CN217934180U - Open-circuit stub resonator and PCB antenna board finished product - Google Patents

Abstract

The scheme relates to the field of resonators, and particularly discloses an open stub resonator and a PCB antenna board manufactured product, wherein the open stub resonator comprises a shielding ring, an open stub in the shielding ring and a transverse line section vertically connected with the lower end of the open stub, the upper end of the open stub is not connected with the shielding ring, the transverse line section is provided with a first end and a second end, the first end is a signal input end, the second end is a signal output end, the length l of the open stub is = (2N + 1) × lambda/4), N ∈ (0 UN +), and the wavelength lambda is the wavelength corresponding to the working frequency of a resonance point to be measured. The open-circuit stub resonator is arranged on the periphery of the PCB antenna board manufactured product, the performance of the PCB antenna board manufactured product is tested, the open-circuit stub resonator is used for screening the PCB antenna board, and the defect that the PCB antenna board is judged to be good or bad by only measuring the size of an antenna in the prior art is overcome.

Description

Open-circuit stub resonator and PCB antenna board finished product

Technical Field

This scheme relates to the syntonizer field, especially relates to an open circuit stub section syntonizer and PCB antenna panel finished product.

Background

The existing 1/4 wavelength resonator is easy to be interfered by the outside and is easy to distort, so that the resonance point can not be clearly read.

In addition, the existing method for shipping the antenna board (determining whether the antenna board is good or bad) in the PCB factory is to measure the size of the antenna, transmission line, etc. at the designated position of the customer. And the antenna board can be delivered after being judged as a good board as long as the measured data are within the tolerance range specified by the customer. However, the factors affecting the antenna performance are not only the size of the antenna, but also various factors such as dielectric constant, roughness of copper foil, copper thickness, dielectric loss tangent, dielectric thickness, contact erosion cause the antenna performance to vary. When the customer requirements for the antenna resonance point are strict (e.g., +/-0.2GHz, +/-0.4GHz for some narrow band antennas), tighter dimensional control is not a significant aid.

SUMMERY OF THE UTILITY MODEL

In view of this, this scheme aims at overcoming at least one kind in the prior art, an open circuit stub section syntonizer and PCB antenna board finished product, the open circuit stub section syntonizer that provides is difficult for the external interference, and difficult distortion makes the resonance point can clear read out, sets up it on PCB antenna board finished product, tests PCB antenna board finished product performance, is used for screening PCB antenna board, has compensatied that only the measurement antenna size judges PCB antenna board bad not enough in the prior art.

The first aspect of the scheme is to provide an open stub resonator, where the open stub resonator includes a shielding ring, an open stub in the shielding ring, and a transverse line vertically connected to the lower end of the open stub, the upper end of the open stub is not connected to the shielding ring, the transverse line has a first end and a second end, the first end is a signal input end, the second end is a signal output end, the length l = (2n +1) × λ/4, n ∈ (0 UN +), where the wavelength λ is a resonance point to be measuredWavelength, N, corresponding to the operating frequency ₊ Is a set of positive integers, and N has a value of 0 or one of all positive integers.

The open-circuit stub resonator provided by the scheme adopts the open-circuit stub with the length being odd times of quarter wavelength (wavelength corresponding to working frequency of resonance point to be measured) to be vertically connected with the transverse line section, the shielding ring is grounded and used for shielding signals, the upper end of the open-circuit stub is not connected with the shielding ring, when the open-circuit stub resonator works, signals are input from the first end of the transverse line section, electric field distribution signals with odd times of corresponding frequency, such as quarter wavelength, three-quarter wavelength, five-quarter wavelength and the like, corresponding to the stub are radiated from the upper end of the stub section, frequency signals with other wavelengths are taken as signal output ends from the second end of the transverse line section, the insertion loss between the first end and the second end of the transverse line section is particularly large, and the stub plays the role of a quarter wavelength antenna, so that the open-circuit stub resonator is formed, is not easy to be interfered by the outside, and not easy to distort, so that the resonance point can be clearly read.

