Interference detection device

Abstract

The utility model provides a device for detecting interference. The device comprises a coaxial cable, a radio frequency board and a dual-frequency antenna, the radio frequency board and the dual-frequency antenna are connected through the coaxial cable; the radio frequency board is used for sending a radio frequency signal to the dual-frequency antenna after being electrified; and the dual-frequency antenna is used for receiving the radio frequency signal and generating an interference signal aiming at the tested equipment.

Description

Technical Field

[0001] The present disclosure relates to the technical field of communication devices, and in particular, to a device for detecting interference. Background Art

[0002] Currently, there are generally two methods in the industry for testing the interference generated by mobile phones on other electronic products:

[0003] First, mobile phones of various brands are used to make continuous calls at various positions around the device under test to simulate the radiation interference generated by the mobile phone during a call, so as to detect the radiation interference received by the device under test. This method cannot cover all mobile phones, and the detection is complex with poor detection effects.

[0004] Second, a mobile phone interference signal (CPI, Cell phone interference) is used to test a patch antenna (CPItest Patch antenna, hereinafter referred to as the antenna) to simulate the operating frequency bands of the Global System for Mobile Communications (GSM) and Digital Cellular System (DCS) of mobile phone communication. A signal generator is used to output a radiation interference signal through the antenna to irradiate the device under test, so as to detect the radiation interference received by the device under test. When using this method, it is necessary to adjust the signal generator to output signals of different frequencies to the antenna. The signal generator is expensive, not easy to move, and the operation is complex, requiring a dedicated person in the laboratory to operate; and the antenna is a single-frequency antenna, and different antennas need to be continuously replaced.

[0005] Therefore, how to detect radiation interference quickly, conveniently and at low cost is a problem that needs to be solved currently. Summary of the Utility Model

[0006] The present disclosure provides a device for detecting interference to at least solve the above technical problems existing in the prior art.

[0007] A device for detecting interference provided by the present disclosure, the device includes: a coaxial cable, a radio frequency board and a dual-frequency antenna; the radio frequency board and the dual-frequency antenna are connected through the coaxial cable;

[0008] The radio frequency board is configured to send a radio frequency signal to the dual-frequency antenna after being powered on;

[0009] The dual-frequency antenna is configured to receive the radio frequency signal and generate an interference signal for the device under test.

[0010] In the above solution, the radio frequency board includes: a signal transmitter, an intermediate frequency filter, a radio frequency transmitter, a radio frequency filter and a power amplifier;

[0011] The signal transmitter is used to output an intermediate-frequency signal within a first frequency range;

[0012] The intermediate-frequency filter is used to filter the intermediate-frequency signal to obtain a filtered intermediate-frequency signal; and send the filtered intermediate-frequency signal to the radio-frequency transmitter;

[0013] The radio-frequency transmitter is used to convert the filtered intermediate-frequency signal into a radio-frequency signal; and send the radio-frequency signal to the radio-frequency filter;

[0014] The radio-frequency filter is used to filter the radio-frequency signal to obtain a filtered radio-frequency signal; and send the filtered radio-frequency signal to the power amplifier;

[0015] The power amplifier is used to amplify the power of the filtered radio-frequency signal to obtain an amplified radio-frequency signal; and send the amplified radio-frequency signal to the dual-frequency antenna.

[0016] In the above solution, the dual-frequency antenna includes: a grounded metal plane, a radiating metal sheet, and a shorting metal sheet;

[0017] One end of the shorting metal sheet is connected to the grounded metal plane, and the other end of the shorting metal sheet is connected to the first side of the radiating metal sheet;

[0018] The grounded metal plane and the radiating metal sheet are parallel, and the radiating metal sheet is located on the first surface of the grounded metal plane;

[0019] The radiating metal sheet is a square metal sheet, and the square metal sheet forms a first square radiation region; there is a U-shaped groove in the radiating metal sheet, and a second square radiation region is formed within the U-shaped groove.

[0020] In the above solution, a coaxial connector is provided on the grounded metal plane, the coaxial connector is connected to the coaxial cable, and the core of the coaxial connector is connected to the radiating metal sheet.

