidth can be obtained by decreasing the ellipticity ratio. The radiation patterns were found to be similar to those of the conventional monopole antenna, although at higher frequencies some nulls did occur.

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