Multi-frequency printed antenna

Abstract

A multi-frequency printed antenna includes: a circuit board having a first surface and a second surface opposite to each other; the feed-in end is arranged on the left side part of the first surface; the radiation part is arranged on the first surface, extends rightwards from the feed-in end and then respectively extends upwards and downwards to form two branches; the grounding end is arranged on the first surface and is positioned on the left side of the feed-in end; the first grounding part extends leftwards, upwards and downwards from the grounding end to the edge of the circuit carrier plate and then extends rightwards, and is not in contact with the radiation part; the second grounding part is arranged on the second surface and is symmetrical to the first grounding part; and a plurality of through holes which penetrate through the first surface and the second surface, are electrically connected with the first grounding part and the second grounding part, and are arranged along the edge.

Description

Technical Field

[0001] The utility model relates to an antenna, in particular to a small-sized printed antenna with multiple frequency bands. Background Art

[0002] As 5G communication technology becomes more and more popular, the FR1 and FR2 frequency bands of 5G communication have also begun to be adopted. Since some frequency bands of 5G communication overlap with the original frequency bands of 4G communication, the demand for multi-band antennas used in mobile communication products is increasing.

[0003] In order to achieve portability of electronic devices, the appearance size of electronic devices on the market is currently designed to be miniaturized, which limits the space that can be occupied by the antenna externally connected to the host shell and the antenna contained in the device shell. The antenna must be able to provide multiple operating frequency bands while fitting into a smaller space. However, the miniaturization of the size makes it difficult for the antenna itself to provide multiple frequency bands.

[0004] Therefore, it is necessary to provide a multi-frequency printed antenna with increased frequency bands under limited space. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-frequency printed antenna, comprising: a circuit carrier having a first surface and a second surface opposite to each other; a feed end, the feed end being arranged at the left side of the first surface; a radiating portion, arranged on the first surface, and extending straightly to the right from the feed end and then extending two branches upward and downward respectively; a grounding end, the grounding end being arranged on the first surface and located on the left side of the feed end; a first grounding portion, the first grounding portion extending leftward, upward and downward from the grounding end to the edge of the circuit carrier, and extending rightward to form two upward and downward branch grounding portions, the branch grounding portions surrounding but not contacting the radiating portion; a second grounding portion, the second grounding portion being arranged on the second surface and symmetrically shaped with the first grounding portion, the extension areas of the first grounding portion and the second grounding portion being substantially equal; and a plurality of through holes penetrating the first surface and the second surface of the circuit carrier, the through holes electrically connecting the first grounding portion and the second grounding portion, and being arranged along the edge of the circuit carrier.

[0006] In some embodiments, the radiating portion includes a first radiating segment extending linearly to the right from the feeding end, a second radiating segment extending linearly upward from the middle of the top edge of the first radiating segment, a third radiating segment extending linearly to the right along the edge of the circuit carrier from the top of the right side edge of the second radiating segment, and a fourth radiating segment extending linearly downward from the right end of the bottom edge of the first radiating segment, wherein the feeding end is separated from the grounding end by a first spacing, the first radiating segment is arranged in a space surrounded by the branch grounding portion, the top edge of the second radiating segment is flush with the upper edge of the circuit carrier, the third radiating segment extends to the right to the right side edge of the circuit carrier, then extends downward along the right side edge of the circuit carrier to the lower edge, and then bends and extends to the left, so that the extension path of the third radiating segment is roughly in the shape of an inverted 7, and the bottom edge of the fourth radiating segment keeps a distance from the lower edge of the circuit carrier.