Specifically, the shape of the shielding ring may be a rectangle, a square, a circle, etc., preferably a rectangle, the distance between the upper end of the open-circuit stub and the shielding ring cannot be too small, otherwise the resonance point may be affected, and the distance between the cross line segment and the shielding ring also cannot be too small, which may affect impedance mismatch, so that the resonance point is not obvious, after a lot of experimental inventions, the inventors set the distance between the upper end of the open-circuit stub and the shielding ring, and the distance between the cross line segment and the shielding ring to be 20-50 mils, which is appropriate, where the distance between the upper end of the open-circuit stub and the shielding ring: the distance between the transverse line segment and the shielding ring is set to be 1: (0.8-1.2).

Furthermore, the shielding ring comprises two short sides, concave positions are arranged on the positions, corresponding to the transverse line segments, of the two short sides, the first ends and the second ends of the transverse line segments are embedded into the concave positions respectively, gaps are formed between the first ends and the concave positions of the second ends of the transverse line segments, and then the first ends and the second ends are signal ends and used for receiving and outputting signals.

Further, in order to be beneficial to embedding the first end and the second end into the concave position, the first end and the second end of the transverse line section are embedded into the concave position to form a shrinking portion, the line width of the shrinking portion is smaller than the line width of the main body of the transverse line section, the shrinking portion and other portions of the transverse line section are provided with arc transition, and the concave position corresponds to the arc transition to form a chamfer so that the formed gap width is equal.

Further, in order to ensure that the signal can be measured and the impedance of the signal lines is consistent, the gap cannot be too large, too small for easy production, and therefore, cannot be too small, and the width of the gap is 3.2-4.8 mil.

Further, the open stub may be one open stub or two open stubs, and in order to form a resonator with an odd quarter wavelength, the one open stub is disposed in the middle of the transverse line, and the two open stubs are symmetrically disposed on two sides of the transverse line, respectively.

Further, the rectangle shield ring still includes two long limits, and in order to make things convenient for the probe of the device of measuring the resonance point to place, the width of two minor faces of shield ring all is greater than the width on two long limits, wherein the minor face width: long side width = (1.2 to 2.0): 1.

another object of this solution is to provide a finished product of PCB antenna board, which includes a first surface and a second surface, wherein the second surface is a ground surface, the open stub resonator is disposed on the periphery of the first surface of the finished product of PCB antenna board for testing the performance of the finished product of PCB antenna board, and the shielding ring of the open stub resonator is connected to the ground surface.

Furthermore, the open stub resonator and the conductive layer on the PCB antenna finished product are formed at one time by adopting the same process.

In order to accurately test the performance of the finished PCB antenna board product without affecting the performance of the finished PCB antenna board product, the open stub resonator must be arranged on the periphery of the first surface of the finished PCB antenna board product, the shielding ring of the open stub resonator further comprises a shielding hole, the shielding ring is connected with the ground surface through the shielding hole and used for shielding signals, and the shielding ring and the conductive layer on the finished PCB antenna board product are formed in one step by the same process, for example, the same copper wire is used.

Furthermore, the PCB antenna plate manufactured product is provided with a plurality of unit plates, preferably 4 unit plates, in order to accurately measure the resonance point of the PCB antenna plate manufactured product, the open-circuit stub resonator is respectively arranged on the asymmetric positions of at least two sides of the unit plate of the PCB antenna plate manufactured product, and preferably 2 open-circuit stub resonators are arranged on the asymmetric positions of two sides of each unit plate.

A third aspect of the present invention provides a method for screening a finished PCB antenna board product, where the method for screening a finished PCB antenna board product specifically includes preparing multiple batches of finished PCB antenna boards in the same period of preparing the finished PCB antenna board product, and the step of testing the finished PCB antenna board product performance specifically includes the steps of:

s1, measuring resonance points of first batch of PCB antenna board manufactured products;

s2, determining the median of all measured resonance point data;

and S3, screening the PCB boards of other batches through the median.

