Circuit board antenna and handheld device with communication function

Abstract

The invention discloses a circuit board antenna and a handheld device with a communication function, the circuit board antenna comprises an antenna body and a radio frequency cable, the antenna body comprises a base material layer, and the base material layer is sequentially provided with a grounding area and an antenna radiation area along the length direction; the grounding area is provided with a grounding metal strip, the antenna radiation area is provided with a signal metal strip, and the grounding metal strip and the signal metal strip are connected through a connecting metal strip; the signal metal strip is provided with a signal feed point welding area, the grounding metal strip is provided with a ground wire feed point welding area, a signal wire at one end of the radio frequency cable is connected with a signal feed point, and a ground wire is connected with a grounding feed point. According to the invention, the signal metal strip is arranged on one side of the base material layer, so that the range of a radiation area of the signal metal strip is reduced, and the shielding of the signal metal strip can be better avoided when the signal metal strip is applied to a handheld device.

Description

Technical Field

[0001] The invention belongs to the field of antennas, and in particular relates to a circuit board antenna and a handheld device with communication function. Background Art

[0002] A circuit board antenna is an antenna made of a circuit board, including PCB antennas, FPC antennas, etc. Circuit board antennas are usually used in devices that require wireless data transmission, such as mobile phones, tablet computers, laptop computers and other communication devices, or smart home appliances, handheld devices and other devices with wireless data transmission functions. Since circuit board antennas can be installed in various complex and compact device spaces as built-in antennas, their excellent applicability has made them a popular choice in the market and are widely used in consumer electronics, automotive electronics, medical equipment, smart homes and other fields. In particular, FPC antennas use a flexible circuit board structure, which is thin, flexible, and bendable, making them more suitable for various complex and compact device spaces. However, the narrow space inside the device can easily reduce the performance of the antenna, and for handheld devices such as handheld devices, the area held by the hand will block the antenna, which has a greater impact on the antenna performance. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a circuit board antenna and a handheld device with communication function.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] A circuit board antenna comprises an antenna body and a radio frequency cable connected to the antenna body, wherein the antenna body comprises a substrate layer, and the substrate layer is provided with a grounding area and an antenna radiation area in sequence along its length direction; the grounding area is provided with a grounding metal strip, and the antenna radiation area is provided with a signal metal strip, and the grounding metal strip and the signal metal strip are connected via a connecting metal strip; a signal feeding point welding area is provided on the signal metal strip, and a ground wire feeding point welding area is provided on the grounding metal strip, and the ground wire feeding point welding area is connected with a grounding copper foil; a signal wire at one end of the radio frequency cable is connected to a signal feeding point, and a ground wire is connected to a ground feeding point, and a connecting terminal is provided at the other end of the radio frequency cable.

[0006] Furthermore, the substrate layer includes a first end and a second end relatively arranged in its length direction, and a third end and a fourth end relatively arranged in its width direction; the grounding area is an area on the substrate layer close to its first end, and the antenna radiation area is an area on the substrate layer close to its second end.

[0007] Furthermore, the signal metal strip is arranged in a serpentine shape within the antenna radiation area.

[0008] Furthermore, the signal metal strip includes a first longitudinal metal strip, a second longitudinal metal strip, a third longitudinal metal strip and a fourth longitudinal metal strip which are arranged in parallel in sequence from a side of the antenna radiation area adjacent to the grounding area to a side adjacent to the second end of the substrate layer, the first end of the first longitudinal metal strip is connected to the first end of the second longitudinal metal strip through a first transverse metal strip, the second end of the second longitudinal metal strip is connected to the second end of the third longitudinal metal strip through a second transverse metal strip, and the first end of the third longitudinal metal strip is connected to the first end of the fourth longitudinal metal strip through a third transverse metal strip; the middle part of the first longitudinal metal strip is connected to the connecting metal strip, and the signal feeding point welding area is arranged on the side of the connecting area between the first longitudinal metal strip and the connecting metal strip toward the second end of the first longitudinal metal strip.

