CN103296397A - Balun-free low-profile single-arm Archimedean spiral antenna - Google Patents
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- CN103296397A CN103296397A CN2013101652614A CN201310165261A CN103296397A CN 103296397 A CN103296397 A CN 103296397A CN 2013101652614 A CN2013101652614 A CN 2013101652614A CN 201310165261 A CN201310165261 A CN 201310165261A CN 103296397 A CN103296397 A CN 103296397A
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Abstract
The invention discloses a balun-free low-profile single-arm Archimedean spiral antenna and relates to the structure of the Archimedean spiral antenna for detecting ultrahigh frequency electromagnetic signals. The antenna mainly comprises a dielectric substrate, a spiral antenna body, a metal circular disc, a coaxial cable connector and the like. The antenna has the advantages that a feed balun is not needed, the height of a profile can reach below 1cm, the manufacturing precision of the spiral antenna is high, the performance is stable, a detection bandwidth reaches 1GHz, the gain is larger than 5dB, the anti-interference capacity is strong, the cost is low, and the ultrahigh frequency detecting requirements of partial discharge of power transformers and other electrical equipment can be met. The balun-free low-profile single-arm Archimedean spiral antenna can be widely used for detecting the local discharge signals of the electric equipment, and is especially suitable for monitoring the local discharge signals of the power transformers.
Description
Technical field
The invention belongs to the ultra-high frequency antenna technical field, be specifically related to detect the structure of the Archimedian spiral antenna of hyperfrequency electromagnetic signal.
Background technology
In recent years, along with improving constantly of voltage class of electric power system, the fine or not direct relation of power equipment insulation property the safe and stable operation of electric power system.The Partial Discharge Detection method is to judge the effective ways of power equipment insulation property, detection method for local discharge commonly used has pulse current method, sound detection, gas chromatography, hyperfrequency (UHF) detection method, wherein the hyperfrequency detection method can effectively be avoided electromagnetic interference signals such as corona discharge, switching manipulation, has stronger antijamming capability, therefore the characteristics such as accuracy height that detect have obtained extensive use in the Partial Discharge Detection field in recent years.The hyperfrequency detection method uses ultra-high frequency antenna as transducer, detects the local discharge signal of power equipment, in order to monitor the insulation property of power equipment.Archimedian spiral antenna becomes one of the most frequently used transducer of hyperfrequency detection method because having numerous superiority such as low section, wide band, circular polarization.
Existing Archimedian spiral antenna, be " the built-in miniature ultra wide band transducer of sense switch cabinet partial discharge " patent of ZL201220390641.9 as the patent No., disclosed transducer mainly comprises Ba Lun, reflection cavity of Archimedian spiral antenna, the spiral structure of can, insulation medium board, arm structure etc.The major defect of this transducer is:
1, this antenna adopts both arms Archimedian screw structure, belong to from complementary type both arms balanced feeding antenna, so the theoretical impedance of antenna is 180 Ω that antenna two arms will guarantee by the identical electric current of amplitude.Must use feed Ba Lun for the balanced feeding of realizing antenna and 50 Ω coaxial cables, the existence of feed Ba Lun has increased the complexity of antenna structure, has increased the section height of antenna simultaneously, can not realize extremely hanging down section.
2, this antenna enlarges the antenna bandwidth of operation by adopting the high-k dielectric, with respect to conventional insulating material high-k dielectric cost of manufacture and manufacture difficulty height.
And for example the patent No. is " balun-free low-section plane two-arm groove helical array antenna " patent of ZL200910053870.4, disclosed transducer mainly comprises ceramic dielectric plate, annular microstrip transmission line, plane two-arm groove helical array, absorption resistance etc., still has following shortcoming though this transducer has been broken away from this transducer of constraint of feed Ba Lun:
1, the detection frequency band of this antenna is narrower only is 1.52～1.62GHz, and absolute bandwidth is 100MHz only, and the frequency band of power equipment partial discharges such as power transformer is 300～3000MHz.Therefore this antenna can not satisfy the basic demand of power equipment local discharge superhigh frequency detections such as power transformer, can not detect the local discharge signal of power equipments such as power transformer effectively and accurately, the insulation property of power equipments such as power transformer can not be effectively accurately monitored, the safe and stable operation of electric power system can't be guaranteed.