[0021] In the above solution, the dual-frequency antenna further includes: a dielectric substrate;

[0022] The grounded metal plane and the dielectric substrate have the same area;

[0023] The dielectric substrate is located between the grounded metal plane and the radiating metal sheet, and the dielectric substrate is provided with a first hole and a second hole;

[0024] The core of the coaxial connector passes through the first hole, and the shorting metal sheet passes through the second hole.

[0025] In the above solution, the dual - band antenna further includes: a wooden bracket; one end of the wooden bracket is installed on the second surface of the grounding metal plane of the dual - band antenna.

[0026] In the above solution, the device further includes: a power adapter for providing electrical energy for the RF board.

[0027] In the above solution, the center frequencies of the dual - band antenna are: 914.8 MHz and 1800 MHz.

[0028] In the above solution, the first frequency range is 300 MHz - 400 MHz;

[0029] The frequency range of the RF signal is 800 MHz - 4000 MHz;

[0030] The frequency range of the filtered RF signal is 850 MHz - 1850 MHz.

[0031] The device for detecting interference in the present disclosure includes: a coaxial cable, an RF board, and a dual - band antenna; the RF board and the dual - band antenna are connected through the coaxial cable; the RF board is configured to send an RF signal to the dual - band antenna after being powered on; the dual - band antenna is configured to receive the RF signal and generate an interference signal for the device under test. In this way, by generating and sending an RF signal to the dual - band antenna through the RF board, the RF board is small in volume, easy to move and convenient to operate; while the dual - band antenna can generate interference signals with two center frequencies, reducing the number of antenna replacements and improving the detection efficiency.

[0032] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become easily understandable through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become easily understandable. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, where:

[0034] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0035] Figure 1 It is a schematic structural diagram of a device for detecting interference provided by an embodiment of the present disclosure;

[0036] Figure 2 It is a schematic structural diagram of an RF board provided by an embodiment of the present disclosure;

[0037] Figure 3Schematic diagram of the structure of an intermediate frequency filter provided by an embodiment of the present disclosure;

[0038] Figure 4 Schematic diagram of the relationship between the frequency and loss of an intermediate frequency filter provided by an embodiment of the present disclosure;

[0039] Figure 5 Schematic diagram of the structure of a radio frequency filter provided by an embodiment of the present disclosure;

[0040] Figure 6 Relationship diagram of the frequency and loss of a radio frequency filter provided by an embodiment of the present disclosure;

[0041] Figure 7 Schematic diagram of the structure of a power adapter provided by an embodiment of the present disclosure;

[0042] Figure 8 Top view of a dual - frequency antenna provided by an embodiment of the present disclosure;

[0043] Figure 9 Three - dimensional schematic diagram of a dual - frequency antenna provided by an embodiment of the present disclosure;

[0044] Figure 10 Side view of a dual - frequency antenna provided by an embodiment of the present disclosure;

[0045] Figure 11 Three - dimensional schematic diagram of a dual - frequency antenna provided by an embodiment of the present disclosure;

[0046] Figure 12 Relationship diagram of the resonant frequency and the width of the short - circuit metal sheet provided by an embodiment of the present disclosure;

[0047] Figure 13 Design schematic diagram of a radiation metal sheet provided by an embodiment of the present disclosure;

[0048] Figure 14 Schematic diagram of the radiation unit of a radiation metal sheet provided by an embodiment of the present disclosure;

[0049] Figure 15 Operation schematic diagram of a device for detecting interference provided by an embodiment of the present disclosure. Detailed implementation manners

[0050] To make the objectives, features, and advantages of the present disclosure more obvious and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present disclosure.

[0051] Figure 1 A structural schematic diagram of a device for detecting interference provided by an embodiment of the present disclosure; as Figure 1 shown, the device includes: a coaxial cable, a radio frequency board, and a dual-frequency antenna; the radio frequency board and the dual-frequency antenna are connected through the coaxial cable;

[0052] The radio frequency board is configured to send a radio frequency signal to the dual-frequency antenna after being powered on;

[0053] The dual-frequency antenna is configured to receive the radio frequency signal and generate an interference signal for the equipment under test (EUT).

[0054] Wherein, the dual-frequency antenna generates interference signals with two center frequencies.

