CN216251115U

CN216251115U - Microstrip PCB antenna

Info

Publication number: CN216251115U
Application number: CN202122700450.XU
Authority: CN
Inventors: 郑晓斌
Original assignee: Zhuhai Huge Ic Co ltd
Current assignee: Zhuhai Huge Ic Co ltd
Priority date: 2021-11-05
Filing date: 2021-11-05
Publication date: 2022-04-08
Anticipated expiration: 2031-11-05

Abstract

A microstrip PCB antenna comprising: the radiating sheet and the grounding sheet are arranged on the same side surface of the dielectric substrate; the radiating piece comprises a first antenna arm and a second antenna arm which are parallel to each other, the first antenna arm and the second antenna arm are connected through a first connecting part, the first connecting part is vertical to the first antenna arm, and the first antenna arm and the second antenna arm are positioned on the same side of the first connecting part; the grounding piece comprises a square base part, a third antenna arm and a fourth antenna arm, wherein the third antenna arm and the fourth antenna arm are parallel to each other and extend towards the same direction; the radiating piece is arranged between the third antenna arm and the fourth antenna arm, the first connecting portion and the square base portion are arranged adjacently, and the four antenna arms are parallel to each other. The utility model has small volume and is suitable for 902-928 MHz frequency bands.

Description

Microstrip PCB antenna

Technical Field

The utility model belongs to the technical field of wireless communication, and particularly relates to a small microstrip PCB antenna.

Background

Sub-GHz (frequency below 1GHz, 27 MHz-960 MHz) is one of the important fields of wireless communication, and its application covers many fields such as consumer electronics, automobiles, industry and medical treatment, for example, there are many applications in TV/STB/VCR/DVD/audio device remote controller, remote switch, lighting control, door remote switch, wireless POS device, etc. At present, the antenna products applied to the WIFI video chip near the 915MHz frequency point are few, and mainly comprise a glass fiber reinforced plastic antenna and a rubber-reinforced plastic copper tube antenna, although the two types of antennas can meet the requirement of video bandwidth, the appearance volume of the antenna is large, the antenna is difficult to apply to products which are compact in space and need to be embedded in the antenna, even the antenna is an external product, along with the fact that the requirements of people on product miniaturization and appearance are higher and higher, the existing antenna cannot meet the requirements of antenna performance and miniaturization.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a miniature microstrip line PCB antenna which has a frequency point near 915MHz, has good antenna transceiving performance and small volume and can meet the application requirement of compact antenna installation space.

In order to achieve the purpose, the utility model adopts the following technical solutions:

a microstrip PCB antenna comprising: the antenna comprises a dielectric substrate, a radiation piece and a grounding piece, wherein the radiation piece and the grounding piece are arranged on the dielectric substrate; the radiation sheet and the grounding sheet are arranged on the same side surface of the medium substrate; the radiating piece comprises a first antenna arm and a second antenna arm which are parallel to each other, the first antenna arm and the second antenna arm are connected through a first connecting part, the first connecting part is perpendicular to the first antenna arm and the second antenna arm, and the first antenna arm and the second antenna arm are located on the same side of the first connecting part; the grounding plate comprises a square base, a third antenna arm and a fourth antenna arm, wherein the third antenna arm and the fourth antenna arm are connected with the square base, the third antenna arm and the fourth antenna arm are parallel to each other, the third antenna arm and the fourth antenna arm extend to the same direction, the third antenna arm is connected with the top of the square base through a second connecting part perpendicular to the third antenna arm, the second connecting part is flush with the side edge of the square base, the fourth antenna arm is connected with the bottom of the square base, and the bottom edge of the fourth antenna arm is flush with the bottom edge of the square base; the radiating plate is arranged between the third antenna arm and the fourth antenna arm, the first connecting portion and the square base portion are arranged adjacently, and the first antenna arm, the second antenna arm, the third antenna arm and the fourth antenna arm are parallel to each other.

Further, the radiation plate feeding pad is disposed at a connection position of the first connection portion and the second antenna arm.

Further, the ground plate feed pad is disposed on the square base.

Furthermore, a slot is formed in the upper portion of the square base, the slot extends inward from the outer edge of the square base, and the slot is parallel to the third antenna arm.

Further, the length of the first antenna arm is 42 mm-48 mm.

Further, the length of the first antenna arm is less than the length of the second antenna arm, the second antenna arm extends beyond the third antenna arm and the fourth antenna arm, and the fourth antenna arm extends beyond the third antenna arm.

