CN214411526U - Radio frequency identification antenna unit and multi-band monitoring antenna device - Google Patents
Radio frequency identification antenna unit and multi-band monitoring antenna device Download PDFInfo
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- CN214411526U CN214411526U CN202120142052.8U CN202120142052U CN214411526U CN 214411526 U CN214411526 U CN 214411526U CN 202120142052 U CN202120142052 U CN 202120142052U CN 214411526 U CN214411526 U CN 214411526U
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Abstract
The utility model discloses a multi-band monitoring antenna device and a radio frequency identification antenna unit, wherein the multi-band monitoring antenna device comprises a fixed cylinder and at least two groups of array antennas; the first group of array antennas comprise at least two first antenna units, and each first antenna unit comprises two second substrates which are symmetrical to each other and a log-periodic antenna arranged on the second substrate; a first connecting part is arranged at the position, corresponding to the high-frequency phase end of the log periodic antenna, on the second substrate, and a second connecting part and a third connecting part are arranged at the position, corresponding to the low-frequency phase end of the log periodic antenna, on the second substrate; the two first connecting parts are fixedly connected, and the two second connecting parts and the two third connecting parts are connected to the top end and the bottom end of the fixed cylinder, so that the cross section of the first antenna unit is of a V-shaped structure; wherein the second set of array antennas comprises at least two second antenna elements. It is the antenna that can realize multifrequency section unmanned aerial vehicle simultaneous monitoring, and its size is little moreover wholly, light in weight, and it is more convenient to fix.
Description
Technical Field
The utility model relates to the technical field of communication technology, specifically a radio frequency identification antenna unit and multifrequency section monitoring antenna device.
Background
Along with the maturity of unmanned aerial vehicle technique, unmanned aerial vehicle's application scope is wider and wider. The unmanned aerial vehicle technology is applied to the application fields of homeland surveying and mapping, unmanned aerial vehicle remote sensing data acquisition and processing, environment monitoring, electric power inspection, agricultural plant protection, image aerial photography, photogrammetry and the like. Unmanned aerial vehicle has a great deal of advantages such as intelligent degree height, easily operation, cost are cheap relatively, and consumption level unmanned aerial vehicle's acquisition is also easier and easier. However, due to the lack of corresponding laws, regulations and control means, serious potential safety hazards and management loopholes are increasingly exposed when the unmanned aerial vehicle is used, and some lawless persons perform some illegal actions by using the unmanned aerial vehicle, so that accidents such as airplane delay in an airport, military ground monitoring, high-altitude throwing of dangerous objects and the like are caused, and serious practical threats are already formed on national safety, social stability and the like.
The anti-drone business has also emerged with the development of drone business. The unmanned aerial vehicle is difficult to reconnoiter due to the characteristics of low flying height, low flying speed, small size and the like. The monitoring of the unmanned aerial vehicle can be divided into an active mode and a passive mode. The passive monitoring has no electromagnetic pollution and is more environment-friendly. In the actual application of passive monitoring, unmanned aerial vehicle's model, kind are various. The transmission signal frequency channel of different unmanned aerial vehicles is inconsistent, under the unmanned aerial vehicle condition that appears simultaneously of the different frequency channels of transmission, the receiving channel scope in antenna and later stage is limited, so need receive the unmanned aerial vehicle signal of different frequency channels through the antenna of different frequency channels to come to carry out comprehensive monitoring to unmanned aerial vehicle.
SUMMERY OF THE UTILITY MODEL
Not enough to above-mentioned prior art, the utility model provides a radio frequency identification antenna unit and multifrequency section monitoring antenna device, this multifrequency section monitoring antenna device can realize the antenna of multifrequency section unmanned aerial vehicle simultaneous monitoring.
