Multi-frequency PCB onboard antenna structure

Abstract

The utility model relates to the technical field of radio frequency antennas, in particular to a multi-frequency PCB (printed circuit board) on-board antenna structure. The utility model discloses a multi-frequency PCB onboard antenna structure, which comprises a PCB and a metal layer arranged on the upper surface of the PCB. One side of the PCB is provided with a metal edge along the thickness direction of the PCB. And one edge of the metal layer is in contact with the metal edge, so that the metal layer and the metal edge are integrated. The metal layer is provided with a plurality of slits. And the plurality of slits are not crossed, and the metal layer and the metal edge are divided into a plurality of radiators, so that multi-band signal receiving and transmitting are realized. According to the utility model, on one hand, the metal layer is provided with the plurality of slits to divide different radiators, so as to realize signal transceiving in different frequency band intervals; and on the other hand, the metal edge is arranged in the thickness direction of the PCB, so that the space in the thickness direction of the PCB is used as a part of the antenna, and the occupied area of the antenna on the upper surface of the PCB is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of radio frequency antennas, and in particular to a multi-frequency PCB board-mounted antenna structure. Background Art

[0002] Smart hardware products need antennas to transmit data over the Internet. For small-sized products, due to space limitations, external antennas are rarely used, and internal antennas are generally used - for example, the antenna is processed on the upper surface of the PCB to form a PCB onboard antenna.

[0003] However, existing PCB-mounted antennas have the following disadvantages:

[0004] 1. Narrow bandwidth and cannot adapt to multiple frequency bands;

[0005] 2. The area occupied on the upper surface of the PCB board is too large. Utility Model Content

[0006] In order to solve the problem that the existing PCB board-mounted antenna cannot adapt to multiple frequency bands and occupies a relatively large area on the upper surface of the PCB board, the utility model provides a multi-frequency PCB board-mounted antenna structure.

[0007] The utility model is implemented by the following technical solutions:

[0008] The utility model discloses a multi-frequency PCB board-mounted antenna structure, comprising a PCB board and a metal layer arranged on the upper surface of the PCB.

[0009] One side of the PCB is A; A is provided with a metal side along the thickness direction of the PCB.

[0010] The metal layer has two parallel edges, one of which is B and the other is C; B is disposed next to A and in contact with the metal edge, so that the metal layer and the metal edge form a whole.

[0011] The metal layer is provided with a plurality of slits; the starting points of the plurality of slits are located at C; the plurality of slits do not cross each other, and divide the metal layer and the metal edge into a plurality of radiators to realize multi-band signal transmission and reception.

[0012] On the one hand, the utility model divides different radiators by setting a plurality of slits on the metal layer to realize signal reception and transmission in different frequency bands; on the other hand, a metal edge is set in the thickness direction of the PCB board to use the space in the thickness direction of the PCB board to act as a part of the antenna, thereby reducing the area occupied by the antenna on the upper surface of the PCB board. The utility model solves the problem that the existing PCB board-mounted antenna cannot adapt to multiple frequency bands and occupies a large area on the upper surface of the PCB board.

[0013] As a further solution of the utility model: two slits are provided, including slit one and slit two.

[0014] C is provided with an opening 1 and an opening 2 which are spaced apart; wherein, the opening 1 is used as the starting point of the slit 1, and the opening 2 is used as the starting point of the slit 2.

[0015] The slit 1 and the slit 2 divide the metal layer and the metal edge into the radiator 1 and the radiator 2.

[0016] As a further solution of the utility model: Slit 1 includes: starting section 1, middle section 1, and ending section 1. The first end of the starting section 1 is connected to opening 1, and the second end extends vertically toward B; the middle section 1 is parallel to B; the second end of the middle section 1 is vertically connected to the second end of the starting section; the first end of the ending section 1 is vertically connected to the first end of the middle section 1, and the second end extends vertically toward B.

[0017] Slit 2 includes: starting section 2 and ending section 2; the first end of starting section 2 is connected to opening 2, and the second end extends vertically toward B; the first end of ending section 2 is vertically connected to the second end of starting section 2; and ending section 2 is parallel to B and is arranged close to B.