Further, the length of first antenna arm is 45.05mm, the length of second antenna arm is 76mm, the length of first connecting portion is 1.6mm, the width of first antenna arm, second connecting portion and first connecting portion is 1.5mm, the length of third antenna arm is 79.55mm, the width is 1.5mm, the length of fourth antenna arm is 64.05mm, the width is 1mm, the length of square base, width are 20 x 6.2 mm.

Furthermore, a gap extending inwards from the outer edge of the square base is formed in the upper portion of the square base, the gap is parallel to the third antenna arm, the length of the gap is 0.2mm, and the distance between the gap and the top edge of the square base is 1.5 mm.

Furthermore, the radiating patch further comprises a fifth antenna arm connected with the second antenna arm, the fifth antenna arm is parallel to the second antenna arm, the fifth antenna arm is connected with the end of the second antenna arm through a third connecting portion, the third connecting portion is perpendicular to the second antenna arm, and the fifth antenna arm extends from one end of the fifth antenna arm connected with the third connecting portion to the third antenna arm and is located on the same straight line with the third antenna arm.

Furthermore, the frequency band of the microstrip PCB antenna is 902-928 MHz.

According to the technical scheme, the microstrip PCB antenna adopts the specially designed patch structure, the patch structure is arranged on the PCB substrate, the miniaturization of the antenna is realized, the center frequency of the antenna is 915MHz, the application range covers the frequency band of 902-928 MHz, the microstrip PCB antenna has good transceiving performance, and the microstrip PCB antenna can meet the application requirements of communication modules used on video terminal products such as unmanned aerial vehicles, baby monitors, home local area network bridges and wireless visual doorbells.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

fig. 3 is a diagram of S11 parameters of the antenna of embodiment 1 installed in a terminal;

fig. 4 is a S11 parameter diagram of the antenna of example 2 mounted in a radome;

FIG. 5 is a power spectrum envelope diagram of a receiving end probe in a darkroom experiment using the antenna of example 2 as a transmitting antenna;

fig. 6 is a vertical pattern of the antenna and the glue-coated copper tube antenna of example 2.

The present invention will be described in further detail with reference to the drawings and examples.

Detailed Description

The utility model will be described in detail below with reference to the accompanying drawings, wherein for the purpose of illustrating embodiments of the utility model, the drawings showing the structure of the device are not to scale but are partly enlarged, and the schematic drawings are only examples, and should not be construed as limiting the scope of the utility model. It is to be noted, however, that the drawings are designed in a simplified form and are not to scale, but rather are to be construed in an attempt to more clearly and concisely illustrate embodiments of the present invention. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; the terms "front," "back," "bottom," "upper," "lower," and the like refer to an orientation or positional relationship relative to an orientation or positional relationship shown in the drawings, which is for convenience and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

Example 1

As shown in fig. 1, the microstrip line PCB antenna of the present embodiment includes a dielectric substrate 1, a radiation patch 2, a ground patch 3, a radiation patch feed pad 4, and a ground patch feed pad 5, the radiation patch 2 and the ground patch 3 being disposed on the same side surface of the dielectric substrate 1. The radiation piece 2 is provided with a radiation piece feed bonding pad 4, the ground piece 3 is provided with a ground piece feed bonding pad 5, the two bonding pads are respectively connected with an inner core and an outer shielding grounding grid of the radio frequency cable, and the radio frequency cable is connected with a radio frequency connector or an SMA joint on the radio frequency module. The dielectric substrate 1 of this embodiment is made of FR4 board and has a thickness of 1mm, and the radiation plate 2 and the ground plate 3 are both made of copper and have a thickness of 1 ounce.