In order to achieve the above object, the present invention provides a radio frequency identification antenna unit, including a first substrate, on the first substrate:
the dipole antenna is arranged on the first substrate, a folded microstrip line is arranged in the middle of the dipole antenna, and tuning regions are arranged at two ends of the dipole antenna;
the balun circuit is provided with a first input end, a second input end, a first output end and a second output end, wherein the first input end and the second input end are respectively connected with a folded microstrip line of the dipole antenna, the first output end is connected with an inner conductor of an external coaxial line, and the second output end is connected with an outer conductor of the external coaxial line through the microstrip line.
In one embodiment, the first substrate has a rectangular structure, and four corners of the first substrate have chamfered structures.
In one embodiment, a first extending plate and a second extending plate are arranged on one long side of the first substrate at intervals, and both the first extending plate and the second extending plate are provided with mounting holes and positioning holes for fixedly mounting the first substrate on the antenna bracket.
In order to achieve the above object, the present invention further provides a multi-band monitoring antenna device, which comprises a hollow fixed cylinder and at least two sets of array antennas, wherein each set of array antennas is annular and coaxially arranged on the fixed cylinder;
the first group of array antennas comprise at least two first antenna units, and each first antenna unit comprises two second substrates which are symmetrical to each other and a log-periodic antenna arranged on the second substrates;
a first connecting part is arranged at the position, corresponding to the high-frequency phase end of the log periodic antenna, on the second substrate, and a second connecting part and a third connecting part are arranged at the position, corresponding to the low-frequency phase end of the log periodic antenna, on the second substrate;
in the same first antenna unit, the two first connecting parts are fixedly connected, the two second connecting parts are connected to the top end of the fixed cylinder at intervals, and the two third connecting parts are connected to the bottom end of the fixed cylinder at intervals, so that the cross section of the first antenna unit is in a V-shaped structure;
the second group of array antennas comprises at least two second antenna units, and the second antenna units are the radio frequency identification antenna units.
In one embodiment, a plurality of first mounting frames extending obliquely downwards are arranged at intervals along the circumferential direction at the top end of the fixed cylinder, and a plurality of second mounting frames extending obliquely upwards are arranged at intervals along the circumferential direction at the bottom end of the fixed cylinder;
the first mounting rack and the second mounting rack are in one-to-one correspondence with the second substrate, the second connecting portions on the second substrate are fixedly connected with the corresponding first mounting racks, and the third connecting portions on the second substrate are fixedly connected with the corresponding second mounting racks.
In one embodiment, in the same first antenna unit, the two second mounting brackets corresponding to the two third connecting parts are fixedly connected through a connecting rod.
In one embodiment, a fourth connecting portion is disposed on an edge of the second substrate between the second connecting portion and the third connecting portion, and the edge of the second substrate between the second connecting portion and the third connecting portion is attached to the sidewall of the fixed cylinder and is fixedly connected to the sidewall of the fixed cylinder through the fourth connecting portion.
In one embodiment, a second antenna unit is arranged between two adjacent first antenna units and between two second substrates in the same first antenna unit;
the top or the bottom of fixed section of thick bamboo are equipped with a plurality of third mounting brackets along circumference interval, third mounting bracket and second antenna unit one-to-one, first extension board, second extension board all link to each other with the third mounting bracket that corresponds is fixed.
In one embodiment, the fixed cylinder is provided with a wiring hole and a wiring groove for arranging the cables of the second antenna unit.
In one embodiment, the fixing cylinder is provided with an identification part corresponding to each first antenna unit and each second antenna unit.
