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The paper presents a small broadband monopole antenna. The proposed structure consists of a circular disk-loaded monopole and a probe with a circular spiral strip line monopole. Broad bandwidth can be achieved through electromagnetic coupling between these two monopoles that generate two resonances closely spaced in frequency. The antenna occupies a cylindrical volume with a radius of /spl rho/ /spl cong/ 0.04/spl lambda//sub o/ (5.5 mm) and a height of h /spl cong/ 0.08/spl lambda//sub o/ (11 mm) and has 430 MHz of impedance bandwidth for VSWR<2 with a center frequency at 2.185 GHz, which is fractional bandwidth of approximately 19.7%. The gain of the antenna is more than 1.7 dBi within the entire bandwidth with good omnidirectional radiation characteristics.
Published in:
Antennas and Wireless Propagation Letters, IEEE
(Volume:2
,
Issue:
1
)
Date of Publication: 2003
- Page(s):
- 349 - 351
- ISSN :
- 1536-1225
- INSPEC Accession Number:
- 7919356
- Digital Object Identifier :
- 10.1109/LAWP.2004.824171
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 23 February 2005
- Issue Date :
- 2003
- Sponsored by :
- IEEE Antennas and Propagation Society
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