CN117741285A - Method for reducing reflection of multi-feed reverberation room antenna - Google Patents
Method for reducing reflection of multi-feed reverberation room antenna Download PDFInfo
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Abstract
A method for reducing the reflection of a multi-feed reverberation room antenna comprises the steps of emptying a reverberation room and building a reverberation room test system; s parameters among receiving antennas and transmitting antennas of the reverberation room testing system are measured to obtain reflection coefficients of the transmitting antennas; the signal source emits signals, and the field intensity in the reverberation room is measured; comparing the measured field intensity in the reverberation room with the target test field intensity; the measured field intensity in the reverberation room is lower than the target test field intensity, a transmitting antenna is added, and the measured field intensity in the reverberation room is improved by utilizing a multi-feed source reverberation room technology; the transmitting antenna is connected with the transmitting link through the power divider; the invention can effectively reduce the energy reflection in the transmitting link while constructing the multi-feed source reverberation chamber, can effectively protect the microwave devices on the transmitting link from the influence of reflected power, provides a feasible technical route for the peak field simulation technology based on the multi-feed source reverberation chamber to be applied, is beneficial to the popularization and application of the reverberation chamber technology, and provides a low-cost and high-efficiency technical scheme selection for peak field simulation.
Description
Technical Field
The invention relates to the field of electromagnetic compatibility testing, and provides a method for reducing reflection of a multi-feed reverberation room antenna.
Background
The external radio frequency electromagnetic environment is one of important test items regulated by the GJB1389A-2005, and aims to check whether the tested equipment can work normally without interference in the external radio frequency electromagnetic environment of the expected application. GJB1389A-2005 specifies that experiments should be conducted in a radio frequency electromagnetic environment characterized by peak and average field strengths, respectively. And the method is limited by the factors such as hardware technology, construction cost and the like of the power amplifier, and only adopts a mean value field for the examination of the adaptability of the external radio frequency electromagnetic environment of the equipment. However, with the increase of the electromagnetic compatibility requirements of the electronic devices, the adaptability of the peak field electromagnetic environment is more and more urgent, and the peak field electromagnetic environment needs to be constructed to perform the examination of related projects on the electronic devices.
The existing peak field simulation is to form an antenna array through multi-antenna stacking. By superposition of the multi-antenna irradiation positions, a peak field electromagnetic environment is built up in a very small test area (small light spot area). When the actual test is carried out, the antenna array is required to be moved, so that the small light spot area traverses all the test positions of the tested equipment. This is a very time consuming and costly solution.
Compared with the high-cost and small-light-spot test area of the prior technical scheme, the reverberation room has the advantages of low cost and large test area. However, there are some limitations on the path of the reverberation room, such as the high reflection characteristics of the reverberation room and the reciprocity of the antenna, which causes excessive reflection energy of the transmitting antenna, and the microwave devices in the test link are easily affected, or even burnt. In particular, multi-feed reverberant chambers, this type of phenomenon is more pronounced. Since this problem is not solved effectively, the reverberant room technique is not widely used in practice in peak field simulation, but exists as a theoretically viable solution and is not in practical use.
For the above reasons, a method of reducing the reflection of a multi-feed reverberant room antenna has been developed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a method for reducing the reflection of a multi-feed source reverberation room antenna, can effectively reduce the energy reflection in a transmitting link while constructing a multi-feed source reverberation room, can effectively protect microwave devices on the transmitting link from being influenced by reflected power, provides a feasible technical route for the peak field simulation technology based on the multi-feed source reverberation room to be applied, is beneficial to popularization and application of the reverberation room technology, and provides a low-cost and high-efficiency technical scheme selection for peak field simulation.
In order to achieve the above purpose, the invention adopts the following technical scheme: a method for reducing reflection of a multi-feed reverberant room antenna,
s1: emptying the reverberation room, and building a reverberation room test system;
s2: s parameters among receiving antennas and transmitting antennas of the reverberation room testing system are measured to obtain reflection coefficients of the transmitting antennas;
s3: the signal source emits signals to measure the field intensity in the reverberation roomWherein lambda is the wavelength of the working frequency; p (P) MaxRec Maximum received power for a certain receiving antenna position and direction for a given number of samples; η (eta) Rx For receiving antenna efficiency, if unknown, the hand is surroundingThe antenna is 0.75 and the horn antenna is 0.9; antenna position and Fang Weishu;
s4: comparing the measured field intensity in the reverberation room with the target test field intensity;
s4.1: the measured field intensity in the reverberation room is higher than the target test field intensity, and then the normal test is carried out;
s4.2: the measured field intensity in the reverberation room is lower than the target test field intensity, a transmitting antenna is added, and the measured field intensity in the reverberation room is improved by utilizing a multi-feed source reverberation room technology; the transmitting antenna is connected with the transmitting link through the power divider;
s4.3: repeating S2 and S3, if the measured field intensity in the reverberation room is still lower than the target test field intensity, continuing to increase the power divider and the transmitting antenna, realizing the serial connection of the power divider in a single link, and increasing the parallel injection of multiple links until the measured field intensity in the reverberation room meets the target test field intensity requirement.
