CN114065467A - Equipment sensitivity threshold design method based on antenna harmonic wave and spurious wave output - Google Patents

Equipment sensitivity threshold design method based on antenna harmonic wave and spurious wave output Download PDF

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CN114065467A
CN114065467A CN202111004060.7A CN202111004060A CN114065467A CN 114065467 A CN114065467 A CN 114065467A CN 202111004060 A CN202111004060 A CN 202111004060A CN 114065467 A CN114065467 A CN 114065467A
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CN114065467B (en
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李尧尧
蔡少雄
胡宗奇
苏东林
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Beihang University
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Abstract

The invention discloses an equipment sensitivity threshold design method based on antenna harmonic wave and spurious wave output, which comprises the following steps: the method comprises the following steps: s1, determining an electromagnetic interference model between devices; s2, giving overall indexes of harmonic waves and chaotic wave output of the interference source antenna; s3, designing a sensitivity threshold of a sensitive source according to a given overall index; the electromagnetic interference model between the devices comprises an interference source and a sensitive source; when the sensitive source is a non-radio frequency device, a transmitting antenna of the interference source transmits signals, generates a coupling effect on a signal line or a control line of the sensitive source, and is coupled into the sensitive source through a port; when the sensitive source is a radio frequency device, the transmitting antenna of the interference source generates a coupling effect with the radio frequency line of the sensitive source when transmitting signals, and the coupling effect is injected into the sensitive source through the radio frequency port. The invention is beneficial to having the capability of resisting the electromagnetic interference radiated and emitted by the antenna by designing the sensitivity threshold of the sensitive source and has certain safety margin.

Description

Equipment sensitivity threshold design method based on antenna harmonic wave and spurious wave output
Technical Field
The invention relates to a sensitive threshold design, in particular to a device sensitive threshold design method based on antenna harmonic wave and spurious wave output.
Background
Electromagnetic compatibility (EMC) refers to a property that describes the electromagnetic emission and electromagnetic interference resistance of an electronic, electrical device or system itself, i.e., the property that they work properly under certain electromagnetic environments and according to certain requirements. With the development of electronic devices, apparatuses and systems toward miniaturization, integration, complication, high sensitivity, high power, high speed and broadband, the mounting density of electronic apparatuses mounted on electronic system platforms is greatly increased, which leads to the problem of electromagnetic interference (EMI) among electronic apparatuses to be more and more prominent, and thus the problem of electromagnetic interference of electronic apparatuses and systems becomes more serious, and thus electromagnetic compatibility is an important index of various electronic and electrical apparatuses or systems, and is also a problem of great concern of engineering technicians.
The antenna radiation field RE103 can reach 200V/m, generates coupling effect on a signal line and a control line, is coupled into the device through a port, can also generate coupling effect with a radio frequency line, is injected into the device through the radio frequency port, and is a main factor for interfering other systems. In order to ensure that the devices do not interfere with each other and can work normally, sensitive indexes of the antenna and the cable need to be designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for designing the sensitivity threshold of equipment based on antenna harmonic wave and spurious wave output, which is beneficial to resisting the electromagnetic interference of antenna radiation emission and has certain safety margin by designing the sensitivity threshold of a sensitive source.
The purpose of the invention is realized by the following technical scheme: a device sensitivity threshold design method based on antenna harmonic wave and spurious wave output comprises the following steps:
s1, determining an electromagnetic interference model between devices;
s2, giving overall indexes of harmonic waves and chaotic wave output of the interference source antenna;
and S3, designing a sensitivity threshold of the sensitive source according to the given overall index.
Further, in step S1, the electromagnetic interference model between the devices includes an interference source and a sensitive source;
when the sensitive source is a non-radio frequency device, a transmitting antenna of the interference source transmits signals, generates a coupling effect on a signal line or a control line of the sensitive source, and is coupled into the sensitive source through a port;
when the sensitive source is a radio frequency device, the transmitting antenna of the interference source generates a coupling effect with the radio frequency line of the sensitive source when transmitting signals, and the coupling effect is injected into the sensitive source through the radio frequency port.
