CN216903341U

CN216903341U - Access door antenna

Info

Publication number: CN216903341U
Application number: CN202220360655.XU
Authority: CN
Inventors: 秦瑞峰
Original assignee: Kreet Communication Co ltd
Current assignee: Kreet Communication Co ltd
Priority date: 2022-02-23
Filing date: 2022-02-23
Publication date: 2022-07-05
Anticipated expiration: 2032-02-23

Abstract

The utility model relates to a channel door antenna, which comprises a bottom plate, a coaxial cable, a branching unit and 2 vibrators, wherein the coaxial cable is connected with the branching unit; each vibrator is a circular metal sheet, a rectangular hole is formed in each of the two sides of the circle center of each vibrator, and the central axes of the 2 rectangular holes are collinear and penetrate through the circle center of each vibrator; a connecting hole is formed on the vibrator, and an included angle A formed by a connecting line of the hole center of the connecting hole and the circle center of the vibrator and the central axis of the rectangular hole is 45 +/-1 degrees; each vibrator is connected with the bottom plate through a first insulating column, and the bottom plate is made of a metal conductor; the shunt is arranged on the bottom plate and is positioned among the 2 vibrators; the coaxial cable comprises a main cable and 2 shunt cables, a cable connector is installed at one end of the main cable, the other end of the main cable is simultaneously connected with one end of the 2 shunt cables through a shunt, one shunt cable corresponds to a vibrator, an inner conductor at the other end of the shunt cable is communicated with a connecting hole of the vibrator, and an outer conductor at the other end of the shunt cable is communicated with the bottom plate.

Description

Access door antenna

Technical Field

The utility model relates to the technical field of antennas, in particular to an access door antenna.

Background

The RFID is a non-contact automatic identification, which automatically identifies a target object and obtains related data through a radio frequency signal, and the identification work does not need manual intervention. The existing access doors are generally provided with RFID antennas for identifying passing objects and facilitating tracking of the paths of the objects; the conventional RFID antenna has a small radiation area, and a large number of RFID antennas are required to be installed when the access door works normally, so that the cost is high; in addition, the oscillator in the existing RFID antenna is usually fixed on the bottom plate through a bracket, which results in that the existing RFID antenna occupies a large space, has a heavy weight, and is very inconvenient to install.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a channel door antenna which has the advantages of simple structure, reasonable design, larger radiation area, small occupied space, lighter weight and the like.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a channel door antenna comprises a bottom plate, a coaxial cable, a splitter and 2 vibrators; each vibrator is a circular metal sheet with the thickness D1 of 1 +/-0.1 mm and the radius R of 76.5 +/-0.2 mm, a rectangular hole is formed on each of the two sides of the circle center of each vibrator, the length L1 of each rectangular hole is 57 +/-0.2 mm, the width W1 of each rectangular hole is 8.5 +/-0.1 mm, the central axes of the 2 rectangular holes are collinear and penetrate through the circle center of each vibrator, and the vertical distance D2 between each rectangular hole on each vibrator and the circle center of each rectangular hole is 10 +/-0.1 mm; a connecting hole is formed in the vibrator, the distance D3 between the hole center of the connecting hole and the circle center of the vibrator is 31 +/-0.2 mm, and the included angle A formed by the connecting line of the hole center of the connecting hole and the circle center of the vibrator and the central axis of the rectangular hole is 45 +/-1 degrees; each vibrator is connected with the bottom plate through a first insulating column, the bottom plate is made of metal conductors, and the distance D4 between the circle centers of the 2 vibrators is 190 +/-1 mm; the shunt is arranged on the bottom plate and is positioned among the 2 vibrators; the coaxial cable comprises a main cable and 2 shunt cables, a cable connector is installed at one end of the main cable, the other end of the main cable is simultaneously connected with one end of each of the 2 shunt cables through a shunt, each shunt cable corresponds to a vibrator, an inner conductor at the other end of each shunt cable is communicated with a connecting hole of each vibrator, and an outer conductor at the other end of each shunt cable is communicated with the bottom plate.

Furthermore, the access door antenna further comprises 2 positioning brackets, each positioning bracket is made of a metal conductor, and a through hole is formed in each positioning bracket; a positioning bracket corresponds to a vibrator and a shunt cable; the positioning bracket is positioned between the vibrator and the bottom plate and is connected with the bottom plate; the inner conductor of the shunt cable penetrates through the through hole of the positioning support to be connected and conducted with the connecting hole of the vibrator, and the outer conductor of the shunt cable is conducted with the positioning support.