Further, the step S3 specifically includes: and setting a screening threshold value of the qualified PCB based on the median value, measuring resonance points of manufactured products of other batches of PCB antenna boards, and judging that the manufactured products of the measured PCB antenna boards are qualified PCB antenna boards when the measured resonance points are within the threshold value, otherwise, judging that the manufactured products of the measured PCB antenna boards are unqualified.

Further, in order to simultaneously consider the accuracy of the qualified boards of the PCB antenna board and the number of the qualified boards, the threshold value is within ± 20%.

Further, in order to further improve the accuracy of screening the qualified PCB, after the step S3, the method further includes the following steps:

and S4, after each batch of PCB antenna board finished product is screened, returning to the step S2, iterating the median value, and determining a new median value.

In S4, the median is iterated, and the specific method for determining the new median is as follows: the resonance points of each batch of measured PCB antenna board finished products are mixed with the resonance points measured by the plurality of batches of finished products, a new median value is determined again, and the PCB board of the next batch is screened by the new median value.

Further, in the same period of preparing the PCB antenna board finished products, the steps S2 to S4 are repeated until the screening of all batches of PCB antenna board finished products is completed, so that more qualified PCB antenna board finished products are screened more accurately.

Further, because the PCB antenna board manufactured products are prepared with different performances in different PCB antenna board preparation periods, in another PCB antenna board manufactured product preparation period, the process starts from the step S1 again and then enters the loop from the step S2 to the step S4.

Further, the specific method for measuring the resonance point by S1 is as follows: and respectively embedding a probe of a measuring device and the first end and the second end of the transverse line segment into the sunken positions of the two short sides of the shielding ring for connection, and measuring the resonance point of the finished product of the PCB antenna board by the measuring device.

Compared with the prior art, the beneficial effect of this scheme does:

the short-cut line segment syntonizer of opening a way that this scheme provided is difficult for receiving external disturbance, difficult distortion makes reading that resonance point can be clear, the short-cut line segment syntonizer of opening a way that this scheme provided sets up on the PCB antenna panel finished product, the performance of the PCB antenna panel of test, be used for screening PCB antenna panel, only survey antenna size among the prior art has been remedied, thereby judge the shortcoming that PCB factory shipment antenna panel is good or bad to lead to the yields of customer end to be low, and can provide the antenna panel that has the radio frequency performance more stable and give the customer, reduce the unnecessary paster cost of customer end by a wide margin.

Drawings

Fig. 1 is a schematic diagram of a resonator having an open stub segment.

Fig. 2 is a schematic diagram of a resonator having two open stub segments.

Fig. 3 is an enlarged schematic structural view of a portion C in fig. 1 and 2.

Fig. 4 shows the resonance curves of examples 1 and 2.

Fig. 5 is a schematic structural diagram of an open stub resonator on a finished PCB antenna.

Fig. 6 is a schematic flow chart of the method for screening the manufactured PCB antenna board according to embodiment 4 of the present invention.

Fig. 7 is a schematic flow chart of the method for screening the manufactured PCB antenna board according to embodiment 5 of the present invention.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1 and 3, the present embodiment provides an open stub resonator, which includes a shielding ring 1, an open stub 2 inside the shielding ring, and a transverse line 3 vertically connected to a lower end of the open stub, where the shielding ring has two short sides, an upper end of the open stub 3 is disconnected from the shielding ring, the distance between the upper end of the open stub and the shielding ring is 38 mils, the distance between the transverse line 3 and the shielding ring is 30 mils, the open stub 2 is disposed at a middle position of the transverse line 3, the transverse line 3 has a first end 31 and a second end 32, where the first end 31 is a signal input end, the second end 32 is a signal output end, the length l of the open stub is five-quarter wavelength of an operating frequency (the operating frequency of a resonance point to be measured is 77 Ghz), the dielectric constant of the material in the present embodiment is 3.16, the thickness of the material is 0.127mm, and the length of the open stub is 3mm.