[0018] Among them, the vertical distance between opening 1 and opening 2 is L1; the vertical distance between end segment 1 and start segment 2 is L2; ​​the vertical distance between the second end of end segment 2 and end segment 1 is L3; L2>L1; L2>L3.

[0019] As a further solution of the utility model: a feeding point is arranged between the opening 1 and the opening 2 corresponding to C.

[0020] As a further solution of the utility model: the metal layer is a copper layer, and the metal edge is a copper edge;

[0021] Or / and, the PCB board is a FR4 board.

[0022] As a further solution of the utility model: the lengths of the starting section 1 and the middle section 1 are fixed, and the length of the ending section 1 is adjustable.

[0023] The length of the starting segment 2 is fixed, and the length of the ending segment 2 is adjustable.

[0024] As a further solution of the utility model: slit one and C divide radiator one; slit two and the metal edge divide radiator two.

[0025] As a further solution of the utility model: the length of the equivalent low-frequency emission line corresponding to the radiator is 1 / 4 wavelength of the frequency band of 880Mhz to 960Mhz.

[0026] As a further solution of the utility model: the length of the equivalent intermediate frequency emission line corresponding to the second radiator is 1 / 4 wavelength of the frequency band of 1800Mhz to 1980Mhz.

[0027] As a further solution of the utility model: the multi-frequency PCB onboard antenna structure realizes signal reception and transmission in the frequency band of 2400Mhz to 3000Mhz through resonance.

[0028] The utility model has the following beneficial effects:

[0029] 1. The utility model divides different radiators by arranging a plurality of slits on the metal layer. Different radiations have equivalent transmission lines of different lengths, and can realize signal reception and transmission in different frequency bands.

[0030] 2. The utility model sets a metal edge in the thickness direction of the PCB board to use the space in the thickness direction of the PCB board to serve as a part of the antenna, thereby reducing the area occupied by the antenna on the upper surface of the PCB board. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 A structural diagram of the multi-frequency PCB onboard antenna structure provided by the utility model;

[0033] Figure 2 for Figure 1 A top view of the multi-frequency PCB onboard antenna structure;

[0034] Figure 3 for Figure 2 The corresponding logo diagram;

[0035] Figure 4 for Figure 1 An expanded view of the multi-frequency PCB onboard antenna structure.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] 1. PCB board;

[0038] 2. Radiator 1;

[0039] 3. Slit 1, 301, starting section 1, 302, middle section 1, 303, ending section 1;

[0040] 4. Radiator 2;

[0041] 5. Slit 2, 501, starting segment 2, 502, ending segment 2;

[0042] 6. Feeding point;

[0043] 7. Antenna turning line;

[0044] 8. Metal edge;

[0045] 9. Equivalent low-frequency transmission line;

[0046] 10. Equivalent intermediate frequency transmission line. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0048] See also Figure 1 to Figure 4 The utility model provides a multi-frequency PCB onboard antenna structure, comprising: a PCB board 1, and a metal layer arranged on the upper surface of the PCB. The PCB board 1 can be a common FR4 board. The metal layer can be a copper layer or a copper alloy layer; the metal layer is attached to the PCB surface by a common printed circuit board processing method.

[0049] See also Figure 3 In some embodiments of the present invention, one side of the PCB board 1 is A. A is provided with a metal side 8 along the thickness direction of the PCB board 1. The metal side 8 can be a copper side or a copper alloy side; the metal side 8 is processed in the thickness direction of the PCB board 1 by using a pad hollowing process. The metal layer has two parallel sides, one of which is B and the other is C; B is arranged close to A and contacts the metal side 8, so that the metal layer and the metal side 8 form an integrated antenna.

[0050] So, see Figure 4 If the metal layer and the metal edge 8 are unfolded to the same plane, then A and B can be regarded as the antenna turning line 7 of the integrated antenna. This design uses the space in the thickness direction of the PCB board 1 to act as a part of the antenna, thereby reducing the area occupied by the antenna on the upper surface of the PCB board 1.

[0051] The metal layer is provided with a plurality of slits; the starting points of the plurality of slits are located at C; the plurality of slits do not cross each other, and divide the metal layer and the metal edge 8 into a plurality of radiators to realize multi-band signal transmission and reception.