[0007] In some embodiments, the first grounding portion includes a first grounding segment extending upward and downward from the grounding end to the upper edge and the lower edge of the circuit carrier, a second grounding segment extending linearly to the left from the left edge of the first grounding segment, a third grounding segment extending linearly to the right from the top of the right edge of the first grounding segment, and a fourth grounding segment extending linearly to the right from the bottom of the right edge of the first grounding segment, the left edge of the second grounding segment is aligned with the left edge of the circuit carrier, the bottom edge of the third grounding segment is spaced from the top edge of the first radiating segment by a second spacing, the top edge of the fourth grounding segment is spaced from the bottom edge of the first radiating segment by a third spacing, the left edge of the second radiating segment is spaced from the right edge of the third grounding segment by a fourth spacing, and the left edge of the fourth radiating segment is spaced from the right edge of the fourth grounding segment by a fifth spacing.

[0008] In some embodiments, the third radiating segment includes a first radiating strip extending straight to the right from the top of the right side edge of the second radiating segment, a second radiating strip extending from the right end of the first radiating strip to the lower right and a third radiating strip extending from the bottom end of the second radiating strip to the left, the top edge of the first radiating strip is aligned with the upper edge of the circuit carrier, the right edge of the second radiating strip is aligned with the right edge of the circuit carrier, the bottom edge of the third radiating strip is aligned with the lower edge of the circuit carrier, and the left edge of the third radiating strip is kept at a distance from the right edge of the fourth radiating segment.

[0009] Another object of the present invention is to provide a multi-frequency printed antenna, comprising: a circuit carrier having a first surface; a metal layer disposed on the first surface of the circuit carrier, the metal layer being provided with a top edge and a bottom edge opposite to each other and a left edge and a right edge opposite to each other; wherein the metal layer is provided with a slot extending from the top edge to the bottom edge and penetrating the metal layer, the slot dividing the metal layer into a radiation portion located on the right side of the slot and a first grounding portion located on the left side of the slot; wherein the slot is provided with a bottom opening opened at the bottom edge, the bottom opening extending toward the top edge to form a first slot section, the top end of the first slot section extending toward the left edge to form a second slot section, The left end of the second slot segment extends toward the top edge to form a third slot segment, the top of the third slot segment extends toward the right side edge to form a fourth slot segment, the right end of the fourth slot segment extends toward the top edge to form a fifth slot segment, and the top of the fifth slot segment penetrates the top edge to form a top opening; wherein, the radiating portion is recessed from the bottom edge toward the top edge to form a first hollowed-out area, the upper left corner of the first hollowed-out area further extends toward the left side edge to form a second hollowed-out area, the right side of the first hollowed-out area further extends toward the right side edge to form a third hollowed-out area, and the second hollowed-out area is located above the second slot segment; wherein, a grounding end located at the grounding portion and a feeding end located at the radiating portion are respectively provided on the left and right sides of the third slot segment.

[0010] In some embodiments, the left side of the second hollowed-out area corresponds to the right side of the fifth slot segment, and the lower side of the second hollowed-out area corresponds to the upper side of the second slot segment.

[0011] In some embodiments, the circuit carrier is provided with a second surface relative to the first surface, the second surface is provided with a second grounding portion, the shape of the first grounding portion is the same as the shape of the second grounding portion, the circuit carrier is provided with a plurality of through holes passing through the first surface and the second surface, the through holes are arranged along the edges of the first grounding portion and the second grounding portion, and the position of the first grounding portion corresponds to the position of the second grounding portion.

[0012] Another object of the present invention is to provide a multi-frequency printed antenna, comprising: a circuit carrier having a first surface; a first grounding section, arranged on the first surface of the circuit carrier; a second grounding section, extending from the left edge of the first grounding section to the left; a third grounding section, extending from the top of the right edge of the first grounding section to the right; a fourth grounding section, extending from the bottom of the right edge of the first grounding section to the right; a grounding end, arranged in the middle of the right edge of the first grounding section; a first radiating section, arranged between the first grounding section, the third grounding section and the fourth grounding section; a second radiating section, extending upward from the middle of the top edge of the first radiating section; a third radiating section, extending from the top of the right edge of the second radiating section to the right, then bending downward and extending, and then bending leftward and extending; a fourth radiating section, extending downward from the right side of the bottom edge of the first radiating section; a feeding end, arranged at the left edge of the first radiating section and opposite to the grounding end on the left and right.