[0009] Furthermore, the second end of the fourth longitudinal metal strip is connected to a fourth transverse metal strip extending toward the second end of the substrate layer; the second end of the first longitudinal metal strip extends outward to a fourth end adjacent to the substrate layer and is connected to a fifth transverse metal strip extending toward the second end of the substrate layer.

[0010] Furthermore, the grounding metal strip includes a fifth transverse metal strip arranged near the fourth end of the substrate layer, a sixth transverse metal strip arranged near the third end of the substrate layer, and a sixth longitudinal metal strip arranged near the first end of the substrate layer, the ground wire feed point welding area is arranged at the second end of the fifth transverse metal strip, and the first end of the fifth transverse metal strip, the first end of the sixth transverse metal strip and the first end of the connecting metal strip are all connected to the sixth longitudinal metal strip.

[0011] Furthermore, the length of the sixth transverse metal strip is less than that of the fifth transverse metal strip, the position of the sixth transverse metal strip corresponds to the first transverse metal strip, and the first end of the first transverse metal strip extends leftward into the grounding area and is close to the second end of the sixth transverse metal strip.

[0012] Furthermore, the ground wire feed point welding area is "L"-shaped, including a transverse welding area and a longitudinal welding area located on the side of the transverse welding area facing the connecting metal strip, the longitudinal welding area is located at the second end of the transverse welding area, and the grounding copper foil is fixedly connected to the transverse welding area.

[0013] Furthermore, the substrate layer includes an insulating film, a double-sided adhesive layer arranged on the front side of the insulating film, a back adhesive layer arranged on the back side of the insulating film, and a release paper bonded to the insulating film through the back adhesive layer; the signal metal strip, the grounding metal strip and the connecting metal strip are bonded and fixed to the insulating film through the double-sided adhesive layer to form a metal wiring layer; the signal feed point welding area and the ground wire feed point welding area are gold-plated layers formed by gold plating on the signal metal strip and the grounding metal strip respectively, and the substrate layer is covered with an insulating protective film on the surface where the gold-plated layer is not set.

[0014] A handheld device with communication function includes a shell and a first antenna and a second antenna arranged in the shell, wherein the first antenna and the second antenna are both circuit board antennas; the first antenna is arranged at the upper left corner of the inner cavity of the shell, and the grounding area of ​​the first antenna is located on its left side, and the antenna radiation area of ​​the first antenna is located on its right side; the second antenna is arranged at the upper right corner of the inner cavity of the shell, and the grounding area of ​​the second antenna is located on its right side, and the antenna radiation area of ​​the second antenna is located on its left side.

[0015] In the present invention, the signal metal strip is arranged on one side of the substrate layer, thereby reducing the range of the radiation area of ​​the signal metal strip. When applied to a handheld setting, the signal metal strip can be better protected from being blocked, and it is convenient to use it as a built-in antenna such as a built-in Wi-Fi antenna in a handheld device such as a palmtop device. The area occupied by the signal metal strip can also be reduced, thereby increasing the area of ​​the grounding metal strip, and the area of ​​the grounding copper foil can be reduced while ensuring that the antenna performance does not decrease significantly, thereby saving the antenna cost. By improving the shape of the signal metal strip to a serpentine structure and optimizing the positions of the signal feed point welding area and the ground wire feed point welding area, the radiation efficiency of the antenna is made higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 The figure is a schematic diagram of the structure of a circuit board antenna in the prior art.

[0018] Figure 2 It is a schematic structural diagram of an embodiment of a circuit board antenna of the present invention.

[0019] Figure 3 Schematic diagram of the structure of the antenna body.

[0020] Figure 4 It is a cross-sectional schematic diagram of the boundary area between a portion where a gold-plated layer is provided and a portion where a gold-plated layer is not provided on a metal wiring layer.

[0021] Figure 5 Schematic diagram of the structure of the metal wiring layer and the gold-plated layer.

[0022] Figure 6 Schematic diagram of the structure of the radio frequency cable.

[0023] Figure 7 FIG. 1 is a schematic diagram of antenna layout in an embodiment of a handheld device with communication function of the present invention.

