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.