[0055] In some embodiments, the distance between the dual-frequency antenna and the equipment under test (i.e., Figure 1 the dotted part) can be approximately 0.5 mm.

[0056] In some embodiments, the radio frequency board includes: a signal transmitter 101, an intermediate frequency filter 102, a radio frequency transmitter 103, a radio frequency filter 104, and a power amplifier 105;

[0057] The signal transmitter 101 is configured to output an intermediate frequency signal within a first frequency range;

[0058] The intermediate frequency filter 102 is configured to filter the intermediate frequency signal to obtain a filtered intermediate frequency signal; and send the filtered intermediate frequency signal to the radio frequency transmitter 103;

[0059] The radio frequency transmitter 103 is configured to convert the filtered intermediate frequency signal into a radio frequency signal; and send the radio frequency signal to the radio frequency filter 104;

[0060] The radio frequency filter 104 is configured to filter the radio frequency signal to obtain a filtered radio frequency signal; and send the filtered radio frequency signal to the power amplifier 105;

[0061] The power amplifier 105 is configured to amplify the power of the filtered radio frequency signal to obtain an amplified radio frequency signal; and send the amplified radio frequency signal to the dual-frequency antenna (E1).

[0062] Specifically, through actual scenario tests, it is found that the frequency point at which the radiation of a mobile terminal (such as a mobile phone) interferes most severely with electronic products is 914.8 MHz. Therefore, the center frequencies of the dual-frequency antenna in the present disclosure are designed to be 914.8 MHz and 1800 MHz. That is, the center frequencies of the dual-frequency antenna are: 914.8 MHz and 1800 MHz.

[0063] Specifically, the first frequency range is 300 MHz - 400 MHz;

[0064] The frequency range of the radio frequency signal is 800 MHz - 4000 MHz;

[0065] The frequency range of the filtered radio frequency signal is 850 MHz - 1850 MHz.

[0066] Specifically, as Figure 2 shown, Figure 2 FIG. is a schematic structural diagram of a radio frequency board provided by an embodiment of the present disclosure; a baseband signal is output by a signal generator 101, specifically an intermediate frequency signal in a first frequency range (i.e., 300 MHz - 400 MHz); the intermediate frequency signal output after being filtered by an intermediate frequency filter 102 serves as an input signal of a radio frequency transmitter 103. The radio frequency transmitter 103 may adopt a radio frequency transmitter 103 with a model number of HMC8200LP5ME.

[0067] After frequency modulation and detection by the radio frequency transmitter 103, a radio frequency signal (a radio frequency signal of 800 MHz - 4000 MHz, which includes signals in the required GSM 900 MHz to DCS1800 MHz frequency bands) is output; the radio frequency signal passes through a radio frequency filter 104 and outputs a filtered radio frequency signal (a radio frequency signal of 850 MHz - 1850 MHz) as the radio frequency input of a power amplifier 105. The power amplifier 105 may adopt a power amplifier with a model number of HMC8205BF10.

[0068] The radio frequency signal of 850 MHz - 1850 MHz is amplified by the power amplifier, and the amplified radio frequency signal serves as the signal source of a dual - band antenna, that is, the interference source of the device under test.

[0069] Here, HMC8200LP5ME is a highly integrated intermediate frequency transmitter chip that can convert an input signal in the industry standard 300 MHz - 400 MHz into a single - ended radio frequency signal of 800 MHz to 4000 MHz at the output end.

[0070] The HMC8205BF10 power amplifier is a gallium nitride (GaN) broadband power amplifier that provides 45.5 dBm (35 W) of power and 38% power - added efficiency (PAE) at frequencies from 0.3 GHz to 6 GHz within the transient bandwidth range. Full - band operation can be achieved without external matching.

[0071] Here, the intermediate frequency filter may adopt a filter as Figure 3 shown. By adopting the following design attributes, the effect diagram as Figure 4 shown can be obtained:

[0072] Figure 3 Among them, C1, C2, C3, and C4 are all capacitors; L1, L2, L3, and L4 are all inductors; the values can be as follows:

[0073] C1 = 12.72 pF; L1 = 17.71 nH; L2 = 11.35 nH; C2 = 19.85 pF; C3 = 3.14 pF; L3 = 71.7 nH; L4 = 7.07 nH; C4 = 31.83 pF.

