Controllable radiation type cross modulation and mutual interference product generation microstrip antenna array and design method

Abstract

The invention discloses a controllable radiation type cross modulation and mutual interference product generation microstrip antenna array and a design method. The controllable radiation type cross modulation and mutual interference product generation microstrip antenna array comprises a power divider, a plurality of patch antennas and a cross modulation signal generation module, the input end of each patch antenna is connected to one output end of the power divider, each patch antenna is correspondingly provided with one cross modulation signal generation module, and the output end of each cross modulation signal generation module is connected with the input end of the corresponding patch antenna. The controllable radiation type cross modulation and mutual interference product generation microstrip antenna array is simple in circuit structure, production cost is reduced, in addition, non-linear spread spectrum is achieved by means of new harmonic frequency generated by the intermodulation phenomenon, the channel capacity of a wireless communication system is effectively improved, linear wave beams are not interfered to be generated, and meanwhile the antenna array can be applied to the wireless communication system. And the direction of a nonlinear wave beam generated by cross modulation and mutual interference is accurately controlled, so that the performance of a wireless communication system is optimized.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a controllable radiation type intermodulation interference product generation microstrip antenna array and a design method thereof. Background Art

[0002] Intermodulation distortion (IM) is a common signal distortion phenomenon in high-power wireless communication systems, primarily caused by nonlinear effects within the system. This problem has long been a major challenge in high-power antenna design. With the advancement of wireless communication technology, effectively increasing channel capacity has become a hot topic of research.

[0003] Currently, existing research on antenna arrays mainly focuses on the measurement and control of conductive IM products. There are many methods to achieve controllable IM products through circuit design. Although the traditional circuit structure for achieving controllable IM products can achieve nonlinear spread spectrum, its structure is complex, resulting in high cost, and the channel capacity of wireless communication systems still needs to be improved.

[0004] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a controllable radiating intermodulation interference product generating microstrip antenna array and design method, so as to address the problems in the prior art that, although the traditional circuit structure for realizing controllable IM products can achieve nonlinear spread spectrum, it has a complex structure, resulting in high cost, and the channel capacity of the wireless communication system still needs to be improved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: providing a controllable radiation type intermodulation interference product generation microstrip antenna array, including: a power divider, a plurality of patch antennas and an intermodulation signal generation module;

[0007] The power splitter is used to access the radio frequency signal and perform power distribution;

[0008] The input end of each patch antenna is connected to an output end of the power divider, and each patch antenna is correspondingly provided with an intermodulation signal generating module. The output end of each intermodulation signal generating module is connected to the input end of the corresponding patch antenna. The intermodulation signal generating module is used to receive the output signal of the power divider and generate an intermodulation signal after receiving the excitation signal. The patch antenna is used to receive the output signal of the power divider and radiate the intermodulation signal output by the corresponding intermodulation signal generating module.

[0009] According to a further configuration of the present invention, the number of output ports of the power divider is equal to the number of the patch antennas.

[0010] According to a further configuration of the present invention, the power splitter is an equal-dividing power splitter.

[0011] According to a further configuration of the present invention, the intermodulation signal generating module is a third-order intermodulation signal generating circuit, and each patch antenna is correspondingly provided with a third-order intermodulation signal generating circuit, and the output end of the third-order intermodulation signal generating circuit is connected to the power divider and the input end of the corresponding patch antenna.

[0012] According to a further configuration of the present invention, the excitation signal is a DC bias voltage signal.

[0013] According to a further configuration of the present invention, the controllable radiation type intermodulation interference product generating microstrip antenna array further includes: a DC bias voltage output module connected to the intermodulation signal generating module, for outputting a DC bias voltage signal to the intermodulation signal generating module.

[0014] The present invention also provides a design method for the controllable radiation type intermodulation interference product generation microstrip antenna array as described above, the design method comprising:

[0015] Determining the number of patch antennas, and determining a power divider according to the number of the patch antennas, wherein a plurality of patch antennas are provided, and an input end of each patch antenna is connected to an output end of the power divider;

[0016] An intermodulation signal generating module is provided according to the number of the patch antennas. One intermodulation signal generating module is provided for each patch antenna, and an output end of the intermodulation signal generating module is connected to an input end of the corresponding patch antenna.