[0024] Figure 8 This is a schematic diagram showing that the antenna position partially overlaps with the grip area of ​​the handheld device when using an existing circuit board antenna.

[0025] Fig. 9 It is a schematic diagram showing that the antenna position partially overlaps with the grip area of ​​the handheld device when the circuit board antenna of this embodiment is used.

[0026] Fig.10 The present invention is an antenna performance test table of an existing circuit board antenna in a hand-held state.

[0027] Fig.11 This is an antenna performance test table of the circuit board antenna of this embodiment in a hand-held state.

[0028] The accompanying drawings in the specification are as follows:

[0029] Base material layer-100; grounding area-101; antenna radiation area-102; insulating film-110; double-sided adhesive layer-120; back adhesive layer-130; release paper-140;

[0030] Metal wiring layer-200; signal metal strip-210; ground metal strip-220; connection metal strip-230;

[0031] first longitudinal metal strip-251; second longitudinal metal strip-252; third longitudinal metal strip-253; fourth longitudinal metal strip-254; fifth longitudinal metal strip-255; sixth longitudinal metal strip-256;

[0032] first transverse metal strip-261; second transverse metal strip-262; third transverse metal strip-263; fourth transverse metal strip-264; fifth transverse metal strip-265; sixth transverse metal strip-266;

[0033] Gold plating layer - 300; signal feed point welding area - 310; ground wire feed point welding area - 320; horizontal welding area - 321; vertical welding area - 322; OSP film - 400; insulation protection film - 500; grounding copper foil - 600;

[0034] Radio frequency cable-700; signal line-701; ground line-702; first insulating layer-711; second insulating layer-712; connecting terminal-720; terminal protective cover-730;

[0035] Substrate-800; first metal strip-810; second metal strip-820; third metal strip-830; first welding area-840; second welding area-850; third welding area-860; copper foil-870;

[0036] Housing 900 ; cavity 901 ; first antenna 910 ; second antenna 920 , grip area 930 . DETAILED DESCRIPTION

[0037] The following describes the implementation methods of the present invention through specific examples. The illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention. The following embodiments and features in the embodiments may be combined with each other without conflict.

[0038] See also Figure 1 A circuit board antenna in the prior art includes a substrate 800 and a first metal strip 810, a second metal strip 820 and a third metal strip 830 arranged on the substrate 800, wherein the first metal strip 810 is distributed in the upper half and the right half of the substrate 800, the second metal strip 820 is arranged in the lower left part of the substrate 800, the third metal strip 830 is arranged in the lower part of the substrate 800, and the left end of the third metal strip 830 is connected to the second metal strip 820, and the right end is connected to the first metal strip 810.

[0039] The first metal strip 810 is provided with a first welding area 840 for connecting the RF cable signal line, the second metal strip 820 is provided with a second welding area 850 for connecting the RF cable ground line, and the connecting area between the third metal strip 830 and the second metal strip 820 is provided with a third welding area 860, and a copper foil 870 for grounding is welded and fixed to the third welding area 860.

[0040] With the above structure, since the first metal strip 810 used for radiation of the antenna occupies the entire upper area and most of the right area of ​​the substrate 800, the environment around the antenna is relatively high, and there must be no shielding in the area near the first metal strip 810, otherwise it will have a significant impact on the performance of the antenna. In addition, since the area of ​​the second metal strip 820 used for grounding on the substrate 800 is relatively small, a relatively large area of ​​copper foil 870 is required, which also increases the manufacturing cost of the antenna.

[0041] See also Figure 2 , Figure 2 FIG. 1 is a schematic diagram of the structure of an embodiment of a circuit board antenna of the present invention. The circuit board antenna of this embodiment includes an antenna body and a radio frequency cable 700 connected to the antenna body. Figure 3The antenna body includes a substrate layer 100, and the substrate layer 100 is sequentially provided with a grounding area 101 and an antenna radiation area 102 along its length direction; the grounding area 101 is provided with a grounding metal strip 220, and the antenna radiation area 102 is provided with a signal metal strip 210, and the grounding metal strip 220 and the signal metal strip 210 are connected by a connecting metal strip 230. By dividing the left and right side areas of the substrate layer 100 into the grounding area 101 and the antenna radiation area 102 respectively, and setting the signal metal strip 210 in the antenna radiation area 102, the range of the radiation area of ​​the signal metal strip 210 is reduced, and when applied to a handheld setting, the signal metal strip 210 can be better avoided from being blocked, so that it is convenient to be used as a built-in antenna such as a built-in WI FI antenna in a handheld device such as a palm device.