[0013] In some embodiments, the left edge of the first radiating segment corresponds to the middle of the right edge of the first grounding segment, the bottom edge of the first radiating segment corresponds to the top edge of the fourth grounding segment, the top edge of the first radiating segment corresponds to the bottom edge of the third grounding segment, the left edge of the second radiating segment corresponds to the right edge of the third grounding segment, and the left edge of the fourth radiating segment corresponds to the right edge of the fourth grounding segment.

[0014] In some embodiments, the circuit carrier is provided with a second surface relative to the first surface, the first grounding segment, the second grounding segment, the third grounding segment and the fourth grounding segment constitute a first grounding portion, the second surface is provided with a second grounding portion, the shape of the first grounding portion is the same as the shape of the second grounding portion, the circuit carrier is provided with a plurality of through holes passing through the first surface and the second surface, the through holes are arranged along the edges of the first grounding portion and the second grounding portion, and the position of the first grounding portion corresponds to the position of the second grounding portion.

[0015] As described above, the multi-frequency printed antenna of the utility model can stably provide multiple operating frequency bands in a limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the above and other purposes, features, advantages and embodiments of the present invention more obvious and understandable, the content of the present invention can be better understood when reading in conjunction with the accompanying drawings.

[0017] Figure 1 It is a structural diagram of the front side of the multi-frequency printed antenna according to the first embodiment of the utility model.

[0018] Figure 2It is a structural diagram of the back side of the multi-frequency printed antenna according to the first embodiment of the utility model.

[0019] Figure 3 It is a structural diagram of the front side of the multi-frequency printed antenna according to the second embodiment of the utility model.

[0020] Figure 4 This is a voltage standing wave ratio test diagram of the multi-frequency printed antenna of the utility model.

[0021] Figure 5 This is an efficiency diagram of the multi-frequency printed antenna of the utility model. DETAILED DESCRIPTION

[0022] In order to explain in detail the technical content, structural features, objectives and effects of the multi-frequency printed antenna of the utility model, the following examples are given and detailed descriptions are provided with the help of drawings. For the convenience of description, the upper part referred to in this specification is defined as a higher position in the direction facing the drawings, the lower part is defined as a lower position in the direction facing the drawings, the left part is defined as a position on the left hand side in the direction facing the drawings, and the right part is defined as a position on the right hand side in the direction facing the drawings.

[0023] See also Figure 1 and Figure 2 ,like Figure 1 and Figure 2 The first embodiment of the utility model is shown. The multi-frequency printed antenna 100 of the utility model is a monopole antenna, which is disposed on a circuit board 10 of an electronic device (not shown in the figure). The multi-frequency printed antenna 100 is composed of a radiating portion 20, a first grounding portion 30, a second grounding portion 40 and a plurality of through holes 50. The radiating portion 20, the first grounding portion 30 and the second grounding portion 40 are all disposed on the circuit board 10. In this embodiment, the circuit board 10 has a first surface 11 and a second surface 12 opposite to each other. Please refer to Figure 1 , the radiation portion 20 and the first grounding portion 30 are both disposed on the first surface 11 of the circuit carrier 10, and the second grounding portion 40 is disposed on the second surface 12 of the circuit carrier 10, wherein the first grounding portion 30 is disposed on the left portion of the first surface 11, and the second grounding portion 40 is disposed on the right portion of the second surface 12 of the circuit carrier 10. The through hole 50 penetrates the first surface 11 and the second surface 12 of the circuit carrier 10, and electrically connects the first grounding portion 30 and the second grounding portion 40. In this embodiment, the through hole 50 is disposed along the edge of the circuit carrier 10.

