A planar triangular monopole antenna for UWB communication

The paper presents a printed planar triangular monopole antenna (PTMA) for UWB communication. The HFSS 3D EM simulator is employed for design simulation. The printed PTMA is realized on an FR-4 PCB substrate. The measured VSWR is less than 3 from 4 GHz to 10 GHz. The measured phase distribution of the input impedance is quite linear and the H-plane patterns are almost omnidirectional in the UWB frequency band. To compute efficiently the far-field antenna parameters from the near-field over a wide frequency range, the Kirchhoff´s surface integral representation (KSIR) is used in the developed FDTD code to compute the time-domain far-field distribution. This is to investigate the radiated power density spectrum (PDS) shaping to comply with the FCC emission limit mask. The effect of various source pulses (first-order Rayleigh pulses with σ of 25, 50 and 100 ps) on the radiated PDS shaping is studied. It is found that the radiated PDS of the first-order Rayleigh pulse with σ=50 ps can comply with the FCC´s indoor mask from 2 GHz. As for the outdoor mask, the same pulse can comply with the FCC emission limit.