Compared with the prior art, the utility model provides a pair of radio frequency identification antenna unit and multifrequency section monitoring antenna device has following beneficial effect:
1. the multi-band monitoring antenna device can receive and transmit signals of different frequency bands at the same time period;
2. the arrangement mode of the first antenna unit in the multi-band monitoring antenna device enables the phase center of high frequency to be at the front end, and the phase center of low frequency to be at the rear end, so that phase ambiguity can be prevented, and direction finding precision is improved; the arrangement of the array antenna realizes the omnibearing coverage of signals under the condition of small occupied area;
3. the second antenna unit in the multi-band monitoring antenna device adopts a folded microstrip line, so that the required frequency band requirement is maintained while the size is small; the multiple arrangement of the phase-shift-preventing device can prevent phase ambiguity;
4. the whole multi-band monitoring antenna device is small in size, light in weight and more convenient to fix.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an rfid antenna unit according to embodiment 1 of the present invention;
fig. 2 is an exploded schematic view of a multiband monitoring antenna device according to embodiment 2 of the present invention;
fig. 3 is a schematic view of a connection structure of two second substrates in embodiment 2 of the present invention;
fig. 4 is an axonometric view of the multiband monitoring antenna apparatus according to embodiment 2 of the present invention;
fig. 5 is a front view of a fixed cylinder in embodiment 2 of the present invention;
fig. 6 is a plan view of a fixed cylinder in embodiment 2 of the present invention.
Reference numerals: the antenna comprises a first substrate 101, a dipole antenna 102, a balun circuit 103, a folded microstrip line 104, a tuning region 105, a microstrip line 106, a first extension plate 107, a second extension plate 108, a mounting hole 109, a positioning hole 1010, a fixed cylinder 201, a second substrate 202, a log periodic antenna 203, a first mounting rack 204, a second mounting rack 205, a third mounting rack 206, a base 207, an identification part 208, a connecting rod 209, a connecting column 2010, a wiring hole 2011 and a wiring groove 2012.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection, physical connection or wireless communication connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
Example 1
Fig. 1 shows an rfid antenna unit disclosed in this embodiment, which includes a first substrate 101, a dipole antenna 102 disposed on the first substrate 101, and a balun circuit 103.
The dipole antenna 102 is disposed on the first substrate 101, and specifically, the middle of the dipole antenna 102 is disposed with the folded microstrip line 104, so that the area of the first substrate 101 can be utilized to the maximum extent, and the space occupied by the first substrate 101 is reduced; and tuning areas 105 are respectively arranged at two ends of the dipole antenna 102, so that the resonant frequency of the dipole antenna 102 is adjusted through the tuning areas 105.
The balun circuit 103 has a first input end, a second input end, a first output end and a second output end, wherein the first input end and the second input end are respectively connected to two symmetrical folded microstrip lines 104 on the dipole antenna 102, the first output end is connected to an inner conductor of an external coaxial line, and the second output end is connected to an outer conductor of the external coaxial line through a microstrip line 106.
In this embodiment, the first substrate 101 has a rectangular structure, and four corners of the first substrate 101 have a chamfered structure, so as to correspond to the two tuning regions 105 of the dipole antenna 102, thereby utilizing the area of the first substrate 101 to the maximum extent and reducing the space occupied by the first substrate 101.
In this embodiment, a first extending plate 107 and a second extending plate 108 are disposed on one long side of the first substrate 101 at an interval, and both the first extending plate 107 and the second extending plate 108 are disposed with a mounting hole 109 and a positioning hole 1010 for fixedly mounting the first substrate 101 on the antenna bracket. The first extending plate 107 is located in the middle of the first substrate 101, and the area of the first extending plate is larger than that of the second extending plate 108, so that the main mounting and fixing effects are achieved, the second extending plate 108 is located at the end of the first substrate 101, so that the auxiliary mounting and fixing effects are achieved, and shaking caused by external force after the first substrate 101 is mounted on the antenna bracket is avoided. And the microstrip line on the balun circuit 103 is arranged on the first extension board 107, so that the stable installation of the radio frequency line is ensured while the feeding and routing are facilitated.