[0074] Figure 3 Among them, C1, C2, C3, and C4 are all capacitors; L1, L2, L3, and L4 are all inductors.

[0075] Figure 4 It represents the relationship between linear frequency and loss. Specifically, the abscissa represents the frequency (Feq) in GHz, the ordinate represents the loss, the dashed line represents the return loss, and the solid line represents the insertion loss.

[0076] The RF filter can adopt a filter as Figure 5 shown. By adopting the following design attributes, the effect diagram as Figure 6 shown can be obtained.

[0077] Figure 5 Among them, C1, C2, C3, and C4 are all capacitors; L1, L2, L3, and L4 are all inductors; the values are as follows:

[0078] C1 = 5.364 pF; L1 = 2.951 nH; L2 = 4.786 nH; C2 = 3.308 pF; C3 = 1.325 pF;

[0079] L3 = 11.95 nH; L4 = 2.984 nH; C4 = 5.305 pF.

[0080] Figure 6 It represents the relationship between linear frequency and loss. Specifically, the abscissa represents the frequency (Feq) in GHz, the ordinate represents the loss, the dashed line represents the return loss, and the solid line represents the insertion loss.

[0081] In some embodiments, the device further includes: a power adapter for supplying electrical energy to the RF board.

[0082] As Figure 7 shown, the power adapter (Adapter) converts alternating current (AC) into direct current (DC), thus providing DC Supply (DC power) to the RF board.

[0083] In some embodiments, the dual - band antenna includes: a grounded metal plane, a radiating metal sheet, and a short - circuit metal sheet;

[0084] One end of the short - circuit metal sheet is connected to the ground metal plane, and the other end of the short - circuit metal sheet is connected to the first side of the radiation metal sheet.

[0085] The ground metal plane and the radiation metal sheet are parallel, and the radiation metal sheet is located on the first surface of the ground metal plane.

[0086] The radiation metal sheet is a square metal sheet, and the square metal sheet forms a first square radiation area; there is a U - shaped groove in the radiation metal sheet, and a second square radiation area is formed in the U - shaped groove.

[0087] Here, the two corners of the U - shaped groove are right - angled, and it can also be understood as a concave - shaped groove.

[0088] The ground metal plane, the radiation metal sheet, and the short - circuit metal sheet can be made of the same metal material. For example, they can all be made of copper.

[0089] In some embodiments, a coaxial connector is provided on the ground metal plane. The coaxial connector is connected to the coaxial cable, and the core of the coaxial connector is connected to the radiation metal sheet.

[0090] In some embodiments, the dual - band antenna further includes: a dielectric substrate;

[0091] The ground metal plane and the dielectric substrate have the same area;

[0092] The dielectric substrate is located between the ground metal plane and the radiation metal sheet, and the dielectric substrate is provided with a first hole and a second hole;

[0093] The core of the coaxial connector passes through the first hole, and the short - circuit metal sheet passes through the second hole.

[0094] Here, the dielectric substrate is a substrate with a dielectric constant of about 1.0. For example, a printed circuit board with a dielectric constant of 1.05 and a flame - retardant material grade 4 (FR4) is used.

[0095] Specifically, Figure 8 is a top - view of a dual - band antenna provided by an embodiment of the present disclosure; Figure 9 is a three - dimensional schematic diagram of a dual - band antenna provided by an embodiment of the present disclosure; As shown in combination with Figure 8 and Figure 9 The dual - band antenna includes: a dielectric substrate 804, a ground metal plane 806, a short - circuit metal sheet 805, a radiation metal sheet 803, a U - shaped groove 801, and a coaxial connector 802.

[0096] Among them, the radiation metal sheet 803 is on the top. When the radio frequency signal is injected into the radiation metal sheet 803 through the coaxial connector 802, an electromagnetic field can be formed for external radiation.

[0097] The grounding metal plane 806 and the dielectric substrate 804 have the same area; below the dielectric substrate 804, the grounding metal plane 806 serves as the signal return of the antenna; the radiation metal sheet 803 and the grounding metal plane 806 are connected by a short - circuit metal sheet 805. Increasing the short - circuit metal sheet 805 can change the resonant frequency of the antenna and further reduce the antenna size.