[0042] In this embodiment, the substrate layer 100 includes first ends (i.e. Figure 3 The left end of the substrate layer 100) and the second end (i.e. Figure 3 The right end of the substrate layer 100 in the middle), and the third end (i.e. Figure 3 The upper end of the substrate layer 100) and the fourth end (i.e. Figure 3 The grounding area 101 is an area on the substrate layer 100 close to its left end, and the antenna radiation area 102 is an area on the substrate layer 100 close to its right end.

[0043] A signal feed point welding area 310 is provided on the signal metal strip 210, and a ground wire feed point welding area 320 is provided on the ground metal strip 220, and the ground wire feed point welding area 320 is connected to a ground copper foil 600; the signal line 701 at one end of the RF cable is connected to the signal feed point, and the ground wire 702 is connected to the ground feed point, and a connection terminal 720 is provided at the other end of the RF cable.

[0044] See also Figure 4 The circuit board antenna of this embodiment is preferably in the form of a flexible circuit board antenna, wherein the substrate layer 100 includes an insulating film 110, a double-sided adhesive layer 120 disposed on the front of the insulating film 110, an adhesive layer 130 disposed on the back of the insulating film 110, and a release paper 140 bonded to the insulating film 110 through the adhesive layer 130. The signal metal strip 210, the grounding metal strip 220 and the connecting metal strip 230 are bonded and fixed on the insulating film 110 through the double-sided adhesive layer 120, thereby forming a metal wiring layer 200; the metal wiring layer 200 is generally a copper layer. The signal feed point welding area 310 and the ground wire feed point welding area 320 are gold-plated layers 300 formed by gold plating on the signal metal strip 210 and the grounding metal strip 220, respectively.

[0045] In order to protect the gold-plated layer 300, before the radio frequency cable 700 is welded to the antenna body, the surface of the gold-plated layer 300 is generally covered with a layer of OSP film 400 (Organic Solderability Preservative). OSP is a surface treatment technology mainly used on printed circuit boards. It is to grow a layer of organic film on the clean bare copper surface by chemical methods to prevent oxidation and corrosion of the copper surface. When the radio frequency cable 700 is subsequently welded, the OSP film 400 will be quickly removed by the flux in the high temperature of welding, so that the exposed clean copper surface can be immediately combined with the molten solder in a very short time to form a solid solder joint. That is, after welding the radio frequency cable, the OSP film 400 on the surface of the gold-plated layer 300 will be removed.

[0046] The surface of the substrate layer 100 in the area where the gold-plated layer 300 is not provided (including the surface of the metal wiring layer 200) is covered with an insulating protective film 500, so that the surface of the metal wiring layer 200 and the substrate layer 100 can be protected by the insulating protective film 500. When in use, the release paper 140 can be torn off, and the circuit board antenna can be pasted and fixed at the desired position through the adhesive layer 130. It should be noted that Figure 3 In order to facilitate the display of the structure of the metal wiring layer 200 and the gold plating layer 300, the insulating protection film 500 and the OSP film 400 are not shown.

