An UWB Conical Monopole Antenna for Multiservice Wireless Applications

A novel formation of a conical monopole antenna is presented for ultra-wideband (UWB) and multiple other wireless services. The proposed antenna design is compatible with many wireless standards, including Wi-Fi (2.4 GHz), Bluetooth (v1.0-v4.0), WiMAX ( ~ 2.5-5.5 GHz) and Bluetooth 4.0 or Wireless USB (3.1-10.6 GHz). It is also has a suitable frequency response for close range radar and satellite communication in the X band ( ~ 8-12 GHz) and Ku band ( ~ 12-18 GHz) applications. The proposed design is approximately 0.24λ in length with respect to the lowest frequency boundary at the 2.4 GHz Wi-Fi band. The structure consists of two mechanical parts, which are the cone and a cylindrical block (disc). The proposed conical monopole antenna displays a fractional bandwidth of 8.3:1 and a simulated maximum efficiency of over 95% across the whole frequency range. The radiation patterns are largely omnidirectional. Furthermore, it displays a useful level of gain across the impedance bandwidth and the time domain response indicates promising performance for radar and impulse radio. In short, the proposed conical monopole offers ultra-broad bandwidth with omnidirectional radiation patterns, in a reasonably small and easy to construct structure.