Dual-polarized broadband millimeter-wave filtering antenna based on meta-surface, and communication device
Disclosed in the present disclosure are a dual-polarized broadband millimeter-wave filtering antenna based on a meta-surface, and a communication device. The dual-polarized broadband millimeter-wave filtering antenna based on a meta-surface comprises two layers of dielectric substrates, which are arranged in a stacked manner, wherein an upper surface and a lower surface of a lower-layer dielectric substrate are respectively provided with an upper-layer metal ground and a lower-layer metal ground, 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, and a Jerusalem cross slot is etched on the upper-layer metal ground. The antenna has a simple structure, and radiation and filtering can be realized at the same time without increasing the size of the antenna, thereby greatly reducing the volume of a radio-frequency front end and without any extra insertion loss.
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.
2. The dual-polarized broadband millimeter-wave filtering antenna based on the meta-surface according to claim 1 , further comprising a metal shorted pin, wherein the shorted metal branches are arranged below the metal patches and are located in the upper-layer dielectric substrate; and one end of the metal shorted pin is connected to the shorted metal branches, and the other end is connected to the upper-layer metal ground.
3. A communication device, comprising the dual-polarized broadband millimeter-wave filtering antenna based on the meta-surface according to claim 1 .
4. The dual-polarized broadband millimeter-wave filtering antenna based on the meta-surface according to claim 1 , further comprising two coplanar metal strip feeding lines, located directly below the Jerusalem cross slot, wherein the two metal strip feeding lines are orthogonal through a metal bridge of a short strip line.
5. The dual-polarized broadband millimeter-wave filtering antenna based on the meta-surface according to claim 4 , wherein an isolation structure is adopted around the metal strip feeding lines and the Jerusalem cross slot.
6. The dual-polarized broadband millimeter-wave filtering antenna based on the meta-surface according to claim 1 , wherein a spacing between adjacent metal patches is 0.01 λg0 to 0.3 λg0, wherein λg0 is a dielectric effective wavelength corresponding to a center frequency of the antenna.