[0017] According to a further configuration of the present invention, the number of output ports of the power divider is equal to the number of the patch antennas.

[0018] According to a further configuration of the present invention, the power splitter is an equal-dividing power splitter.

[0019] According to a further configuration of the present invention, the intermodulation signal generating module includes a third-order intermodulation signal generating circuit, and each patch antenna is provided with a corresponding third-order intermodulation signal generating circuit, and the output end of the third-order intermodulation signal generating circuit is connected to the power divider and the input end of the corresponding patch antenna.

[0020] The beneficial effects of the present invention are:

[0021] The present invention discloses a controllable radiating intermodulation and mutual interference product generating microstrip antenna array and a design method. The controllable radiating intermodulation and mutual interference product generating microstrip antenna array comprises: a power divider, a plurality of patch antennas and an intermodulation signal generating module; the input end of each patch antenna is connected to an output end of the power divider, and each patch antenna is correspondingly provided with an intermodulation signal generating module, the output end of each intermodulation signal generating module is connected to the input end of the corresponding patch antenna, the intermodulation signal generating module is used to receive the output signal of the power divider and generate an intermodulation signal after receiving an excitation signal, and the patch antenna is used to receive the output signal of the power divider and radiate the intermodulation signal output by the corresponding intermodulation signal generating module. The circuit structure of the controllable radiation-type intermodulation and mutual interference product generation microstrip antenna array is simple, which reduces production costs. In addition, the new harmonic frequencies generated by the intermodulation phenomenon are used to achieve nonlinear spectrum spread, effectively improving the channel capacity of the wireless communication system. Each patch antenna is correspondingly connected to the output port of a power divider and an intermodulation signal generation module, so that the direction of the nonlinear beam generated by the intermodulation and mutual interference is accurately controlled without interfering with the generation of linear beams, thereby optimizing the performance of the wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 This is a circuit structure diagram of a controllable radiation type intermodulation interference product generation microstrip antenna array according to the present invention.

[0024] Figure 2 The present invention is a flowchart for verifying the controllable radiation type intermodulation interference product generation microstrip antenna array in one embodiment of the present invention.

[0025] Figure 3 The present invention is a flow chart of a design method for a controllable radiation type intermodulation interference product generation microstrip antenna array.

[0026] Reference numerals in the accompanying drawings: 10, patch antenna; 20, intermodulation signal generating module; 30, power divider. DETAILED DESCRIPTION

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. They are only for the convenience of describing the technical solution and do not indicate that the devices or components referred to must have specific directions. Therefore, they should not be understood as limiting the present invention.

[0028] Intermodulation distortion (IM) is a common signal distortion phenomenon in high-power wireless communication systems, primarily caused by nonlinear effects within the system. This problem has long been a major challenge in high-power antenna design. With the advancement of wireless communication technology, effectively increasing channel capacity has become a hot topic of research.

[0029] Currently, existing research on antenna arrays primarily focuses on the measurement and control of conductive intermodulation (IM) products, with numerous methods for achieving controllable IM products through circuit design. For example, patent publication number CN118158039A discloses an antenna structure and method for reducing passive intermodulation (PIM) effects. The structure comprises a helical wire, a multi-hole flange, and a disc-shaped metal ground plane, using back-coaxial feeding. Key technologies include increasing the contact between the flange and the ground plane, increasing the helical wire radius, and adding flange vias. By combining these three techniques, the current density flowing through the helical wire is reduced, while the loop current density between the flange and the metal ground plane is reduced, thereby reducing the PIM (Passive Intermodulation) radiation level of the entire helical antenna. This invention has a wide range of applications, optimizes the antenna structure, and possesses a certain degree of innovation. For another example, patent publication number CN106053534A discloses a broadband, non-contact, passive intermodulation (PIM) test device for coatings based on a transmission line structure. The device comprises a microstrip transmission line, a first low-frequency coaxial connector, a second low-frequency coaxial connector, and a PIM tester. During operation, the microstrip transmission line serves as a carrier for a coated metal motherboard to be tested, which is placed in a dielectric layer. The electromagnetic field generated by the upper conductor excites the coated metal motherboard in the dielectric layer using a non-contact electromagnetic field perturbation method, causing the generated PIM signal to be transmitted to the PIM tester. Numerous studies have been conducted on such conductive IM measurement devices. While conventional circuit structures for implementing controllable IM products can achieve nonlinear spectrum spread, their complex structures lead to high costs, and the channel capacity of wireless communication systems still needs to be improved. In particular, research on how to utilize radiative IM products for communication remains largely unexplored, limiting the potential application of IM in wireless communication systems.