2, this antenna adopts the helical array structure to increase the feed element of antenna, and the antenna feed difficulty increases, and this antenna requires each aerial array to have very high symmetry simultaneously, and the antenna manufacture difficulty increases.
3, this antenna adopts the mode of microstrip line groove coupling that two arm helical array unit are carried out feed, compares with the contact feeding classification, and the coupling feeding classification is subject to the external environment influence, can not guarantee the reliability of antenna work.
Summary of the invention
The objective of the invention is the deficiency at existing Archimedian spiral antenna, propose a kind of single armed Archimedian spiral antenna of balun-free low-section.Has the constraint that to break away from feed Ba Lun, feed is convenient, simple in structure, cost of manufacture is low, can accomplish extremely to hang down characteristics such as section, job stability height, can detect local discharge signal in electric power equipment such as power transformer effectively and accurately, guarantee the safe and stable operation of electric power system.
The technical scheme that realizes the object of the invention is: a kind of single armed Archimedian spiral antenna of balun-free low-section mainly comprises dielectric substrate, helical antenna, rosette, coaxial fitting etc.
It is FR-4 or CEM-3 etc. that the material of described dielectric substrate adopts the base material of printed circuit board (PCB).Because the thickness of dielectric substrate directly influences the impedance operator of antenna, for guaranteeing that antenna feed impedance maintains 50 Ω in 300MHz～3000MHz hyperfrequency frequency range (being the frequency range of the local discharge signal of power equipment such as power transformer), determine that by the calculating of antenna analysis software the thickness of described dielectric substrate is 0.5～2mm, when the thickness of described dielectric substrate during less than 0.5mm, the mechanical strength of antenna arm can not reach requirement; When the thickness of described dielectric substrate during greater than 2mm, the input impedance characteristic of antenna can not be stabilized in 50 Ω.For the symmetry that guarantees antenna structure saves material simultaneously, described dielectric substrate be shaped as circle.For the lower-cut-off frequency that guarantees antenna in 300～3000MHz hyperfrequency frequency range, determine that according to electric current endless belt theoretical analysis and calculation the diameter of described circle is 150～250mm.When the diameter of described circle during less than 150mm, the lower-cut-off frequency of antenna exceeds this hyperfrequency frequency range, can't satisfy the basic demand that power equipment local discharge superhigh frequency such as transformer detects; When the diameter of described circle during greater than 250mm, this antenna size is excessive, increases the cost of manufacture of antenna medium substrate, increases the installation difficulty of antenna simultaneously.
Described helical antenna adopts single armed Archimedian screw structure.The material of described helical antenna is copper, for the spiral number of turns of the described single armed Archimedian screw of maximization of realizing the antenna receiving efficiency is 8～20 circles.When the number of turns of described spiral was enclosed less than 8, the antenna receiving efficiency was low; When the number of turns of described spiral was enclosed greater than 20, the receiving efficiency of antenna did not improve, and waste material is so the spiral number of turns of described helical antenna is 8～20 circles.The inside/outside diameter size of described spiral directly influences the bandwidth of operation of antenna, calculates the external diameter (2R that determines described spiral by moment Method Analysis
2) be the internal diameter (2R of 140～240mm, described spiral
1) be 15～40mm.When the external diameter of described spiral was greater than or less than 140～240mm, the frequency that the lower-cut-off frequency of antenna all can not satisfy ultra-high frequency antenna was the requirement of 300MHz.When being greater than or less than 15～40mm with internal diameter that should described spiral, the frequency that the upper cut-off frequency of antenna all can not satisfy ultra-high frequency antenna is the requirement of 3000MHz.The rotation direction of described spiral is left-handed or dextrorotation, and rotation direction is the left-handed left-hand circular polarization ripple that then produces, and rotation direction is that dextrorotation then produces the right-handed circular polarization ripple.The cross section of described helical antenna is rectangle, and for reducing the size of aerial loss resistance, the length of described rectangle is 2～5mm, and height is 50～100 μ m.When the length of described rectangle during less than 2mm, the loss resistance of antenna increases; When described rectangle grow up in 5mm the time, the aggravation of coupling influence between the adjacent antenna arm influences the combination property of antenna.For enlarging the effective bandwidth of antenna, the terminal cross section of described helical antenna is decreased to a bit gradually.For guaranteeing that antenna can apex drive, the fixedly connected cone-shaped metal sheet in the top of described helical antenna, the O place, the center of circle that the summit of described cone-shaped metal sheet is positioned at described dielectric substrate links to each other with the coaxial fitting inner core.The cone angle size of described cone-shaped metal sheet influences maximum gain and the central task frequency of antenna, and the material of described cone-shaped metal sheet was defined as copper after optimization was analyzed, and cone angle is defined as 60 °～120 °, and bus length is 9.5～25mm, and thickness is 50～100 μ m.When the cone angle of described cone-shaped metal sheet was greater than or less than 60 °～120 °, the maximum gain of antenna all descended rapidly, and centre frequency all is offset.Described helical antenna adopts printed circuit technology to be etched on the described dielectric substrate to realize automation and the precise treatment of manufacturing process.
