Dual-Polarized Microstrip Antenna

• US 20130044035A1
• Filed: 04/19/2011
• Published: 02/21/2013
• Est. Priority Date: 09/07/2010
• Status: Active Grant

• Current Assignee: Kunjie Zhuang
• Original Assignee: Kunjie Zhuang
• Inventors: Zhuang, Kunjie
• Granted Patent: US 9,030,364 B2
• Time in Patent Office: Days
• US Class Current: 343/770
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: H01Q 5/50 Feeding or matching arrangements for broad-band or multi-band operation
• CPC Class Codes: H01Q 9/0414 in a stacked or folded configuration
• CPC Class Codes: H01Q 9/0428 radiating a circular polarised wave
• CPC Class Codes: H01Q 9/0457 electromagnetically coupled to the feed line

Abstract

A dual-polarized microstrip antenna includes: at least one metal radiating patch, i.e. a first metal radiating patch; at least one ground metal layer whereon excitation micro-slots are etched; at least one dielectric layer, i.e. a first dielectric layer it is preferred that the dielectric layer is a resonant dielectric layer such as a resonant dielectric layer of air or other layers of optimization resonant materials; at least one set of bipolar excitation microstrip lines; the dielectric layer is between the first metal radiating patch and the ground metal layer. The dual-polarized microstrip antenna of multi-layer radiation structure is designed in a relatively small volume, which effectively saves the cost of antenna installation and maintenance, and is widely applied in the fields of mobile communication and internet technology.

Claims

1. A dual-polarized microstrip antenna comprising:

at least a first metal radiating patch;

at least one ground metal layer whereon excitation micro-slots are etched;

at least a first dielectric layer, which is preferably a resonant dielectric layer, particularly a resonant dielectric layer of air or a layer of other optimization resonant materials, wherein the dielectric layer is positioned between the first metal radiating patch and the ground metal layer; and

at least one set of bipolar excitation microstrip lines.

2. The dual-polarized microstrip antenna unit according to claim 1, further comprising an independent VSWR adjustment unit connected with the first metal radiating patch, wherein the metal radiating patch is circular.

3. The dual-polarized microstrip antenna according to claim 1, wherein the excitation micro-slots are two discretely vertical H-shaped excitation micro-slots with the same dimensions, that is, the two H-shaped excitation micro-slots are not in contact that and preferably the H-shaped excitation micro-slots are identical in dimensions so as to ensure that the dual-polarized antenna has consistent radiation performance optimization in the two polarization directions, and preferably the cross arms “

-”

of the two H-shaped excitation micro-slots are mutually vertical for the purpose of guaranteeing excellent polarization isolation of the dual-polarized antenna.

4. The dual-polarized microstrip antenna according to claim 1, wherein the thickness of the dielectric layer ranges from 1 to 40 mm and preferably from 2 to 10 mm;

and a dielectric substrate is arranged between the bipolar excitation microstrip lines and the ground metal layer, and the thickness of the dielectric substrate ranges from 0.2 to 5 mm and preferably from 0.5 to 2 mm.

5. The dual-polarized microstrip antenna according to claim 3, wherein front ends of the two excitation microstrip lines are linear and preferably the front end of each excitation microstrip line is vertical to the cross arm “

-”

of one H-shaped excitation micro-slot, and the front ends pass through the middle points of the cross arms “

-”

of the respective H-shaped excitation micro-slots;

the front ends of the two excitation microstrip lines are discretely vertical for the purposes of guaranteeing the polarization isolation of the dual-polarized antenna and leading it to be used as two independent antennas;

the distance between the two discrete front ends, which are not in contact ranges from 1 to 8 mm; and

the perpendicularity between the two discrete front ends which are not in contact, ranges from 60 to 90° and

preferably 90°

.

6. The dual-polarized microstrip antenna according to claim 3, wherein the two H-shaped excitation micro-slots are identical in size, width, slot depth, slot width and shape, and preferably two ends of the single cross arm “

-”

of each H-shaped excitation micro-slot intersect with middle points of the two vertical arms “

|”

, and preferably the single cross arm “

-” and

the two vertical arms “

|”

of each H-shaped excitation micro-slot are linear;

preferably the single cross arm “

-”

of each H-shaped excitation micro-slot is vertical to the two vertical arms “

|”

thereof preferably the virtual extension line of the cross arm “

-”

of at least one H-shaped excitation micro-slot squarely passes through the middle point of the cross arm “

-”

of the other H-shaped excitation micro-slot preferably at least one straight line passing through the central point of the first metal radiating patch is positioned on the vertical surface of the cross arm “

-”

of at least one H-shaped excitation micro-slot, the vertical surface squarely passes through the middle point of the cross arm “

-”

of the other H-shaped excitation micro-slot, and the vertical surface is vertical to the plane on which the slot bottom of the former H-shaped excitation micro-slot is positioned;

that preferably the slot bottoms of the two H-shaped excitation micro-slots are on the same plane and the slot surfaces of the two H-shaped excitation micro-slots are on the same plane;

in an area of the same shape and size on the ground metal layer vertically projected by the first metal radiating patch, that preferably each H-shaped excitation micro-slot independently occupies half the area of the same shape and size, each H-shaped excitation micro-slot or the length of the cross arm “

-”

of each H-shaped excitation micro-slot or the total length of the cross arm “

-” and

the two vertical arms “

|”

of each H-shaped excitation micro-slot is maximized, and the total slot area of each cross arm “

-” and

the two vertical arms “

|”

of each H-shaped excitation micro-slot is maximized.