Example 2
Fig. 2-6 show a multiband monitoring antenna apparatus disclosed in this embodiment, which includes a hollow fixed cylinder 201 and two sets of array antennas, each set of array antennas being annular and coaxially disposed on the fixed cylinder 201. The first group of array antennas are directional antennas, and the second group of array antennas are omnidirectional antennas, so that the multi-band monitoring antenna device can realize omnidirectional coverage and a good monitoring effect. In this embodiment, in order to achieve omnidirectional coverage and achieve a good monitoring effect, the placement angle of the antenna needs to be limited, and the limitation is as follows:
in the multi-band monitoring antenna device, the first array antenna comprises at least two first antenna elements, and the first antenna elements comprise two second substrates 202 which are symmetrical to each other and a log periodic antenna 203 arranged on the second substrate 202. In this embodiment, the second substrate 202 is an isosceles triangle structure. The position of the second substrate 202 corresponding to the high-frequency phase end of the log periodic antenna 203, i.e., the vertex angle of the isosceles triangle, is provided with a first connecting portion, and the position of the second substrate 202 corresponding to the low-frequency phase end of the log periodic antenna 203, i.e., the two base angles of the isosceles triangle, is provided with a second connecting portion and a third connecting portion. In same first antenna unit, two first connecting portions are fixed to be connected through a connecting structure, and two second connecting portions are connected at the top of a fixed section of thick bamboo 201 at interval, and two third connecting portions are connected at the bottom of a fixed section of thick bamboo 201 at interval to make first antenna unit's cross-section be V-arrangement structure. Specifically, first connecting portion, second connecting portion and third connecting plate are the solid fixed ring of establishing on second base plate 202 sideline, and connection structure is a spliced pole 2010, and this spliced pole 2010 both ends also are equipped with solid fixed ring respectively, and when two first connecting portions were connected to this spliced pole, its one end pasted with a first base plate 101 mutually, and the other end pastes with another second base plate 202 mutually to realize linking firmly through the cooperation of tightly deciding bolt and solid fixed ring.
Furthermore, a plurality of first mounting brackets 204 extending obliquely downwards are arranged at intervals along the circumferential direction at the top end of the fixed cylinder 201, and a plurality of second mounting brackets 205 extending obliquely upwards are arranged at intervals along the circumferential direction at the bottom end of the fixed cylinder 201; first mounting bracket 204, second mounting bracket 205 all with second base plate 202 one-to-one, the second connecting portion on the second base plate 202 are through tight set bolt and solid fixed ring's cooperation with the first mounting bracket 204 that corresponds fixedly continuous, the third connecting portion on the second base plate 202 are through tight set bolt and solid fixed ring's cooperation and the second mounting bracket 205 that corresponds fixedly continuous. After the first substrate 101 is connected to the fixing cylinder 201, an included angle between a central line of the log periodic antenna 203 on the first substrate 101 and a horizontal plane is 30-50 °, preferably, in the same first antenna unit, two second mounting brackets 205 corresponding to two third connecting portions are fixedly connected through a connecting rod 209, so that connection between two second substrates 202 of the same first antenna unit is more stable, consistency between the first antenna units is further ensured, and in order to realize fixation of a specific angle to achieve omnidirectional coverage, a better monitoring effect is achieved when the included angle between the central line of the log periodic antenna 203 and the horizontal plane is 30-50 °. The first mounting frame 204, the second mounting frame 205 and the fixed cylinder 201 may be integrally formed, bonded, bolted, glued, or fastened.
Further preferably, the edge that is located between second connecting portion and the third connecting portion on the second base plate 202 is equipped with the fourth connecting portion, and the edge that is located between second connecting portion and the third connecting portion on the second base plate 202 pastes with the lateral wall of a fixed section of thick bamboo 201 mutually and passes through the fixed linking to each other of the lateral wall of a fixed section of thick bamboo 201 of fourth connecting portion, further promotes the stability of being connected between second base plate 202 and a fixed section of thick bamboo 201, promotes the monitoring effect of first antenna element.