[0052] See also Figure 1 , Figure 2In other embodiments of the present invention, two slits are provided, including slit 1 3 and slit 2 5. C is processed with an opening 1 and an opening 2 with a gap; wherein, opening 1 is used as the starting point of slit 1 3 and opening 2 is used as the starting point of slit 2 5.

[0053] The metal layer and the metal edge 8 are divided into a radiator 1 2 and a radiator 2 4 by using a slit 1 3 and a slit 2 5 .

[0054] Specifically, the slit 1 3 includes: a starting section 1 301, a middle section 1 302, and an ending section 1 303. The first end of the starting section 1 301 is connected to the opening 1, and the second end thereof extends vertically toward B; the middle section 1 302 is parallel to B; the second end of the middle section 1 302 is vertically connected to the second end of the starting section; the first end of the ending section 1 303 is vertically connected to the first end of the middle section 1 302, and the second end thereof extends vertically toward B.

[0055] The slit 2 5 includes: a starting section 2 501 and an ending section 2 502. The first end of the starting section 2 501 is connected to the opening 2, and the second end extends vertically toward B; the first end of the ending section 2 502 is vertically connected to the second end of the starting section 2 501; and the ending section 2 502 is parallel to B and is arranged close to B.

[0056] See also Figure 3 , the vertical distance between opening one and opening two is L1; the vertical distance between end section one 303 and starting section two 501 is L2; ​​the vertical distance between the second end of end section two 502 and end section one 303 is L3; L2>L1; L2>L3.

[0057] In this way, through the above restrictions, the slit 1 3 and C divide the radiator 1 2, and the slit 2 5 and the metal edge 8 divide the radiator 2 4.

[0058] See also Figure 4 , a feeding point 6 is provided between the opening 1 and the opening 2 corresponding to C. Then, the equivalent emission line of the radiator 1 2 can be regarded as an equivalent low-frequency emission line 9: one end of the equivalent low-frequency emission line 9 starts from the feeding point 6, and the other end first extends vertically to B, then bends vertically to the end section 1 303 and passes through the second end of the end section, then extends vertically to C, and finally bends vertically when approaching C and extends to the starting section.

[0059] The length of the equivalent low-frequency transmission line 9 determines the frequency band in which the radiator 2 can send and receive information. It should be noted that the lengths of the starting section 301 and the middle section 302 are fixed, and the length of the ending section 303 is adjustable. In other words, the length of the starting section 301 and the middle section 302 can be fixed during processing, and the length of the ending section 303 can be adjusted to change the length of the equivalent low-frequency transmission line 9. Generally, the length of the equivalent low-frequency transmission line 9 is limited to 1 / 4 wavelength of the frequency band of 880Mhz to 960Mhz, that is, the frequency band in which the radiator 2 can send and receive information is 880Mhz to 960Mhz.

[0060] In addition, the multi-frequency PCB onboard antenna structure can also realize signal reception and transmission in the frequency band of 2400Mhz~3000Mhz through frequency doubling resonance. Specifically, based on the principle of frequency doubling resonance, radiator-2 can realize signal reception and transmission in higher frequency bands, and the smaller the multiple of the frequency doubling, the more stable the signal reception and transmission effect. Then, according to the calculation formula of frequency doubling resonance: f′≈(2n+1)f, where f′ represents the frequency after resonance, f represents the frequency before resonance; n is a positive integer. Therefore, when radiator-2 realizes signal reception and transmission in the frequency band of 880Mhz~960Mhz, it can also realize signal reception and transmission in the frequency band of 2400Mhz~3000Mhz.

[0061] Similar to radiation one, the equivalent emission line of radiator two 4 can be regarded as an equivalent intermediate frequency emission line 10: one end of the equivalent intermediate frequency emission line 10 starts from the feeding point 6, and the other end first extends vertically toward B and bends vertically when approaching the end section two 502, and then extends vertically toward B and passes through the second end of the end section two 502 when approaching the second section of the end section two 502, then enters the metal edge 8 and bends vertically, and then bends vertically and extends to C when approaching the second section of the starting section.