[0024] Please see again Figure 1 and Figure 2The first grounding portion 30 is provided with a grounding end 35, and the first grounding portion 30 extends from the grounding end 35 to the left, upward and downward to the edge of the circuit carrier 10, and extends to the right to form two upward and downward branch grounding portions, and the branch grounding portions surround but do not contact the radiating portion 20. In this embodiment, the first grounding portion 30 includes a first grounding section 31, a second grounding section 32, a third grounding section 33 and a fourth grounding section 34.

[0025] The first grounding section 31 is substantially rectangular and is disposed at the left side of the circuit carrier 10. The grounding end 35 is disposed at the middle of the right side edge of the first grounding section 31. The first grounding section 31 is formed by the grounding end 35 extending upward and downward to the top edge and the bottom edge of the circuit carrier 10, respectively. The second grounding section 32 is formed by the middle of the left side edge of the first grounding section 31 extending straight to the left, and the left side edge of the second grounding section 32 is aligned with the left side edge of the circuit carrier 10. The third grounding section 33 is formed by the top of the right side edge of the first grounding section 31 extending straight to the right to the middle part of the circuit carrier 10, and the top edge of the third grounding section 33 is aligned with the upper side edge of the circuit carrier 10.

[0026] The fourth grounding section 34 is formed by extending the bottom of the left edge of the first grounding section 31 to the right straight line to the middle part of the circuit carrier 10. The bottom edge of the fourth grounding section 34 is aligned with the lower edge of the circuit carrier 10. The extension length of the fourth grounding section 34 is greater than the extension length of the third grounding section 33. The first grounding section 31, the third grounding section 33 and the fourth grounding section 34 enclose a space 36, and the space 36 accommodates the radiation portion 20. The second grounding portion 40 is symmetrically shaped with the first grounding portion 30 and is disposed on the second surface 12. The extension area of ​​the second grounding portion 40 is substantially equal to the extension area of ​​the first grounding portion 30.

[0027] Continue reading Figure 1 The radiating portion 20 extends to the left, middle and right portions of the first surface 11 of the circuit carrier 10, and is provided with a feeding end 25 located at the left portion of the first surface 11. The extension path of the radiating portion 20 extends straight rightward from the feeding end 25 and then extends two branches upward and downward respectively, and includes a first radiating section 21, a second radiating section 22, a third radiating section 23 and a fourth radiating section 24.

[0028] The first radiating section 21 is formed by the feeding end 25 extending straight to the right, and the extension path of the first radiating section 21 is in the shape of a horizontal long strip. The first radiating section 21 is arranged in the space 36, and the feeding end 25 is arranged at the left edge of the first radiating section 21. The feeding end 25 is located on the right side of the grounding end 35. The grounding end 35 and the feeding end 25 are separated by a first spacing s1. The left edge of the first radiating section 21 and the middle of the right edge of the first grounding section 31 are separated by the first spacing s1. The bottom edge of the third grounding section 33 and the top edge of the first radiating section 21 are separated by a second spacing s2. The top edge of the fourth grounding section 34 and the bottom edge of the first radiating section 21 are separated by a third spacing s3.

[0029] The second radiating section 22 is formed by extending straightly upward from the middle of the upper side edge of the first radiating section 21, and the top edge of the second radiating section 22 is aligned with the upper side edge of the circuit carrier 10, and the right side edge of the third grounding section 33 is separated from the left side edge of the second radiating section 22 by a fourth spacing s4. The third radiating section 23 extends rightward from the top of the right side edge of the second radiating section 22 to the right side edge of the circuit carrier 10, then extends downward along the right side edge of the circuit carrier 10 to the lower side edge, and then bends leftward, so that the extension path of the third radiating section 23 is roughly in the shape of an inverted 7.