The radiating patch 2 of this embodiment includes a first antenna arm 2-1 and a second antenna arm 2-2 that are parallel to each other, the first antenna arm 2-1 and the second antenna arm 2-2 are connected through a first connecting portion 2-3, the first connecting portion 2-3 is perpendicular to the first antenna arm 2-1 and the second antenna arm 2-2, one end of the first connecting portion 2-3 is connected to one end of the first antenna arm 2-1, and the other end is connected to one end of the second antenna arm 2-2. The first antenna arm 2-1 and the second antenna arm 2-1 are located on the same side of the first connection portion 2-3, that is, the first antenna arm 2-1 and the second antenna arm 2-3 extend in the same direction and horizontally extend from the end portion connected to the first connection portion 2-3, and the length of the first antenna arm 2-1 is smaller than that of the second antenna arm 2-2. In this embodiment, the length of the first antenna arm 2-1 is 45.05mm, the length of the second antenna arm 2-2 is 76mm, the length of the first connection portion 2-3 is 1.6mm, and the widths of the first antenna arm 2-1, the second connection portion 2-2, and the first connection portion 2-3 are all 1.5 mm. The first antenna arm 2-1, the first connecting part 2-3 and the second antenna arm 2-2 are connected in sequence to form a semi-closed fold line shape. A radiating-patch feed pad 4 is provided at the junction of the first connection 2-3 and the second antenna arm 2-2.

The ground plate 3 comprises a square base 3-1, a third antenna arm 3-2 and a fourth antenna arm 3-3, the third antenna arm 3-2 and the fourth antenna arm 3-3 being parallel to each other, and the fourth antenna 3-3 extending beyond the third antenna arm 3-2. The square base 3-1 is rectangular, the third antenna arm 3-2 is connected with the square base 3-1 through a second connecting portion 3-4, the second connecting portion 3-4 is vertically connected to the top of the square base 3-1, the second connecting portion 3-4 is flush with the side of the square base 3-1, and one end of the third antenna arm 3-2 is connected with the second connecting portion 3-4. The fourth antenna arm 3-3 is attached to the bottom of the square base 3-1, and the bottom edge of the fourth antenna arm 3-3 is flush with the bottom edge of the square base 3-1. The ground plate feed pad 5 is provided on the square base 3-1. A gap a is formed in the upper portion of the square base portion 3-1, the gap a extends inwards from the outer edge of the square base portion 3-1, and the gap a is parallel to the third antenna arm 3-2. In this embodiment, the third antenna arm 3-2 has a length of 79.55mm and a width of 1.5mm, the fourth antenna arm 3-3 has a length of 64.05mm and a width of 1mm, and the square base 3-1 has a length and a width of: 20X 6.2mm, the length of the gap a is 0.2mm, and the distance between the gap a and the top edge of the square base 3-1 is 1.5 mm.

The radiating patch 2 is arranged between a third antenna arm 3-2 and a fourth antenna arm 3-3 of the ground patch 3, the first antenna arm 2-1, the second antenna arm 2-2, the third antenna arm 3-2 and the fourth antenna arm 3-3 are parallel to each other, and the second antenna arm 2-2 extends beyond the third antenna arm 3-2 and the fourth antenna arm 3-3. The antenna provided by the utility model mainly adjusts the S11 parameter of the antenna by adjusting the length of the first antenna arm 2-1, so that the antenna meets the performance requirement in the range of 902-928 MHz, and the length of the first antenna arm in the embodiment 1 is taken as a standard, and can be increased or shortened by 0.5-3 mm, namely the length of the first antenna arm 2-1 can be 42-48 mm (the value includes the endpoint value). While adjusting the length of the first antenna arm 2-1, the lengths of the second antenna arm 2-2 and/or the third antenna arm 3-2 and/or the fourth antenna arm 3-3 may be adjusted in a coordinated manner, and the variation ranges of the second, third and fourth antenna arms are wider and more flexible than the variation range of the first antenna arm.

Example 2

As shown in fig. 2, the present embodiment is different from embodiment 1 in that the radiation plate 2 of the present embodiment further includes a fifth antenna arm 2-3 connected to the second antenna arm 2-2, the fifth antenna arm 2-3 is connected to the second antenna arm 2-2 through a third connection portion 2-4, the third connection portion 2-4 is perpendicular to the second antenna arm 2-2, the fifth antenna arm 2-3 is parallel to the second antenna arm 2-2 and extends from an end connected to the third connection portion 2-4 to the third antenna arm 3-2, and the fifth antenna arm 2-3 and the third antenna arm 3-2 are on the same straight line, but are not connected to each other but have a certain interval. Similarly, the antenna of embodiment 2 may also adjust the S11 parameter of the antenna by adjusting the lengths of the first antenna arm, the second antenna arm, the third antenna arm, and the fourth antenna arm, so as to adjust the frequency of the antenna and simultaneously make the S11 parameter of the antenna fall within a desired range to meet different requirements. In addition, in the antenna of embodiment 2, the fifth antenna arm 2-3 is further provided, so that the second antenna arm 2-2 has a bent portion, and this bent portion is actually used to adjust the length of the second antenna arm 2-2, when there is a requirement on the overall length dimension of the antenna, that is, the linear length of the second antenna arm 2-2 cannot be too long, the length of the second antenna arm 2-2 is extended by the fifth antenna arm 2-3 (bent portion) connected to the second antenna arm 2-2, and the purpose that the antenna has a suitable S11 parameter in the range of 902-928M is achieved.