Further, in step S2, the overall index of the interference source antenna harmonic and the spurious wave output is obtained according to the test of the electromagnetic compatibility RE103, or is directly set according to the equipment requirement.
Further, in step S3, when the sensitive source is a radio frequency device, determining a sensitivity threshold S of the sensitive source:
the spatial isolation between the transmitting antenna of the interference source and the receiving antenna of the sensitive source is set to be L/dB, so that the field intensity acting on the receiving antenna is as follows:
Ereceiving＝Ere103/10L/20
Wherein E isre103The overall index of the harmonic wave and the spurious wave output of the interference source antenna is represented;
the radiation field of the interference source generates a coupling effect on the radio frequency line, a sensitive source is injected through a radio frequency port, and port induction voltage is obtained by establishing a coupling effect relation function H(s) of a field environment and the radio frequency line:
Udifferential mode＝Ere103·H(s)；
Let R be the antenna port equivalent load, i.e. the power of the port load is:
Figure RE-GDA0003306373620000022
according to the sensitivity threshold SPort(s)＝10lgPPort(s)And a design margin of 6dB is left, thereby deriving a sensitivity threshold S for the sensitive source, as shown in the following formula:
Figure RE-GDA0003306373620000021
wherein SPort(s)Antenna port power, unit: dBm, fdownLower frequency limit of the receiving antenna, fupIs the lower frequency limit of the receiving antenna; f. ofelseIs represented by [ fdown,fup]Outside frequency band, phifIndicating that the device is in the test frequency band ftestThe degree of inhibition.
Further, in step S3, when the sensitive source is a non-radio frequency device, determining sensitive thresholds of the cable common-mode current and the differential-mode voltage in the sensitive source:
the radiation field of the interference source generates a coupling effect on the cable, flows into the equipment through a cable port, and needs to establish a common mode coupling effect relation function F(s) of the field and the cable and a differential mode coupling effect relation function H'(s) of the field and the cable for decomposing the electromagnetic compatibility index of the cable; wherein the cable includes a signal line and a control line.
Calculating the sensitivity threshold of the common mode current and the differential mode voltage:
Icommon mode＝Ere103·F(s)
UDifferential mode＝Ere103·H'(s)
Converting the sensitive threshold values of the common mode current and the differential mode voltage into a dB form, and reserving a design margin of 6dB to obtain:
Figure RE-GDA0003306373620000031
the invention has the beneficial effects that: the invention is based on the total index of the harmonic wave and the chaotic wave output of the given interference source antenna, the sensitive threshold of the sensitive source is designed, which is helpful for resisting the electromagnetic interference of the radiation emission of the antenna and has a certain safety margin, when the sensitive source sensitive index is designed and distributed, the design value of the sensitive index is only needed to be larger than the obtained sensitive threshold (when the sensitive source is a radio frequency device, the sensitive index of the designed sensitive source is larger than the sensitive threshold S, and when the sensitive source is a non-radio frequency device, the sensitive source is not a radio frequency device, the sensitive index of the designed sensitive source is larger than the sensitive threshold SThe common-mode current sensitivity index of the cable is more than PIThe sensitivity index of the differential mode voltage of the cable of the sensitive source is greater than PU) And the requirement of the electromagnetic compatibility anti-interference performance limit value of the system can be met.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic diagram of a topology of an electromagnetic interference model;
FIG. 3 is a schematic diagram of the response when the sensitive source is a radio frequency device;
fig. 4 is a response diagram when the sensitive source is a non-rf device.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, a method for designing a device sensitivity threshold based on antenna harmonic and spurious output includes the following steps:
s1, determining an electromagnetic interference model between devices;
s2, giving overall indexes of harmonic waves and chaotic wave output of the interference source antenna;
and S3, designing a sensitivity threshold of the sensitive source according to the given overall index.
