Antennas for UWB Applications

Abstract

Antennas for UWB Applications" chapter deals with an overview of ultrawideband (UWB) antennas used for different applications. Some fundamental and widely used radiators, such as fat monopole, microstrip-fed and coplanar waveguide (CPW)-fed slot antennas, and tapered end-fire antennas are presented. Selected antenna designs are presented in relation to the UWB applications and their dictating radiation and operation principles. The demonstrated UWB antennas include antennas for handheld devices used for personal area network (PAN) communications; antennas for localization and positioning; UWB antennas for radio-frequency identifications (RFIDs); radar antennas for through-wall imaging, for ground-penetrating radar (GPR), and for breast tumor detection; and more generally, UWB antennas used for sensing. For some of the aforementioned applications, UWB antennas with special characteristics are needed, and they are presented and associated with the relevant applications. These include reconfigurable UWB antennas, metamaterial-loaded UWB antennas, and conformal UWB antennas. The usefulness of these special characteristics in comparison with the claimed advantages is critically evaluated. For the UWB applications presented in the chapter, one type or UWB antenna is recommended.

Development of a Triple Band Notched UWB Antenna

“…The novelty of the design lies in the combination of a modified EBG and a slot for frequency notching. This method successfully notched three frequencies with only two notching devices, unlike the conversionary method, which could notch only one frequency per notching device [24][25][26]. The analysis shown in this study revealed that a triple-band frequency notch could be achieved without degrading the performance of the antenna.…”

Sinuous Antenna for UWB Radar Applications

“…Furthermore, the frequency-dependent characteristics of the antennas and the time-domain effects and properties have to be known [ 31 ]. There are different types of antennas used in UWB systems, such as planar microstrip, monopole over a metal plate, printed monopole and dipole, stacked patch, tapered slot, metamaterial, dielectric resonantor, TEM horn, and self-similar antennas [ 1 , 2 , 32 ]. Methods to categorize these antennas can be highlighted in terms of their operating frequency, geometry, function, materials, and so on.…”