#Vivaldi tapered slot simulator

Gibson, “The Vivaldi aerial,” in 9th IEEE European Microwave Conf., Brighton, UK, pp. The obtained 2D microwave images of the test media successfully show that the hidden objects can effectively be located and detected using the proposed FSVA in conjunction with a simple imaging scheme. From the application point of view, the fabricated antenna is used to image various metallic objects hidden inside the sand using a vector network analyzer and associated RF components. It is found that the directivity of FSVA is approximately doubled as compared to that of the conventional Vivaldi antenna having the same dimensions.

#Vivaldi tapered slot simulator

The measured result shows a good agreement with the numerical simulation performed using the EM Simulator i. e. The proposed antenna prototype is designed and fabricated on a 1-mm thick FR-4 substrate (ɛ r=4.3, tanδ=0.025), and the return loss and radiation characteristics are investigated in the anechoic environment. For feeding the FSVA, a binomial three-section V-shaped even mode power divider with progressing T-junctions is also designed and tested here, which is then integrated with the antenna. To improve the directivity of the conventional Vivaldi antenna, a four-slot Vivaldi antenna (FSVA) is proposed here to operate in the frequency range of 2–11 GHz. 21-23rd 2010.The conventional tapered slot Vivaldi antenna is well known for its ultra-wide band characteristics with low directivity. Duckworth,'Self-Supporting Coaxial Antenna with an Integrated Balun and a Linear Array Thereof', Proceedings of the Antenna Application Symposium, Allerton Park, Monticello, IL, pp.282-284, Sep. 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. 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.