[0030] In this embodiment, the third radiation section 23 includes a first radiation strip 23a, a second radiation strip 23b and a third radiation strip 23c. The first radiation strip 23a is formed by the top of the right edge of the second radiation section 22 extending straight to the right, and the top edge of the first radiation strip 23a is aligned with the upper edge of the circuit carrier 10. The second radiation strip 23b is formed by the right end of the first radiation strip 23a bending and extending downward to the right, and the right edge of the second radiation strip 23b is aligned with the right edge of the circuit carrier 10. The third radiation strip 23c is formed by the bottom end of the second radiation strip 23b bending and extending to the left, and the bottom edge of the third radiation strip 23c is aligned with the lower edge of the circuit carrier 10.

[0031] The fourth radiation section 24 is formed by a straight downward extension of the right side of the bottom edge of the first radiation section 21, and the bottom edge of the fourth radiation section 24 maintains a distance from the lower edge of the circuit carrier 10, the left edge of the third radiation strip 23c maintains a distance from the right edge of the fourth radiation section 24, and the right edge of the fourth grounding section 34 is separated from the left edge of the fourth radiation section 24 by a fifth spacing s5.

[0032] When the multi-frequency printed antenna 100 of the present invention is used for wireless communication, current is fed into the feeding end 25, and the current flows through the first radiation section 21 and the second radiation section 22, and then passes through the third radiation section 23 to oscillate a frequency band of 600MHZ to 960MHZ. Meanwhile, the current passes through the fourth radiation section 24 to oscillate a frequency band of 3300MHZ to 3800MHZ.

[0033] In this embodiment, the first spacing s1 to the fifth spacing s5 have certain size requirements, so that the first spacing s1 to the fifth spacing s5 have a coupling effect, and can oscillate the frequency bands of 1710MHZ to 2700MHZ and 4700MHZ to 6000MHZ through the electromagnetic waves of the radiation part 20, the first grounding part 30 and the second grounding part 40. The first radiation section 21 is coupled with the first grounding part 30 and the second grounding part 40, so that the frequency band oscillated is 1710MHZ to 2700MHZ. The fourth radiation section 24 is coupled with the first grounding part 30 and the second grounding part 40, so that the frequency band oscillated is 4700MHZ to 6000MHZ. The multi-frequency printed antenna 100 of the utility model increases the frequency band that can be provided in a limited space.

[0034] In practice, the first spacing s1 is 1.4 mm, the second spacing s2 is 0.5 mm, the third spacing s3 is 0.8 mm, the fourth spacing s4 is 0.85 mm, and the fifth spacing s5 is 0.8 mm.

[0035] See also Figure 3 In the second embodiment of the utility model, the first surface 11 of the circuit carrier 10 is provided with a metal layer 60, the metal layer 60 is provided with a top edge and a bottom edge opposite to each other and a left edge and a right edge opposite to each other, and the metal layer 60 is provided with a slot 70. The slot 70 extends from the top edge of the metal layer 60 to the bottom edge of the metal layer 60 and penetrates the metal layer 60, and divides the metal layer 60 into the radiation portion 20 and the first grounding portion 30, the radiation portion 20 is located on the right side of the slot 70, and the first grounding portion 30 is located on the left side of the slot 70. The second surface 12 of the circuit carrier 10 is provided with the second grounding portion 40, the shape of the second grounding portion 40 is the same as that of the first grounding portion 30, and the position of the second grounding portion 40 corresponds to the position of the first grounding portion 30, and the through hole 50 is provided along the edges of the first grounding portion 30 and the second grounding portion 40.

[0036] In this embodiment, the slot 70 is provided with a bottom opening 71 opened at the bottom edge of the metal layer 60, the bottom opening 71 extends toward the top edge of the metal layer 60 to form a first slot section 70a, the top of the first slot section 70a extends toward the left side edge of the metal layer 60 to form a second slot section 70b, the left end of the second slot section 70b extends toward the top edge of the metal layer 60 to form a third slot section 70c, the left and right sides of the third slot section 70c are respectively provided with the grounding end 35 located at the first grounding portion 30 and the feeding end 25 located at the radiation portion 20, and the top of the third slot section 70c extends toward the right side edge of the metal layer 60 to form a fourth slot section 70d, the right end of the fourth slot section 70d extends toward the top edge of the metal layer 60 to form a fifth slot section 70e, and the top of the fifth slot section 70e passes through the top edge of the metal layer 60 to form a top opening 72.

