TIME DOMAIN CHARACTERISICS

One of the important characteristics of UWB antenna is its time domain behavior in the UWB operating frequency. Maintenance of high degree of correlation between the transmitted and received pulse is required to avoid the distortion in both transmitting and receiving modes. Fidelity factor is used to calculate the correlation between the transmitted and received pulses is a well-defined parameter whose expression is given by
\(F={max_{\tau}}\left|\frac{\int_{-\infty}^{\infty}s(t)r(t-\tau)dt}{\sqrt{\int_{-\infty}^{\infty}s(t)^2dt*\int_{-\infty}^{\infty}r(t)^2\text{dt}}}\right|\)———————————–(3)
Where s(t) and r(t) are the transmitted and received pulses respectively. The incorrect reception of the output signalr(t) results from the non-ideal behavior of the channels and antennas. Hence the UWB antenna should be properly designed to avoid any loss of information to fit a set of time domain characteristics. As frequency domain, the time domains characteristics in UWB antennas are equally essential. In transmitting as well as receiving mode the UWB antenna must have the minimum distortion. For the investigation of the time-domain behavior of the proposed UWB notch antenna, two identical replicas of the proposed UWB notch antenna are kept face-to-face maintaining the distance of 65 cm between the two identical proposed UWB notch antennas as shown in the figure 14.