CN-122026105-A - 915MHz microstrip antenna with customized size

Abstract

The invention discloses a 915MHz microstrip antenna with a customized size, and belongs to the technical field of microstrip antenna design. The microstrip antenna comprises a radiator patch, a floor layer and a medium substrate layer, wherein the radiator patch and the floor layer are positioned on the upper surface and the lower surface, the medium substrate layer is arranged in the middle of the radiator patch, a cross-shaped groove is formed in the center of the radiator patch and each quarter quadrant, the angle between the cross-shaped groove in the center and the cross-shaped groove in the quarter quadrant is 45 degrees, two slit grooves are added on each side of the radiator patch, the included angle between the two slit grooves is 90 degrees, one diagonal angle of the radiator patch is cut, and the size of the cut-out part is optimized, so that the working frequency of circular polarization is 915MHz. The invention can solve the small-volume wireless sensing communication requirement.

Inventors

• WANG KUOCHUAN
• HUANG QIANYU
• SUN FUTAO
• XU HUI
• LI WENFENG
• LU CHAO
• SUN HAITAO
• ZHANG ZHENGLONG
• LI XIAOGUANG
• PAN NING

Assignees

• 北京航天计量测试技术研究所

Dates

Publication Date

20260512

Application Date

20251125

Claims (5)

1. 1. The 915MHz microstrip antenna with the customized size is characterized by comprising a radiator patch, a floor layer and a dielectric substrate layer, wherein the radiator patch and the floor layer are positioned on the upper surface and the lower surface, and the middle interlayer is the dielectric substrate layer; The center of the radiator patch and each quarter quadrant are provided with a cross-shaped groove, the angle between the cross-shaped groove at the center and the cross-shaped groove at the quarter quadrant is 45 degrees, two slit grooves are added on each side of the radiator patch, the included angle between the two slit grooves is 90 degrees, one diagonal angle of the radiator patch is cut, and the size of the cut-out part is optimized, so that the circularly polarized working frequency is 915MHz.
2. 2. A custom sized 915MHz microstrip antenna according to claim 1, wherein each side of said radiator patch is provided with a rectangular protrusion.
3. 3. The custom-sized 915MHz microstrip antenna according to claim 2, wherein said dielectric substrate layer is a PCB with a dielectric constant of 16 and a thickness of 3 mm.
4. 4. A custom sized 915MHz microstrip antenna according to claim 3, wherein said floor is copper clad over its entire surface, and the symmetrical areas of the two side edges are slotted to form two separate small rectangular copper clad areas.
5. 5. A custom-sized 915MHz microstrip antenna according to claim 3 or 4, wherein a metallized via hole of 1mm diameter is provided at the center of the antenna, the hole core is connected to the radiator patch surface, and during assembly, a radio frequency coaxial lead is used, wherein the coaxial core wire passes through the metal via hole and is connected to the radiator patch surface by welding, the coaxial shield wire is screwed into a floor area welded near the via hole, and the shield wire is connected to the rear end system GND, so that the floor layer is connected to GND.

Description

915MHz microstrip antenna with customized size Technical Field The invention relates to the technical field of microstrip antenna design, in particular to a 915MHz microstrip antenna with a customized size. Background The wireless sensing technology is more and more widely applied in the related fields due to the characteristics of no cabling, flexible arrangement, convenient use and the like. The antenna types in the field of wireless sensing are mainly whip antennas, on-board antennas, microstrip antennas, FPC flexible printed board antennas and the like, wherein the performance of the on-board antennas and the performance of the FPC flexible printed board antennas are similar, the installation is convenient, the gain is lower than that of other antennas, the communication capacity is sacrificed, the whip antennas are best in performance and high in gain, but are required to be externally used and cannot be used in a limited-volume scene, the microstrip antennas are small in size and high in integration level, can be designed into specific shapes, and can achieve better antenna performance through design. Disclosure of Invention In view of this, the present invention provides a 915MHz microstrip antenna with a customized size, which can solve the small-sized wireless sensing communication requirement. A915 MHz microstrip antenna with customized size comprises a radiator patch, a floor layer and a dielectric substrate layer, wherein the radiator patch and the floor layer are positioned on the upper surface and the lower surface, and the middle interlayer is the dielectric substrate layer; The center of the radiator patch and each quarter quadrant are provided with a cross-shaped groove, the angle between the cross-shaped groove at the center and the cross-shaped groove at the quarter quadrant is 45 degrees, two slit grooves are added on each side of the radiator patch, the included angle between the two slit grooves is 90 degrees, one diagonal angle of the radiator patch is cut, and the size of the cut-out part is optimized, so that the circularly polarized working frequency is 915MHz. Further, a rectangular protrusion is designed on each side of the radiator patch. Further, the dielectric substrate layer is a PCB with a dielectric constant of 16 and a thickness of 3 mm. Further, the whole surface of the floor is coated with copper, grooves are formed in symmetrical areas on two side edges, and two independent small rectangular copper coating areas are formed. Further, a metallized via hole with the diameter of 1mm is formed in the center of the antenna, the hole center is communicated with the surface of the radiator patch, a radio frequency coaxial lead is adopted for connection during assembly, a coaxial wire core penetrates through the metal via hole and is welded and communicated with the surface of the radiator patch, a coaxial wire shielding wire is screwed into a floor surface area welded near the via hole, and the shielding wire is communicated with a rear-end system GND so that the floor layer is communicated with the GND. The beneficial effects are that: 1. The radiator patch of the invention is provided with the cross-shaped grooves at the center and each quarter quadrant, so that the surface current path can be increased, the resonant frequency of the antenna is reduced, and the antenna size is reduced. 2. The rectangular bulge for tuning is reserved at the edge of the radiator patch, and when the center working frequency point is offset due to machining errors, the shape of the antenna can be changed by cutting part of the rectangular bulge, so that the center working frequency point is tuned to achieve an ideal effect. 3. The antenna provided by the invention is provided with the floor layer, the design direction is the upper hemispherical polarization direction, and the mutual electromagnetic influence with the lower working circuit is avoided. Drawings Fig. 1 is a front view of a microstrip antenna of the present invention; FIG. 2 is a side view of a microstrip antenna of the present invention; FIG. 3 is a 3D pattern of antenna radiation; FIG. 4 is a schematic structural view of a floor layer; fig. 5 is a schematic view of the assembled antenna assembly; Fig. 6 is a simulation plot of an antenna standing wave ratio design. The radiator comprises a 1-radiator patch, a 1-1-edge slot, a 1-2-quadrant cross slot, a 1-3-center cross slot, a 1-4-diagonal corner cut, a 1-5-rectangular bulge, a 2-dielectric substrate layer, a 3-substrate layer, a 4-radio frequency coaxial lead, a 5-capacitor and a 6-metallized via hole. Detailed Description The invention will now be described in detail by way of example with reference to the accompanying drawings. As shown in fig. 1 and 2, the invention provides a 915MHz microstrip antenna with a customized size, which comprises a radiator patch 1, a floor layer 3 and a dielectric substrate layer 2, wherein the radiator patch 1 and the floor layer 3 are positioned