Superposition intermodulation test system
By designing a superimposed intermodulation test system, the problem of traditional intermodulation devices being unable to test the superposition of multiple frequency signals was solved, thus achieving efficient and stable communication services.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-21
- Publication Date
- 2026-03-10
AI Technical Summary
Traditional intermodulation devices struggle to test intermodulation parameters when multiple frequency signals are superimposed, and cannot accurately simulate and measure the complex interactions between multiple frequency signals.
Design a superposition intermodulation test system, including a PC communication terminal, a signal source group, a spectrum analyzer, a power meter, a multi-channel carrier intermodulation module and a traditional intermodulation module. By combining the multi-channel carrier intermodulation module and the traditional intermodulation module, superposition intermodulation testing of multiple frequency signals can be achieved.
It improves communication efficiency, enhances signal transmission quality, and reduces costs, providing efficient, stable, and reliable communication services for modern communication systems.
Smart Images
Figure CN223987105U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of superposition intermodulation technology, and specifically relates to a superposition intermodulation testing system. Background Technology
[0002] Traditional intermodulation devices (IMDs) are largely based on testing single or a few specific frequency signals. The reason they struggle to test superimposed intermodulation parameters is that their testing principles and methods primarily rely on detecting single or a few specific frequency signals. In practice, the common approach is to input two signals of different frequencies into the device under test (DUT) and then measure the resulting intermodulation products. However, this method falls short when faced with multiple frequency signals superimposed and generating intermodulation. It cannot simultaneously and accurately simulate and measure the complex interactions between multiple frequency signals. Utility Model Content
[0003] Purpose of the utility model: To provide a superposition intermodulation test system that solves the above-mentioned problems existing in the prior art.
[0004] Technical Solution: A superposition intermodulation test system includes a PC communication terminal, which is communicatively connected to a signal source group, a spectrum analyzer, a power meter, a multi-channel carrier intermodulation module, and a traditional intermodulation module. The output terminal of the signal source group is simultaneously connected to the input terminal of the multi-channel carrier intermodulation module and the input terminal of the traditional intermodulation module. The input terminal of the spectrum analyzer is connected to the output terminal of the traditional intermodulation module, and the input terminal of the power meter is connected to the output terminal of the traditional intermodulation module. The output terminal of the multi-channel carrier intermodulation module is connected to an antenna port intermodulation point, and the antenna port intermodulation point is connected to the input terminal of the traditional intermodulation module. The output terminal of the multi-channel carrier intermodulation module is connected to the RX channel of the traditional intermodulation module through an R-band port.
[0005] Preferably, the multi-channel carrier intermodulation module includes a first group of 1-to-8 combiners and a second group of 1-to-8 combiners. The input terminal of the first group of 1-to-8 combiners is connected to the output terminal of the signal source group. The output terminals of the first group of 1-to-8 combiners are respectively connected to the input terminals of attenuators. The output terminal of each group of attenuators is respectively connected to the IN1 input terminal of each group of dual-channel power amplifiers. The OUT1 output terminal of each group of dual-channel power amplifiers is connected to the input terminal of each group of 1-to-2 combiners. The output terminal of the 1-to-2 combiner is connected to the antenna under test. The input terminal of the second group of 1-to-8 combiners is connected to the output terminal of the signal source group. The output terminal of the second group of 1-to-8 combiners is respectively connected to the input terminal of attenuators. The output terminal of each group of attenuators is respectively connected to the IN2 input terminal of each group of dual-channel power amplifiers. The OUT2 output terminal of each group of dual-channel power amplifiers is connected to the input terminal of each group of 1-to-2 combiners. The output terminal of the 1-to-2 combiner is connected to the antenna under test.
[0006] Preferably, the conventional intermodulation module includes a switch matrix, which controls the output and input terminals of the spectrum analyzer, the output and input terminals of the power meter, the output and input terminals of the power amplifier, and the power output and power input terminals of the passive module. The port1 and port2 ports of the passive module are respectively connected to the ANT port of the antenna under test through low intermodulation cables.