[0030] Based on the above technical issues, such as Figure 1 As shown, the present invention provides a controllable radiating intermodulation and mutual interference product generating microstrip antenna array, which may include a power divider 30, a plurality of patch antennas 10 and an intermodulation signal generating module 20; the power divider 30 is used to access the radio frequency signal and perform power distribution; the input end of each patch antenna 10 is connected to an output end of the power divider 30, and each patch antenna 10 is correspondingly provided with an intermodulation signal generating module 20, the output end of each intermodulation signal generating module 20 is connected to the input end of the corresponding patch antenna 10, the intermodulation signal generating module 20 is used to receive the output signal of the power divider 30 and generate an intermodulation signal after receiving the excitation signal, and the patch antenna 10 is used to receive the output signal of the power divider 30 and radiate the intermodulation signal output by the corresponding intermodulation signal generating module 20.

[0031] Specifically, the patch antenna 10 can be set to a 1×4 microstrip patch antenna 10 array, that is, an array composed of four microstrip patch antennas 10. Correspondingly, the power divider 30 selects a power divider 30 with four output ports, and each output port of the power divider 30 is connected to the input end of a microstrip patch antenna 10; similarly, each microstrip patch antenna 10 is correspondingly provided with an intermodulation signal generating module 20, and the output end of each intermodulation signal generating module 20 is connected to the input end of the corresponding microstrip patch antenna 10, and the input end of the intermodulation signal generating module 20 is connected to the excitation signal.

[0032] Of course, several patch antennas 10 can also form a ring antenna array or a dipole antenna array to achieve nonlinear beam control, which is not limited here.

[0033] In a specific application, the controlled radiation intermodulation and mutual interference product generating microstrip antenna array (also known as frequency generation array, FGA, Frequency Generation Array) receives the output signal of the output end of the power divider 30 and generates an intermodulation signal after the intermodulation signal generating module 20 is connected to the excitation signal. At the same time, the microstrip patch antenna 10 receives the output signal of the output end of the power divider 30 and radiates the corresponding intermodulation signal generated by the intermodulation signal generating module 20.

[0034] In this embodiment, each microstrip patch antenna 10 is provided with an intermodulation signal generation module 20, so that overall intermodulation beam control can be achieved between each microstrip patch antenna 10 and the corresponding intermodulation signal generation module 20. The new harmonic frequencies generated by the intermodulation phenomenon are used to achieve nonlinear spectrum expansion, effectively improving the channel capacity of the wireless communication system. In addition, the direction of the nonlinear beam generated by the intermodulation interference is precisely controlled without interfering with the generation of the linear beam, thereby optimizing the performance of the wireless communication system. It also provides a new perspective for the standardized testing of intermodulation interference and the optimization of nonlinear spectrum. The circuit structure of the controllable radiation type intermodulation interference product generation microstrip antenna array is simple, reducing production costs. In addition, the new harmonic frequencies generated by the intermodulation phenomenon are used to achieve nonlinear spectrum expansion, effectively improving the channel capacity of the wireless communication system. Each patch antenna is correspondingly connected to the output port of a power divider and the intermodulation signal generation module, so that the direction of the nonlinear beam generated by the intermodulation interference is precisely controlled without interfering with the generation of the linear beam, thereby optimizing the performance of the wireless communication system. Of course, it also provides a new perspective for the standardized testing of intermodulation interference and the optimization of nonlinear spectrum.

[0035] In some embodiments, the number of output ports of the power divider 30 is equal to the number of patch antennas 10 .

[0036] Specifically, the number of output ports of the power divider 30 is equal to the number of patch antennas 10, that is, each output port of the power divider 30 can be connected to the input end of a patch antenna 10, wherein the power divider 30 can be set to an equally divided power divider 30.

