CN204289706U - A kind of is the three frequency microstrip antenna of positive nonagon ring-type based on defect ground structure housing - Google Patents

Abstract

The utility model provides a three-frequency microstrip antenna with a defect-based structure whose outer frame is a regular nine-sided ring, including a dielectric substrate, a radiation patch and a grounding plate, and the radiation patch and the grounding plate are symmetrical along the center line of the dielectric substrate Arrangement, the ground plate is under the back of the dielectric substrate, and the radiation patch includes a regular nonagonal patch with a circular groove, a circular patch, an equilateral triangle patch with a circular groove, the first vertical rectangular patch, the second Two vertical rectangular patches, a third vertical rectangular patch and a circular patch, there is a defect block composed of horizontal rectangles and regular triangles in the middle of the grounding plate. The tri-band microstrip antenna provided by the utility model is light in weight and small in size, can effectively reduce return loss, transmit higher frequency band bandwidth, and have multi-band characteristics and stability at the same time.

Description

A triple-band microstrip antenna with regular nonagonal ring-shaped frame based on defect ground structure

technical field

The utility model belongs to the field of antennas, in particular to a three-frequency microstrip antenna whose structural outer frame is a regular nine-sided ring based on defects.

Background technique

At present, in the field of wireless communication technology, there are two ways to achieve multi-frequency: one is to use ultra-wideband antennas to cover all frequency bands, but this method is only applicable to the situation where multiple frequency bands are relatively close to each other, which has great limitations ;Another method is to allow the antennas in the system to independently cover these frequency bands. This method is relatively common, but there are many technical difficulties, such as mutual coupling and interference between antenna units, and it takes up more space. So we hope to be able to achieve dual-band or multi-band on a single antenna, so as to avoid the problem of mutual interference between antennas.

Defected Ground Structure (DGS) is one of the newly developed technologies in the microwave field, which is developed from the photonic bandgap structure. This structure changes the distribution of the ground current by etching periodic or non-periodic patterns on the ground plane of the transmission line such as the microstrip line, thereby changing the frequency characteristics of the transmission line, which can realize the functions of exciting resonance frequency, suppressing harmonics, and increasing bandwidth. Defective ground structures are widely used in microwave circuit and antenna design.

Microstrip antennas have the advantages of light weight, small size, and easy fabrication. However, ordinary microstrip antennas generally have a large size, a single frequency, a narrow frequency band, and high loss. For this reason, microstrip antennas need to be improved in terms of reducing return loss, increasing antenna bandwidth and reducing size.

Utility model content

One of the purposes of the utility model is to provide a three-band microstrip antenna with a regular nine-sided annular frame based on defects. The tri-band microstrip antenna provided by the utility model is light in weight and small in size, and can effectively reduce the Wave loss, high frequency band bandwidth, and multi-band characteristics and stability.

A three-band microstrip antenna based on a defect-based structure whose outer frame is a regular nonagonal ring, including a dielectric substrate, a radiation patch, and a grounding plate. The radiation patch and the grounding plate are symmetrically arranged along the center line of the dielectric substrate, and the radiation patch The surface located on the dielectric substrate, the ground plate is below the back of the dielectric substrate, and the radiation patch includes a regular nonagonal patch with a circular groove, a circular patch, an equilateral triangle patch with a circular groove, and the first vertical rectangular patch. sheet, the second vertical rectangular patch, the third vertical rectangular patch and a circular patch, the grounding plate is a rectangular plate, and there is a defect block composed of a horizontal rectangle and a regular triangle in the middle;

The annular patch is connected to the top of the regular nonagonal patch with a circular groove through the first vertical rectangular patch, and the lower end corner of the regular nonagonal patch with a circular groove is connected to the third vertical rectangular patch. The equilateral triangle patch with the circular groove, the second vertical rectangular patch and the circular patch are located inside the regular nonagonal patch with the circular groove, and the equilateral triangle patch with the circular groove passes through the second vertical rectangular patch and the circular patch. The circular patch is connected to the bottom of the regular nonagonal patch with a circular groove, the horizontal rectangle in the defect block is located directly above the regular triangle, and the side of the horizontal rectangle and the side of the regular triangle are located on the same straight line.

Further, the dielectric substrate is an FR4 epoxy board, the relative permittivity ε _r is 4.4, the dielectric loss is 0.02, and the characteristic impedance is 50Ω.