In order to verify the performance of the antenna of the utility model, the S11 parameters of the antennas of example 1 and example 2 were tested under different conditions, and the test conditions of the antenna of example 1 were as follows: the WIFI terminal is installed in a plastic shell of a WIFI terminal (the terminal is AH-bridge-900M of Zhuhaitai core company); example 2 the test case of the antenna was: is mounted in the radome. The measured S11 parameter graphs are respectively shown in fig. 3 and 4, and it can be seen from fig. 3 and 4 that under different application scenarios, the S11 parameters of the antenna of the utility model do not deviate and all fall within the 902-928 MHz frequency band, the S11 adaptability of the antenna is good, and the antenna can be applied to corresponding application scenarios according to requirements.

Meanwhile, outdoor pull distance experiments of the WIFI network bridge terminal are also performed on the antenna of the embodiment 2 and the glue-rod copper-tube antenna purchased in the market (the glue-rod copper-tube antenna is a high-gain antenna of chengzhia science and technology limited company), two terminal machines used in the experiments are AH-network bridge-900M terminal machines of zhahitai core company, one terminal machine (sta) uses the glue-rod copper-tube antenna, the other terminal machine (ap) is respectively connected with the antenna and the glue-rod copper-tube antenna of the embodiment 2, and the pull distance performance test results of the two antenna are respectively shown in table 1 and table 2.

TABLE 1

TABLE 2

As can be seen from the test results in tables 1 and 2, the maximum pull distance (413m) of the antenna of embodiment 2 is greater than that of the plastic-rod copper-tube antenna, rssi is superior to that of the plastic-rod copper-tube antenna, and the antenna performance of embodiment 2 is not inferior to that of the plastic-rod copper-tube antenna, even better, but the volume is much smaller than that of the plastic-rod copper-tube antenna, and the antenna can be applied to a scene requiring miniaturization of the antenna volume, such as being placed inside a terminal machine.

The antenna of embodiment 1 is attached to the inside of a screen terminal of a doorbell product (a doorbell product used in a test of a doorbell product of jiasong electronics technologies ltd, guan), an outdoor pull-distance experiment is performed on a road, and the antenna of the camera terminal is an FPC antenna. The test results are shown in table 3. In addition, the antenna of the embodiment 1 is attached to the inside of a screen terminal of a Jiasong doorbell machine product, a variable test is carried out on a beach, and the farthest pulling distance on the beach can reach 467 meters.

TABLE 3

As can be seen from the test results in table 3, the antenna of example 1 can also meet the application requirements as the built-in antenna of the product terminal.

The antenna of example 2 was used as a transmitting antenna for a darkroom experiment, the transmitting antenna was mounted on a rotating disk in a transmitting end darkroom, the size of the transmitting end darkroom was: length, width, and height: 71, 80 and 72(CM), and pyramidal wave-absorbing materials are adhered to the inner wall of the dark chamber. The structure of the receiving end darkroom is the same as that of the transmitting end darkroom, and a high-directivity probe (the high-directivity probe is a log-periodic antenna of the Cistances electronic technology, and the frequency is 806-960 MHz) is installed in the receiving end darkroom. During testing, the rotating disc is controlled to rotate at a constant speed (0-360 degrees) on a horizontal plane at a rotating speed of 12 seconds/circle, and the transmitting antenna transmits 8MHz broadband constant flat envelope spectrum; the high-directivity probe in the dark room of the receiving end which is 15 meters away receives signals and guides the signals into the frequency spectrograph, and the real-time received power spectrum period fluctuation is observed under the rotating state of the transmitting antenna, the power spectrum envelope detected by the high-directivity probe is as shown in figure 5, and as can be seen from figure 5, the maximum value of the power envelope reaches-55 dBm, namely the maximum power measured instantly can reach-55 dBm on average.

