9 results about "Microwave anechoic chamber" patented technology

This invention discloses a near-field scanning detection method based on active learning to obtain conducted coupling paths. The method includes: constructing a near-field scanning detection platform; placing the circuit board under test (PCB) in a microwave anechoic chamber; and using the near-field scanning detection platform directly above the PCB to perform detection; obtaining the detection results using an active learning-based near-field scanning method; and obtaining a near-field current distribution map on the PCB at continuous time intervals based on the detection results, thereby realizing the detection of conducted coupling paths. This invention utilizes active machine learning methods to achieve more efficient near-field scanning detection, concentrating scanning points in areas with strong currents and accurately reconstructing the actual current changes of the PCB using the scan results of sparse points, greatly improving detection efficiency. By using near-field scanning detection to reconstruct the current changes on the circuit board, the coupling paths of conducted interference currents on the PCB can be quickly analyzed, meeting the requirements for detecting electromagnetic interference in systems in practical engineering.

This invention relates to a miniature dual-frequency microwave anechoic chamber based on spatially distributed ultrathin absorbing materials. It includes a rigid cylindrical shell mounted on a support. An ultrathin dual-frequency electromagnetic wave absorbing unit and a transmitting antenna are attached to the inner wall of the rigid cylindrical shell. The ultrathin dual-frequency electromagnetic wave absorbing unit and the transmitting antenna are integrally formed, and the transmitting antenna is a microstrip patch antenna. This invention, through research on spatially distributed ultrathin electromagnetic wave absorbing materials, realizes a wavelength-scale miniature dual-frequency microwave anechoic chamber. The shape and size of the microwave anechoic chamber can be customized according to actual application requirements, and it is expected to be widely used in antenna measurement, microwave imaging, and other fields. This invention features low cost, simple construction, and portability.

The application provides a simplified test method and device for batch-produced satellite receiving sensitivity. The method comprises: S1: performing classification processing on batch-produced satellites, selecting a representative satellite from each class, and performing steps S11-S16 on each representative satellite in parallel; S2: counting a target sensitivity set of all classes to obtain an overall test result of the batch-produced satellites; S1 comprises S14: measuring a corresponding second ground test signal level of a satellite in a target microwave anechoic chamber; S15: calculating the receiving sensitivity of the satellite in the target microwave anechoic chamber according to the difference between the second ground test signal level and the first ground test signal level; S16: replacing a new satellite and repeating S14-S15 until a target sensitivity set composed of the receiving sensitivities of all satellites in the target microwave anechoic chamber is obtained, thereby improving the test efficiency of the receiving sensitivity of the existing batch-produced satellites.

The application relates to the technical field of loop simulation testing, and relates to a C-V2X whole vehicle loop simulation system based on a microwave darkroom and a testing method. The method comprises the following steps: a measured whole vehicle: a whole vehicle loaded with a real C-V2X terminal, which is placed on a rotating hub platform in the microwave darkroom and is driven by a driver to simulate real road conditions; a speed sensor: collecting the speed of the measured vehicle in real time and synchronizing the speed to a virtual traffic scene; a satellite simulator simulating a satellite positioning signal and sending the satellite positioning signal to the whole vehicle; a scene simulation software used for loading a virtual simulation scene; a high-performance computing platform used for running scene simulation control software, C-V2X protocol stack software and GNSS device automatic control software; traffic participant information is sent to the measured whole vehicle through a V2X communication module, and the positioning of the measured whole vehicle is sent to the measured whole vehicle through the satellite simulator. The application can safely and repeatedly reproduce dangerous working conditions in the microwave darkroom environment, and verify the function triggering state of the networked vehicle.

This utility model discloses a microwave anechoic chamber capable of reducing environmental interference, belonging to the field of microwave anechoic chamber technology. It includes a base plate with two sets of composite buffer mechanisms on the base plate. A microwave anechoic chamber is mounted on each of the two sets of composite buffer mechanisms. Each composite buffer mechanism includes two lower support plates fixedly connected to the base plate, and two upper support plates fixedly connected to the bottom of the microwave anechoic chamber. Piston ports are fixedly connected to the bottom of the upper support plates and the top of the lower support plates. Four rotating seats are fixedly connected to the bottom and top of the upper support plates, and pressure-bearing arms are rotatably connected to the rotating seats. This utility model, through the composite buffer mechanism, provides sufficient buffer protection for the microwave anechoic chamber through the double buffering of two buffer springs and an airtight chamber. Furthermore, two brake teeth plates inside the slider can limit the slider's movement, thereby ensuring the stability of the microwave anechoic chamber.

This invention discloses a plane wave synthesizer, testing system, and method based on a dual / multi-band co-aperture ultra-wideband Vivaldi dual-polarized array. The plane wave synthesizer includes an amplitude and phase controller, and an ultra-wideband Vivaldi three-band co-aperture antenna array or an ultra-wideband Vivaldi dual-band co-aperture antenna array. The testing system includes the plane wave synthesizer, a microwave anechoic chamber, a turntable within the anechoic chamber, and the device under test (DUT). The microwave anechoic chamber also includes an electromagnetic shield and radio frequency absorbing materials around its perimeter. During testing, the amplitude and phase controller generates multi-band radio frequency excitation signals to drive the ultra-wideband Vivaldi three-band co-aperture antenna array or the ultra-wideband Vivaldi dual-band co-aperture antenna array, forming a uniform plane wave in the near-field radiation. This invention eliminates the need for near-field and far-field transformation of electromagnetic waves, reducing the required space by three-quarters compared to systems based on compact fields, making it particularly suitable for generating large-size ultra-wideband quiet zones.

The present application relates to a kind of microwave anechoic chamber with icing conductor measurement support, microwave anechoic chamber measuring device.The present application provides a kind of microwave anechoic chamber with icing conductor measurement support, comprising: support unit, for supporting transmission line;Refrigeration unit, for spraying refrigeration medium to the transmission line surface;Control unit is connected with the refrigeration unit, for controlling the refrigeration medium to carry out intermittent injection at preset interval;Wherein, the refrigeration unit and control unit are fixed on the support unit, the control unit is electrically connected with the refrigeration unit, the support unit is made of low electromagnetic scattering material.The present application fundamentally solves the industry problem that icing conductor cannot be stably measured due to rapid melting in normal temperature microwave anechoic chamber, and creates and maintains necessary low-temperature microenvironment for measurement target by accurate and controllable local active refrigeration, effectively prolongs effective imaging measurement time.