Further, the length of the dielectric substrate is 39 mm, the width is 21 mm, and the thickness is 1.6 mm.

Further, the inner radius of the annular patch is 1.84mm, and the outer radius is 3.0mm; the length of the first vertical rectangular patch is 1.4mm, and the width is 1.3mm; The radius is 8.79mm, the radius of the circumcircle of the regular nonagon is 10.5mm, and the center of the circular groove is 0.8mm higher than the center of the circumcircle of the regular nonagon; the radius of the circular groove in the regular triangular patch with the circular groove is 2.6 mm, the side length of the regular triangle is 12.07mm, the center of the circular groove is 0.7mm lower than the center of the circumscribed circle of the regular nonagon; the length of the second vertical rectangular patch is 0.85mm, and the width is 0.7mm; the radius of the circular patch is 1.2mm; the length of the third vertical rectangular patch is 11mm, and the width is 2.6mm;

Further, the horizontal length of the ground plate and the width of the dielectric substrate are equal to 21mm, and the vertical width is 8.3mm; the length of the horizontal rectangular patch in the defect block is 6mm, and the width is 4.1mm. The bottom of the floor is 2.9mm; the side length of the equilateral triangle of the defective block is equal to the width of the third vertical rectangular patch, which is 2.6mm, and the distance between the center of the equilateral triangle and the bottom of the grounding plate is 2.7mm.

The beneficial effects of the utility model are that the tri-band microstrip antenna is light in weight and small in volume, can effectively reduce return loss, transmit higher frequency band bandwidth, and have multi-band performance and stability.

Description of drawings

Figure 1 is a schematic diagram of the front structure of the antenna of the present invention.

Figure 2 is a schematic diagram of the back structure of the antenna of the present invention.

Fig. 3 is a schematic diagram of various parameters on the front of the antenna of the present invention.

Figure 4 shows a schematic diagram of various parameters on the back side of the utility model.

Fig. 5 is a characteristic curve diagram of the return loss of the antenna of the present invention.

Fig. 6 shows the radiation pattern of the antenna of the present invention on the E plane at 2.45 GHz.

Fig. 7 shows the radiation pattern of the antenna of the present invention in the H plane at 2.45 GHz.

Fig. 8 shows the radiation pattern of the antenna of the present invention on the E plane at 3.5 GHz.

Fig. 9 shows the radiation pattern of the antenna of the present invention in the H plane at 3.5 GHz.

Fig. 10 shows the radiation pattern of the antenna of the present invention on the E plane at 5.5 GHz.

Fig. 11 shows the radiation pattern of the antenna of the present invention on the H plane at 5.5 GHz.

Detailed ways

The utility model will be described in detail below in conjunction with specific embodiments. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined with each other to achieve better technical effects.

Figure 1 is a schematic diagram of the front structure of the antenna of the present invention.

Figure 2 is a schematic diagram of the back structure of the antenna of the present invention.

As shown in Figures 1 and 2, the utility model provides a three-band microstrip antenna with a defect-based structure whose outer frame is a regular nonagonal ring, including a dielectric substrate 1, a radiation patch and a ground plate 2, and the radiation The patch and the ground plate 2 are symmetrically arranged along the center line of the dielectric substrate. The radiation patch is located on the upper surface of the dielectric substrate 1, and the ground plate 2 is below the back of the dielectric substrate 1. The radiation patch includes a regular nonagon with a circular groove Patch 3, circular patch 4, equilateral triangle patch 5 with round groove, first vertical rectangular patch 6, second vertical rectangular patch 7, third vertical rectangular patch 8 and circular patch 9, There is a defect block 10 composed of a horizontal rectangle and a regular triangle on the middle surface of the grounding plate 2;