The same darkroom experiment was performed using the rubber-insulated copper tube antenna as the transmitting antenna, and the average of the two intermediate frequency points of the power spectrum envelope of 8MHz bandwidth was read, and the obtained test results are shown in table 4. The vertical pattern plotted according to the results of table 4 is shown in fig. 6 (the dots in fig. 6 are data of the antenna of example 2, and the squares are data of the brass-plastic-tube antenna).

TABLE 4

As can be seen from table 4 and fig. 6, the rssi value of the antenna of example 2 around the maximum power (i.e. maximum gain) is equivalent to or even better than that of the copper plastic-filled tube antenna.

According to the test results, the antenna is small in size, the bandwidth can cover the 902-928 MHz frequency band, the size requirements of different products can be met, the S11 adopted number is not deviated from the frequency point, and the antenna can be applied to different scenes such as the inside of an antenna cover, the inside of a product shell and the exposure in the air.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. A microstrip PCB antenna comprising: the antenna comprises a dielectric substrate, a radiation piece and a grounding piece, wherein the radiation piece and the grounding piece are arranged on the dielectric substrate; the method is characterized in that:

the radiation sheet and the grounding sheet are arranged on the same side surface of the medium substrate;

the radiating piece comprises a first antenna arm and a second antenna arm which are parallel to each other, the first antenna arm and the second antenna arm are connected through a first connecting part, the first connecting part is perpendicular to the first antenna arm and the second antenna arm, and the first antenna arm and the second antenna arm are located on the same side of the first connecting part;

the grounding plate comprises a square base, a third antenna arm and a fourth antenna arm, wherein the third antenna arm and the fourth antenna arm are connected with the square base, the third antenna arm and the fourth antenna arm are parallel to each other, the third antenna arm and the fourth antenna arm extend to the same direction, the third antenna arm is connected with the top of the square base through a second connecting part perpendicular to the third antenna arm, the second connecting part is flush with the side edge of the square base, the fourth antenna arm is connected with the bottom of the square base, and the bottom edge of the fourth antenna arm is flush with the bottom edge of the square base;

the radiating plate is arranged between the third antenna arm and the fourth antenna arm, the first connecting portion and the square base portion are arranged adjacently, and the first antenna arm, the second antenna arm, the third antenna arm and the fourth antenna arm are parallel to each other.

2. The microstrip PCB antenna of claim 1, wherein: the radiating plate feeding pad is arranged at the joint of the first connecting part and the second antenna arm.

3. The microstrip PCB antenna of claim 1, wherein: the ground plate feed pad is disposed on the square base.

4. The microstrip PCB antenna of claim 1, wherein: a slot is formed in the upper portion of the square base, the slot extends inwards from the outer edge of the square base, and the slot is parallel to the third antenna arm.

5. The microstrip PCB antenna of claim 1, wherein: the length of the first antenna arm is 42 mm-48 mm.

6. The microstrip PCB antenna of claim 1 or 5, wherein: the length of the first antenna arm is less than the length of the second antenna arm, the second antenna arm extends beyond the third antenna arm and the fourth antenna arm, and the fourth antenna arm extends beyond the third antenna arm.

7. The microstrip PCB antenna of claim 1, wherein: the length of first antenna arm is 45.05mm, the length of second antenna arm is 76mm, the length of first connecting portion is 1.6mm, the width of first antenna arm, second connecting portion and first connecting portion is 1.5mm, the length of third antenna arm is 79.55mm, the width is 1.5mm, the length of fourth antenna arm is 64.05mm, the width is 1mm, the length of square base, wide are 20 x 6.2 mm.

8. The microstrip PCB antenna of claim 7, wherein: the upper portion of the square base portion is provided with a gap extending inwards from the outer edge of the square base portion, the gap is parallel to the third antenna arm, the length of the gap is 0.2mm, and the distance between the gap and the top edge of the square base portion is 1.5 mm.

9. The microstrip PCB antenna of claim 1, wherein: the radiating patch further comprises a fifth antenna arm connected with the second antenna arm, the fifth antenna arm is parallel to the second antenna arm, the fifth antenna arm is connected with the end part of the second antenna arm through a third connecting part, the third connecting part is perpendicular to the second antenna arm, and the fifth antenna arm extends from one end, connected with the third connecting part, of the fifth antenna arm to the third antenna arm and is located on the same straight line with the third antenna arm.

10. The microstrip PCB antenna of claim 1, wherein: the frequency band of the microstrip PCB antenna is 902-928 MHz.