[0037] Continue reading Figure 3 The radiation portion 20 is recessed from the bottom edge of the metal layer 60 toward the top edge of the metal layer 60 to form a first hollowing area 61, and the first hollowing area 61 further extends to form a second hollowing area 62 and a third hollowing area 63. The second hollowing area 62 is formed by extending from the upper left corner of the first hollowing area 61 toward the left edge of the metal layer 60, and the second hollowing area 62 is located above the second slot segment 70b, the lower side of the second hollowing area 62 corresponds to the upper side of the second slot segment 70b, and the left side of the second hollowing area 62 corresponds to the right side of the fifth slot segment 70e. The third hollowing area 63 is formed by extending from the right side of the first hollowing area 61 toward the right edge of the metal layer 60.

[0038] See also Figure 4, which is a voltage standing wave ratio (VSWR) test diagram of the multi-frequency printed antenna 100 of the utility model. When the multi-frequency printed antenna 100 of the utility model operates at 700MHz, the voltage standing wave ratio is 3.9669 (M1 in the figure), when the multi-frequency printed antenna 100 of the utility model operates at 960MHz, the voltage standing wave ratio is 5.2972 (M2 in the figure), when the multi-frequency printed antenna 100 of the utility model operates at 1710MHz, the voltage standing wave ratio is 2.6375 (M3 in the figure), when the multi-frequency printed antenna 100 of the utility model operates at 2700MHz, the voltage standing wave ratio is 1.9964 (M4 in the figure), When the multi-frequency printed antenna 100 of the present invention operates at 3600MHz, the voltage standing wave ratio is 2.7268 (M5 in the figure), when the multi-frequency printed antenna 100 of the present invention operates at 3800MHz, the voltage standing wave ratio is 2.5085 (M6 in the figure), when the multi-frequency printed antenna 100 of the present invention operates at 4200MHz, the voltage standing wave ratio is 2.0769 (M7 in the figure), and when the multi-frequency printed antenna 100 of the present invention operates at 6000MHz, the voltage standing wave ratio is 1.918 (M8 in the figure). Therefore, the multi-frequency printed antenna 100 of the present invention can stably operate in the frequency bands of 600MHz to 960MHz, 1710MHz to 2700MHz, 3300MHz to 3800MHz, and 4700MHz to 6000MHz. According to the above voltage standing wave ratio, it can be calculated that the reflection loss of the bandwidth of the multi-frequency printed antenna 100 of the present invention operating in the frequency bands of 600MHz to 960MHz, 1710MHz to 2700MHz, 3300MHz to 3800MHz and 4700MHz to 6000MHz is roughly within -20dB, indicating that the loss degree of the multi-frequency printed antenna 100 of the present invention is small and the radiation energy of the multi-frequency printed antenna 100 is large.

[0039] See also Figure 5 , is an efficiency diagram of the multi-frequency printed antenna 100 of the utility model. When the antenna works at different frequencies, the higher the efficiency value converted from the average power, the better the performance of the antenna. In this embodiment, the efficiency of the multi-frequency printed antenna 100 in the working frequency bands of 600MHz to 960MHz, 1710MHz to 2700MHz, 3300MHz to 3800MHz and 4700MHz to 6000MHz is approximately 70%. Therefore, the multi-frequency printed antenna 100 of the utility model can achieve high efficiency in the working frequency band in a limited space and its performance is maintained at a certain level.