Regular nonagonal patch with circular groove 3, circular patch 4, regular triangle patch with circular groove 5, first vertical rectangular patch 6, second vertical rectangular patch 7, third vertical rectangular patch The sheet 8 and the circular patch 9 are located on the upper surface of the dielectric substrate 1, the ground plate 2 is located on the lower surface of the dielectric substrate 1, and the annular patch 4 is connected to the regular nonagonal patch with a circular groove through the first vertical rectangular patch 6. Sheet 3 tops are connected, and the regular nonagonal patch 3 low end corner that has circular groove is connected with the 3rd vertical rectangular patch 8, has the equilateral triangle patch 5 of circular groove, the second vertical rectangular patch 7 and circle The shape patch 9 is located inside the regular nonagonal patch 3 that has a circular groove, and the equilateral triangle patch 5 that has a circular groove passes through the second vertical rectangular patch 7 and the circular patch 9 and the regular nonagonal patch 9 that has a circular groove. The bottoms of the nonagonal patches 3 are connected, the horizontal rectangle in the defect block 10 is located directly above the regular triangle, and one side of the horizontal rectangle and one side of the regular triangle are located on the same straight line.

The dielectric substrate 1 is an FR4 epoxy board, with a relative permittivity ε _r =4.4, a dielectric loss of 0.02, a feeding mode of microstrip line feeding, and a characteristic impedance of 50Ω.

The defective ground structure can excite and improve the resonant frequency and increase the impedance bandwidth. The defective ground structure of the utility model is obtained by etching the defective block 10 composed of a horizontal rectangle and an equilateral triangle at a suitable position of the ground plate, so there are three frequency bands in the antenna with wide bandwidth and good matching. The utility model obtains an antenna covering the working frequency bands of Bluetooth, RFID, WLAN and WiMAX without increasing the overall volume.

The high-frequency simulation software HFSS is used to simulate and optimize the design of different antenna structure parameters, and obtain the following relationship between optimal size and tuning, as shown in Figure 3 and Figure 4:

Fig. 3 is a schematic diagram of various parameters on the front of the antenna of the present invention.

Figure 4 shows a schematic diagram of various parameters on the back side of the utility model.

The length L of the dielectric substrate is 39mm, the width W is 21mm, and the thickness is 1.6mm;

The inner radius R1 of the annular patch 4 is 1.84mm, and the outer radius R2 is 3.0mm; the length L1 of the first vertical rectangular patch 6 is 1.4mm, and the width W1 is 1.3mm; the regular nonagonal patch 3 with a circular groove The radius R3 of the middle circular groove is 8.79mm, the radius R4 of the circumcircle of the regular nonagon is 10.5mm, and the distance d1 between the center of the circular groove and the center of the circumcircle of the regular nonagon is 0.8mm; The radius R5 of the circular groove in the triangular patch 5 is 2.6mm, the side length d2 of the equilateral triangle is 12.07mm, and the center distance d3 of the circular groove is lower than the circumcircle of the regular nonagonal circle is 0.7mm; the second vertical rectangle 7 pastes The piece length L2 is 0.85mm, and the width W2 is 0.7mm; the radius R6 of the circular patch 9 is 1.2mm; the length L3 of the third vertical rectangular patch 8 is 11mm, and the width W3 is 2.6mm; the horizontal length of the ground plate 2 is L4 The length equal to the width W of the dielectric substrate 1 is 21 mm, and the longitudinal width W4 is 8.3 mm; the length L5 of the horizontal rectangular patch in the defective block 10 is 6 mm, the width W5 is 4.1 mm, and the bottom margin of the horizontal rectangular patch is The distance d4 from the bottom of the grounding plate 2 is 2.9 mm; the side length d5 of the equilateral triangle in the defective block 10 is equal to the length of the width W3 of the third vertical rectangular patch 8, which is 2.6 mm, and the distance between the center of the equilateral triangle and the grounding plate 2 The distance d6 from the bottom end is 2.7mm.

The triple-frequency microstrip antenna provided by the utility model provides three impedance bandwidths of 0.18GHz, 0.70GHz and 0.80GHz, the working frequency bands are 2.31-2.49GHz, 3.10-3.80GHZ and 5.09-5.89GHz respectively, and the resonance frequency is 2.42GHz respectively , 3.46GHz and 5.44GHz. Fig. 5 is a characteristic curve diagram of the return loss of the antenna of the present invention. As shown in FIG. 5 , the return loss of the antenna of the present invention at the resonance point is -22.47dB, -21.87dB and -22.86dB, which shows the good matching characteristics of the antenna. Figure 6 and Figure 7 are the radiation patterns of the antenna on the E plane and H plane respectively at 2.45GHz, Figure 8 and Figure 9 are the radiation patterns of the antenna on the E plane and H plane at 3.5GHz, respectively, Figures 10 and Fig. 11 is the radiation pattern diagrams of the antenna on the E plane and the H plane respectively at 5.5 GHz. It can be seen from the figure that the radiation pattern characteristics of the tri-band microstrip antenna provided by the utility model are relatively stable in all working frequency bands and have good directivity. To sum up, the defective ground structure can increase the bandwidth of the antenna, making it have multi-band characteristics, good matching characteristics and stability.