Furthermore, the access door antenna as described above further includes a positioning clip, and the main cable of the coaxial cable is fixed to the bottom plate by the positioning clip.

Furthermore, as for the above access door antenna, each positioning bracket is further formed with a plurality of first via holes, the splitter is formed with a plurality of second via holes, and the positioning clip is formed with a plurality of third via holes; the bottom plate is made of aluminum materials, and a plurality of positioning studs, a plurality of mounting studs and a plurality of wire clamp studs are integrally formed on the bottom plate; the wire clamp also comprises a plurality of positioning nuts, a plurality of mounting nuts and wire clamp nuts; a first through hole corresponds to a positioning stud and a positioning nut, and one end of the positioning stud is in threaded connection with the positioning nut after passing through the first through hole; a second through hole corresponds to a mounting stud and a mounting nut, and one end of the mounting stud is in threaded connection with the mounting nut after passing through the second through hole; and a third through hole corresponds to a wire clamp stud and a wire clamp nut, and one end of the wire clamp stud is in threaded connection with the wire clamp stud after passing through the third through hole.

Further, according to the above described access door antenna, each element is fixedly connected to the bottom plate at the center of the element through the first insulating column.

Furthermore, as for the above-mentioned channel door antenna, each of the oscillators is formed with 3 fixing holes arranged around the center of the oscillator, and the distance D5 between the center of the hole of the fixing hole and the center of the oscillator is 63 ± 0.2 mm; each fixing hole of the vibrator is fixedly connected with the bottom plate through a second insulating column.

Furthermore, according to the above-mentioned channel door antenna, the two opposite side edges of the bottom plate are respectively bent to form folded edges, each folded edge is perpendicular to the bottom plate, 2 oscillators are arranged in the length direction of the folded edges, the oscillators are located between the 2 folded edges, and the vertical distance D6 between each folded edge and the center of the oscillator is 88.5 ± 0.2 mm; the heights H1 of the first insulating column and the second insulating column are both 13 +/-0.2 mm, and the height H2 of the folded edge is 13.3 +/-0.2 mm.

Further, in the above described access door antenna, the length L2 of the bottom plate is 360 ± 1mm, the width W2 of the bottom plate is 180 ± 1mm, and the thickness D7 of the bottom plate is 1.5 ± 0.1 mm.

The technical scheme of the utility model has the following beneficial effects: the utility model adopts the vibrators with specific shapes and sizes and the arrangement and matching of 2 vibrators, so that the utility model obtains the following electrical indexes: frequency range: 902-928 MHz, gain: 10dBi, lobe width: 75 degrees of Hor, 45 degrees of Ver and a polarization mode: circular polarization, voltage standing wave ratio: less than or equal to 1.3, front-to-back ratio: not less than 20, impedance: 50 Ω, maximum input power: 100W; the coaxial cable is simultaneously connected with 2 oscillators in a feed manner through the shunt, so that on one hand, the circuit layout of the coaxial cable is more reasonable, the installation difficulty is reduced, and on the other hand, the radiation range of the coaxial cable can be enlarged; in addition, because the vibrator is in a structure of a round metal sheet with the thickness D1 of 1 +/-0.1 mm and the radius R of 76.5 +/-0.2 mm, the vibrator can be fixed on the bottom plate only by using a first insulating column during assembly, the weight and the occupied space of the vibrator are effectively reduced, the assembly is convenient, and the production cost is saved; the novel structure of this realization is simple, reasonable in design, area of radiation is great, occupation space is little, weight is lighter, can effectively reduce installation cost.