[0098] The coaxial connector 802 serves as the injection port of the radio frequency signal source. Its housing is connected to the grounding metal plane 806, and the core of the coaxial connector 802 is connected to the radiation metal sheet 803. An open U - shaped slot 801 on the radiation metal sheet 803 can achieve dual - band operation of the antenna.

[0099] Specifically, the dielectric substrate 804 is located between the grounding metal plane 806 and the radiation metal sheet 803. And, the dielectric substrate 804 can be provided with a first hole 8041 and a second hole 8042, as Figure 10 shown. The core of the coaxial connector 802 passes through the first hole 8041, and the short - circuit metal sheet 805 passes through the second hole 8042.

[0100] In some embodiments, the dual - band antenna may further include a foam bracket 808. The foam bracket 808 can be used to support the dielectric substrate 804. The foam bracket 808 is located on the four sides of the grounding metal plane 806 and the dielectric substrate 804; as Figure 11 shown.

[0101] In some embodiments, the dual - band antenna further includes: a wooden bracket; one end of the wooden bracket is installed on the second surface of the grounding metal plane of the dual - band antenna.

[0102] Specifically, the wooden bracket serves as a bracket for the user to hold, facilitating the user to operate and move the bracket.

[0103] The following specifically describes the design idea of the dual - band antenna provided in the embodiments of the present disclosure. Combining Figure 8 、 Figure 9 shown dual - band antenna, the width (denoted as W) of the radiation metal sheet 803 has an obvious influence on the resonant frequency of the antenna. The resonant frequency will increase as the width of the radiation metal sheet increases. The effect is as Figure 12 shown, Figure 12 where the abscissa is the width of the radiation metal sheet and the ordinate is the resonant frequency. Calculated represents the derived data, and Measured represents the actually measured data.

[0104] Figure 13Schematic diagram of the radiation metal sheet provided by the embodiments of the present disclosure; as Figure 13 shown, in order to adapt to the multi-band operation of wireless communication, dual-band operation can be achieved by adopting the technology of opening a U-shaped slot (which can also be called a concave-shaped slot due to its two right-angled corners) on the radiation metal sheet 803 of the dual-band antenna. By opening the U-shaped slot, the original current path can be changed to form two relatively independent current loops to achieve dual-band operation.

[0105] Under the U-shaped slot 801, the metal sheet with length L1 and width W1 serves as the radiation unit 1 (as Figure 14 shown in the 8301 area in, that is, the first square radiation area), generating a low-frequency radiation resonance frequency F1;

[0106] The metal sheet with length L2 and width W2 serves as the radiation unit 2 (as Figure 14 shown in the 8302 area in, that is, the second square radiation area), generating a high-frequency radiation resonance frequency F2.

[0107] Figure 14 In, the short-circuit point 8303 is used to connect the short-circuit metal sheet 805; the feed point 8304 is used to connect the core of the coaxial connector 802.

[0108] The position of the short-circuit point 8303 can be set at any point on the edge of the short-circuit metal sheet 805; the position of the feed point 8304 can be set in front of the opening of the U-shaped slot.

[0109] Combined with Figure 12 the relationship of, the low-frequency resonance frequency F1 and the high-frequency resonance frequency F2 can be estimated as: where, H represents the height of the short-circuit metal sheet, the vertical height between the radiation metal sheet 803 and the ground metal plane 806, and c represents the speed of light.

[0110] In an example, through simulation and optimization, design parameters of a dual-band antenna are obtained, including:

[0111] H (representing the height of the short-circuit metal sheet, the vertical height between the radiation metal sheet 803 and the ground metal plane 806) = 10 mm; L1 (the length of the radiation unit 1) = 53.6 mm; W1 (the width of the radiation unit 1) = 32 mm;

[0112] Xg (the x-axis coordinate of the vertex of the ground metal plane) = 10 mm; Yg (the y-axis coordinate of the vertex of the ground metal plane) = 5 mm; Lg (the length of the ground metal plane) = 120 mm; Wg (the width of the ground metal plane) = 60 mm;