Further, in step S1, the electromagnetic interference model between the devices includes an interference source and a sensitive source;
when the sensitive source is a non-radio frequency device, a transmitting antenna of the interference source transmits signals, generates a coupling effect on a signal line or a control line of the sensitive source, and is coupled into the sensitive source through a port;
when the sensitive source is a radio frequency device, the transmitting antenna of the interference source generates a coupling effect with the radio frequency line of the sensitive source when transmitting signals, and the coupling effect is injected into the sensitive source through the radio frequency port. The topology of the electromagnetic interference model is shown in fig. 2.
Further, in step S2, the overall index of the interference source antenna harmonic and the spurious wave output is obtained according to the test of the electromagnetic compatibility RE103, or is directly set according to the equipment requirement.
As shown in fig. 3, in step S3, when the sensitive source is a radio frequency device, determining a sensitivity threshold S of the sensitive source:
the spatial isolation between the transmitting antenna of the interference source and the receiving antenna of the sensitive source is set to be L/dB, so that the field intensity acting on the receiving antenna is as follows:
Ereceiving＝Ere103/10L/20
Wherein E isre103The overall index of the harmonic wave and the spurious wave output of the interference source antenna is represented;
the radiation field of the interference source generates a coupling effect on the radio frequency line, a sensitive source is injected through a radio frequency port, and the port induced voltage is obtained by establishing a coupling effect relation function H(s) (which can be obtained by a simulation or experimental test method and is taken as a known function determined in advance in the practical application process) of the field environment and the radio frequency line:
Udifferential mode＝Ere103·H(s)；
Let R be the antenna port equivalent load, i.e. the power of the port load is:
Figure RE-GDA0003306373620000041
according to the sensitivity threshold SPort(s)＝10lgPPort(s)And a design margin of 6dB is left, thereby deriving a sensitivity threshold S for the sensitive source, as shown in the following formula:
Figure RE-GDA0003306373620000042
wherein SPort(s)Antenna port power, unit: dBm, fdownLower frequency limit of the receiving antenna, fupIs the lower frequency limit of the receiving antenna; f. ofelseIs represented by [ fdown,fup]A frequency band other than the frequency band; phi is afIndicating that the device is in the test frequency band ftestThe suppression degree can be directly given, and can also be obtained through the antenna terminal sensitive items CS103, CS104, CS105 test.
As shown in fig. 4, in step S3, when the sensitive source is a non-radio frequency device, the sensitivity thresholds of the cable common-mode current and the differential-mode voltage in the sensitive source are determined:
the radiation field of the interference source generates a coupling effect on the cable, flows into the equipment through a cable port, and needs to establish a common mode coupling effect relation function F(s) of the field and the cable and a differential mode coupling effect relation function H '(s), F(s) and H'(s) of the field and the cable in order to decompose the electromagnetic compatibility index of the cable, wherein the common mode coupling effect relation function F(s) and the differential mode coupling effect relation function H '(s), F(s) and H'(s) of the field and the cable can be obtained by a simulation or experimental test method; in the practical application process, the function is taken as a known function which is determined in advance; wherein the cable includes a signal line and a control line.
Calculating the sensitivity threshold of the common mode current and the differential mode voltage:
Icommon mode＝Ere103·F(s)
UDifferential mode＝Ere103·H'(s)
Converting the sensitive threshold values of the common mode current and the differential mode voltage into a dB form, and reserving a design margin of 6dB to obtain:
Figure RE-GDA0003306373620000043
the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (5)

1. A method for designing a device sensitivity threshold based on antenna harmonic wave and spurious wave output is characterized by comprising the following steps: the method comprises the following steps:
s1, determining an electromagnetic interference model between devices;
s2, giving overall indexes of harmonic waves and chaotic wave output of the interference source antenna;
and S3, designing a sensitivity threshold of the sensitive source according to the given overall index.