Although some embodiments of the present invention have been given herein, those skilled in the art should understand that the embodiments herein can be changed without departing from the spirit of the present invention. The above-mentioned embodiments are only exemplary, and the embodiments herein should not be taken as limiting the scope of rights of the present utility model.

Claims (5)

1. A three-band microstrip antenna based on a defect-based structure whose outer frame is a regular nonagonal ring, including a dielectric substrate, a radiation patch and a grounding plate, and the radiation patch and the grounding plate are along the dielectric substrate The center line is arranged symmetrically, the radiation patch is located on the upper surface of the dielectric substrate, and the grounding plate is located below the back of the dielectric substrate. It is characterized in that the radiation patch includes a regular nonagon with a circular groove Patch, circular patch, regular triangle patch with circular groove, first vertical rectangular patch, second vertical rectangular patch, third vertical rectangular patch and circular patch, the grounding plate is a rectangular plate , there is a defect block composed of horizontal rectangles and regular triangles in the middle of the surface; The annular patch is connected to the top of the regular nonagonal patch with a circular groove through the first vertical rectangular patch, and one corner of the bottom end of the regular nonagonal patch with a circular groove is connected to the The third vertical rectangular patch is connected, and the equilateral triangle patch with a round groove, the second vertical rectangular patch and the circular patch are located inside the regular nonagonal patch with a circular groove , the equilateral triangular patch with circular grooves is connected to the bottom of the regular nonagonal patch with circular grooves through the second vertical rectangular patch and the circular patch, and in the defective block The horizontal rectangle is located directly above the regular triangle, and one side of the horizontal rectangle and one side of the regular triangle are located on the same straight line. 2. A three-band microstrip antenna based on a defect-based structure whose outer frame is a regular nonagonal ring as claimed in claim 1, wherein the dielectric substrate is an FR4 epoxy board, and the relative permittivity ε _r is 4.4, the dielectric loss is 0.02, and the characteristic impedance is 50Ω. 3. A kind of three-band microstrip antenna based on a defect-based structure whose outer frame is a regular nonagonal ring as claimed in claim 1, wherein the length of the dielectric substrate is 39mm, the width is 21mm, and the thickness is 1.6mm. 4. A kind of three-band microstrip antenna based on a defect-based structure whose outer frame is a regular nonagon ring as claimed in claim 1, wherein the inner radius of the annular patch is 1.84mm, and the outer radius is 3.0mm; the length of the first vertical rectangular patch is 1.4mm, and the width is 1.3mm; the radius of the circular groove in the regular nonagonal patch with circular grooves is 8.79mm, and the circumscribed nonagonal The radius of the circle is 10.5mm, and the center of the circular groove is 0.8mm higher than the center of the circumscribed circle of the regular nonagon; the radius of the circular groove in the regular triangle patch with the circular groove is 2.6mm, and the side of the regular triangle It is 12.07mm long, and the center of the circular groove is 0.7mm lower than the center of the circumscribed circle of the regular nonagonal patch in the regular nonagonal patch with the circular groove; the length of the second vertical rectangular patch is 0.85mm, and the width is 0.7mm; the radius of the circular patch is 1.2mm; the length of the third vertical rectangular patch is 11mm, and the width is 2.6mm. 5. A three-band microstrip antenna based on a defect-based structure whose outer frame is a regular nonagonal ring as claimed in claim 1, wherein the length of the ground plate is longer than the width of the dielectric substrate Equal to 21mm, the longitudinal width is 8.3mm; the length of the horizontal rectangle in the defective block is 6mm, the width is 4.1mm, and the bottom edge of the horizontal rectangle is 2.9mm away from the bottom end of the grounding plate; the equilateral triangle in the defective block The length of the side is equal to the width of the third vertical rectangular patch, which is 2.6 mm, and the center of the regular triangle in the defective block is 2.7 mm from the bottom end of the ground plate.