[0047] See also Figure 5 The signal metal strip 210 is arranged in a serpentine shape in the antenna radiation area 102 to increase the electrical length of the antenna in a limited setting area, and more area can be reserved for setting the grounding metal strip 220, so that a smaller grounding copper foil 600 can be used to save costs. The serpentine structure of the signal metal strip 210 can be formed by connecting multiple longitudinal metal strips and multiple transverse metal strips. For example, the upper end of the longitudinal metal strip of the odd-numbered level from left to right is connected to the upper end of the longitudinal metal strip of the next level through a transverse metal strip, and the lower end of the longitudinal metal strip of the even-numbered level is connected to the lower end of the longitudinal metal strip of the next level through a transverse metal strip. Of course, the lower end of the longitudinal metal strip of the odd-numbered level from left to right can also be connected to the lower end of the longitudinal metal strip of the next level through a transverse metal strip, and the upper end of the longitudinal metal strip of the even-numbered level can be connected to the upper end of the longitudinal metal strip of the next level through a transverse metal strip.

[0048] In this embodiment, the signal metal strip 210 may include a first longitudinal metal strip 251, a second longitudinal metal strip 252, a third longitudinal metal strip 253 and a fourth longitudinal metal strip 254 which are arranged in parallel from the side of the antenna radiation area 102 adjacent to the ground area 101 to the side adjacent to the right end of the substrate layer 100 (i.e., from left to right). The first end of the first longitudinal metal strip 251 (i.e., Figure 5 The upper end of the first longitudinal metal strip 251 in the middle) is connected to the first end of the second longitudinal metal strip 252 through the first transverse metal strip 261, and the second end of the second longitudinal metal strip 252 (i.e. Figure 5 The lower end of the second longitudinal metal strip 252 in the middle) is connected to the second end of the third longitudinal metal strip 253 through the second transverse metal strip 262, and the first end of the third longitudinal metal strip 253 is connected to the first end of the fourth longitudinal metal strip 254 through the third transverse metal strip 263, thereby forming a serpentine signal metal strip 210. The middle part of the first longitudinal metal strip 251 is connected to the right end of the connecting metal strip 230, and the signal feeding point welding area 310 is arranged on the side of the connecting area between the first longitudinal metal strip 251 and the connecting metal strip 230 facing the second end of the first longitudinal metal strip 251.

[0049] In order to increase the electrical length of the signal metal strip 210, the second end of the fourth longitudinal metal strip 254 is connected to the fourth transverse metal strip 264 extending toward the right end of the substrate layer 100 (i.e., extending to the right); the second end of the first longitudinal metal strip 251 extends downward to the lower end adjacent to the substrate layer 100 and is connected to the fifth transverse metal strip 265 extending to the right.

[0050] Please continue reading Figure 5 In this embodiment, the grounding metal strip 220 may include a fifth transverse metal strip 265 disposed adjacent to the lower end of the substrate layer 100, a sixth transverse metal strip 266 disposed adjacent to the upper end of the substrate layer 100, and a sixth longitudinal metal strip 256 disposed adjacent to the left end of the substrate layer 100. The ground wire feed point welding area 320 is disposed at the second end (i.e., Figure 5 The first end of the fifth transverse metal strip 265 (i.e. Figure 5 The left end of the fifth transverse metal strip 265), the first end of the sixth transverse metal strip 266 (ie Figure 5 The left end of the sixth transverse metal strip 266 in the middle) and the first end of the connecting metal strip 230 (i.e. Figure 5 The left end of the connecting metal strip 230 is connected to the sixth longitudinal metal strip 256. Figure 1 The structure increases the area of ​​the grounding metal strip 220. Therefore, when the size of the grounding copper foil 600 of this embodiment is 9 mm×8 mm, it is similar to the structure of the grounding metal strip 220. Figure 1The antenna structure has a copper foil 870 with a size of 10 mm×9 mm and the antenna performance is basically the same, so the antenna performance will not be significantly reduced when the size of the grounding copper foil 600 is reduced.

[0051] The length of the sixth transverse metal strip 266 is less than that of the fifth transverse metal strip 265. The length of the sixth transverse metal strip 266 is generally 0.3 to 0.8 times the length of the fifth transverse metal strip 265. In this embodiment, the length of the sixth transverse metal strip 266 is approximately half the length of the fifth transverse metal strip 265. The position of the sixth transverse metal strip 266 corresponds to the first transverse metal strip 261. The first end (i.e. Figure 5 The left end of the first transverse metal strip 261 in the middle) extends to the left into the grounding area 101 and is close to the second end of the sixth transverse metal strip 266 (i.e. Figure 5 The right end of the sixth horizontal metal strip 266 in the middle), thereby further increasing the electrical length of the signal metal strip 210.

