Power supply noise test system and power supply noise test system of double-radio-frequency antenna product

Abstract

The utility model relates to a power supply noise test system and a power supply noise test system of a double radio frequency antenna product, the power supply noise test system comprises a first antenna, the first antenna is arranged in a product to be tested and is integrated on a circuit board of the product to be tested, the circuit board is provided with a radio frequency connector, and the first antenna is connected with the radio frequency connector; the second antenna is located outside a shell of a product to be tested, the second antenna is connected with the radio frequency connector through a radio frequency test line, and both the first antenna and the second antenna are radio frequency antennas; a near-field probe; the power supply noise test analysis unit comprises a low noise amplifier, an attenuator and a spectrum analyzer which are connected in sequence; the radio frequency test line and the near-field probe are connected with the low-noise amplifier through feeder lines. According to the utility model, different antennas are used to detect local or external power supply noise in a product and power supply noise in a radio frequency band and a full frequency band, so that the detection precision and sensitivity are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to signal test technical field, concretely relates to a power supply noise test system of electronic product with radio frequency antenna. BACKGROUND

[0002] The power supply is the power supply device commonly used in electronic product. The power supply will produce noise in the working process, and the unqualified noise problem directly affects the EMC and EMI test requirements of the product. Especially for the electronic products with radio frequency antenna such as router and concentrator, the radiation produced by the power supply noise will directly interfere with the transceiver of the antenna, reduce the receiving sensitivity and transmitting power of the product, and further affect the communication speed and communication distance of the product, so the test index of the power supply noise is more sensitive.

[0003] The traditional power supply noise test system adopts oscilloscope to cooperate with near-field probe to test the power supply noise, such as the power supply ripple and noise auxiliary test system disclosed in the Chinese utility model patent application with the application number 2020110173784. This test system adopts near-field probe to detect the noise of each part of the product, but the layout of the components on the internal circuit board of the product is complex and the space is narrow, so the near-field probe cannot be placed in some positions when detecting, and the noise source and the disturbed working frequency band cannot be accurately positioned, so the power supply noise can only be roughly detected, and it is difficult to accurately judge whether a specific area and a specific antenna working frequency band are disturbed by the power supply noise radiation, resulting in low sensitivity and poor test accuracy. Moreover, the power supply noise test process is not flexible enough due to the reliance on probe and oscilloscope, and it is difficult to meet the test requirements of high-integration radio frequency products. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a power supply noise test system that can improve the detection accuracy and measurement sensitivity.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0006] The power supply noise test system is used for testing the power supply noise of the product with radio frequency antenna, comprising: a first antenna, which is built-in in the product to be tested and integrated on the circuit board of the product to be tested, a radio frequency connector is arranged on the circuit board, and the first antenna is connected with the radio frequency connector; a second antenna, which is located outside the shell of the product to be tested, and is connected with the radio frequency connector through a radio frequency test line, and the first antenna and the second antenna are both radio frequency antennas; a near-field probe; a power supply noise test analysis unit, which comprises a low-noise amplifier, an attenuator and a spectrum analyzer connected in sequence; and the radio frequency test line and the near-field probe are connected with the low-noise amplifier through a feeder.

[0007] Further, the radio frequency connector has a first radio frequency port, a second radio frequency port, a third radio frequency port and a switching switch, the switching switch is used to switch the connection relationship between the first radio frequency port, the second radio frequency port and the third radio frequency port; the first radio frequency port is a signal input port, the second radio frequency port and the third radio frequency port are signal output ports, the first radio frequency port and the second radio frequency port are connected by default, when the radio frequency test line is inserted into the radio frequency connector, the connection between the first radio frequency port and the second radio frequency port is disconnected through the switching switch, and the first radio frequency port and the third radio frequency port are connected.

[0008] Further, the first antenna is a PCB antenna or a patch antenna or a spring antenna.

