| CPC H01Q 15/0086 (2013.01) [H01Q 1/50 (2013.01); H01Q 13/10 (2013.01); H01Q 21/064 (2013.01)] | 6 Claims |
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1. A dual-polarized broadband millimeter-wave filtering antenna based on a meta-surface, comprising two layers of stacked dielectric substrates, wherein an upper surface and a lower surface of a lower-layer dielectric substrate are provided with an upper-layer metal ground and a lower-layer metal ground, respectively; an upper surface of an upper-layer dielectric substrate is provided with a meta-surface structure; the meta-surface structure comprises N metal patches, which are arranged in an array; a slot is etched on each metal patch; the upper-layer dielectric substrate is connected to the upper-layer metal ground; a Jerusalem cross slot is etched on the upper-layer metal ground;
N is equal to four; two slots of a cross slot formed by the four metal patches arranged in an array are parallel to two slots of the Jerusalem cross slot; the meta-surface structure is arranged at a 45-degree included angle with the Jerusalem cross slot to introduce a first zero point of an upper side frequency;
four shorted metal branches, on the upper-layer dielectric substrate, are located on angular bisectors of included angles of the Jerusalem cross slot; long sides of the four shorted metal branches are parallel to the angular bisectors of the included angles to generate a zero point at a lower side frequency and form a lower stopband;
slots etched on each metal patch are two L-shaped slots; and the two L-shaped slots are symmetrical about a diagonal of the metal patch and are perpendicular to adjacent edges of the metal patch, so that a higher-order mode of the meta-surface structure is shifted towards a low frequency to improve the roll-off property of a passband edge; and a second zero point of an upper side frequency is introduced to improve a high-frequency out-of-band suppression level.
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