[0052] The ground wire feed point welding area 320 is in an "L" shape, including a transverse welding area 321 and a longitudinal welding area 322 located on the side of the transverse welding area 321 facing the connecting metal strip 230, and the longitudinal welding area 322 is located at the second end (i.e. Figure 5 The grounding copper foil 600 is fixedly connected to the horizontal welding area 321, and the vertical welding area 322 is used to connect the ground wire 702 of the RF cable, thereby replacing the ground wire feed point welding area 320 with an "L" shape. Figure 1 The second welding area 850 and the third welding area 860 in the existing antenna structure.

[0053] See also Figure 6 The RF cable 700 includes a signal line 701, a first insulating layer 711 wrapping the signal line 701, a ground line 702 in a mesh shape on the first insulating layer 711, and a second insulating layer 712 wrapping the ground line 702. The second end (i.e. Figure 2 The right end of the RF cable 700) is welded and fixed to the signal feed point welding area 310 of the antenna structure. The second end of the ground wire 702 of the RF cable 700 (i.e. Figure 2 The right end of the RF cable 700) is welded and fixed to the ground wire feed point welding area 320 of the antenna structure. The first end of the RF cable 700 (i.e. Figure 2 The left end of the RF cable 700 extends outward from the first end of the substrate layer 100 and is provided with a connection terminal 720. Of course, the connection terminal 720 is generally also provided with a terminal protection sleeve 730 to protect the connection terminal 720.

[0054] In this embodiment, the signal metal strip 210 is arranged in the antenna radiation area 102 on one side of the substrate layer 100, thereby reducing the range of the radiation area of ​​the signal metal strip 210. When applied in a hand-held setting, the signal metal strip 210 can be better avoided from being blocked, and it is convenient to be used as a built-in antenna such as a built-in WI FI antenna in handheld devices such as handheld game consoles. In addition, by improving the shape of the signal metal strip 210 to a serpentine structure, the electrical length of the antenna can be increased, and by adjusting the positions of the signal feed point welding area 310 and the ground wire feed point welding area 320, the positions of the signal feed point and the ground feed point are optimized, so that the radiation efficiency of the antenna is higher. The signal metal strip 210 is only located on one side of the substrate layer 100, which can reduce the area occupied by the signal metal strip 210, thereby increasing the area of ​​the grounding metal strip 220, and can reduce the area of ​​the grounding copper foil 600 while ensuring that the antenna performance is not significantly reduced, thereby saving the antenna cost.

[0055] See also Figure 7 , Figure 7 It is a structural schematic diagram of an embodiment of a handheld device with communication function of the present invention. This embodiment is explained by taking the handheld device as a handheld game console as an example. Of course, the handheld device can also be other handheld devices. The handheld device with communication function of this embodiment includes a housing 900 and a first antenna 910 and a second antenna 920 arranged in the housing 900. The first antenna 910 and the second antenna 920 adopt the circuit board antenna of any of the above embodiments. The first antenna 910 and the second antenna 920 can be WI FI antennas. The first antenna 910 is arranged on the side wall at the upper left corner of the cavity 901 inside the housing 900, and the grounding area 101 of the first antenna 910 is located on its left side (i.e., toward the left edge of the cavity 901), and the antenna radiation area 102 of the first antenna 910 is located on its right side (i.e., toward the middle of the cavity 901). The second antenna 920 is arranged on the side wall at the upper right corner of the cavity 901 inside the shell 900, and the grounding area 101 of the second antenna 920 is located on its right side (i.e., toward the right edge of the cavity 901), and the antenna radiation area 102 of the second antenna 920 is located on its left side (i.e., toward the middle of the cavity 901). Of course, the handheld device with communication function also includes other units such as processor unit, display unit, key unit, etc. These are all prior art and have nothing to do with the improvement points of this embodiment, and will not be elaborated here. It should be noted that in order to facilitate the display of the layout of the first antenna 910 and the second antenna 920, Figure 7 The rear cover of the housing 900 is removed, and only the positions of the first antenna 910 and the second antenna 920 in the cavity 901 are shown, without showing the structures and positions of other modules of the handheld device.

