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This paper presents a microwave planar lens formed by a multilevel frequency selective surface (FSS) aimed at increasing the gain of a radially-corrugated horn antenna. The FSS is formed by three layers of square loops with open stubs. The phase compensation is achieved by shifting the resonant frequency of the unit cell. To do so, only the length of the stubs is suitably adjusted, leaving the rest...
This paper presents a non-uniform frequency selective surface (FSS) working as a low-profile planar lens antenna. The FSS is designed using multilayer band-pass unit cells, in contrast to previously-designed planar lenses with multilayer metallic hole arrays. The advantage of the new unit cell resides in its smaller size compared to the metallic holes. These smaller cells provide a better control...
This paper presents a low-profile antenna based on the use of a multilevel metallic hole array (MHA). The antenna is fed by an open rectangular waveguide placed at a short distance from the MHA. The array operates as a frequency selective surface (FSS) to enhance the directivity of the rectangular aperture within the frequency band of operation of the FSS. The small distance between layers gives the...
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