[0009] Further, the circuit board of the product to be tested is provided with a radio frequency signal source, and the product to be tested has a first radio frequency working mode and a second radio frequency working mode; in the first radio frequency working mode, the radio frequency signal source is connected with the first radio frequency port, the first antenna is connected with the second radio frequency port, the first radio frequency port and the second radio frequency port are connected, and the first radio frequency port and the third radio frequency port are disconnected; the working path of the first radio frequency working mode is: radio frequency signal source→radio frequency connector→first antenna; in the second radio frequency working mode, the radio frequency signal source is connected with the first radio frequency port, the second antenna is connected with the third radio frequency port through the radio frequency signal line, the connection between the first radio frequency port and the second radio frequency port is disconnected, and the first radio frequency port and the third radio frequency port are connected; the working path of the second radio frequency working mode is: radio frequency signal source→radio frequency connector→radio frequency test line→second antenna.

[0010] Further, the first power supply noise test mode and the second power supply noise test mode are included; in the first power supply noise test mode, the first antenna is connected with the first radio frequency port, the radio frequency test line is connected with the third radio frequency port, the radio frequency test line is connected with the low-noise amplifier through a feeder, the connection between the first radio frequency port and the second radio frequency port is disconnected, the first radio frequency port and the third radio frequency port are connected, and the working path of the first power supply noise test mode is: first antenna→radio frequency connector→radio frequency test line→power supply noise test analysis unit; in the second power supply noise test mode, the second antenna is connected with the radio frequency test line, the radio frequency test line is connected with the low-noise amplifier through a feeder, and the working path of the second power supply noise test mode is: second antenna→radio frequency test line→power supply noise test analysis unit; or the near-field probe is connected with the low-noise amplifier through a feeder, and the working path of the second power supply noise test mode is: near-field probe→power supply noise test analysis unit.

[0011] As can be seen from the above technical solution, this utility model utilizes a radio frequency antenna built into the product under test (DUT) and an external antenna and near-field probe outside the DUT. The built-in antenna can detect power supply noise in the radio frequency operating band, while the external antenna or near-field probe can detect power supply noise in other interference bands and across the entire frequency band. The built-in antenna can accurately locate the internal power supply noise of the product, overcoming the problems of inconvenient placement and inaccurate positioning of near-field probes in confined spaces. It has the advantages of simple structure, ease of use, low price, high testing accuracy, and wide testing range. It can be directly designed and used in mass-produced products, offering high flexibility and accuracy. Furthermore, the built-in and external antennas can be flexibly switched, allowing for arbitrary selection of either the built-in or external antenna based on the different signal radiation or reception requirements of the working environment, resulting in low cost.

[0012] This utility model also provides a power supply noise testing system for a dual-RF antenna product. The dual-RF antenna product includes a housing, a first antenna, a second antenna, an RF connector, an RF signal source, and a circuit board. The circuit board is disposed within the housing, and the RF connector and the RF signal source are disposed on the circuit board. The first antenna is a built-in antenna integrated on the circuit board, and the second antenna is an external antenna. The first antenna is connected to the RF connector through internal circuitry of the circuit board, and the second antenna is connected to the RF connector through RF test lines. The power supply noise testing system includes the first antenna, the second antenna, a near-field probe, and a power supply noise testing and analysis unit. The power supply noise testing and analysis unit includes a low-noise amplifier, an attenuator, and a spectrum analyzer connected in sequence. The RF test lines and the near-field probe are connected to the low-noise amplifier through feed lines.

[0013] As described above, the power supply noise testing system further includes an RF connector with a first RF port, a second RF port, a third RF port, and a switch. The switch is used to switch the connectivity between the first RF port, the second RF port, and the third RF port. Specifically, the first RF port is a signal input port, and the second and third RF ports are signal output ports. The first and second RF ports are connected by default. When the RF test cable is inserted into the RF connector, the switch disconnects the first and second RF ports and connects the first and third RF ports.

