Estrada, "Microwave object detection and image reconstruction with a synthetic circular aperture", Master Thesis, University of Oslo, Oslo, Norway, 2018.ĭ. All these results suggest that the antenna is suitable for microwave imaging applications. The constructed antenna has a lower bandwidth than the simulated one, with operating frequencies of 3.5 GHz – 3.75 GHz and 4.25 – 10.89 GHz, respectively, and useable bandwidths of 250 MHz and 6.64 GHz. The increase in gain is proportional to the frequency of operation. In comparison to a typical single slot antenna, the suggested antenna provides a substantial boost in gain performance. Based on the modeling findings, the suggested antenna attain a bandwidth of 7.5 GHz with operating frequencies from 3.1 GHz to 10.6 GHz for a VSWR of less than two. The antenna is designed to operate at frequencies ranging from 3.1 to 10.6 GHz. The proposed Vivaldi antenna is designed using a double-slot structure method with the addition of corrugated edges and a semicircle director aimed at improving the gain. In this work, we present a high-gain Vivaldi antenna for microwave imaging applications. The antenna is utilized because of its simple, lightweight, and compact design, as well as its excellent efficiency and gain capabilities. The Vivaldi antenna is one of the most popular antennas for this purpose. 21-23rd 2010.Microwave imaging, such as images for radiological inspection in the medical profession, is one of the applications utilized in ultra-wideband (UWB) frequency ranges. 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.
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