By Daniel Valderas, Juan Ignacìo Sancho, David Puente, Cong Ling, Xiaodong Chen
Ultrawideband (Uwb) expertise, situated because the leading edge of study and improvement, paves how one can meet the rising calls for set through broadband instant purposes, comparable to high-speed information transmission, clinical imaging, short-range radars, electromagnetic checking out, and so forth. This breathtaking source builds upon the fundamentals of Uwb know-how to supply a whole compilation of figures of benefit besides an essential cutting-edge of the various antenna choices which are to be hired in response to the categorical program. with out over the top recourse to arithmetic, this quantity emphasizes at the Uwb antenna layout and equips readers with useful prediction ideas in keeping with uncomplicated formulation and versions. the massive photo of Uwb antenna expertise wouldn't be whole with out addressing its purposes, and this may serve to supply specialists with key clues for industry hole research. Containing over a hundred and fifty aiding illustrations and figures, this finished evaluate of Uwb know-how, antenna layout and purposes is a crucial resource of knowledge and reference for R&D companies, researchers, practitioners, specialists, Rf execs and verbal exchange engineers.
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Extra info for Ultrawideband Antennas: Design and Applications
The feed point is located between the two closest ends of the spiral arms. The radiation pattern is of the cos(θ) type, having poor directivity. Some applications require a unidirectional pattern. This can be achieved by mounting the arms of the spiral on a cone (Dyson, 1959). The principal disadvantage of this type of antenna is the feed, which must be balanced over the whole of the band. Typically, a coaxial cable is used, which is an unbalanced line. It is therefore necessary to use a wideband balun.
Instead of a flat disk, a wide-angle (θk = 70◦ ) metal cone is used. This gives excellent broadband matching of 100:1 and acceptable omnidirectionality in the radiation pattern over the whole of the band. Fig. 4. Discone antenna parameters. September 7, 2010 34 15:47 9in x 6in b966-ch03 Ultrawideband Antennas: Design and Applications Fig. 5. Diamond antenna. Fig. 6. Bow-tie antenna. 2. 2D biconical antennas This family of antennas is based on the biconical antenna described above. One example inspired by this, although not frequency-independent, is the diamond antenna which is very popular in UWB systems.
In this way, bandwidths of 8:1 have been obtained (Chen and Chia, 2000b). However, one of the monopoles must be considerably longer than the other in order to prevent any frequencies being filtered out. 2. Use of a short-circuit pin Another design technique for planar monopoles consists in using short-circuit pins in the areas with high current density (see Fig. 19). In addition to providing greater bandwidth, this is also useful for making the antenna more compact. Bandwidth September 7, 2010 15:47 9in x 6in b966-ch03 Classification of UWB Antennas Fig.