In the multi-band monitoring antenna apparatus, the second array antenna includes at least two second antenna units, and in this embodiment, the second antenna units are the rfid antenna units in embodiment 2. Preferably, there is one second antenna element between two adjacent first antenna elements, and between two second substrates 202 in the same first antenna element. And the top or bottom of the fixed cylinder 201 is provided with a plurality of third mounting brackets 206 at intervals along the circumferential direction, the third mounting brackets 206 are in one-to-one correspondence with the second antenna units, and the first extension plate 107 and the second extension plate 108 are fixedly connected with the corresponding third mounting brackets 206. One end of the third mounting frame 206 is fixed on the outer wall of the mounting cylinder in a Y shape, and the other free end is connected and fixed with the second antenna unit in an inclined downward manner, that is, the first extension plate 107 and the second extension plate 108 are respectively connected with the extending end in the inclined downward direction, so that the support required by the second antenna is provided while the material usage is minimized.
In this embodiment, the bottom end of the fixed cylinder 201 is provided with the base 207, the base 207 is circular ring-shaped, the base 207 is provided with a threaded hole, and the fixed cylinder 201 can be installed and fixed by the base 207. The fixed cylinder 201 is fixedly connected with the base 207, and the fixed cylinder and the base 207 are coaxially arranged. Alternatively, the fixing cylinder and the base 207 may be an integrally formed structure, and may also be fixed by bonding, screwing, or snapping. Preferably, the fixed cylinder 201 is provided with an identification portion 208 corresponding to each first antenna unit and each second antenna unit, the identification portion is a digital label, and when the antenna fails, the failed antenna can be found out directly corresponding to the digital label, and the antenna can be maintained or replaced.
In this embodiment, the fixed barrel 201 is provided with a wire-routing hole 2011 and a wire-routing groove 2012, wherein the wire-routing hole 2011 is located on the partition board inside the fixed barrel 201, the wire-routing groove 2012 is located at the top end of the fixed barrel, and the wire-routing hole 2011 and the wire-routing groove 2012 are arranged corresponding to the second antenna unit, that is, the cable of the second antenna unit passes through the partition board inside the fixed barrel 201 via the wire-routing hole 2011 after passing through the wire-routing groove 2012, and finally passes through the base 207. The wire arrangement holes 2011 and the wire arrangement grooves 2012 are arranged to ensure that the wires of the second antenna unit are clear, so that interference can not be generated in installation of other parts, the wire arrangement holes 2011 can limit the length of the radio frequency wire of the second antenna unit except that the wire can pass through along a specified position, and the problem that the received signals are asynchronous due to different wire lengths and the later-stage calculation result is influenced is avoided.
In this embodiment, the frequency range of the first group of array antennas is 700MHz-6GHz, and the second group of array antennas is 315MHz-700MHz antennas.
Example 3
The present embodiment also discloses a multi-band monitoring antenna apparatus, which is different from embodiment 2 in that the multi-band monitoring antenna apparatus has three sets of array antennas. The layout of the first and second groups of array antennas is the same as that of embodiment 2, in this embodiment, on the basis of embodiment 2, a third group of array antennas is further disposed on the solid cylinder, where the group of array antennas includes at least two third antenna units, the second antenna units in embodiment 2 are circumferentially spaced at the top end of the fixed cylinder 201, the number of the third antenna units in this embodiment corresponds to that of the second antenna units one to one, and the third antenna units are circumferentially spaced at the bottom end of the fixed cylinder 201, as for the specific structure of the third antenna units, an existing antenna board on the market may be adopted, and this embodiment is not limited thereto.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. An RFID antenna unit, comprising a first substrate, disposed on the first substrate:
the dipole antenna is arranged on the first substrate, a folded microstrip line is arranged in the middle of the dipole antenna, and tuning regions are arranged at two ends of the dipole antenna;
the balun circuit is provided with a first input end, a second input end, a first output end and a second output end, wherein the first input end and the second input end are respectively connected with a folded microstrip line of the dipole antenna, the first output end is connected with an inner conductor of an external coaxial line, and the second output end is connected with an outer conductor of the external coaxial line through the microstrip line.
2. The radio frequency identification antenna unit of claim 1, wherein the first substrate is rectangular in configuration and four corners of the first substrate are chamfered.