Drawings

FIG. 1 is a schematic perspective view of an embodiment;

FIG. 2 is an assembly view of the embodiment;

FIG. 3 is a front view of the embodiment;

FIG. 4 is a left side view of the embodiment;

FIG. 5 is a front view of the vibrator of the embodiment;

FIG. 6 is a schematic perspective view of a base plate according to an embodiment;

FIG. 7 is a VSWR state diagram for an embodiment in use;

FIG. 8 is a horizontal plane pattern of the embodiment in use;

FIG. 9 is a vertical plane directional diagram of the embodiment in use;

description of reference numerals:

1-a bottom plate; 11-positioning studs; 12-mounting studs; 13-a clamp stud; 14-folding edges; 2-a vibrator; 21-a rectangular hole; 22-connecting hole; 23-a central hole; 24-a fixation hole; 3-a coaxial cable; 31-main cable; 32-branch cables; 33-cable joint; 4-a first insulating column; 41-a first bolt; 5-a second insulating column; 51-a second bolt; 6-positioning the bracket; 61-positioning nut; 7-a splitter; 71-mounting a nut; 8, positioning a wire clamp; 81-clamp nut.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

An access door antenna of the embodiment shown in fig. 1 to 6 comprises a bottom plate 1, a coaxial cable 3, a

splitter

7 and 2 oscillators 2; each vibrator 2 is a circular metal sheet with the thickness D1 of 1 +/-0.1 mm and the radius R of 76.5 +/-0.2 mm, rectangular holes 21 are formed in the two sides of the circle center of each vibrator 2, the length L1 of each rectangular hole 21 is 57 +/-0.2 mm, the width W1 of each rectangular hole 21 is 8.5 +/-0.1 mm, the central axes of the 2 rectangular holes 21 are collinear and penetrate through the circle center of each vibrator 2, and the vertical distance D2 between each rectangular hole 21 and the circle center of each vibrator 2 is 10 +/-0.1 mm; a connecting hole 22 is formed in the vibrator 2, the distance D3 between the hole center of the connecting hole 22 and the circle center of the vibrator 2 is 31 +/-0.2 mm, and the included angle A formed by the connecting line of the hole center of the connecting hole 22 and the circle center of the vibrator 2 and the central axis of the rectangular hole 21 is 45 +/-1 degrees; each vibrator 2 is connected with the bottom plate 1 through a first insulating column 4, the bottom plate 1 is made of metal conductors, and the distance D4 between the circle centers of the 2 vibrators 2 is 190 +/-1 mm; the shunt 7 is arranged on the bottom plate 1, and the shunt 7 is arranged among the 2 vibrators 2; the coaxial cable 3 comprises a

main cable

31 and 2 shunt cables 32, a cable connector 33 is installed at one end of the main cable 31, the other end of the main cable 31 is simultaneously connected with one end of the 2 shunt cables 32 through a shunt 7 in a feed mode, one shunt cable 32 corresponds to one vibrator 2, an inner conductor at the other end of the shunt cable 32 is communicated with a connecting hole 22 of the vibrator 2, and an outer conductor at the other end of the shunt cable 32 is communicated with the bottom plate 1.

The utility model adopts the vibrators 2 with specific shapes and sizes and the arrangement and matching of 2 vibrators 2, so that the utility model obtains the following electrical indexes: frequency range: 902-928 MHz, gain: 10dBi, lobe width: 75% of Hor, 45% of Ver and a polarization mode: circular polarization, voltage standing wave ratio: less than or equal to 1.3, front-to-back ratio: not less than 20, impedance: 50 Ω, maximum input power: 100W; the coaxial cable 3 is simultaneously connected with the 2 vibrators 2 in a feed way through the shunt 7, so that on one hand, the circuit layout of the utility model is more reasonable, the installation difficulty is reduced, and on the other hand, the radiation range of the utility model can be enlarged; in addition, because the vibrator 2 is in a structure of a round metal sheet with the thickness D1 of 1 +/-0.1 mm and the radius R of 76.5 +/-0.2 mm, the vibrator can be fixed on the bottom plate 1 only by using the first insulating column 4 during assembly, the weight and the occupied space of the utility model are effectively reduced, the assembly is convenient, and the production cost is saved; the novel structure of this realization is simple, reasonable in design, area of radiation is great, occupation space is little, weight is lighter, can effectively reduce installation cost. The above design can provide the VSWR state diagram shown in fig. 7, the horizontal plane pattern shown in fig. 8, and the vertical plane pattern shown in fig. 9 when the tunnel gate antenna is used.