[0040] In summary, the multi-frequency printed antenna 100 of the present invention can increase the frequency bands provided in a limited space, adapting to the development trend of popularization of 5G communication technology and miniaturization of electronic products.

[0041] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the attached claims.

Claims

1. A multi-frequency printed antenna, characterized in that: The invention comprises: a circuit carrier having a first surface and a second surface opposite to each other; a feeding end, the feeding end being arranged at a left side portion of the first surface; A radiating portion, which is arranged on the first surface and extends straightly to the right from the feeding end and then extends two branches upward and downward respectively; a grounding end, which is arranged on the first surface and is located on the left side of the feeding end; a first grounding portion, which extends from the grounding end to the left, upward and downward to the edge of the circuit carrier and extends to the right to form two branch grounding portions upward and downward, the branch grounding portions surround but do not contact the radiating portion; a second grounding portion, which is arranged on the second surface and is symmetrical with the first grounding portion, and the extension areas of the first grounding portion and the second grounding portion are substantially equal; and a plurality of through holes penetrating the first surface and the second surface of the circuit carrier, the through holes electrically connecting the first grounding portion and the second grounding portion, and are arranged along the edge of the circuit carrier.

2. The multi-frequency printed antenna according to claim 1, characterized in that: The radiating portion includes a first radiating section extending linearly to the right from the feeding end, a second radiating section extending linearly upward from the middle of the top edge of the first radiating section, a third radiating section extending linearly to the right along the edge of the circuit carrier from the top of the right side edge of the second radiating section, and a fourth radiating section extending linearly downward from the right end of the bottom edge of the first radiating section, wherein the feeding end is spaced apart from the grounding end by a first spacing, the first radiating section is arranged in a space surrounded by the branch grounding portion, the top edge of the second radiating section is flush with the upper edge of the circuit carrier, the third radiating section extends to the right to the right side edge of the circuit carrier, then extends downward along the right side edge of the circuit carrier to the lower edge, then bends and extends to the left, so that the extension path of the third radiating section is roughly in the shape of an inverted 7, and the bottom edge of the fourth radiating section keeps a distance from the lower edge of the circuit carrier.

3. The multi-frequency printed antenna according to claim 2, characterized in that: The first grounding portion includes a first grounding segment extending upward and downward from the grounding end to the upper edge and the lower edge of the circuit carrier, a second grounding segment extending linearly to the left from the left edge of the first grounding segment, a third grounding segment extending linearly to the right from the top of the right edge of the first grounding segment, and a fourth grounding segment extending linearly to the right from the bottom of the right edge of the first grounding segment, the left edge of the second grounding segment is aligned with the left edge of the circuit carrier, the bottom edge of the third grounding segment is spaced apart from the top edge of the first radiating segment by a second spacing, the top edge of the fourth grounding segment is spaced apart from the bottom edge of the first radiating segment by a third spacing, the left edge of the second radiating segment is spaced apart from the right edge of the third grounding segment by a fourth spacing, and the left edge of the fourth radiating segment is spaced apart from the right edge of the fourth grounding segment by a fifth spacing.

4. The multi-frequency printed antenna according to claim 2, wherein: The third radiating section includes a first radiating strip extending straight to the right from the top of the right side edge of the second radiating section, a second radiating strip extending from the right end of the first radiating strip to the lower right and a third radiating strip extending from the bottom end of the second radiating strip to the left, wherein the top edge of the first radiating strip is aligned with the upper edge of the circuit carrier, the right edge of the second radiating strip is aligned with the right edge of the circuit carrier, the bottom edge of the third radiating strip is aligned with the lower edge of the circuit carrier, and the left edge of the third radiating strip is kept at a distance from the right edge of the fourth radiating section.