[0014] The utility model discloses a power noise test system for double radio frequency antenna product, which belongs to the technical field of radio frequency antenna product testing, and relates to a power noise test system for double radio frequency antenna product, which comprises a radio frequency signal source, a radio frequency connector, a first radio frequency port, a second radio frequency port, a third radio frequency port, a first antenna, a second antenna and a radio frequency test line.

[0015] The power noise test system as described above, further, the first antenna is a PCB antenna or a patch antenna or a spring antenna.

[0016] The power noise test system as described above, further, the double radio frequency antenna product has a first radio frequency working mode and a second radio frequency working mode; in the first radio frequency working mode, the radio frequency signal source is connected with the first radio frequency port, the first antenna is connected with the second radio frequency port, the first radio frequency port and the second radio frequency port are connected, and the first radio frequency port and the third radio frequency port are disconnected; the working path of the first radio frequency working mode is radio frequency signal source-radio frequency connector-first antenna; in the second radio frequency working mode, the radio frequency signal source is connected with the first radio frequency port, the second antenna is connected with the third radio frequency port through the radio frequency signal line, the connection between the first radio frequency port and the second radio frequency port is disconnected, and the first radio frequency port and the third radio frequency port are connected; the working path of the second radio frequency working mode is radio frequency signal source-radio frequency connector-radio frequency test line-second antenna.

[0017] The power supply noise test system as described above, further comprising a first power supply noise test mode and a second power supply noise test mode; in the first power supply noise test mode, the first antenna is connected with the first radio frequency port, the radio frequency test line is connected with the third radio frequency port, the radio frequency test line is connected with the low noise amplifier through a feeder, the first radio frequency port is disconnected with the second radio frequency port, and the first radio frequency port is connected with the third radio frequency port; the working path of the first power supply noise test mode is: first antenna→radio frequency connector→radio frequency test line→power supply noise test analysis unit; in the second power supply noise test mode, the second antenna is connected with the radio frequency test line, and the radio frequency test line is connected with the low noise amplifier through a feeder; the working path of the second power supply noise test mode is: second antenna→radio frequency test line→power supply noise test analysis unit; or the near-field probe is connected with the low noise amplifier through a feeder; the working path of the second power supply noise test mode is: near-field probe→power supply noise test analysis unit. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 The structural block diagram of the power supply noise test system of the embodiments of the present application;

[0020] Figure 2 The structural block diagram of the power supply noise test system of the embodiments of the present application;

[0021] Figure 3 The working path schematic diagram of the first radio frequency working mode of the product to be tested;

[0022] Figure 4 The radio frequency port connection schematic diagram of the radio frequency connector in the first radio frequency working mode of the product to be tested;

[0023] Figure 5 The working path schematic diagram of the second radio frequency working mode of the product to be tested;

[0024] Figure 6 The radio frequency port connection schematic diagram of the radio frequency connector in the second radio frequency working mode of the product to be tested;

[0025] Figure 7 The working path schematic diagram of the first power supply noise test mode of the embodiments of the present application;

[0026] Figure 8 Figure 1 is a schematic diagram of a radio frequency connector according to an embodiment of the present application;

[0027] Figure 9 Figure 2 is a schematic diagram of a working path of a second power noise test mode according to an embodiment of the present application.

[0028] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The present application will be described in detail below with reference to the accompanying drawings. In the detailed description of the embodiments of the present application, the drawings will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. It should be noted that the drawings are simplified and all use non-precise proportions, only to facilitate, clearly assist in explaining the purpose of the embodiments of the present application. At the same time, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features; the terms "positive", "negative", "bottom", "upper", "lower" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application.