The diameter of described rosette is that 30～90mm, thickness are 0.2～2mm, and the material of described rosette is copper or iron or aluminium.The diameter of described rosette directly influences directivity and the return loss of antenna, the antenna software emulation is the result show: the diameter of described rosette is less than 30mm, the return loss of antenna can't satisfy the requirement of all channel antenna, the diameter of described rosette is greater than 90mm, and serious distortion then takes place the directional diagram of antenna.Described rosette be positioned at described dielectric substrate under, the upper surface of described rosette is 2～8mm apart from the distance of the lower surface of described dielectric substrate.When the upper surface of described rosette apart from the distance of the lower surface of described dielectric substrate during less than 2mm, the input impedance of antenna can not reach 50 Ω, can not be with 50 Ω coaxial cable direct feeds; When the upper surface of described rosette apart from the distance of the lower surface of described dielectric substrate during greater than 8mm, the section height of antenna increases, and can not satisfy the requirement of low section.The mechanical stability of the thickness effect antenna of described rosette, when thickness during less than 0.2mm, the mechanical stability variation of antenna; When thickness during greater than 2mm, it is big that the weight of antenna becomes, and practicality reduces.
The model of described coaxial fitting is commercial SMA-KWE or SMA-KFD6 or SMA-KFD7.The periphery of described coaxial fitting is fixed on the circle centre position of the lower surface of described rosette, and described coaxial fitting inner core passes the center of circle of described rosette and the center of circle of described dielectric substrate, and joins with described cone-shaped metal sheet.The reception signal of described helical antenna transfers to the coaxial signal transmission line by described coaxial fitting.
After the present invention adopts technique scheme, mainly contain following effect:
1, the present invention adopts single armed Archimedian screw structure, and replaced an antenna arm of traditional both arms Archimedian spiral antenna with a rosette, changed traditional both arms Archimedian spiral antenna from complementary balanced feed structure, can realize uneven feed.The input impedance of antenna can be stabilized in 50 Ω by optimizing the every hardware parameter that calculates rationally definite antenna, realize and the direct feed of 50 Ω coaxial cables there is not the constraint of feed Ba Lun.Therefore antenna does not need feed Ba Lun, and antenna can be accomplished the extremely low section that 1cm is following.
2, antenna of the present invention adopts printed circuit board material and printed circuit technology to make, and the material of dielectric substrate is substrate for printed circuit board commonly used, draws materials conveniently, cost of manufacture is low.Adopt printed circuit technology to increase the making precision of antenna at dielectric substrate, guaranteed the stable of the every performance of antenna, so the stability of antenna of the present invention is good.
3, antenna of the present invention has changed the structure of traditional both arms Archimedian spiral antenna, has determined the parameters of new structure antenna by Finite Element emulation, has guaranteed the broadband character of antenna.Actual measurement shows that antenna detection frequency bandwidth of the present invention reaches 1GHz, greater than 5dB, can satisfy the basic demand of power equipment local discharge superhigh frequency detections such as power transformer in the gain of effective band width range internal antenna.
4, antenna structure of the present invention is simple, has adopted the direct contact type feeding classification, and external environment changes little to the influence of antenna performance, and antijamming capability is strong, the detection accuracy height.Antenna of the present invention can reliablely and stablely be worked in the hyperfrequency frequency range.