[0056] Please continue reading Figure 7 When a user uses a handheld device such as a handheld game console, his hands will hold the left and right parts of the handheld device respectively. The areas where his left hand and right hand usually hold the handheld device are two hand holding areas 930 respectively. Figure 7 It can be seen that due to the layout requirements of each unit inside the shell 900 of the handheld device, the first antenna 910 and the second antenna 920 are respectively arranged at the upper left corner and the upper right corner of the cavity 901 inside the shell 900, so that the left area of ​​the first antenna 910 and the right area of ​​the second antenna 920 are just located in the handholding area 930, and thus will be blocked by the user's hand when in use.

[0057] See also Figure 8 If you use Figure 1 In the circuit board antenna, the first metal strip 810 for radiation is partially located in the hand-grip area 930, and will be partially blocked by the user's hand during use, thereby reducing the radiation performance of the antenna. Fig. 9 After adopting the circuit board antenna structure in this embodiment, since the signal metal strip 210 used for radiation only occupies one side area of ​​the substrate layer 100, the first antenna 910 and the second antenna 920 can be set on one side of the grounding metal strip 220 to be set in the hand-holding area 930, so that the first antenna 910 and the second antenna 920 are set on one side of the signal metal strip 210 to be located outside the hand-holding area 930, thereby avoiding the signal metal strip 210 being blocked by the hand.

[0058] See also Fig.10 , the first antenna 910 and the second antenna 920 use Figure 1 When the antenna structure is used, the antenna performance test table is obtained by testing multiple frequency points of the three bands of 802.11.g band, 802.11.a band and WI FI 6E band in the hand-held state. Please refer to Fig.11 , is a test table of antenna performance obtained by testing multiple frequency points of three bands, 802.11.g band, 802.11.a band and WI FI 6E band, when the first antenna 910 and the second antenna 920 adopt the antenna structure of this embodiment in the hand-held state. By comparison, it can be seen that in the hand-held state, using Figure 1 The average efficiency of the circuit board antenna with the antenna structure is -7.15dB, and the average gain of the antenna is -2.24dB; after the antenna structure is improved in this embodiment, the average efficiency of the antenna is -6.86dB, and the average gain of the antenna is 2.58dB, that is, after the first antenna 910 and the second antenna 920 adopt the structure of this embodiment, the average efficiency of the antenna is improved by 0.29dB, and the average gain of the antenna is improved by 4.82dB.

[0059] In this embodiment, the first antenna 910 and the second antenna 920 adopt an optimized circuit board antenna structure, and the signal metal strip 210 of the first antenna 910 and the second antenna 920 is located outside the hand-holding area 930, which can prevent the user from blocking the signal metal strip 210 when using a handheld device, thereby improving the efficiency and gain of the antenna, avoiding delays and freezes caused by the influence of antenna signals when the user uses the handheld device, and is beneficial to improving the user experience.

[0060] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A circuit board antenna, characterized in that: It includes an antenna body and a radio frequency cable connected to the antenna body, the antenna body includes a substrate layer, and the substrate layer is sequentially provided with a grounding area and an antenna radiation area along its length direction; the grounding area is provided with a grounding metal strip, and the antenna radiation area is provided with a signal metal strip, and the grounding metal strip and the signal metal strip are connected by a connecting metal strip; a signal feeding point welding area is provided on the signal metal strip, and a ground wire feeding point welding area is provided on the grounding metal strip, and the ground wire feeding point welding area is connected with a grounding copper foil; the signal wire at one end of the radio frequency cable is connected to the signal feeding point, and the ground wire is connected to the ground feeding point, and the other end of the radio frequency cable is provided with a connecting terminal.

