Vishwanath Iyer, Andrew Cavanaugh, Sergey Makarov, R. High Gain Vivaldi Antenna for Radar and Microwave Imaging Applications International Journal of Signal Processing Systems Vol. The reflection coefficient between 4-4.75 GHz does degrade to about -8 dB. Comparing the reflection coefficient in 3 - 6 GHz range of the fabricated prototype and the model reveals an acceptable performance. The antenna realized gain achieved over the band 3-10 GHz at boresight is very close to the gain result. The proposed antenna covers the Federal Communications Commission defined UWB spectrum and has more than 3.5:1 impedance bandwidth (from 3 GHz to more than 11 GHz). Choose the two harmonic signal frequencies to be at 3 and 11 GHz respectively. In the xy-plane we will use the component of the electric field for analysis while in the xz-plane we will use the component of the electric field.Ĭreate Points in Far-Field and Calculate Electric Field Define the far-field sphere radius and the set of observation angles in azimuth and elevation. the xy-plane and the other at az = 0 degrees, i.e. The Vivaldi antenna, also known as a tapered slot antenna (TSA), is a type of linear-polarized planar antenna invented by Peter Gibson in 1978, who originally. Choose the angles over 2 orthogonal planes the first specified at elevation = 0 degrees, i.e. To understand this, calculate the maximum possible variation in time delay due to a harmonic signal at f_min and another at f_max over a set of observation angles in the far-field. This is because variations in the phase center directly translate to variations in time delay, which can impact range estimates between a transmitter and a receiver. An analysis of the phase center variation is critical for positioning systems. It can vary with frequency and observation angle. The phase center of an antenna is the local center of curvature of the far-field phase front.
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