The invention antenna can be widely used in detecting the local discharge signal of power equipment, particularly be used for detecting the local discharge signal of power transformer, can monitor the insulation property of power equipments such as power transformer effectively and accurately, be the monitoring equipment of guaranteeing the power system safety and stability operation.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the return loss plot figure of embodiment 1;
Fig. 4 is the normalization directivity curve figure of embodiment 1;
Fig. 5 is the peak gain curve chart of embodiment 1.
Among the figure: 1 dielectric substrate, 2 helical antennas, 3 rosettes, 4 coaxial fittings, 5 cone-shaped metal sheets, 6 coaxial fitting inner cores, R1 spiral inside radius size, R2 spiral outer radius size, the O dielectric substrate center of circle.
Embodiment
Below in conjunction with embodiment, further specify the present invention.
Shown in Fig. 1～2, a kind of single armed Archimedian spiral antenna of balun-free low-section mainly comprises dielectric substrate 1, helical antenna 2, rosette 3, coaxial fitting 4 etc.
The material of described dielectric substrate 1 adopts the FR-4 substrate for printed circuit board.Because the thickness of dielectric substrate 1 directly influences the impedance operator of antenna, for guaranteeing that antenna feed impedance maintains 50 Ω in 300MHz～3000MHz hyperfrequency frequency range (being the frequency range of the local discharge signal of power equipment such as power transformer), determines that by the calculating of antenna analysis software the thickness of described dielectric substrate 1 is 1mm.For the symmetry that guarantees antenna structure saves material simultaneously, described dielectric substrate 1 be shaped as circle, the diameter of described circle is 200mm.
Described helical antenna 2 adopts single armed Archimedian screw structure.The material of described helical antenna 2 is copper, for the spiral number of turns of the described helical antenna 2 of maximization of realizing the antenna receiving efficiency is 10 circles.The inside/outside diameter size of described spiral directly influences the bandwidth of operation of antenna, calculates the external diameter (2R that determines described spiral by moment Method Analysis
2) be the internal diameter (2R of 190mm, described spiral
1) be 30mm.The rotation direction of described spiral is dextrorotation, produces the right-handed circular polarization ripple.The cross section of described helical antenna 2 is rectangle, and for reducing the size of aerial loss resistance, the length of described rectangle is 3.5mm, and height is 70 μ m.For enlarging the effective bandwidth of antenna, the terminal cross section of described helical antenna 2 is decreased to a bit gradually.For guaranteeing that antenna can apex drive, the fixedly connected cone-shaped metal sheet 5 in the top of described helical antenna 2, the O place, the center of circle that the summit of described cone-shaped metal sheet 5 is positioned at described dielectric substrate 1 links to each other with coaxial fitting inner core 6.The cone angle size of described cone-shaped metal sheet 5 influences maximum gain and the central task frequency of antenna, and the material of described cone-shaped metal sheet 5 was defined as copper after optimization was analyzed, and cone angle is defined as 90 °, and bus length is 18.5mm, and thickness is 70 μ m.Described helical antenna 2 adopts printed circuit technology to be etched on the described dielectric substrate 1 to realize automation and the precise treatment of manufacturing process.
The diameter of described rosette 3 is that 60mm, thickness are 1mm, and the material of described rosette 3 is aluminium.Described rosette 3 be positioned at described dielectric substrate 1 under, the upper surface of described rosette 3 is 5mm apart from the distance of the lower surface of described dielectric substrate 1.
The model of described coaxial fitting 4 is commercial SMA-KWE.The periphery of described coaxial fitting 4 is fixed on the circle centre position of the lower surface of described rosette 3, and described coaxial fitting inner core 6 passes the center of circle of described rosette 3 and the center of circle of described dielectric substrate 1, and joins with described cone-shaped metal sheet 5.The reception signal of described helical antenna 2 transfers to the coaxial signal transmission line by described coaxial fitting 4.
A kind of single armed Archimedian spiral antenna of balun-free low-section, with embodiment 1, wherein:
The material of described dielectric substrate 1 adopts FR-4 substrate for printed circuit board CEM-3, and the thickness of described dielectric substrate 1 is 2mm.The spiral number of turns of described helical antenna 2 is 15 circles, and the rotation direction of described spiral is left-handed, produces the left-hand circular polarization ripple.The diameter of described rosette 3 is 40mm, and material is copper, and the upper surface of described rosette 3 is 3mm apart from the distance of the lower surface of described dielectric substrate 1.