2. The circuit board antenna according to claim 1, wherein: The substrate layer includes a first end and a second end arranged opposite to each other in its length direction, and a third end and a fourth end arranged opposite to each other in its width direction; the grounding area is an area on the substrate layer close to its first end, and the antenna radiation area is an area on the substrate layer close to its second end.

3. The circuit board antenna according to claim 2, wherein: The signal metal strip is arranged in a serpentine shape within the antenna radiation area.

4. The circuit board antenna according to claim 3, characterized in that: The signal metal strip includes a first longitudinal metal strip, a second longitudinal metal strip, a third longitudinal metal strip and a fourth longitudinal metal strip which are arranged in parallel in sequence from the side of the antenna radiation area adjacent to the grounding area to the side adjacent to the second end of the substrate layer. The first end of the first longitudinal metal strip is connected to the first end of the second longitudinal metal strip through the first transverse metal strip, the second end of the second longitudinal metal strip is connected to the second end of the third longitudinal metal strip through the second transverse metal strip, and the first end of the third longitudinal metal strip is connected to the first end of the fourth longitudinal metal strip through the third transverse metal strip; the middle part of the first longitudinal metal strip is connected to the connecting metal strip, and the signal feeding point welding area is arranged on the side of the connection area between the first longitudinal metal strip and the connecting metal strip facing the second end of the first longitudinal metal strip.

5. The circuit board antenna according to claim 4, characterized in that: The second end of the fourth longitudinal metal strip is connected to a fourth transverse metal strip extending toward the second end of the substrate layer; the second end of the first longitudinal metal strip extends outward to a fourth end adjacent to the substrate layer and is connected to a fifth transverse metal strip extending toward the second end of the substrate layer.

6. The circuit board antenna according to claim 4 or 5, characterized in that: The grounding metal strip includes a fifth transverse metal strip arranged near the fourth end of the substrate layer, a sixth transverse metal strip arranged near the third end of the substrate layer, and a sixth longitudinal metal strip arranged near the first end of the substrate layer. The ground wire feed point welding area is arranged at the second end of the fifth transverse metal strip, and the first end of the fifth transverse metal strip, the first end of the sixth transverse metal strip and the first end of the connecting metal strip are all connected to the sixth longitudinal metal strip.

7. The circuit board antenna according to claim 6, characterized in that: The length of the sixth transverse metal strip is less than that of the fifth transverse metal strip, the position of the sixth transverse metal strip corresponds to the first transverse metal strip, and the first end of the first transverse metal strip extends leftward into the grounding area and is close to the second end of the sixth transverse metal strip.

8. The circuit board antenna according to claim 6, wherein: The ground wire feed point welding area is "L" shaped, including a transverse welding area and a longitudinal welding area located on the side of the transverse welding area facing the connecting metal strip, the longitudinal welding area is located at the second end of the transverse welding area, and the grounding copper foil is fixedly connected to the transverse welding area.

9. The circuit board antenna according to claim 6, wherein: The substrate layer includes an insulating film, a double-sided adhesive layer arranged on the front side of the insulating film, a back adhesive layer arranged on the back side of the insulating film, and a release paper bonded to the insulating film through the back adhesive layer; the signal metal strip, the grounding metal strip and the connecting metal strip are bonded and fixed to the insulating film through the double-sided adhesive layer to form a metal wiring layer; the signal feed point welding area and the ground wire feed point welding area are gold-plated layers formed by gold plating on the signal metal strip and the grounding metal strip respectively, and the substrate layer is covered with an insulating protective film on the surface where the gold-plated layer is not provided.

10. A handheld device with communication function, characterized in that: The invention comprises a shell and a first antenna and a second antenna arranged in the shell, wherein the first antenna and the second antenna both adopt the circuit board antenna according to any one of claims 1 to 9; the first antenna is arranged at the upper left corner of the inner cavity of the shell, and the grounding area of ​​the first antenna is located on the left side thereof, and the antenna radiation area of ​​the first antenna is located on the right side thereof; The second antenna is arranged at the upper right corner of the inner cavity of the shell, and the grounding area of ​​the second antenna is located on the right side thereof, and the antenna radiation area of ​​the second antenna is located on the left side thereof.

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