[0037] In one embodiment, the equal power splitter 30 may be a Wilkinson equal power splitter 30 .

[0038] In some embodiments, the intermodulation signal generating module 20 is a third-order intermodulation signal generating circuit. Each patch antenna 10 is provided with a corresponding third-order intermodulation signal generating circuit, and the output end of the third-order intermodulation signal generating circuit is connected to the power divider 30 and the input end of the corresponding patch antenna 10.

[0039] Specifically, the third-order intermodulation signal generating circuit is any circuit capable of generating a third-order intermodulation signal. For example, after determining a third-order intermodulation signal generating circuit, different types of diodes or circuit topologies can be used based on the third-order intermodulation signal generating circuit to optimize performance or adapt to different operating frequencies. Therefore, the specific circuit structure of the third-order intermodulation signal generating circuit is not limited herein. The third-order intermodulation signal generating circuit is a relatively common circuit structure. Therefore, configuring the intermodulation signal generating module 20 as a third-order intermodulation signal generating circuit can reduce costs.

[0040] Furthermore, the excitation signal is a DC bias voltage signal.

[0041] Specifically, the controllable radiation type intermodulation interference product generating microstrip antenna array also includes a DC bias voltage output module, which is connected to the intermodulation signal generating module 20. The DC bias voltage output module outputs a DC bias voltage signal to the third-order intermodulation signal generating circuit, so that the third-order intermodulation signal generating circuit generates a third-order intermodulation signal, wherein the third-order intermodulation signal serves as the input source of the patch antenna 10, and the patch antenna 10 radiates the third-order intermodulation signal.

[0042] Among them, the amplitude and phase of the third-order intermodulation signal generating circuit can be adjusted by controlling the amplitude and phase of the DC bias voltage signal output by the circuit that generates the DC bias voltage signal, so as to achieve precise control of the nonlinear beam radiation direction at the frequency of the third-order intermodulation signal, and within a specific voltage range, the beam angle of the third-order intermodulation signal can be adjusted independently. At the same time, the 10-frequency beam of the patch antenna is not affected by the nonlinear beam tuning, so that the controllable radiation type intermodulation interference product generating microstrip antenna array remains stable during the entire tuning process.

[0043] In this embodiment, the DC bias voltage output module can be any DC bias voltage output circuit that can achieve the above functions, and no further limitations are given here.

[0044] In a specific embodiment, the third-order intermodulation signal generating circuit is a circuit structure having a Schottky diode, such as Figure 2 As shown, when verifying the controlled radiation type intermodulation and mutual interference product generation microstrip antenna array, the third-order intermodulation signal generation circuit simulation is performed by Advanced Design System (ADS, electronic design automation) software to obtain the amplitude and phase data of the third-order intermodulation signal generated by the Schottky diode under different DC bias voltage signals; further, the amplitude and phase data of the third-order intermodulation signal obtained by the ADS software are input to the input end of the patch antenna 10 of the controlled radiation type intermodulation and mutual interference product generation microstrip antenna array simulated by HFSS (High Frequency Structure Simulator, radio frequency simulation software); ADS software is used to construct a PCB (printed circuit board, Printed Circuit Board) prototype and manufacture a physical controlled radiation type intermodulation and mutual interference product generation microstrip antenna array; finally, performance verification is performed.

[0045] When performing performance verification, the verification includes a transmitting end and a receiving end. The transmitting end includes two signal generators, a synthesizer, a DC power supply, and a controllable radiation type intermodulation and mutual interference product generating microstrip antenna array. The two signal transmitters are connected to the input end of the synthesizer, and the output end of the synthesizer is connected to the input end of the power divider 30. The AC signal generating module in the controllable radiation type intermodulation and mutual interference product generating microstrip antenna array is connected to the DC power supply. The DC power supply outputs a DC bias voltage signal to the intermodulation signal generating module 20, wherein each intermodulation signal generating module 20 is correspondingly provided with a DC power supply. The consistency between the theoretical result and the measurement result is verified by measuring the far-field radiation pattern of the controllable radiation type intermodulation and mutual interference product generating microstrip antenna array; the receiving end is a receiving antenna.