As shown in fig. 2 and 4, the channel door antenna further includes 2 positioning brackets 6, each positioning bracket 6 is made of a metal conductor, and a through hole is formed on the positioning bracket 6; a positioning bracket 6 corresponds to the vibrator 2 and the shunt cable 32; the positioning bracket 6 is positioned between the vibrator 2 and the bottom plate 1, and the positioning bracket 6 is connected with the bottom plate 1; the inner conductor of the shunt cable 32 passes through the through hole of the positioning bracket 6 to be connected and conducted with the connection hole 22 of the vibrator 2, and the outer conductor of the shunt cable 32 is conducted with the positioning bracket 6. Such a design may provide more robust installation of the shunt cable 32 and improved stability.

As shown in fig. 1 to 3, the tunnel door antenna further includes a positioning clip 8, and the main cable 31 of the coaxial cable 3 is fixed on the bottom plate 1 through the positioning clip 8. Such a design may provide more secure mounting of the main cable 31 and improved stability.

As shown in fig. 1, 2, 3 and 6, each positioning bracket 6 is further formed with a plurality of first through holes, the splitter 7 is formed with a plurality of second through holes, and the positioning clamp 8 is formed with a plurality of third through holes; the bottom plate 1 is made of aluminum, and a plurality of positioning studs 11, a plurality of mounting studs 12 and a plurality of wire clamp studs 13 are integrally formed on the bottom plate 1; the wire clamp also comprises a plurality of positioning nuts 61, a plurality of mounting nuts 71 and a wire clamp nut 81; a first through hole corresponds to a positioning stud 11 and a positioning nut 61, and one end of the positioning stud 11 passes through the first through hole and then is in threaded connection with the positioning nut 61; a second through hole corresponds to the mounting stud 12 and the mounting nut 71, and one end of the mounting stud 12 passes through the second through hole and then is in threaded connection with the mounting nut 71; a third through hole corresponds to a wire clamp stud 13 and a wire clamp nut 81, and one end of the wire clamp stud 13 passes through the third through hole and then is in threaded connection with the wire clamp stud 13. Because the positioning studs 11, the mounting studs 12 and the wire clamp studs 13 are integrally formed by the bottom plate 1, the positioning support 6, the shunt 7 and the positioning wire clamp 8 can be more conveniently mounted and dismounted by the design, and the maintenance difficulty is reduced.

As shown in fig. 1 to 6, each vibrator 2 is fixedly connected to the base plate 1 at the center of the vibrator through the first insulating post 4. The implementation also comprises a plurality of first bolts 41, a center hole 23 is formed on the circle center of each vibrator 2, one end of a first insulating column 4 is fixedly connected with the bottom plate 1, a first screw hole is formed on the other end of the first insulating column 4, one first bolt 41 corresponds to one center hole 23 and one first insulating column 4, and one end of the first bolt 41 penetrates through the center hole 23 and then is locked into the first screw hole, so that the vibrators 2 are fixed; the design can ensure that the vibrator 2 is more stably installed and the stability is improved.

As shown in fig. 1 to 6, each vibrator 2 is formed with 3 fixing holes 24 arranged around the center thereof, and the distance D5 between the center 2 of the fixing hole 24 and the center of the vibrator 2 is 63 mm; each fixing hole 24 of the vibrator 2 is fixedly connected with the bottom plate 1 through a second insulating column 5. The embodiment also comprises a plurality of second bolts 51, one end of the second insulating column 5 is fixedly connected with the bottom plate 1, a second screw hole is formed in the other end of the second insulating column 5, one second bolt 51 corresponds to one fixing hole 24 and one second insulating column 5, and one end of the second bolt 51 penetrates through the fixing hole 24 and then is locked into the second screw hole; due to the design, the oscillator 2 can be installed more stably, and the stability is improved.

As shown in fig. 1, 3, 4 and 6, folded edges 14 are formed by bending two opposite side edges of a bottom plate 1, each folded edge 14 is perpendicular to the

bottom plate

1, 2 vibrators 2 are arranged along the length direction of the folded edge 14, the vibrators 2 are arranged between the 2 folded edges 14, and the vertical distance D6 between each folded edge 14 and the circle center of each vibrator 2 is 88.5 mm; the heights H1 of the first insulating column 4 and the second insulating column 5 are both 13mm, and the height H2 of the folded edge 14 is 13.3 mm. When the channel door antenna works, the folded edge 1414 plays a role in narrowing the wave beam, which is beneficial to reducing the phenomenon of misreporting and misreading of the channel door provided with the channel door antenna.