7. The dual-polarized microstrip antenna according to claim 6, further comprising a second dielectric layer, wherein preferably the second dielectric layer is a resonant dielectric layer, particularly a resonant dielectric layer of air or a layer of other optimization resonant materials.

8. The dual-polarized microstrip antenna according to claim 7, wherein the second dielectric layer comprises a slot cavity used to prevent the impact among arrays during the arrayed use of the antenna;

and wherein the height of the slot cavity depends on the relevance/isolation parameters determined in an ultimate antenna application.

9. The dual-polarized microstrip antenna according to claim 8, wherein the slot cavity formed above the ground metal layer by a metal support for system ground, of which the depth ranges from 0.5 to 20 mm;

and wherein when the first and the second dielectric layers are air layers and no other radiating patches or components are arranged above the second dielectric layer, the first and the second dielectric layers are connected into a whole and the second dielectric layer serves as one part of the first dielectric layer.

10. The dual-polarized microstrip antenna according to claim 7, wherein the heights and lengths of the radiating patch, the dielectric layers, and the ground metal layer are determined based on frequency band and wavelength.

11. The dual-polarized microstrip antenna according to claim 10, further comprising a second metal radiating patch, wherein the second metal radiating patch is identical to the first metal radiating patch in material, thickness and shape;

and preferably the size of the second metal radiating patch is freely optimized according to the requirements for widening the frequency band;

preferably the size of the second metal radiating patch is ±

20% of that of the first metal radiating patch; and

it is and, preferably the second metal radiating patch is arranged above the second dielectric layer so as to separate the first dielectric layer into two areas being a lower part and an upper part, where the lower part is preferably the slot cavity and the upper part is preferably a first dielectric layer area between the first and the second metal radiating patches.

12. The dual-polarized microstrip antenna according to claim 11, further comprising:

an air dielectric layer, namely air dielectric layer A, providing an undisturbed work space height for the excitation microstrip lines interfaced with a source, wherein the work space height exceeds λ

/N when N is about 10-8; and

a metal reflection ground baseplate for providing excellent backward radiation isolation for radiating units and providing convenient system ground for source parts, feed source parts or radiating units.

29. The wireless communication relay station employing the dual-polarized microstrip antenna in accordance with claim 1, including at least one dual-polarized microstrip antenna, wherein, preferably, an input port of the dual-polarized microstrip antenna is connected with a retransmission end of a relay station.

30. A wireless communication base station employing the dual-polarized microstrip antenna in accordance with claim 1, comprising at least one dual-polarized microstrip antenna.

31. A communication system employing the dual-polarized microstrip antenna in accordance with claim 1, comprising at least one piece of equipment equipped with the dual-polarized microstrip antenna.

13. A dual-polarized microstrip antenna comprising at least two dual-polarized antenna units connected together through power divider, wherein each dual-polarized antenna comprises:

a first air dielectric layer, a first metal radiating patch, a second air dielectric layer, a ground metal patch, a first dielectric substrate, bipolar excitation microstrip lines, a third air dielectric layer and a metal reflection baseplate, that are sequentially arranged from top to bottom.

14. The dual-polarized microstrip antenna according to claim 13, wherein the first metal radiating patch is connected with an antenna cover through an insulation screw, the ground metal patch covers an upper end surface of the first dielectric substrate and is fixedly connected with a hollow metal support fixed on the metal reflection baseplate, bipolar excitation microstrip lines, of which the front ends are orthogonal but not in contact, are arranged on a lower end surface of the first dielectric substrate, and two stimulated radiation micro-slots, orthogonal but not in contact, are formed on the upper end surface of the ground metal patch and correspond to the front ends of the bipolar excitation microstrip lines in an orthogonal way.

15. The dual-polarized microstrip antenna according to claim 13, comprising four dual-polarized antenna units connected together through the power divider in an antenna cover, wherein the power divider is a four-way power divider and wherein the four dual-polarized antenna units are distributed in a line in the antenna cover.

16. The dual-polarized microstrip antenna according to claim 15, wherein the first metal radiating patch is connected with the antenna cover through an insulation screw, the ground metal patch covers an upper end surface of the first dielectric substrate and is fixedly connected with a hollow metal support fixed on the metal reflection baseplate, bipolar excitation microstrip lines, of which the front ends are orthogonal but not in contact, are arranged on a lower end surface of the first dielectric substrate, and two stimulated radiation micro-slots, orthogonal but not in contact, are formed on the upper end surface of the ground metal patch and correspond to the front ends of the bipolar excitation microstrip lines in an orthogonal way.