[0113] Xf (coaxial feeder x - axis center radius) = W / 2 = 16 mm; Yf (coaxial feeder y - axis center radius) = 5 mm; Xs (distance from short - circuit metal sheet to the upper edge of the radiation metal sheet) = 0 mm; SW (width of the short - circuit metal sheet) = 7 mm; r1 (inner core radius of the coaxial feeder) = 0.25 mm; r2 (outer diameter of the coaxial feeder) = 0.59 mm;

[0114] H1 (height of the coaxial feeder above the radiation metal sheet) = 5 mm; W_slot (width of the U - shaped slot) = 2 mm; L1_slotL1_slot (bottom length of the U - shaped slot) = 27 mm; L2_slot (height of the U - shaped slot) = 25 mm; Xslot = 2.5 mm, Yslot = 43 mm;

[0115] Among them, X_slot and Y_slot are the coordinate points for positioning the U - shaped slot; the vertex of the grounding metal plane is the coordinate point for positioning the grounding metal plane, such as the vertex at the upper left corner in the top - down view as Figure 8 ; the coaxial feeder refers to the feeding point connecting the coaxial cable.

[0116] Through the design of the above - mentioned dual - band antenna, the RF board provides RF signals in the frequency band of 850 MHz - 1850 MHz for the dual - band antenna. The dual - band antenna can generate RF signals of 914.8 MHz and 1800 MHz respectively through radiation unit 1 and radiation unit 2, and the radiation intensity below the RF signals of 914.8 MHz and 1800 MHz reaches at least 33 dBm and 30 dBm respectively.

[0117] The RF board and the dual - band antenna provided by the present disclosure solve the problem in the prior art that multiple single - band antennas are required and the antennas need to be continuously replaced. It can realize the use of one dual - band antenna. And the present disclosure takes into account that the most serious frequency point of mobile phone radiation interfering with electronic products is 914.8 MHz, and provides the center frequencies of the dual - band antenna as 914.8 MHz and 1800 MHz; the RF board uses an HMC8200LP5ME RF transmitter and an HMC8205BF10 power amplifier to send RF signals in the frequency band of 900 MHZ - 1800 MHZ, replacing the expensive laboratory signal generator, and meeting the application requirements at low cost.

[0118] In addition, considering the GSM protocol regulations, the transmitting power of a mobile phone can be controlled by a base station. The base station sends commands through the downlink Standalone Dedicated Control Channel (SACCH) to control the transmitting power level of the mobile phone. Each power difference is 2 dB. The maximum transmitting power level of a GSM 900 MHz mobile phone is 5 (33 dBm), and the minimum transmitting power level is 19 (5 dBm). The maximum transmitting power level of a DCS 1800 MHz mobile phone is 0 (30 dBm), and the minimum transmitting power level is 15 (0 dBm). Therefore, the radiation intensity of the dual-band antenna of the present disclosure reaches at least 33 dBm and 30 dBm respectively below 914.8 MHz and 1800 MHz.

[0119] In actual application, after the RF board is connected to the power adapter, it starts to work and outputs communication radiation interference in the 900 MHz - 1800 MHz frequency band. An operator can hold the dual-band antenna and place a 0.5 mm insulating foam board under the radiation metal sheet, and continuously slide the radiation metal sheet on the surface of the Equipment Under Test (EUT) to irradiate all areas of the EUT, so that the 900 MHz - 1800 MHz interference can radiate to all positions of the EUT, as Figure 15 shown.

[0120] Thus, in the solution of the present disclosure, the signal generator can generate RF signals of GSM frequency points (i.e., 914.8 MHz) and DCS frequency points (i.e., 1800 MHz) with only a small-sized RF chip, which is low-cost and movable. Only one dual-band antenna is needed to complete the signal radiation interference of two main interference RF frequency points (914.8 MHz and 1800 MHz), without the need to frequently replace multiple antennas during testing, greatly shortening the testing cycle and reducing the labor input. In addition, if there are other frequency point requirements, the frequency points can also be adjusted by adjusting the relevant parameters of the dual-band antenna, which is convenient, fast, and cost-saving.