Embodiment 3
A kind of single armed Archimedian spiral antenna of balun-free low-section, with embodiment 1, wherein:
The thickness of described dielectric substrate 1 is 1.5mm, described dielectric substrate 1 be shaped as circle, the diameter of described circle is 250mm.The spiral number of turns of described helical antenna 2 is 20 circles, the external diameter (2R of described spiral
2) be 240mm, the cone angle size of described cone-shaped metal sheet 5 is 120 °.The diameter of described rosette 3 is 80mm, and material is iron, and the upper surface of described rosette 3 is 8mm apart from the distance of the lower surface of described dielectric substrate 1.
Experimental result
Adopt the antenna parameters of present embodiment 1, by antenna simulation software its performance is analyzed, simulation result such as Fig. 3～shown in Figure 5.
Wherein Fig. 3 be present embodiment 1 in the return loss plot of 0.5～3GHz frequency range, wherein abscissa represents frequency variable, the GHz of unit; Ordinate represents return loss S
11The amplitude variable, the dB of unit.As can be seen from the figure, return loss is less than-10dB in 1.15GHz～2.4GHz frequency band range for antenna, and absolute bandwidth is greater than 1GHz, and antenna has very wide frequency bandwidth.
Fig. 4 is the right-handed polarized wave emulation normalized radiation pattern of present embodiment 1 on the 1.2GHz frequency, and as can be seen from the figure the greatest irradiation direction of antenna is in the antenna plane normal orientation, and the main lobe width of antenna is bigger.
Fig. 5 be present embodiment 1 at the peak gain curve chart of 0.51～3GHz frequency range, wherein abscissa represents frequency variable, the GHz of unit; Ordinate representative gain, the dB of unit.As shown in the figure, present embodiment 1 antenna gains greater than 5dB in 1.15GHz～2.4GHz frequency band.
From simulation result as can be seen the single armed Archimedian spiral antenna of balun-free low-section of the present invention can be operated in the hyperfrequency frequency range, in working band, has reasonable directivity, and have very high peak gain, can satisfy the basic demand of power equipment local discharge superhigh frequency detections such as power transformer.
Claims (1)
1. the single armed Archimedian spiral antenna of a balun-free low-section mainly comprises dielectric substrate (1), helical antenna (2), rosette (3), coaxial fitting (4), it is characterized in that:
It is FR-4 or CEM-3 that the material of described dielectric substrate (1) adopts the base material of printed circuit board (PCB), and the thickness of described dielectric substrate (1) is 0.5～2mm, is shaped as circle, and diameter is 150～250mm;
Described helical antenna (2) adopts single armed Archimedian screw structure, and material is copper, and the spiral number of turns of described helical antenna (2) is 8～20 circles, the external diameter (2R of described helical antenna (2)
2) be 140～240mm, internal diameter (2R
1) be 15～40mm, the rotation direction of described helical antenna (2) is left-handed or dextrorotation, the cross section of described helical antenna (2) is rectangle, the length of described rectangle is 2～5mm, height is 50～100 μ m, the terminal cross section of described helical antenna (2) is decreased to a bit gradually, the fixedly connected cone-shaped metal sheet in the top of described helical antenna (2) (5), the O place, the center of circle that the summit of described cone-shaped metal sheet (5) is positioned at described dielectric substrate (1) links to each other with coaxial fitting inner core (6), the cone angle size of described cone-shaped metal sheet (5) is 60 °～120 °, bus length is 9.5～25mm, thickness is 50～100 μ m, and described helical antenna (2) adopts printed circuit technology to be etched on the described dielectric substrate (1);
The material of described rosette (3) is copper or iron or aluminium, the diameter of described rosette (3) is that 30～90mm, thickness are 0.2～2mm, described rosette (3) be positioned at described dielectric substrate (1) under, the upper surface of described rosette (3) is 2～8mm apart from the distance of the lower surface of described dielectric substrate (1);
The model of described coaxial fitting (4) is commercial SMA-KWE or SMA-KFD6 or SMA-KFD7, the periphery of described coaxial fitting (4) is fixed on the circle centre position of the lower surface of described rosette (3), described coaxial fitting inner core (6) passes the center of circle of described rosette (3) and the center of circle of described dielectric substrate (1), and join with described cone-shaped metal sheet (5), the reception signal of described helical antenna (2) transfers to the coaxial signal transmission line by described coaxial fitting (4).