Specifically, the shielding ring is rectangular in this embodiment, the shielding ring 1 includes two short sides, the two short sides set up the sunken position 11 in the position corresponding to the horizontal segment, the first end 31 and the second end 32 of the horizontal segment are embedded into the sunken position 11 respectively, a gap 33 is formed between the first end 31 and the second end 32 of the horizontal segment and the sunken position 11, and then the first end and the second end are signal ends for receiving and outputting signals.

In order to facilitate the first end 31 and the second end 32 to be embedded into the recessed position 11, the portions of the first end 31 and the second end 32 of the transverse line segment embedded into the recessed position 11 form a contracted portion 34, the line width of the contracted portion 34 is smaller than the line width of the main body of the transverse line segment, the contracted portion 34 and the other portions of the transverse line segment 3 are provided with arc transitions 35, and the recessed position is provided with a chamfer 12 corresponding to the arc transitions, so that the formed gaps are equal in width.

Specifically, to ensure that the signal can be measured and that the signal lines have uniform impedance, the gap 33 cannot be too large, too small for easy production, and therefore not too small, and the width of the gap in this embodiment is 4 mils.

Further, in order to facilitate the placement of the probe of the resonance point measuring device, the widths of the two short sides of the shielding ring are wider than the widths of the two long sides, which is the width of the short side in this embodiment: long side width =1.2:1.

example 2

As shown in fig. 2 and 3, the present embodiment provides another open stub resonator, where the open stub resonator includes a shielding ring 1, two open stubs 21 and 22 in the shielding ring, and a transverse line 3 vertically connected to lower ends of the open stubs 21 and 22, where the shielding ring 1 has two long sides and two short sides, upper ends of the two open stubs are not connected to an upper long side 11 of the shielding ring, a distance between the upper ends of the two open stubs 21 and 22 and the upper long side 11 of the shielding ring is 38 mils, and a distance between the transverse line 3 and the shielding ring is 40 mils. The transverse line segment 3 has a first end 31 and a second end 32, the first end 31 is a signal input end, the second end 32 is a signal output end, the length of the open stub is five-quarter wavelength of the working frequency (the working frequency of the resonance point to be measured is 77 Ghz), the dielectric constant of the material in the embodiment is 3.16, the thickness is 0.127mm, and the length of the open stub is 3mm.

Specifically, the shielding ring 1 in this embodiment 1 is rectangular, the shielding ring 1 includes two short sides, the two short sides set up the sunken position 11 on the position that corresponds the horizontal line segment, the first end 31 and the second end 32 of horizontal line segment are embedded into sunken position 13 respectively, form clearance 33 between the first end 31 and the second end 32 of horizontal line segment and sunken position 11, and then the first end and the second end are signal terminals for receiving and outputting signal.

In order to facilitate the first end 31 and the second end 32 to be embedded into the recessed position 11, the portions of the first end 31 and the second end 32 of the transverse line segment embedded into the recessed position 13 form a contracted portion 34, the line width of the contracted portion 34 is smaller than the line width of the main body of the transverse line segment, the contracted portion 34 and the other portions of the transverse line segment 3 are provided with arc transitions 35, and the recessed position is provided with a chamfer 12 corresponding to the arc transitions, so that the formed gaps are equal in width.

Specifically, in order to ensure that the signal can be measured and that the impedance of the signal lines is consistent, the gap 33 cannot be too large, too small, and too small for easy production, and the width of the gap in this embodiment is 4.2 mils.

Further, in order to facilitate the placement of the probe of the resonance point measuring device, the widths of the two short sides of the shielding ring are wider than the widths of the two long sides, which is the width of the short side in this embodiment: long side width =1.5:1.

in the open stub resonators of embodiments 1 and 2, when operating, a signal is input from the first end 31 of the transverse segment, an electric field distribution signal of a corresponding frequency of odd-numbered multiples of a wavelength, such as one quarter, three quarters, five quarters, and the like, corresponding to the stub segment is radiated from the upper end of the stub segment, and frequency signals corresponding to the remaining wavelengths are signal output ends from the second end 32 of the transverse segment, so that the insertion loss between the first end 31 and the second end 32 of the transverse segment is particularly large.