2. The method for designing the sensitivity threshold of the equipment based on the harmonic wave and the spurious wave output of the antenna according to claim 1, wherein the method comprises the following steps: in step S1, the electromagnetic interference model between devices includes an interference source and a sensitive source;
when the sensitive source is a non-radio frequency device, a transmitting antenna of the interference source transmits signals, generates a coupling effect on a signal line or a control line of the sensitive source, and is coupled into the sensitive source through a port;
when the sensitive source is a radio frequency device, the transmitting antenna of the interference source generates a coupling effect with the radio frequency line of the sensitive source when transmitting signals, and the coupling effect is injected into the sensitive source through the radio frequency port.
3. The method for designing the sensitivity threshold of the equipment based on the harmonic wave and the spurious wave output of the antenna according to claim 1, wherein the method comprises the following steps: in step S2, the overall indexes of the interference source antenna harmonic and the spurious wave output are obtained according to the electromagnetic compatibility RE103 test, or are directly set according to the equipment requirements.
4. The method for designing the sensitivity threshold of the equipment based on the harmonic wave and the spurious wave output of the antenna according to claim 1, wherein the method comprises the following steps: in step S3, when the sensitive source is a radio frequency device, determining a sensitivity threshold S of the sensitive source:
the spatial isolation between the transmitting antenna of the interference source and the receiving antenna of the sensitive source is set to be L/dB, so that the field intensity acting on the receiving antenna is as follows:
Ereceiving＝Ere103/10L/20
Wherein E isre103The overall index of the harmonic wave and the spurious wave output of the interference source antenna is represented;
the radiation field of the interference source generates a coupling effect on the radio frequency line, a sensitive source is injected through a radio frequency port, and port induction voltage is obtained by establishing a coupling effect relation function H(s) of a field environment and the radio frequency line:
Udifferential mode＝Ere103·H(s)；
Let R be the antenna port equivalent load, i.e. the power of the port load is:
Figure RE-FDA0003306373610000011
according to the sensitivity threshold SPort(s)＝10lgPPort(s)And a design margin of 6dB is left, thereby deriving a sensitivity threshold S for the sensitive source, as shown in the following formula:
Figure RE-FDA0003306373610000012
wherein SPort(s)Antenna port power, unit: dBm, fdownLower frequency limit of the receiving antenna, fupIs the lower frequency limit of the receiving antenna; f. ofelseIs represented by [ fdown,fup]Outside frequency band, phifIndicating that the device is in the test frequency band ftestThe degree of inhibition.
5. The method for designing the sensitivity threshold of the equipment based on the harmonic wave and the spurious wave output of the antenna according to claim 1, wherein the method comprises the following steps: in step S3, when the sensitive source is a non-radio frequency device, determining sensitive thresholds of a common-mode current and a differential-mode voltage of the cable in the sensitive source:
the radiation field of the interference source generates a coupling effect on the cable, flows into the equipment through a cable port, and needs to establish a common mode coupling effect relation function F(s) of the field and the cable and a differential mode coupling effect relation function H'(s) of the field and the cable for decomposing the electromagnetic compatibility index of the cable; wherein the cable includes a signal line and a control line.
Calculating the sensitivity threshold of the common mode current and the differential mode voltage:
Icommon mode＝Ere103·F(s)
UDifferential mode＝Ere103·H'(s)
Converting the sensitive threshold values of the common mode current and the differential mode voltage into a dB form, and reserving a design margin of 6dB to obtain:
Figure RE-FDA0003306373610000021
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CN101661061A (en) * 2009-09-18 2010-03-03 中国舰船研究设计中心 Method for confirming anti-high RF interferece threshold of electronic information equipment
CN106053982A (en) * 2016-05-25 2016-10-26 北京航空航天大学 Electromagnetic compatibility analysis method of radio-frequency module backboard
CN106872831A (en) * 2017-03-27 2017-06-20 北京空间飞行器总体设计部 Interference source determines method in highly sensitive antenna of receiving device band in microwave load satellite
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