Four-array microstrip antenna applied to high-frequency wireless charging technology

Abstract

The utility model provides a four-array microstrip antenna applied to a high-frequency wireless charging technology, which comprises patch antennas arranged in a 2 * 2 array and a feed network connecting the four patch antennas, and the feed network comprises two identical T-shaped power dividers. Four output ports of the two T-shaped power dividers are respectively connected with a patch antenna through a first microstrip line, and input ports of the two T-shaped power dividers are connected through a second microstrip line. The four-array microstrip antenna provided by the utility model has a good transmission characteristic, and the radiation gain of the antenna array is improved.

Description

Technical Field

[0001] This disclosure relates to the field of wireless transmission, and in particular to a four-array microstrip antenna for use in high-frequency wireless charging technology. Background Technology

[0002] Antennas are passive devices that transmit radio frequency (RF) energy. To improve transmission distance and efficiency, high gain is required for the transmitting antenna. Common antennas in RF-related products include horn antennas, grid antennas, microstrip antennas, and phased array antennas. Among these, phased array antennas offer the best directivity. Compared to mechanical movement, phased array antennas have a smaller range of motion. However, the more precise the movement of the phased array's focal point, the larger the range of motion, leading to more complex design and increased cost. Therefore, phased array antennas are not considered. Horn antennas and grid antennas offer large bandwidth and high gain, but their bulky size also makes them unsuitable for high-frequency wireless charging technology.

[0003] A microstrip antenna consists of a ground plane and a thin metal sheet mounted on a dielectric substrate. Energy is transmitted or received through the interaction between the two. Considering subsequent integration requirements, a four-element microstrip antenna array can be used as the RF transmitting antenna. While the size of a microstrip antenna meets the requirements, its gain is lower than that of horn or grid antennas. To increase the transmission distance, the key lies in increasing the gain. Utility Model Content

[0004] To address at least one problem with the prior art, this disclosure provides a quad-array microstrip antenna for use in high-frequency wireless charging technology.

[0005] A four-array microstrip antenna for high-frequency wireless charging technology includes a 2×2 array of patch antennas and a feed network connecting the four patch antennas. The feed network includes two identical T-type power dividers. The four output ports of the two T-type power dividers are each connected to a patch antenna through a first microstrip line, and the input ports of the two T-type power dividers are connected through a second microstrip line.

[0006] In some implementations, the T-type power divider includes a first stage, a second stage, two third stages, and two fourth stages.

[0007] One end of the first segment is the input port, and the other end is connected to the midpoint of the second segment. The first segment is perpendicular to the second segment.

[0008] The two ends of the second segment are each connected to one end of the third segment, and the second and third segments are collinear.

[0009] Each third segment is connected to one end of a fourth segment at the other end, and the other end of the fourth segment is an output port.

[0010] In some implementations, the impedances of the first, third, and fourth segments are equal, and the impedance of the second segment is equal to that of the second microstrip line.

[0011] In some implementations, the impedance of the third segment is Z0, and the impedance of the second segment is Z1, where Z1 = Z0.

[0012] In some implementations, the spacing between two patch antennas connected to the same T-type power divider is 0.6 to 0.9.

[0013] In some implementations, the junction of the third and fourth segments has a chamfer, the length of which is 1.6W, where W is equal to the width of the fourth segment.

[0014] In some implementations, the length of the second segment is equal to 0.5.

[0015] In some embodiments, the patch antenna has a length of 3.9 cm and a width of 2.8 cm; one side of the patch antenna has a groove, and a first microstrip line is connected in the groove, which has a depth of 4.8 mm and a width of 12 mm.

[0016] In some embodiments, the second microstrip line is 3.2 cm long and 1 mm wide; the first segment is 1.5 cm long and 3 mm wide; the second segment is 3 cm long and 1 mm wide; the third segment is 1.6 cm long and 3 mm wide; the fourth segment is 5 mm long and 3 mm wide; and the first microstrip line is 1.4 cm long and 2 mm wide.

[0017] The four-array microstrip antenna of this invention has good transmission characteristics and improves the radiation gain of the antenna array. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a four-array microstrip antenna according to an exemplary embodiment of the present invention. Detailed Implementation

[0019] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0020] Please refer to Figure 1The four-array microstrip antenna used in high-frequency wireless charging technology includes a 2×2 array of patch antennas 1 and a feed network connecting the four patch antennas 1. The feed network includes two identical T-type power dividers 3. Each of the four output ports of the two T-type power dividers 3 is connected to a patch antenna 1 through a first microstrip line 4. The input ports of the two T-type power dividers 3 are connected through a second microstrip line 5.

[0021] The dielectric substrate of the four-array microstrip antenna is an FR-4 board, composed of multiple sheets of epoxy resin glass cloth. Considering cost and ease of material selection, the FR-4 board model is KB-6165. The KB-6165 board has a relative permittivity of 4.6 and a dielectric loss of 0.016.

[0022] The transmitter is a 4-element microstrip antenna array with a maximum input power of 100W. The total energy is fed in via an N-type connector N-KF2, which can handle high power input. A microstrip power divider is then used to distribute the fed energy across four radiating patches, allowing each patch to emit approximately 25W of RF energy. The energy feed point is chosen at the midpoint of the second microstrip line 5.