[0030] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements, it can be wireless connection, or it can be wired connection. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] As shown in Figure 1 and Figure 2 The power noise test system of the present embodiment includes a first antenna 1, a second antenna 2, a near-field probe 3, a low-noise amplifier 4, an attenuator 5 and a spectrum analyzer 6. Among them, the first antenna 1 is an antenna built in the measured product, and the first antenna 1 can be integrated on the circuit board of the measured product Figure 1The components in the middle dashed line box are components disposed on the circuit board. The second antenna 2 is an external antenna, and the second antenna 2 is disposed outside the shell of the product under test. The first antenna 1 and the second antenna 2 are both radio frequency antennas, and their roles in the product under test are to emit radio frequency signals generated by a radio frequency signal source. Specifically, the first antenna 1 can be a PCB antenna, a patch antenna, a spring antenna, or other antennas that can be built into the product under test.

[0032] The first antenna 1 of the embodiment is connected with the radio frequency connector 7 disposed on the circuit board, and the second antenna 2 is connected with the radio frequency connector 7 through the radio frequency test line 9. The radio frequency test line 9 and the near-field probe 3 are connected with the low-noise amplifier 4 through the feed line 11. The low-noise amplifier 4 is connected with the attenuator 5 through the coaxial connection line 12, and the attenuator 5 is connected with the spectrum analyzer 6. The low-noise amplifier 4, the attenuator 5, and the spectrum analyzer 6 form the power supply noise test and analysis unit 10. In specific applications, the power supply noise test and analysis unit 10 can also include power amplification modules, filtering modules, and other devices for signal processing.

[0033] The radio frequency connector 7 of the embodiment is a radio frequency connector with three radio frequency ports (a first radio frequency port 7a, a second radio frequency port 7b, and a third radio frequency port 7c), and has a switching switch, such as a spring switch, inside for switching the connection relationship between different radio frequency ports. Among the three radio frequency ports of the radio frequency connector 7, the first radio frequency port 7a is a signal input port, and the second radio frequency port 7b and the third radio frequency port 7c are signal output ports. The first radio frequency port 7a and the second radio frequency port 7b are connected by default, and when the radio frequency test line 9 is inserted into the radio frequency connector 7, it will touch the switching switch inside the radio frequency connector 7, causing the connection between the first radio frequency port 7a and the second radio frequency port 7b to be disconnected, and automatically switching to connect the first radio frequency port 7a and the third radio frequency port 7c, and the radio frequency test line 9 is connected to the third radio frequency port 7c. With this structure of the radio frequency connector, the switching between the external radio frequency antenna and the built-in radio frequency antenna can be achieved simply and quickly by inserting the radio frequency test line 9. In specific applications, the radio frequency connector 7 can use the ECT third-generation RF radio frequency test seat ECT8180 1998.

[0034] The circuit board of the product under test is further provided with a radio frequency signal source 8, which can be located on the same circuit board as the radio frequency connector 7 or on different circuit boards. The radio frequency signal generated by the radio frequency signal source 8 is transmitted through the first antenna 1 or the second antenna 2. Among them, the radio frequency signal source 8→ the radio frequency connector 7→ the first antenna 1 is the first radio frequency working path of the product under test. The radio frequency signal source 8→ the radio frequency connector 7→ the radio frequency test line 9→ the second antenna 2 is the second radio frequency working path of the product under test. In the radio frequency working mode, the radio frequency signal generated by the radio frequency signal source 8 can be input through the first radio frequency port 7a and output from the second radio frequency port 7b and transmitted by the first antenna 1, or the radio frequency signal generated by the radio frequency signal source 8 can be input through the first radio frequency port 7a and output from the third radio frequency port 7c and transmitted by the second antenna 2.

[0035] In the prior art, the built-in antenna and the external antenna of the product under test are usually switched by a radio frequency switch or a reserved short-circuit zero-ohm resistor. The radio frequency switch needs to be controlled by software, which is relatively complex. The short-circuit zero-ohm resistor is not suitable for large-scale modification of products, and therefore has low flexibility and production feasibility. The radio frequency connector of the utility model adopts three radio frequency ports and can automatically switch the connection relationship of the radio frequency ports through the insertion of the radio frequency test line, so that the switching of the antenna is simpler and the flexibility of switching the built-in antenna and the external antenna of the product under test is improved.