[0121] It should be noted that in the above description, "some embodiments" are involved, which describe a subset of all possible embodiments. However, it can be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0122] Unless otherwise defined, all technical and scientific terms used in the present disclosure have the same meaning as commonly understood by those skilled in the technical field to which the present disclosure belongs. The terms used in the present disclosure are only for the purpose of describing the embodiments of the present disclosure and are not intended to limit the present disclosure.

[0123] It should be understood that in various embodiments of the present disclosure, the magnitudes of the serial numbers of the various implementation processes do not imply the sequence of execution. The execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present disclosure.

[0124] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present disclosure, "a plurality of" means two or more, unless otherwise specifically defined.

[0125] As described above, the above are only specific implementation manners of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present disclosure can easily think of changes or substitutions, which should all be covered by the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A device for detecting interference, characterized in that: The device comprises: a coaxial cable, a radio frequency board and a dual-frequency antenna; the radio frequency board and the dual-frequency antenna are connected via the coaxial cable; The radio frequency board is used to send radio frequency signals to the dual-frequency antenna after being powered on; The dual-frequency antenna is used to receive the radio frequency signal and generate an interference signal for the device under test.

2. The device according to claim 1, characterized in that The radio frequency board includes: a signal transmitter, an intermediate frequency filter, a radio frequency transmitter, a radio frequency filter and a power amplifier; The signal transmitter is used to output an intermediate frequency signal in a first frequency range; The intermediate frequency filter is used to filter the intermediate frequency signal to obtain a filtered intermediate frequency signal; and send the filtered intermediate frequency signal to the radio frequency transmitter; The radio frequency transmitter is used to convert the filtered intermediate frequency signal into a radio frequency signal; and send the radio frequency signal to the radio frequency filter; The radio frequency filter is used to filter the radio frequency signal to obtain a filtered radio frequency signal; and send the filtered radio frequency signal to the power amplifier; The power amplifier is used to amplify the power of the filtered radio frequency signal to obtain an amplified radio frequency signal; and send the amplified radio frequency signal to the dual-band antenna.

3. The device according to claim 1, characterized in that The dual-frequency antenna comprises: a grounded metal plane, a radiation metal sheet, and a short-circuit metal sheet; One end of the short-circuit metal sheet is connected to the grounded metal plane, and the other end of the short-circuit metal sheet is connected to the first side of the radiation metal sheet; The grounding metal plane is parallel to the radiating metal sheet, and the radiating metal sheet is located on a first surface of the grounding metal plane; The radiation metal sheet is a square metal sheet, and the square metal sheet forms a first square radiation area; the radiation metal sheet has a U-shaped groove, and the second square radiation area is formed in the U-shaped groove.

4. The device according to claim 3, characterized in that A coaxial connector is arranged on the grounded metal plane, the coaxial connector is connected to the coaxial cable, and a core of the coaxial connector is connected to the radiation metal sheet.

5. The device according to claim 4, characterized in that The dual-frequency antenna further includes: a dielectric substrate; The grounded metal plane and the dielectric substrate have the same area; The dielectric substrate is located between the grounded metal plane and the radiation metal sheet, and a first hole and a second hole are provided on the dielectric substrate; The core of the coaxial connector passes through the first hole, and the short-circuit metal sheet passes through the second hole.

6. The device according to claim 1, characterized in that The dual-frequency antenna further comprises: a wooden bracket; one end of the wooden bracket is mounted on the second surface of the grounded metal plane of the dual-frequency antenna.

7. The device according to claim 5, characterized in that The dual-frequency antenna further comprises: a foam bracket; the foam bracket is located at four sides of the grounded metal plane and the dielectric substrate; The foam support is used to support the dielectric substrate.

8. The device according to claim 1, characterized in that The device also includes a power adapter for converting alternating current into direct current to provide power to the radio frequency board.

9. The device according to claim 3, characterized in that The center frequencies of the dual-frequency antenna are: 914.8 MHz and 1800 MHz.

10. The device according to claim 2, characterized in that The first frequency range is 300MHz-400MHz; The frequency range of the radio frequency signal is 800MHZ-4000MHz; The frequency range of the filtered radio frequency signal is 850 MHz-1850 MHz.

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