The test results of the test on the open-circuited stub resonators in examples 1 and 2 are shown in fig. 4, in which the resonance curve of example 1 is a and the resonance curve of example 2 is b.

As can be seen from fig. 4, the resonance point of the resonator with two open stub segments in embodiment 2 is more obvious, and the value of the resonance point is more easily seen.

Example 3

This embodiment provides a finished product of a PCB antenna board, which adopts the same manufacturing process of the PCB antenna board, and sets the open stub resonators in embodiment 2 at the periphery of the PCB antenna board having 4 unit boards, and sets an open stub resonator at an asymmetric position on each of two sides of each unit board, so as to obtain a finished product of the PCB antenna board having the open stub resonators, as shown in fig. 5, where the finished product of the PCB antenna board includes a first surface 4 and a second surface 5, where the second surface 5 is a ground surface, and the open stub resonators are set at the periphery of the first surface 4 of the finished product of the PCB antenna board for testing the performance of the finished product of the PCB antenna board, and the shielding ring 1 of the open stub resonators further includes shielding holes 11, and the shielding ring 1 is connected to the ground surface through the shielding holes 11 for shielding signals.

Example 4

As shown in fig. 6, the method for screening a finished PCB antenna board provided in this embodiment specifically includes: in the same period of preparing a PCB antenna plate finished product (the antenna plate is a 77GHz radar plate), preparing a plurality of batches of PCB antenna plate finished products (namely a plurality of batches of PCB antenna plate finished products with open-circuit stub-section resonators), wherein the step of testing the performance of the PCB antenna plate finished products specifically comprises the following steps:

and S11, measuring resonance points of the first batch of PCB antenna board finished products, wherein in specific implementation, VNA is used as the testing device of the embodiment, probes of the measuring device are respectively connected with the first end and the second end of the transverse line section and are respectively embedded into the sunken positions of the two short sides of the shielding ring, and the resonance points of the PCB antenna board finished products are measured through the measuring device.

S12, determining the median value of all the measured resonance point data.

And S13, screening the PCBs in other batches through the median, in specific implementation, setting a screening threshold of the qualified PCBs by taking the median as a reference, wherein the threshold is within +/-20%, measuring resonance points of finished products of the PCBs in other batches (the measuring method is the same as S11), and when the measured resonance points are within the threshold, judging that the finished products of the measured PCBs are qualified, otherwise, judging that the finished products of the measured PCBs are unqualified.

Example 5

As shown in fig. 7, the method for screening a finished PCB antenna board provided in this embodiment specifically includes: in the same period of preparing a PCB antenna plate finished product (the antenna plate is a 77GHz radar plate), preparing a plurality of batches of PCB antenna plate finished products (namely a plurality of batches of PCB antenna plate finished products with open-circuit stub-section resonators), wherein the step of testing the performance of the PCB antenna plate finished products specifically comprises the following steps:

and S21, measuring resonance points of the first batch of PCB antenna board finished products, wherein in specific implementation, VNA is used as a measuring device of the embodiment, probes of the measuring device are respectively connected with the first end and the second end of the transverse line section and respectively embedded into the concave positions of the two short sides of the shielding ring, and the resonance points of the PCB antenna board finished products are measured through the measuring device.

S22, determining the median of all the measured resonance point data.

S23, screening the PCBs of other batches through the median, setting a screening threshold value of the qualified PCBs by taking the median as a reference, measuring resonance points of manufactured products of the PCBs of other batches when the threshold value is within +/-20%, and judging that the manufactured products of the measured PCBs are qualified if the measured resonance points are within the threshold value, otherwise, judging that the manufactured products of the measured PCBs are unqualified.