3. The radio frequency identification antenna unit as claimed in claim 2, wherein a first extending plate and a second extending plate are spaced apart from each other on one long side of the first substrate, and each of the first extending plate and the second extending plate has a mounting hole and a positioning hole for fixedly mounting the first substrate on the antenna bracket.
4. A multi-band monitoring antenna device is characterized by comprising a hollow fixed cylinder and at least two groups of array antennas, wherein each group of array antennas is annular and is coaxially arranged on the fixed cylinder;
the first group of array antennas comprise at least two first antenna units, and each first antenna unit comprises two second substrates which are symmetrical to each other and a log-periodic antenna arranged on the second substrates;
a first connecting part is arranged at the position, corresponding to the high-frequency phase end of the log periodic antenna, on the second substrate, and a second connecting part and a third connecting part are arranged at the position, corresponding to the low-frequency phase end of the log periodic antenna, on the second substrate;
in the same first antenna unit, the two first connecting parts are fixedly connected, the two second connecting parts are connected to the top end of the fixed cylinder at intervals, and the two third connecting parts are connected to the bottom end of the fixed cylinder at intervals, so that the cross section of the first antenna unit is in a V-shaped structure;
wherein the second set of array antennas comprises at least two second antenna elements, the second antenna elements being the radio frequency identification antenna elements of claim 3.
5. The multiband monitoring antenna apparatus of claim 4, wherein the top end of the fixed cylinder is circumferentially spaced apart from a plurality of first mounting brackets extending obliquely downward, and the bottom end of the fixed cylinder is circumferentially spaced apart from a plurality of second mounting brackets extending obliquely upward;
the first mounting rack and the second mounting rack are in one-to-one correspondence with the second substrate, the second connecting portions on the second substrate are fixedly connected with the corresponding first mounting racks, and the third connecting portions on the second substrate are fixedly connected with the corresponding second mounting racks.
6. The multiple band-monitoring antenna apparatus of claim 5, wherein said two second mounting brackets corresponding to said two third connecting portions are fixedly connected to each other by a connecting rod in the same first antenna unit.
7. The multiple band monitoring antenna assembly of claim 5, wherein a fourth connecting portion is disposed on the second substrate at a side between the second connecting portion and the third connecting portion, and the side of the second substrate between the second connecting portion and the third connecting portion is attached to the sidewall of the fixed cylinder and is fixedly connected to the sidewall of the fixed cylinder through the fourth connecting portion.
8. The multiple band monitoring antenna apparatus of claim 4, 5 or 6, wherein there is a second antenna element between two adjacent first antenna elements, and between two second substrates in the same first antenna element;
the top or the bottom of fixed section of thick bamboo are equipped with a plurality of third mounting brackets along circumference interval, third mounting bracket and second antenna unit one-to-one, first extension board, second extension board all link to each other with the third mounting bracket that corresponds is fixed.
9. The multiple band monitoring antenna apparatus of claim 4, 5 or 6, wherein said fixed cylinder is provided with a wire routing hole and a wire routing groove for arranging the cable of the second antenna unit.
10. The multiple band monitoring antenna apparatus of claim 4, 5 or 6, wherein the fixing cylinder is provided with a marking portion corresponding to each of the first antenna elements and the second antenna elements.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120142052.8U CN214411526U (en) | 2021-01-19 | 2021-01-19 | Radio frequency identification antenna unit and multi-band monitoring antenna device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120142052.8U CN214411526U (en) | 2021-01-19 | 2021-01-19 | Radio frequency identification antenna unit and multi-band monitoring antenna device |
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| CN214411526U true CN214411526U (en) | 2021-10-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115616479A (en) * | 2022-12-19 | 2023-01-17 | 成都空御科技有限公司 | Fixed unmanned aerial vehicle monitoring facilities and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115616479A (en) * | 2022-12-19 | 2023-01-17 | 成都空御科技有限公司 | Fixed unmanned aerial vehicle monitoring facilities and system |
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