[0023] According to an exemplary embodiment of the present disclosure, the four-array microstrip antenna includes a T-type power divider comprising a first segment 31, a second segment 32, two third segments 33, and two fourth segments 34. One end of the first segment 31 is an input port, and the other end is connected to the midpoint of the second segment 32. The first segment 31 is perpendicular to the second segment 32. Both ends of the second segment 32 are connected to one end of a third segment 33. The second segment 32 and the third segment 33 are collinear. The other end of each third segment 33 is connected to one end of a fourth segment 34, and the other end of the fourth segment 34 is an output port.

[0024] According to an exemplary embodiment of the present disclosure, the impedances of the first segment 31, the third segment 33, and the fourth segment 34 are equal, and the impedance of the second segment 32 is equal to that of the second microstrip line 5.

[0025] According to an exemplary embodiment of the present disclosure, in a four-array microstrip antenna, the impedance of the third segment 33 is Z0, the impedance of the second segment 32 is Z1, and Z1 = Z0. For example, Z0 = 50Ω, Z1 = 70.7Ω.

[0026] According to an exemplary embodiment of the present disclosure, the spacing between the two patch antennas connected to the same T-type power divider 3 in the quad-array microstrip antenna is 0.6. Up to 0.9 When the spacing between the two patch antennas connected to the same T-type power divider 3 is 0.6... Up to 0.9 At this time, the radiation gain of the antenna array can be maximized.

[0027] According to an exemplary embodiment of the quad-array microstrip antenna of this disclosure, the junction of the third segment 33 and the fourth segment 34 has a chamfer, the length of which is 1.6W, where W is equal to the width of the fourth segment 34. The transmission characteristics are optimal when the chamfer length is approximately 1.6W.

[0028] According to an exemplary embodiment of the quad-array microstrip antenna of this disclosure, the length of the second segment 32 is equal to 0.5. .

[0029] According to an exemplary embodiment of the present disclosure, the patch antenna 1 has a length of 3.9 cm and a width of 2.8 cm; one side of the patch antenna 1 has a groove 2, and the first microstrip line 4 is connected in the groove 2. The groove 2 has a depth of 4.8 mm and a width of 12 mm.

[0030] According to an exemplary embodiment of the present disclosure, the second microstrip line 5 has a length of 3.2 cm and a width of 1 mm; the first segment 31 has a length of 1.5 cm and a width of 3 mm; the second segment 32 has a length of 3 cm and a width of 1 mm; the third segment 33 has a length of 1.6 cm and a width of 3 mm; the fourth segment 34 has a length of 5 mm and a width of 3 mm; and the first microstrip line 4 has a length of 1.4 cm and a width of 2 mm.

[0031] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A four-array microstrip antenna applied to high-frequency wireless charging technology, characterized in that, The application relates to a patch antenna (1) arranged in a 2*2 array and a feed network connecting the four patch antennas (1), the feed network comprising two identical T-type power dividers (3), four output ports of the two T-type power dividers (3) each being connected to a patch antenna (1) through a first microstrip line (4), and an input port of the two T-type power dividers (3) being connected to a second microstrip line (5). 2.The four-array microstrip antenna applied to high-frequency wireless charging technology according to claim 1, wherein, The T-type power divider comprises a first section (31), a second section (32), two third sections (33) and two fourth sections (34), One end of the first section (31) is the input port, and the other end is connected to the midpoint of the second section (32), the first section (31) being perpendicular to the second section (32), The two ends of the second section (32) are each connected to one end of the third section (33), the second section (32) being collinear with the third section (33), The other end of each third section (33) is connected to one end of the fourth section (34), and the other end of the fourth section (34) is the output port. 3.The four-array microstrip antenna applied to high-frequency wireless charging technology according to claim 2, characterized in that, The impedance of the first section (31), the third section (33) and the fourth section (34) is equal, and the impedance of the second section (32) is equal to that of the second microstrip line (5). 4.The four-array microstrip antenna applied to high-frequency wireless charging technology according to claim 3, characterized in that, The impedance of the third segment (33) is Z0, the impedance of the second segment (32) is Z1, Z1= Z0. 5.The four-array microstrip antenna applied to high-frequency wireless charging technology according to claim 1, wherein, The distance between the two patch antennas connected to the same T-type power divider (3) is 0.6 to 0.9 . 6.The four-array microstrip antenna applied to high-frequency wireless charging technology according to claim 2, wherein, The third section (33) and the fourth section (34) have a cut corner at the joint, and the length of the cut corner is 1.6W, wherein W is equal to the width of the fourth section (34). 7.The four-array microstrip antenna applied to high-frequency wireless charging technology according to claim 2, characterized in that, The length of the second segment (32) is equal to 0.5 . 8.The four-array microstrip antenna applied to high-frequency wireless charging technology of claim 1, wherein, The length of the patch antenna (1) is 3.9cm, and the width is 2.8cm; One side of the patch antenna (1) has a groove (2), the first microstrip line (4) is connected in the groove (2), the depth of the groove (2) is 4.8mm, and the width is 12mm. 9.The four-array microstrip antenna applied to high-frequency wireless charging technology of claim 2, wherein, The length of the second microstrip line (5) is 3.2cm, and the width is 1mm; the length of the first section (31) is 1.5cm, and the width is 3mm; the length of the second section (32) is 3cm, and the width is 1mm; the length of the third section (33) is 1.6cm, and the width is 3mm; the length of the fourth section (34) is 5mm, and the width is 3mm; the length of the first microstrip line (4) is 1.4cm, and the width is 2mm.

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