[0046] In this embodiment, one signal generator generates a signal with a frequency of 2620 MHz, and another signal generator generates a signal with a frequency of 2676 MHz, which are synthesized by a synthesizer into a signal containing frequencies of 2620 MHz and 2676 MHz. The combined signal is output to a controllable radiating intermodulation product generating microstrip antenna array, and the controllable radiating intermodulation product generating microstrip antenna array radiates a third-order intermodulation signal with a frequency of 2564 MHz.

[0047] In some embodiments, as Figure 3 As shown, the present invention also provides a design method for the controllable radiation type intermodulation interference product generation microstrip antenna array as described above, the design method comprising the following steps:

[0048] S100, determining the number of patch antennas, and determining a power divider according to the number of patch antennas, wherein a plurality of patch antennas are provided, and an input end of each patch antenna is connected to an output end of the power divider;

[0049] S200 , setting an intermodulation signal generation module according to the number of patch antennas, wherein one intermodulation signal generation module is correspondingly set for each patch antenna, and an output end of the intermodulation signal generation module is connected to an input end of the corresponding patch antenna.

[0050] Specifically, the input of each patch antenna is connected to the output port of the power divider and to an intermodulation signal generation module. The patch antenna can be configured as a 1×4 microstrip patch antenna array, i.e., an array consisting of four microstrip patch antennas. Accordingly, the power divider is a power divider with four output ports, each of which is connected to the input of a microstrip patch antenna. Similarly, each microstrip patch antenna is configured with an intermodulation signal generation module, with the output of each intermodulation signal generation module connected to the input of its corresponding microstrip patch antenna, and the input of the intermodulation signal generation module is connected to the excitation signal.

[0051] In a specific application of the controlled radiation intermodulation and mutual interference product generating microstrip antenna array, after the intermodulation signal generating module is connected to the excitation signal, the intermodulation signal generating module receives the output signal of the output end of the power divider and generates an intermodulation signal. At the same time, the microstrip patch antenna receives the output signal of the output end of the power divider and radiates the intermodulation signal generated by the corresponding intermodulation signal generating module.

[0052] In this embodiment, an intermodulation signal generating module is correspondingly provided for each microstrip patch antenna, and each microstrip patch antenna is correspondingly connected to the output port of a power divider. The circuit structure of the controllable radiation-type intermodulation interference product generating microstrip antenna array designed by this design method is simple, which reduces the production cost. In addition, the new harmonic frequency generated by the intermodulation phenomenon is utilized to realize nonlinear spectrum spreading, effectively improving the channel capacity of the wireless communication system. Each patch antenna is correspondingly connected to the output port of a power divider and the intermodulation signal generating module, so that the direction of the nonlinear beam generated by the intermodulation interference is accurately controlled without interfering with the generation of the linear beam, thereby optimizing the performance of the wireless communication system. Of course, it also provides a new perspective for the standardized testing of intermodulation interference and the optimization of the nonlinear spectrum.

[0053] In some embodiments, the number of output ports of the power divider is equal to the number of patch antennas. Specific details are as described above in the specific embodiment of generating a microstrip antenna array with controllable radiating intermodulation and mutual interference products, and will not be repeated here.

[0054] In some embodiments, the power splitter is an equal-division power splitter. Specific details are as described above in the specific embodiment of the controllable radiation type intermodulation interference product generation microstrip antenna array, which will not be repeated here.

[0055] In some embodiments, the intermodulation signal generation module is a third-order intermodulation signal generation circuit. Each patch antenna is provided with a corresponding third-order intermodulation signal generation circuit, and the output of the third-order intermodulation signal generation circuit is connected to the power divider and the input of the corresponding patch antenna. The specific embodiment of the controllable radiating intermodulation interference product generation microstrip antenna array is described above and will not be repeated here.

[0056] It should be noted that the description of the embodiment of the design method for a controllable radiation type intermodulation and mutual interference product-generating microstrip antenna array is similar to the description of the embodiment of the controllable radiation type intermodulation and mutual interference product-generating microstrip antenna array described above, and has similar beneficial effects as the above-mentioned controllable radiation type intermodulation and mutual interference product-generating microstrip antenna array. For technical details not disclosed in the embodiment of the design method for a controllable radiation type intermodulation and mutual interference product-generating microstrip antenna array, please refer to the description of the embodiment of the controllable radiation type intermodulation and mutual interference product-generating microstrip antenna array of the present invention for understanding.