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103594786A (en) * | 2013-10-30 | 2014-02-19 | 航天恒星科技有限公司 | Miniaturization spiral PIFA antenna with UHF band |
| CN103777121A (en) * | 2014-01-22 | 2014-05-07 | 上海交通大学 | Multi-band ultrahigh frequency narrow band sensor for transformer substation local discharge detecting and positioning |
| CN103872450A (en) * | 2014-03-19 | 2014-06-18 | 安徽省广播电视科研所 | Thin-film digital television receiving antenna |
| CN103972642A (en) * | 2014-04-30 | 2014-08-06 | 江苏科技大学 | Groove helical antenna |
| CN104953260A (en) * | 2015-06-16 | 2015-09-30 | 华北电力大学（保定） | Broadband planar helical antenna for detecting partial discharge of electrical equipment and design method thereof |
| CN104991174A (en) * | 2015-07-26 | 2015-10-21 | 胡洁维 | Power station partial discharge signal detection system |
| CN105004977A (en) * | 2015-07-26 | 2015-10-28 | 胡洁维 | Transformer substation partial discharge signal detection system |
| CN105067971A (en) * | 2015-07-26 | 2015-11-18 | 胡洁维 | Substation discharge signal detection system |
| CN105067972A (en) * | 2015-07-26 | 2015-11-18 | 胡洁维 | 45-degree substation partial discharge signal detection system |
| CN105652167A (en) * | 2016-03-22 | 2016-06-08 | 黄旭 | Partial discharge signal detection system for communication-capable transformer substation |
| CN105004976B (en) * | 2015-07-26 | 2016-09-28 | 国网新疆电力公司哈密供电公司 | A kind of transformer station partial discharge signals detection device |
| CN116053792A (en) * | 2023-03-30 | 2023-05-02 | 山东科技大学 | Broadband antenna for partial discharge ultrahigh frequency signal detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103594786A (en) * | 2013-10-30 | 2014-02-19 | 航天恒星科技有限公司 | Miniaturization spiral PIFA antenna with UHF band |
| CN103594786B (en) * | 2013-10-30 | 2017-05-10 | 航天恒星科技有限公司 | Miniaturization spiral PIFA antenna with UHF band |
| CN103777121A (en) * | 2014-01-22 | 2014-05-07 | 上海交通大学 | Multi-band ultrahigh frequency narrow band sensor for transformer substation local discharge detecting and positioning |
| CN103872450A (en) * | 2014-03-19 | 2014-06-18 | 安徽省广播电视科研所 | Thin-film digital television receiving antenna |
| CN103972642A (en) * | 2014-04-30 | 2014-08-06 | 江苏科技大学 | Groove helical antenna |
| CN104953260A (en) * | 2015-06-16 | 2015-09-30 | 华北电力大学（保定） | Broadband planar helical antenna for detecting partial discharge of electrical equipment and design method thereof |
| CN105004977A (en) * | 2015-07-26 | 2015-10-28 | 胡洁维 | Transformer substation partial discharge signal detection system |
| CN105067971A (en) * | 2015-07-26 | 2015-11-18 | 胡洁维 | Substation discharge signal detection system |
| CN105067972A (en) * | 2015-07-26 | 2015-11-18 | 胡洁维 | 45-degree substation partial discharge signal detection system |
| CN104991174B (en) * | 2015-07-26 | 2016-09-28 | 南京联能电力检测研究所有限公司 | A kind of electric power station local discharge signal detecting system |
| CN105004976B (en) * | 2015-07-26 | 2016-09-28 | 国网新疆电力公司哈密供电公司 | A kind of transformer station partial discharge signals detection device |
| CN104991174A (en) * | 2015-07-26 | 2015-10-21 | 胡洁维 | Power station partial discharge signal detection system |
| CN105652167A (en) * | 2016-03-22 | 2016-06-08 | 黄旭 | Partial discharge signal detection system for communication-capable transformer substation |
| CN116053792A (en) * | 2023-03-30 | 2023-05-02 | 山东科技大学 | Broadband antenna for partial discharge ultrahigh frequency signal detection |
| CN116053792B (en) * | 2023-03-30 | 2023-07-11 | 山东科技大学 | Broadband antenna for partial discharge ultrahigh frequency signal detection |
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