[0036] Referring to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , two radio frequency working modes of the product under test are described.

[0037] As shown in Figure 2 , Figure 3 and Figure 4 , the working path of the first radio frequency working mode is: radio frequency signal source 8→ radio frequency connector 7→ first antenna 1. In this radio frequency working mode, the radio frequency signal source 8 is connected with the first radio frequency port 7a of the radio frequency connector 7, the radio frequency signal source 8 inputs the radio frequency signal through the impedance line on the circuit board, the first radio frequency port 7a and the second radio frequency port 7b are connected by default, the first antenna 1 is connected with the second radio frequency port 7b of the radio frequency connector 7, the radio frequency signal is output from the second radio frequency port 7b, and the built-in first antenna 1 sends the radio frequency signal outward in the form of electromagnetic waves.

[0038] As shown in Figure 2 , Figure 5 and Figure 6As shown, the working path of the second radio frequency working mode is: the radio frequency signal source 8→ the radio frequency connector 7→ the radio frequency test line 9→ the second antenna 2. In the radio frequency working mode, the first radio frequency port 7a of the radio frequency connector 7 is connected with the radio frequency signal source 8, the radio frequency signal source 8 inputs the radio frequency signal into the first radio frequency port 7a through the impedance line on the circuit board, and the second antenna 2 is connected with the radio frequency test line 9 and the third radio frequency port 7c of the radio frequency connector 7. When the radio frequency test line 9 is connected, the connection between the first radio frequency port 7a and the second radio frequency port 7b of the radio frequency connector 7 is disconnected, and the first radio frequency port 7a and the third radio frequency port 7c are connected, the radio frequency signal is output from the third radio frequency port 7c, the second antenna 2 sends the radio frequency signal outward in the form of electromagnetic waves, and the flexible switching of the built-in antenna and the external antenna is realized.

[0039] The test system has two power supply noise test paths, wherein the first antenna 1→ the radio frequency connector 7→ the radio frequency test line 9→ the feeder 11→ the low-noise amplifier 4→ the coaxial connecting line 12→ the attenuator 5→ the spectrum analyzer 6 is a first power supply noise test path.

[0040] The utility model discloses a test system for power supply noise, which comprises a first antenna 1, a radio frequency connector 7, a radio frequency test line 9, a feeder 11, a low-noise amplifier 4, a coaxial connecting line 12, an attenuator 5 and a spectrum analyzer 6.

[0041] Referring to Figure 2 、 Figure 7 、 Figure 8 and Figure 9 , the power supply noise test system can realize the following two power supply noise test modes: a first power supply noise test mode and a second power supply noise test mode.

[0042] As shown in Figure 2 、 Figure 7 and Figure 8As shown, the working path of the first power noise test mode is: the first antenna 1→the radio frequency connector 7→the radio frequency test line 9→the power noise test analysis unit 10.In this working mode, since the radio frequency test line 9 is inserted into the radio frequency connector 7, the first radio frequency port 7a and the second radio frequency port 7b of the radio frequency connector 7 are disconnected, and the first radio frequency port 7a and the third radio frequency port 7c are connected, since the first radio frequency port 7a is a signal input port, at this time, only the radio frequency connector 7 needs to be turned on the circuit board to make the first radio frequency port 7a and the first antenna 1 connected.The noise generated by the power supply is received by the first antenna 1 and connected to the low noise amplifier 4 through the radio frequency test line 9 and the feeder 11, and the low noise amplifier 4 amplifies the weak power noise signal received by the first antenna 1 and transmits it to the attenuator 5 and the spectrum analyzer 6, realizing the image power noise analysis, and the attenuator 5 is used to prevent the noise power from being too large to damage the spectrum analyzer 6.The first power noise test mode directly uses the first antenna 1 built-in the product to be tested for power noise detection, which not only simplifies the system structure, saves space and reduces the test cost, but also can accurately locate the power noise that the radio frequency working frequency band is easily accepted by the built-in antenna, and has high accuracy and sensitivity.