[0057] In summary, the present invention provides a controllable radiation-type intermodulation interference product generation microstrip antenna array and design method, which has the following beneficial effects:

[0058] The circuit structure of the controllable radiation type intermodulation interference product generation microstrip antenna array is simple, which reduces production costs. In addition, the new harmonic frequency generated by the intermodulation phenomenon is used to realize nonlinear spectrum spread, effectively improving the channel capacity of the wireless communication system. Each patch antenna is connected to the output port of a power divider and the intermodulation signal generation module, so that the direction of the nonlinear beam generated by the intermodulation interference is accurately controlled without interfering with the generation of linear beams, thereby optimizing the performance of the wireless communication system.

[0059] It is understandable that the above embodiments only express the preferred implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, all of which fall within the scope of protection of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of coverage of the claims of the present invention.

Claims

1. A controllable radiation type intermodulation interference product generating microstrip antenna array, characterized in that: include: Power divider, several patch antennas and intermodulation signal generation module; The power splitter is used to access the radio frequency signal and perform power distribution; The input end of each patch antenna is connected to an output end of the power divider, and each patch antenna is correspondingly provided with an intermodulation signal generating module. The output end of each intermodulation signal generating module is connected to the input end of the corresponding patch antenna. The intermodulation signal generating module is used to receive the output signal of the power divider and generate an intermodulation signal after receiving the excitation signal. The patch antenna is used to receive the output signal of the power divider and radiate the intermodulation signal output by the corresponding intermodulation signal generating module.

2. The controllable radiation type intermodulation interference product generating microstrip antenna array according to claim 1, characterized in that: The number of output ports of the power divider is equal to the number of the patch antennas.

3. The controllable radiation type intermodulation interference product generating microstrip antenna array according to claim 2, characterized in that: The power splitter is an equal-dividing power splitter.

4. The controllable radiation type intermodulation interference product generating microstrip antenna array according to claim 1, characterized in that: The intermodulation signal generating module is a third-order intermodulation signal generating circuit. Each patch antenna is provided with a corresponding third-order intermodulation signal generating circuit. The output end of the third-order intermodulation signal generating circuit is connected to the power divider and the input end of the corresponding patch antenna.

5. The controllable radiation type intermodulation interference product generating microstrip antenna array according to claim 1, characterized in that: The excitation signal is a DC bias voltage signal.

6. The controllable radiation type intermodulation interference product generating microstrip antenna array according to claim 5, characterized in that: The controllable radiation type intermodulation and mutual interference product generating microstrip antenna array further includes: a DC bias voltage output module connected to the intermodulation signal generating module, and configured to output a DC bias voltage signal to the intermodulation signal generating module.

7. A design method for a controllable radiation type intermodulation interference product generating microstrip antenna array according to any one of claims 1 to 6, characterized in that: The design method includes: Determining the number of patch antennas, and determining a power divider according to the number of the patch antennas, wherein a plurality of patch antennas are provided, and an input end of each patch antenna is connected to an output end of the power divider; An intermodulation signal generating module is provided according to the number of the patch antennas. One intermodulation signal generating module is provided for each patch antenna, and an output end of the intermodulation signal generating module is connected to an input end of the corresponding patch antenna.

8. The design method of a controllable radiation type intermodulation interference product generating microstrip antenna array according to claim 7, characterized in that: The number of output ports of the power divider is equal to the number of the patch antennas.

9. The design method of a controllable radiation type intermodulation interference product generating microstrip antenna array according to claim 7, characterized in that: The power splitter is an equal-dividing power splitter.

10. The design method of a controllable radiation type intermodulation interference product generating microstrip antenna array according to claim 7, characterized in that: The intermodulation signal generation module includes a third-order intermodulation signal generation circuit. Each patch antenna is correspondingly provided with a third-order intermodulation signal generation circuit. The output end of the third-order intermodulation signal generation circuit is connected to the power divider and the input end of the corresponding patch antenna.

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