[0062] The length of the equivalent intermediate frequency transmission line 10 determines the frequency band in which the radiator 2 4 can send and receive information. It should be noted that the length of the starting section 2 501 is fixed, and the length of the ending section 2 502 is adjustable. In other words, the length of the starting section 2 501 can be fixed during processing, and the length of the ending section 2 502 can be adjusted to change the length of the equivalent intermediate frequency transmission line 10. Generally, the length of the equivalent intermediate frequency transmission line 10 is limited to 1 / 4 wavelength of the frequency band of 1800Mhz to 1980Mhz, that is, the frequency band in which the radiator 2 4 can send and receive information is 1800Mhz to 1980Mhz.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-frequency PCB onboard antenna structure, comprising: A PCB board and a metal layer arranged on the upper surface of the PCB, characterized in that: One side of the PCB board is A; A is provided with a metal side along the thickness direction of the PCB board; The metal layer has two parallel edges, one of which is B and the other is C; B is arranged close to A and in contact with the metal edge, so that the metal layer and the metal edge form an integrated antenna; The metal layer is provided with a plurality of slits; the starting points of the plurality of slits are located at C; the plurality of slits do not cross each other, and divide the metal layer and the metal edge into a plurality of radiators to realize multi-band signal transmission and reception.

2. The multi-frequency PCB onboard antenna structure according to claim 1, characterized in that: Two slits are provided, including slit one and slit two; C is provided with an opening 1 and an opening 2 separated by a gap; wherein the opening 1 is used as the starting point of the slit 1, and the opening 2 is used as the starting point of the slit 2; The slit 1 and the slit 2 divide the metal layer and the metal edge into the radiator 1 and the radiator 2.

3. The multi-frequency PCB onboard antenna structure according to claim 2, characterized in that: The slit 1 includes: a starting section 1, a middle section 1, and an ending section 1; the first end of the starting section 1 is connected to the opening 1, and the second end thereof extends vertically toward B; the middle section 1 is parallel to B; the second end of the middle section 1 is vertically connected to the second end of the starting section; the first end of the ending section 1 is vertically connected to the first end of the middle section 1, and the second end thereof extends vertically toward B; The slit 2 includes: a starting section 2 and an ending section 2; the first end of the starting section 2 is connected to the opening 2, and the second end extends vertically toward B; the first end of the ending section 2 is vertically connected to the second end of the starting section 2; the ending section 2 is parallel to B and is arranged close to B; Among them, the vertical distance between opening 1 and opening 2 is L1; the vertical distance between end segment 1 and start segment 2 is L2; ​​the vertical distance between the second end of end segment 2 and end segment 1 is L3; L2>L1; L2>L3.

4. The multi-frequency PCB onboard antenna structure according to claim 2, characterized in that: A feeding point is arranged between opening 1 and opening 2 corresponding to C.

5. The multi-frequency PCB onboard antenna structure according to claim 1, characterized in that: The metal layer is a copper layer, and the metal edge is a copper edge; Or / and, the PCB board is a FR4 board.

6. The multi-frequency PCB onboard antenna structure according to claim 3, characterized in that: The lengths of the starting section 1 and the middle section 1 are fixed, and the length of the ending section 1 is adjustable; The length of the starting section 2 is fixed, and the length of the ending section 2 is adjustable.

7. The multi-frequency PCB onboard antenna structure according to claim 6, characterized in that: The slit 1 and C define radiator 1; the slit 2 and the metal edge define radiator 2.

8. The multi-frequency PCB onboard antenna structure according to claim 7, characterized in that: The length of the equivalent low-frequency emission line corresponding to the radiator is 1 / 4 wavelength of the frequency band of 880Mhz to 960Mhz.

9. The multi-frequency PCB onboard antenna structure according to claim 7, characterized in that: The length of the equivalent intermediate frequency emission line corresponding to the second radiator is 1 / 4 wavelength of the frequency band of 1800Mhz to 1980Mhz.

10. The multi-frequency PCB onboard antenna structure according to claim 8, characterized in that: The multi-frequency PCB onboard antenna structure realizes signal transmission and reception in the frequency band of 2400Mhz to 3000Mhz through resonance.

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