Further, the reverberation room testing system comprises a signal source, a transmitting antenna, a receiving antenna, a two-way coupler, a power meter, an attenuator and a receiver.
Further, the power divider adopts a Wilkinson power divider or a four-port 180-degree hybrid network which is connected with a matched load.
The beneficial effects of the invention are as follows: according to the invention, a reverberation room test system is not required to be changed greatly, and only one or more power dividers are required to be added, so that microwave devices on a transmitting link can be protected; the multi-feed-source injection can be realized through the mode that the power dividers are connected in series, and meanwhile, the signal returned to the transmitting link can be further reduced, so that the microwave devices on the transmitting link can be effectively protected from being influenced by reflected power. The method for reducing the antenna reflection provides a feasible technical route for the application of the peak field simulation technology based on the multi-feed source reverberation chamber, can effectively reduce the energy reflection in the transmitting link while constructing the multi-feed source reverberation chamber, can effectively protect microwave devices on the transmitting link from the influence of reflected power, is beneficial to the popularization and application of the reverberation chamber technology, and provides a low-cost and high-efficiency technical scheme selection for the peak field simulation; the present invention is not described in detail in the prior art.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of an original reverberation room testing system;
FIG. 2 is a schematic diagram of a modified reverberation room testing system;
fig. 3 is a diagram of a Wilkinson power divider equivalent transmission line;
FIG. 4 is a series diagram of Wilkinson power dividers;
FIG. 5 is a four port 180 hybrid network schematic;
fig. 6 is a four port 180 ° hybrid network tandem schematic.
Detailed Description
The invention is further described in detail below with reference to examples and embodiments:
example 1
S1: emptying the reverberation room, and constructing a reverberation room testing system shown in the figure 1; the reverberation room test system comprises a signal source, a transmitting antenna, a receiving antenna, a bidirectional coupler, a power meter, an attenuator and a receiver;
s2: s parameters among receiving antennas and transmitting antennas of the reverberation room testing system are measured to obtain reflection coefficients of the transmitting antennas;
s3: the signal source emits signals to measure the field intensity in the reverberation roomWherein lambda is the wavelength of the working frequency; p (P) MaxRec Maximum received power for a certain receiving antenna position and direction for a given number of samples; η (eta) Rx For receiving antenna efficiency, if not known, the adversary periodic antenna takes 0.75 and the horn antenna takes 0.9; antenna position and Fang Weishu;
s4: comparing the measured field intensity in the reverberation room with the target test field intensity;
s4.1: the measured field intensity in the reverberation room is higher than the target test field intensity, and then the normal test is carried out;
s4.2: the measured field intensity in the reverberation room is lower than the target test field intensity, as shown in figure 2, the output end of the directional coupler is connected to the port 1 of the Wilkinson power divider, and two transmitting antennas are connected to the port 2 and the port 3 of the Wilkinson power divider respectively; the input power is injected from the port 1, the equal amplitude is output from the port 2 and the port 3 after 3dB equally dividing, and then the input power is injected into the reverberation room through the transmitting antenna, and the transmitting antenna also serves as a receiving antenna due to the reciprocity of the antenna; the reverberation indoor electromagnetic environment is different from the characteristics of other test platforms, namely, the characteristics of statistic uniformity, random polarization and isotropy are different in the amplitude, the phase and the polarization of the received electromagnetic wave, when the reflection energy is overlarge, the electromagnetic energy received by different transmitting antennas has different phases and polarization states, and enters a Wilkinson power divider through the transmitting antennas to a channel 2 and a channel 3, and due to the existence of parallel resistors between the two channels, signals with different same amplitude cannot enter the channel 1 but are consumed on the parallel resistors between the two channels, so that the damage to a transmitting link caused by overlarge reflection power is avoided;
s4.3: repeating S2 and S3, if the measured field intensity in the reverberation room is still lower than the target test field intensity, respectively adding a Wilkinson power divider at a port 2 and a port 3 in the figure 3, and respectively accessing transmitting antennas at the tail end ports of the newly added Wilkinson power divider as shown in the figure 4, wherein at the moment, the ports 2-5 in the figure 4 can be respectively accessed into the transmitting antennas to realize multi-stage feed injection until the measured field intensity in the reverberation room meets the target test field intensity requirement; the injection links can also be directly added, and different injection links are arranged in parallel, and as each injection link is provided with a Wilkinson power divider, the different injection links cannot interfere with each other, so that a peak field test environment is built in a reverberation room test area.