[0043] As shown in Figure 2 and Figure 9 As shown, the working path of the second power noise test mode is: the second antenna 2 or the near-field probe 3→the power noise test analysis unit 10.In this working mode, the second antenna 2 or the near-field probe 3 receives the noise signal generated by the power supply of the product to be tested, and is connected to the low noise amplifier 4 through the feeder 12, and the noise signal is amplified by the low noise amplifier 4 and transmitted to the attenuator 5 and the spectrum analyzer 6, realizing the image power noise analysis, and is suitable for radio frequency power weak noise analysis.Using external antennas or near-field probes meets the richness of power noise detection, built-in antennas analyze power noise for radio frequency fixed working frequency band, external antennas or near-field probes can detect power noise at other frequency points that need to be analyzed, and by matching full-band antennas or omnidirectional antennas, the entire noise affecting frequency band and the power noise affecting each direction of the radio frequency product can also be detected.

[0044] The utility model skillfully utilizes the first antenna built-in the product and the radio frequency connector with multiple automatic switching communication relations, which can realize arbitrary switching of different antennas in the radio frequency working mode, and can use different antennas for power noise detection of the local or external part of the product to be tested and the radio frequency band and full-band in the noise test mode.The built-in antenna has the advantages of simple structure, space saving and low cost, and the external antenna can meet the different needs of antennas in various application occasions, and by matching the radio frequency connecting line, the built-in antenna can be directly switched to the external antenna, and the two do not conflict with each other, and have high flexibility.

[0045] The utility model discloses a spectrum analyzer realizes antenna noise's spectrum graphical analysis, relative to traditional test probe oscillograph's method, more suitable for radio frequency power weak noise analysis.

[0046] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the utility model. Various modifications to these embodiments will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the utility model is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply noise testing system for testing the power supply noise of products with radio frequency antennas, characterized in that, The utility model relates to a kind of power supply noise test device, including: First antenna, the first antenna is built into the product to be measured and is integrated on the circuit board of the product to be measured, the radio frequency connector is provided on the circuit board, and the first antenna is connected with the radio frequency connector; Second antenna, the second antenna is located outside the shell of the product to be measured, and the second antenna is connected with the radio frequency connector through the radio frequency test line, and the first antenna and the second antenna are both radio frequency antennas; Near-field probe; Power supply noise test analysis unit, the power supply noise test analysis unit includes low-noise amplifier, attenuator and spectrum analyzer connected in sequence;The radio frequency test line and the near-field probe are connected with the low-noise amplifier through the feeder.

2. The power supply noise test system of claim 1, wherein: The radio frequency connector has a first radio frequency port, a second radio frequency port, a third radio frequency port and a switching switch, and the switching switch is used to switch the communication relationship between the first radio frequency port, the second radio frequency port and the third radio frequency port; The first radio frequency port is a signal input port, and the second radio frequency port and the third radio frequency port are signal output ports, and the first radio frequency port and the second radio frequency port are connected by default, and when the radio frequency test line is inserted into the radio frequency connector, the connection between the first radio frequency port and the second radio frequency port is disconnected by the switching switch, and the first radio frequency port and the third radio frequency port are connected.

3. The power supply noise test system of claim 1, wherein: The first antenna is a PCB antenna or a patch antenna or a spring antenna.

