The three-dimensional frequency selective surface (3D FSS) with band reject multiple transmission zeros and pseudo-elliptic response is designed from two-dimensional (2D) periodic array of shielded micro strip lines to realize wide out-of–band radio wave rejection. The 3D FSS array consists of multimode cavities whose coupling with air can be controlled to obtain a desired frequency range. The proposed FSS with shorting via to ground exhibits pseudo-elliptic band-reject response in the frequency range from 6GHz to 14GHz. As the plane wave of linear polarization incidents perpendicularly to the shielded micro strip line with perfect electric conductor (PEC) and perfect magnetic conductor (PMC) boundary walls, two quasi-TEM modes are obtained known as air mode and substrate mode. The first 3D FSS design is a combination of two or more resonators. Furthermore, second 3D FSS design with three shorting vias result more elliptic band reject frequency response and a pass band transmission pole. All in phase resonators of design give transmission poles and out of phase combination of resonators give transmission zeros respectively. The proposed 3D FSS is designed and simulated using Ansys HFSS software. These designs exhibit an improved performance for many practical applications such as antenna sub-reflector, and spatial filters.
The designed micro-strip ultra-wideband (UWB) antenna is based on a travelling wave propagating along the tapered surface with a phase velocity less than the speed of light. It results in end-fire radiation with a good penetration and resolution characteristics. The designed antenna for microwave imaging (MI) works on a technique which requires the measurement of reflected electromagnetic waves by the object under test. The UWB antenna with overall size of 70x40x1 mm using Rogers RO3003 substrate with a relative permittivity of 3 is designed using ANSYS-HFSS software. The results for the frequency band 3 to 20 GHz are optimized on the parameters return loss, VSWR and gain. The effect of different medium on the parameters of antenna is also tested. The designed UWB antenna has obtain return loss better than -10dB and VSWR less than the 1.8 within the band (3GHz to 20GHz). The designed UWB microstrip antenna has wide practical application in concealed weapon detection, medical imaging, remote sensing, through the wall imaging etc.
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