[0007] Preferably, the low-frequency port of the antenna under test has a frequency range of 698-960MHz, the mid-low frequency port has a frequency range of 2300-2690MHz, and the high-frequency port has a frequency range of 3300-3800MHz.
[0008] Preferably, the spectrum analyzer is an N9010B model spectrum analyzer, and the power meter is an N1912A model power meter.
[0009] Preferably, the 1-to-8 combiner is an NTSP-1X8 1-to-8 combiner, the dual-channel power amplifier is an NTPIMPA-3338 dual-channel power amplifier, and the 1-to-2 combiner is an NTSP-1X8 1-to-2 combiner.
[0010] Preferably, the switch matrix is an NTDPDT-4X20 model switch matrix.
[0011] Beneficial Effects: This utility model relates to a superposition intermodulation test system. A multi-channel carrier intermodulation module has one output with a carrier power of 3310MHz and another with a carrier power of 3740MHz, generating a third-order intermodulation frequency of 712MHz. The intermodulation signal is transmitted through the R-band port to the RX channel of the passive module in a traditional intermodulation module for intermodulation analysis. In the traditional intermodulation module, the passive module is connected to the 600-2700MHz R-band port of the multi-channel carrier intermodulation module. T3 has a carrier power of 728MHz, and T4 has a carrier power of 744MHz, generating a third-order intermodulation frequency of 712MHz. This signal passes through the RX channel of the passive module, and the intermodulation result of the superposition of the two 712MHz intermodulation frequencies can be analyzed using a spectrum analyzer. This not only improves communication efficiency and enhances signal transmission quality but also reduces costs, providing efficient, stable, and reliable communication services for modern communication systems. Attached Figure Description
[0012] Figure 1 This is a system block diagram of the present invention;
[0013] Figure 2 This is a comparison table of test data for this utility model;
[0014] Figure 3 This is a system block diagram of the multi-channel carrier intermodulation module of this utility model;
[0015] Figure 4 This is a block diagram of the conventional intermodulation module system of this utility model. Detailed Implementation
[0016] like Figures 1 to 4As shown, this utility model provides a technical solution: a superposition intermodulation test system, including a PC communication terminal. The PC communication terminal is communicatively connected to a signal source group, a spectrum analyzer, a power meter, a multi-channel carrier intermodulation module, and a traditional intermodulation module. The signal source group, spectrum analyzer, and power meter constitute an instrument subsystem. The spectrum analyzer is an N9010B model, and the power meter is an N1912A model. The multi-channel carrier intermodulation module includes a first set of 1-to-8 combiners and a second set of 1-to-8 combiners. The 1-to-8 combiners are NTSP-1X8 model 1-to-8 combiners. The dual-channel power amplifier is an NTPIMPA-3338 model, and the 1-to-2 combiner is an NTSP-1X8 model. The input of the first 1-to-8 combiner is connected to the output of the signal source group. The output of the first 1-to-8 combiner is connected to the input of the attenuator. The output of each attenuator is connected to the IN1 input of each dual-channel power amplifier. The OUT1 output of each dual-channel power amplifier is connected to the input of each 1-to-2 combiner. The output of the 1-to-2 combiner is connected to the antenna under test. The second 1-to-8 combiner... The input terminal of the circuit is connected to the output terminal of the signal source group. The output terminals of the second group of 1-to-8 combiners are respectively connected to the input terminals of the attenuators. The output terminal of each group of attenuators is respectively connected to the IN2 input terminal of each group of dual-channel power amplifiers. The OUT2 output terminal of each group of dual-channel power amplifiers is connected to the input terminal of each group of 1-to-2 combiners. The output terminal of the 1-to-2 combiner is connected to the ANT port of the antenna under test. The conventional intermodulation module includes a switch matrix. The switch matrix adopts the NTDPDT-4X20 model switch matrix. The switch matrix controls the output and input terminals of the spectrum analyzer, the output terminal of the power meter, and the... The input terminal, the output terminal and the input terminal of the power amplifier, and the power output terminal and the power input