4. The power supply noise test system of claim 2, wherein: The circuit board of the product to be measured is provided with a radio frequency signal source, and the product to be measured has a first radio frequency operating mode and a second radio frequency operating mode; In the first radio frequency operating mode, the radio frequency signal source is connected with the first radio frequency port, the first antenna is connected with the second radio frequency port, the first radio frequency port and the second radio frequency port are connected, and the first radio frequency port and the third radio frequency port are disconnected;The working path of the first radio frequency operating mode is: radio frequency signal source→radio frequency connector→first antenna; In the second radio frequency operating mode, the radio frequency signal source is connected with the first radio frequency port, the second antenna is connected with the third radio frequency port through the radio frequency signal line, the connection between the first radio frequency port and the second radio frequency port is disconnected, and the first radio frequency port and the third radio frequency port are connected;The working path of the second radio frequency operating mode is: radio frequency signal source→radio frequency connector→radio frequency test line→second antenna.

5. The power supply noise test system of claim 2, wherein: It includes a first power supply noise test mode and a second power supply noise test mode; In the first power supply noise test mode, the first antenna is connected with the first radio frequency port, the radio frequency test line is connected with the third radio frequency port, the radio frequency test line is connected with the low-noise amplifier through the feeder, the connection between the first radio frequency port and the second radio frequency port is disconnected, the first radio frequency port and the third radio frequency port are connected, and the working path of the first power supply noise test mode is: first antenna→radio frequency connector→radio frequency test line→power supply noise test analysis unit. In the second power supply noise test mode, the second antenna is connected with the radio frequency test line, and the radio frequency test line is connected with the low noise amplifier through a feeder; and a working path of the second power supply noise test mode is: second antenna→radio frequency test line→power supply noise test analysis unit.

6. A system for power supply noise testing of a dual radio frequency antenna product, characterized by: The double radio frequency antenna product comprises a shell, a first antenna, a second antenna, a radio frequency connector, a radio frequency signal source and a circuit board. The first antenna is connected with the radio frequency connector through a circuit on the circuit board, and the second antenna is connected with the radio frequency connector through a radio frequency test line. The power supply noise test system comprises the first antenna, the second antenna, a near field probe and a power supply noise test analysis unit.

7. The power supply noise test system of claim 6, wherein: The radio frequency connector has a first radio frequency port, a second radio frequency port, a third radio frequency port and a switching switch.

8. The power supply noise test system of claim 6, wherein: The first antenna is a PCB antenna or a patch antenna or a spring antenna.

9. The power supply noise test system of claim 7, wherein: The double radio frequency antenna product has a first radio frequency working mode and a second radio frequency working mode. In the first radio frequency working mode, the radio frequency signal source is connected with the first radio frequency port, the first antenna is connected with the second radio frequency port, the first radio frequency port and the second radio frequency port are connected, and the first radio frequency port and the third radio frequency port are disconnected; and a working path of the first radio frequency working mode is: radio frequency signal source→radio frequency connector→first antenna. In the second radio frequency working mode, the radio frequency signal source is connected with the first radio frequency port, the second antenna is connected with the third radio frequency port through a radio frequency signal line, the first radio frequency port and the second radio frequency port are disconnected, and the first radio frequency port and the third radio frequency port are connected; and a working path of the second radio frequency working mode is: radio frequency signal source→radio frequency connector→radio frequency test line→second antenna.

10. The power supply noise test system of claim 7, wherein: The power supply noise test system comprises the first antenna, the second antenna, a near field probe and a power supply noise test analysis unit. In the first power supply noise test mode, the first antenna is connected with the first radio frequency port, the radio frequency test line is connected with the third radio frequency port, the radio frequency test line is connected with the low noise amplifier through a feeder, the first radio frequency port and the second radio frequency port are disconnected, the first radio frequency port and the third radio frequency port are connected, and a working path of the first power supply noise test mode is: first antenna→radio frequency connector→radio frequency test line→power supply noise test analysis unit. In the second power supply noise test mode, the second antenna is connected with the radio frequency test line, the radio frequency test line is connected with the low noise amplifier through the feeder, and a working path of the second power supply noise test mode is: the second antenna→the radio frequency test line→the power supply noise test analysis unit; or the near-field probe is connected with the low noise amplifier through the feeder, and the working path of the second power supply noise test mode is: the near-field probe→the power supply noise test analysis unit.

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