17. The dual-polarized microstrip antenna according to claim 13, comprising four dual-polarized antenna units connected together through the power divider in an antenna cover, wherein the power divider is a four-way power divider and wherein the four dual-polarized antenna units are distributed in two lines and two rows in the antenna cover.

18. The dual-polarized microstrip antenna according to claim 17, wherein the first metal radiating patch is connected with the antenna cover through an insulation screw, the ground metal patch covers an upper end surface of the first dielectric substrate and is fixedly connected with a hollow metal support fixed on the metal reflection baseplate, bipolar excitation microstrip lines, of which the front ends are orthogonal but not in contact, are arranged on a lower end surface of the first dielectric substrate, and two stimulated radiation micro-slots, orthogonal but not in contact, are formed on the upper end surface of the ground metal patch and correspond to the front ends of the bipolar excitation microstrip lines in an orthogonal way.

19. The dual-polarized microstrip antenna according to claim 13, comprising:

two independent dual-polarized antennas in an antenna cover, wherein each dual-polarized antenna includes two of the dual-polarized antenna units connected together through the power divider, and wherein the power divider is a two-way power divider.

20. The dual-polarized microstrip antenna according claim 19, wherein the first metal radiating patch is connected with the antenna cover through an insulation screw, the ground metal patch covers an upper end surface of the first dielectric substrate and is fixedly connected with a hollow metal support fixed on the metal reflection baseplate, bipolar excitation microstrip lines, of which the front ends are orthogonal but not in contact, are arranged on a lower end surface of the first dielectric substrate, and two stimulated radiation micro-slots, orthogonal but not in contact, are formed on the upper end surface of the ground metal patch and correspond to the front ends of the bipolar excitation microstrip lines in an orthogonal way.

21. The dual-polarized microstrip antenna according to claim 13, comprising:

eight of the dual-polarized antenna units connected in an antenna cover through the power divider, wherein the power divider is an eight-way power divider.

22. The dual-polarized microstrip antenna according to claim 21, wherein the first metal radiating patch is connected with the antenna cover through an insulation screw, the ground metal patch covers an upper end surface of the first dielectric substrate and is fixedly connected with a hollow metal support fixed on the metal reflection baseplate, bipolar excitation microstrip lines, of which the front ends are orthogonal but not in contact, are arranged on a lower end surface of the first dielectric substrate, and two stimulated radiation micro-slots, orthogonal but not in contact, are formed on the upper end surface of the ground metal patch and are corresponding correspond to the front ends of the bipolar excitation microstrip lines in an orthogonal way.

23. The dual-polarized microstrip antenna according to claim 13, comprising:

four independent dual-polarized antennas in an antenna cover, wherein the dual-polarized antenna comprises two of the dual-polarized antenna units connected together through the power divider, wherein the power divider is a two-way power divider.

24. The dual-polarized microstrip antenna according to claim 23, wherein the first metal radiating patch is connected with the antenna cover through an insulation screw, the ground metal patch covers an upper end surface of the first dielectric substrate and is fixedly connected with a hollow metal support fixed on the metal reflection baseplate, bipolar excitation microstrip lines, of which the front ends are orthogonal but not in contact, are arranged on a lower end surface of the first dielectric substrate, and two stimulated radiation micro-slots, orthogonal but not in contact, are formed on the upper end surface of the ground metal patch and correspond to the front ends of the bipolar excitation microstrip lines in an orthogonal way.

25. The dual-polarized microstrip antenna according to claim 13, comprising four independent dual-polarized antennas in an antenna cover, the dual-polarized antenna comprising four of the dual-polarized antenna units connected together through the power divider, wherein the power divider is a four-way power divider.

26. The dual-polarized microstrip antenna according to claim 25, wherein the first metal radiating patch is connected with the antenna cover through an insulation screw, the ground metal patch covers an upper end surface of the first dielectric substrate and is fixedly connected with a hollow metal support fixed on the metal reflection baseplate, bipolar excitation microstrip lines, of which the front ends are orthogonal but not in contact, are arranged on a lower end surface of the first dielectric substrate, and two stimulated radiation micro-slots, orthogonal but not in contact, are formed on the upper end surface of the ground metal patch and correspond to the front ends of the bipolar excitation microstrip lines in an orthogonal way.

27. A dual-polarized microstrip antenna comprising:

a first air dielectric layer, a first metal radiating patch, a second air dielectric layer, a ground metal patch, a first dielectric substrate, excitation microstrip lines, a third air dielectric layer and a metal reflection baseplate, all being sequentially arranged from top to bottom in an antenna cover.

28. The dual-polarized microstrip antenna according claim 27, wherein the ground metal patch covers the upper end surface of the first dielectric substrate and is fixedly connected with a hollow metal support fixed on the metal reflection baseplate, stimulated radiation micro-slots are formed on the upper end surface of the ground metal patch, the first metal radiating patch is circular, where an adjusting screw is fixed in the center, and the first metal radiating patch is fixed through the threaded connection between the adjusting screw and the internal threads in the center of the antenna cover.