A π/4 bi-orthogonal monopole antenna for operation on and beyond of the UWB band

✍ Scribed by M. A. Peyrot-Solis; G. M. Galvan-Tejada; H. Jardon-Aguilar

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 661 KB
• Volume: 21
• Category: Article
• ISSN: 1096-4290
• DOI: 10.1002/mmce.20494

✦ Synopsis

An ultra-wideband (UWB) p/4 bi-orthogonal monopole antenna with a highly omnidirectional radiation pattern in the azimuthal plane with a quasi-independent on the frequency behavior is presented in this article. Here, it is shown that by combining two orthogonal UWB planar monopole elements rotated 45 with respect to each other in a single structure, it is possible to enhance the performance of the radiation pattern at high frequencies of the operational bandwidth without affecting the radiation pattern at lower frequencies. The measured antenna bandwidth goes from 2.82 to 16.7 GHz for a reflection coefficient lower than À10 dB. The radiation pattern remains almost omnidirectional, and it is enhanced with respect to a conventional single planar monopole antenna of similar characteristics. The basic element used for both the single and the proposed p/4 bi-orthogonal UWB planar monopole antenna has a rectangular shape, whose impedance bandwidth ratio is achieved based on the bevelling and height-width ratio techniques. Although the antenna prototype presented in this article has an operational bandwidth of 13.88 GHz, it is possible to design a UWB monopole antenna with the shape and structure proposed here, but for different bandwidths following a design methodology suggested also in this article.