terminal of the passive module are provided. The port1 and port2 of the passive module are connected to the ANT port of the antenna under test through low intermodulation cables. That is, when one output terminal of the multi-channel carrier intermodulation module has a carrier power of 3310MHz as the first carrier, denoted as T1, and the other output terminal has a carrier power of 3740MHz as the second carrier, denoted as T2, a third-order intermodulation frequency of 712MHz is generated. The intermodulation signal is transmitted to the RX channel of the passive module in the traditional intermodulation module for intermodulation analysis through the R-band port.In traditional intermodulation modules, passive modules connect to the R-band ports of multi-channel carrier intermodulation modules in the 600-2700MHz range. These passive modules are passive chassis components consisting of a synthesizer and a fixed-frequency, low-intermodulation duplexer. The type of passive module is typically combined according to the system's frequency band requirements. One passive module supports one test frequency band. T3 and T4 are the source signals emitted by the passive modules in the traditional intermodulation module. Passive modules at 700MHz, 800MHz, 900MHz, 1800MHz, 2100MHz, and 2600MHz can all emit the power of T3 and T4, only at different frequencies. In this embodiment, T3 uses a 728MHz carrier power, and T4 uses a 744MHz carrier power, generating a third-order intermodulation frequency of 712MHz. Passing through the RX channel of the passive module, the intermodulation result of the two 712MHz intermodulation frequencies can be analyzed using a spectrum analyzer. This not only improves communication efficiency and enhances signal transmission quality but also reduces costs, providing efficient, stable, and reliable communication services for modern communication systems.
[0017] In a further embodiment, the frequency range of the low-frequency port of the antenna under test is 698-960MHz, the frequency range of the mid-low frequency port is 2300-2690MHz, and the frequency range of the high-mid frequency port is 3300-3800MHz.
[0018] Through the above technical solution, the present invention can achieve the following working process:
[0019] Signal source 101 in the signal source group is transmitted to the octet-to-one converter 201 of the multi-channel carrier intermodulation module, signal source 102 is transmitted to the octet-to-one converter 202 of the multi-channel carrier intermodulation module, signal source 103 is transmitted to the input signal F3 in the traditional intermodulation module, and signal source 104 is transmitted to the input signal F4 in the traditional intermodulation module. The generated intermodulation frequency points fall on the corresponding interfaces of the R&Y of the corresponding 3338 cross-intermodulation system. The superposition intermodulation between the systems can be tested by interconnecting the corresponding frequency band module port of the traditional intermodulation module with the corresponding interface of the R&Y of the 3338 cross-intermodulation system.
[0020] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.
Claims
1. An overlay intermodulation test system characterized by, The PC communication end is connected with a signal source group, a spectrum analyzer, a power meter, a multi-channel carrier intermodulation module and a traditional intermodulation module.
2. An overlay intermodulation test system according to claim 1, wherein, The multi-channel carrier intermodulation module comprises a first group of one-to-eight hybrid couplers and a second group of one-to-eight hybrid couplers.
3. An overlay intermodulation test system according to claim 1, wherein, The traditional intermodulation module comprises a switch matrix.
4. An overlay intermodulation test system according to claim 3, wherein, The low-frequency port of the measured antenna has a frequency range of 698-960 MHz, the medium-low-frequency port has a frequency range of 2300-2690 MHz, and the high-frequency port has a frequency range of 3300-3800 MHz.
5. The overlay intermodulation test system of claim 1, wherein, The spectrum analyzer is of Model N9010B, and the power meter is of Model N1912A.
6. An overlay intermodulation test system according to claim 2, wherein, The one-to-eight hybrid coupler is of Model NTSP-1X8, the double-channel power amplifier is of Model NTPIMPA-3338, and the one-to-two hybrid coupler is of Model NTSP-1X8.
7. An overlay intermodulation test system according to claim 3, wherein, The switch matrix is of Model NTDPDT-4X20.