Antenna structure for optimizing isolation of signal and electronic device using same
An antenna structure serving as an emitter in a radar device with optimized isolation of signal comprises antenna array as the radiating element. The antenna array includes array units. Each array unit includes radiating units connected by a feeder. Radiation area of each radiating unit gradually decreases from a center of array unit to ends of array unit. A specified distance is defined between centers of adjacent radiating units along an extending direction of the feeder. The feeder transmits a current signal to the array units, the radiating unit emits a radar scanning beam based on the current signal.
1. An antenna structure of an electronic device, the antenna structure comprising:
an antenna array including an array unit, each array unit having a plurality of radiating units connected by a feeder; the feeder transmits a current signal to the array unit, and the radiating unit emits a radar beam based on the current signal;
wherein a radiation area of the radiating units gradually decrease from a center of the array unit to the ends of the array unit, and
wherein the centers of adjacent radiating units along an extending direction of the feeder are spaced by a distance;
wherein the antenna structure further comprises a co-planar waveguide; the co-planar waveguide comprises a plurality of the feeders, a grounding layer, and a plurality of slots; the number of feeders is same as the number of array units; each side of a feeder defines one slot, and the slot separates the feeder from the grounding layer; the feeders, the slots, and the grounding layer are coplanar with each other.
2. The antenna structure of claim 1 , wherein the radiating unit is substantially elliptical or rectangular shape; the distance of adjacent radiating units along an extending direction of the feeder is in a range from 0.4 mm to 0.5 mm.
3. The antenna structure of claim 1 , wherein a distance between adjacent radiating units is λ; λ represents a wavelength of a current signal transmitting in the feeder of the antenna structure.
4. The antenna structure of claim 1 , wherein a distance between adjacent array units is in a range from 0.5λ1 to 0.75λ1; λ1 represents a wavelength of a current signal from the antenna structure being transmitted in air.
5. The antenna structure of claim 1 , wherein the feeders and the grounding layer are made of metal material.
6. The antenna structure of claim 5 , wherein the antenna structure further comprises a grounding surface; the grounding surface is made of material, the grounding surface provides a ground voltage level to the antenna array.
7. The antenna structure of claim 6 , wherein the antenna structure further comprises a plurality of through holes; the through holes surround the feeders and the slots; the through holes connect the grounding layer and the grounding surface.
8. An electronic device comprising:
a dielectric slab; and
an antenna array including an array unit; each array unit having a plurality of radiating units connected by a feeder;
wherein a radiation area of the radiating units gradually decrease from a center of the array unit to the ends of the array unit, and
wherein the centers of adjacent radiating units along an extending direction of the feeder are spaced by a distance;
the antenna structure further comprises a co-planar waveguide; the co-planar waveguide comprises a plurality of the feeders, a grounding layer, and a plurality of slots; the number of feeders is same as the number of array units; each side of a feeder defines one slot, and the slot separates the feeder from the grounding layer; the feeders, the slots, and the grounding layer are coplanar with each other.
9. The electronic device of claim 8 , wherein the specified distance of the centers of adjacent radiating units along an extending direction of the feeder is in a range from 0.4 mm to 0.5 mm.
10. The electronic device of claim 8 , wherein a distance between adjacent radiating units is λ; λ represents a wavelength of a current signal transmitting in the feeder of the antenna structure.
11. The electronic device of claim 8 , wherein a distance between adjacent array units is in a range from 0.5λ1 to 0.75λ1; λ1 represents a wavelength of a current signal from the antenna structure being transmitted in air.
12. The electronic device of claim 8 , wherein the feeders and the grounding layer are made of metal material.
13. The electronic device of claim 12 , wherein the antenna structure further comprises a grounding surface; the grounding surface is made of material, the grounding surface provides a ground voltage level to the antenna array.
14. The electronic device of claim 13 , wherein the antenna structure further comprises a plurality of through holes; the through holes surround the feeders and the slots; the through holes connect the grounding layer and the grounding surface.
15. The electronic device of claim 12 , wherein the dielectric slab comprises a first surface and a second surface opposite to the first surface; the antenna array and the co-planar waveguide are disposed on the first surface, and the grounding surface is disposed on the second surface.
16. The electronic device of claim 8 , wherein an end of the feeder is electrically connected with the corresponding array unit, and another end of the feeder is electrically connected to a feeding portion of the electronic device.
17. The electronic device of claim 8 , wherein the array units are symmetrically arranged along the extending direction of the feeder; centers of the radiating units in the symmetrical array units are in a line along the Y axis; centers of the radiating units in the asymmetrical array units are spaced in the specified distance along the extending direction of the feeder.
18. The electronic device of claim 8 , wherein each radiating unit is substantially elliptical shape.
19. The electronic device of claim 8 , wherein each radiating unit is substantially rectangular shape.