And S24, after each batch of PCB boards are screened, returning to the step S2, iterating the median values, determining a new median value, mixing the measured resonance points of the first batch of PCB antenna board finished products with the resonance points of the other batches of PCB antenna board finished products during specific implementation, and re-determining the new median value to screen the PCB boards of the next batch by using the new median value.

And S25, repeating the steps S22-S24 until the finished product screening of all batches of PCB antenna boards is completed.

Example 6

In another period for preparing the PCB antenna board finished product, starting from step S21 of example embodiment 5 again, the loop from S22 to S25 is entered.

Comparative example 1

And testing the PCB antenna board by a traditional method for screening.

Data of the PCB antenna boards screened for eligibility and the boards arriving at the customer's request by the methods of comparative example 1 and example 4 are shown in tables 1 and 2:

table 1 conventional method screens data of qualified PCB antenna boards and boards that reach customer requirements

Table 2 example 4 screening of qualified PCB antenna boards and board data to customer requirements

As can be seen from tables 1 and 2, when the resonance point of the antenna is stricter for the customer (for example, some narrow band antennas +/-0.2GHz, +/-0.4 GHz), the tighter the dimension control is, without significant help, in the conventional method (dimension measurement), but the method provided by the present invention can significantly increase the factory yield of the PCB antenna board by reducing the tolerance of the open stub resonator, provide the antenna board with more stable radio frequency performance to the customer, and greatly reduce the unnecessary patch cost of the customer.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the claims of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The open-circuit stub segment resonator is characterized by comprising a shielding ring, an open-circuit stub segment in the shielding ring and a transverse segment vertically connected with the lower end of the open-circuit stub segment, wherein the upper end of the open-circuit stub segment is not connected with the shielding ring, the transverse segment is provided with a first end and a second end, the first end is a signal input end, the second end is a signal output end, the length l = (2N +1) × λ/4, N ∈ (0 UN +), and the wavelength λ is the wavelength corresponding to the working frequency of a resonance point to be measured.

2. The open stub resonator according to claim 1, wherein the shielding ring comprises two short sides, the two short sides are provided with recessed locations corresponding to the positions of the cross section, the first end and the second end of the cross section are respectively embedded in the recessed locations, and a gap is formed between the first end and the second end of the cross section and the recessed locations.

3. The open stub resonator according to claim 1, wherein the first and second ends of the traverse section are embedded in the recess to form a tapered portion, the width of the tapered portion is smaller than the main width of the traverse section, the tapered portion and the other portions of the traverse section are provided with circular arc transitions, and the recess is provided with a chamfer corresponding to the circular arc transitions to make the gap widths formed uniform.

4. The open stub resonator of claim 2, wherein the gaps are 3.2-4.8 mil wide.

5. The open stub resonator according to claim 2, wherein said shield ring further comprises two long sides, each of said two short sides having a width greater than a width of each of said two long sides.

6. The open stub resonator according to any one of claims 1 to 5, wherein the open stub is one open stub or two open stubs, the one open stub is disposed at a middle position of the transverse segment, and the two open stubs are symmetrically disposed at two sides of the transverse segment.

7. A PCB antenna manufactured product is characterized in that the PCB antenna manufactured product comprises a first face and a second face, the second face is a ground face, the PCB antenna manufactured product comprises the open stub resonator which is provided with the open stub resonator according to any one of claims 1 to 6 and is arranged on the periphery of the first face and used for testing the performance of the PCB antenna manufactured product, and a shielding ring of the open stub resonator is connected with the second face.

8. The manufactured PCB antenna board as claimed in claim 7, wherein the shield loop of the open stub resonator is formed at one time by the same process as the conductive layer on the PCB antenna board.

9. The PCB antenna manufactured product of claim 7, wherein the PCB antenna manufactured product comprises a plurality of unit boards, and at least two asymmetric positions on each unit board are respectively provided with an open stub resonator.

10. The PCB antenna manufactured product of claim 7, wherein the PCB antenna manufactured product has 8 unit boards, and 2 open stub resonators are arranged at two asymmetric positions on each unit board.

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