Example 2
S1: emptying the reverberation room, and constructing a reverberation room testing system shown in the figure 1; the reverberation room test system comprises a signal source, a transmitting antenna, a receiving antenna, a bidirectional coupler, a power meter, an attenuator and a receiver;
s2: s parameters among receiving antennas and transmitting antennas of the reverberation room testing system are measured to obtain reflection coefficients of the transmitting antennas;
s3: the signal source emits signals to measure the field intensity in the reverberation roomWherein lambda is the wavelength of the working frequency; p (P) MaxRec Maximum received power for a certain receiving antenna position and direction for a given number of samples; η (eta) Rx For receiving antenna efficiency, if not known, the adversary periodic antenna takes 0.75 and the horn antenna takes 0.9; antenna position and Fang Weishu;
s4: comparing the measured field intensity in the reverberation room with the target test field intensity;
s4.1: the measured field intensity in the reverberation room is higher than the target test field intensity, and then the normal test is carried out;
s4.2: the measured field intensity in the reverberation room is lower than the target test field intensity, as shown in figure 2, the output end of the directional coupler is connected to a port 1 of a 180-degree hybrid network, two transmitting antennas are respectively connected to a port 2 and a port 3 of the 180-degree hybrid network, and at the moment, the port 4 is connected with a high-power matching load; in this embodiment, port 4 is connected to a matching load, port 1 is used as a signal input end, signals are equally divided and injected into a reverberation room from port 2 and port 3, and because of the random polarization and statistically uniform characteristics of the reverberation room, the signals returned to port 2 and port 3 through a transmitting antenna are different polarization devices and are not in constant amplitude and phase any more, the sum signal formed at port 1 is very small, and the purpose of protecting a transmitting link is also achieved;
s4.3: repeating S2 and S3, if the measured field intensity in the reverberation room is still lower than the target test field intensity, respectively adding a four-port 180-degree hybrid network at a port 2 and a port 3 in the figure 3, and respectively accessing transmitting antennas at the tail end ports of the newly added four-port 180-degree hybrid network as shown in the figure 6, wherein the ports 3-6 in the figure 6 can be respectively accessed to the transmitting antennas at the moment, so as to realize multi-stage feed injection until the measured field intensity in the reverberation room meets the target test field intensity requirement; injection links can also be directly added, and different injection links are arranged in parallel. Because each injection link is provided with a four-port 180-degree hybrid network, different injection links cannot interfere with each other, and therefore a peak field test environment is built in a reverberation room test area.
The foregoing is merely illustrative of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention, and therefore, the scope of the present invention shall be defined by the scope of the appended claims.
Claims (3)
1. A method of reducing reflection from a multi-feed reverberant room antenna, comprising:
s1: emptying the reverberation room, and building a reverberation room test system;
s2: s parameters among receiving antennas and transmitting antennas of the reverberation room testing system are measured to obtain reflection coefficients of the transmitting antennas;
s3: the signal source emits signals to measure the field intensity in the reverberation roomWherein lambda is the wavelength of the working frequency; p (P) MaxRec Maximum received power for a certain receiving antenna position and direction for a given number of samples; η (eta) Rx For receiving antenna efficiency, if not known, the adversary periodic antenna takes 0.75 and the horn antenna takes 0.9; antenna position and Fang Weishu;
s4: comparing the measured field intensity in the reverberation room with the target test field intensity;
s4.1: the measured field intensity in the reverberation room is higher than the target test field intensity, and then the normal test is carried out;
s4.2: the measured field intensity in the reverberation room is lower than the target test field intensity, a transmitting antenna is added, and the measured field intensity in the reverberation room is improved by utilizing a multi-feed source reverberation room technology; the transmitting antenna is connected with the transmitting link through the power divider;
s4.3: repeating S2 and S3, if the measured field intensity in the reverberation room is still lower than the target test field intensity, continuing to increase the power divider and the transmitting antenna, realizing the serial connection of the power divider in a single link, and increasing the parallel injection of multiple links until the measured field intensity in the reverberation room meets the target test field intensity requirement.
2. A method of reducing reflection from a multi-feed reverberant room antenna according to claim 1, wherein: the reverberation room testing system comprises a signal source, a transmitting antenna, a receiving antenna, a two-way coupler, a power meter, an attenuator and a receiver.
3. A method of reducing reflection from a multi-feed reverberant room antenna according to claim 1, wherein: the power divider adopts a Wilkinson power divider or a four-port 180-degree hybrid network which is connected with a matched load.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118191485A (en) * | 2024-05-15 | 2024-06-14 | 中汽研新能源汽车检验中心(天津)有限公司 | Method, system, medium and product for verifying signal transmission characteristics of electromagnetic environment of reverberation room |
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- 2023-11-22 CN CN202311570598.3A patent/CN117741285A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118191485A (en) * | 2024-05-15 | 2024-06-14 | 中汽研新能源汽车检验中心(天津)有限公司 | Method, system, medium and product for verifying signal transmission characteristics of electromagnetic environment of reverberation room |
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