5. A multi-frequency printed antenna, characterized in that: The invention comprises: a circuit carrier having a first surface; a metal layer arranged on the first surface of the circuit carrier, the metal layer being provided with a top edge and a bottom edge opposite to each other and a left edge and a right edge opposite to each other; wherein the metal layer is provided with a slot extending from the top edge to the bottom edge and penetrating the metal layer, the slot dividing the metal layer into a radiating portion located on the right side of the slot and a first grounding portion located on the left side of the slot; wherein the slot is provided with a bottom opening opened at the bottom edge, the bottom opening extending toward the top edge to form a first slot section, the top end of the first slot section extending toward the left edge to form a second slot section, the left end of the second slot section extending toward the top edge to form a second slot section The end edge extends to form a third slot section, the top end of the third slot section extends toward the right side edge to form a fourth slot section, the right end of the fourth slot section extends toward the top edge to form a fifth slot section, and the top end of the fifth slot section penetrates the top edge to form a top opening; wherein, the radiating portion is recessed from the bottom end edge toward the top edge to form a first hollowed-out area, the upper left corner of the first hollowed-out area further extends toward the left side edge to form a second hollowed-out area, the right side of the first hollowed-out area further extends toward the right side edge to form a third hollowed-out area, and the second hollowed-out area is located above the second slot section; wherein, a grounding end located at the grounding portion and a feeding end located at the radiating portion are respectively provided on the left and right sides of the third slot section.

6. The multi-frequency printed antenna according to claim 5, characterized in that: The left side of the second hollowed-out area corresponds to the right side of the fifth slot segment, and the lower side of the second hollowed-out area corresponds to the upper side of the second slot segment.

7. The multi-frequency printed antenna according to claim 5, characterized in that: The circuit carrier is provided with a second surface opposite to the first surface, and the second surface is provided with a second grounding portion. The shape of the first grounding portion is the same as the shape of the second grounding portion. The circuit carrier is provided with a plurality of through holes penetrating the first surface and the second surface. The through holes are arranged along the edges of the first grounding portion and the second grounding portion. The position of the first grounding portion corresponds to the position of the second grounding portion.

8. A multi-frequency printed antenna, characterized in that: The invention comprises: a circuit carrier having a first surface; a first grounding section disposed on the first surface of the circuit carrier; a second grounding section extending from the left edge of the first grounding section to the left; a third grounding section extending from the top of the right edge of the first grounding section to the right; a fourth grounding section extending from the bottom of the right edge of the first grounding section to the right; and a grounding end disposed in the middle of the right edge of the first grounding section; a first radiating section, disposed between the first grounding section, the third grounding section and the fourth grounding section; a second radiating section, extending upward from the middle of the top edge of the first radiating section; a third radiating section, extending rightward from the top of the right edge of the second radiating section, then bending downward and extending, and then bending leftward and extending; a fourth radiating section, extending downward from the right side of the bottom edge of the first radiating section; A feeding end is arranged at the left edge of the first radiation section and is opposite to the ground end on the left and right sides.

9. The multi-frequency printed antenna according to claim 8, characterized in that: The left edge of the first radiating segment corresponds to the middle of the right edge of the first grounding segment, the bottom edge of the first radiating segment corresponds to the top edge of the fourth grounding segment, the top edge of the first radiating segment corresponds to the bottom edge of the third grounding segment, the left edge of the second radiating segment corresponds to the right edge of the third grounding segment, and the left edge of the fourth radiating segment corresponds to the right edge of the fourth grounding segment.

10. The multi-frequency printed antenna according to claim 9, characterized in that: The circuit carrier is provided with a second surface opposite to the first surface, the first grounding segment, the second grounding segment, the third grounding segment and the fourth grounding segment constitute a first grounding portion, the second surface is provided with a second grounding portion, the shape of the first grounding portion is the same as the shape of the second grounding portion, the circuit carrier is provided with a plurality of through holes penetrating the first surface and the second surface, the through holes are arranged along the edges of the first grounding portion and the second grounding portion, and the position of the first grounding portion corresponds to the position of the second grounding portion.

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