As shown in FIGS. 3 and 4, the length L2 of the base plate 1 is 360mm, the width W2 of the base plate 1 is 180mm, and the thickness D7 of the base plate 1 is 1.5 mm. Such design makes bottom plate 1's structure more reasonable, reduces this passageway door antenna's occupation volume, reduces the installation degree of difficulty.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, as it will be apparent to those skilled in the art that various modifications, combinations and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An access door antenna, comprising: the device comprises a bottom plate, a coaxial cable, a splitter and 2 vibrators; each vibrator is a circular metal sheet with the thickness D1 of 1 +/-0.1 mm and the radius R of 76.5 +/-0.2 mm, a rectangular hole is formed on each of the two sides of the circle center of each vibrator, the length L1 of each rectangular hole is 57 +/-0.2 mm, the width W1 of each rectangular hole is 8.5 +/-0.1 mm, the central axes of the 2 rectangular holes are collinear and penetrate through the circle center of each vibrator, and the vertical distance D2 between each rectangular hole on each vibrator and the circle center of each rectangular hole is 10 +/-0.1 mm; a connecting hole is formed in the vibrator, the distance D3 between the hole center of the connecting hole and the circle center of the vibrator is 31 +/-0.2 mm, and the included angle A formed by the connecting line of the hole center of the connecting hole and the circle center of the vibrator and the central axis of the rectangular hole is 45 +/-1 degrees; each vibrator is connected with the bottom plate through a first insulating column, the bottom plate is made of metal conductors, and the distance D4 between the circle centers of the 2 vibrators is 190 +/-1 mm; the shunt is arranged on the bottom plate and is positioned among the 2 vibrators; the coaxial cable comprises a main cable and 2 shunt cables, a cable connector is installed at one end of the main cable, the other end of the main cable is simultaneously connected with one end of each of the 2 shunt cables through a shunt, each shunt cable corresponds to a vibrator, an inner conductor at the other end of each shunt cable is communicated with a connecting hole of each vibrator, and an outer conductor at the other end of each shunt cable is communicated with the bottom plate.

2. An access door antenna as recited in claim 1, wherein: the positioning device also comprises 2 positioning brackets, each positioning bracket is made of a metal conductor, and a through hole is formed in each positioning bracket; a positioning bracket corresponds to a vibrator and a shunt cable; the positioning bracket is positioned between the vibrator and the bottom plate and connected with the bottom plate; the inner conductor of the shunt cable penetrates through the through hole of the positioning support to be connected and conducted with the connecting hole of the vibrator, and the outer conductor of the shunt cable is conducted with the positioning support.

3. An access door antenna as recited in claim 2, wherein: the coaxial cable is characterized by further comprising a positioning wire clamp, and a main cable of the coaxial cable is fixed on the bottom plate through the positioning wire clamp.

4. An access door antenna as claimed in claim 3, wherein: a plurality of first through holes are formed in each positioning bracket, a plurality of second through holes are formed in the branching unit, and a plurality of third through holes are formed in the positioning wire clamp; the bottom plate is made of aluminum materials, and a plurality of positioning studs, a plurality of mounting studs and a plurality of wire clamp studs are integrally formed on the bottom plate; the wire clamp also comprises a plurality of positioning nuts, a plurality of mounting nuts and wire clamp nuts; a first through hole corresponds to a positioning stud and a positioning nut, and one end of the positioning stud is in threaded connection with the positioning nut after passing through the first through hole; a second through hole corresponds to a mounting stud and a mounting nut, and one end of the mounting stud is in threaded connection with the mounting nut after passing through the second through hole; and a third through hole corresponds to a wire clamp stud and a wire clamp nut, and one end of the wire clamp stud is in threaded connection with the wire clamp stud after passing through the third through hole.

5. An access door antenna as recited in claim 1, wherein: and the center of each vibrator is fixedly connected with the bottom plate through the first insulating column.

6. An access door antenna as recited in claim 5, wherein: each vibrator is provided with 3 fixing holes distributed around the circle center of the vibrator, and the distance D5 between the hole center of each fixing hole and the circle center of the vibrator is 63 +/-0.2 mm; each fixing hole of the vibrator is fixedly connected with the bottom plate through a second insulating column.

7. An access door antenna as claimed in claim 6, wherein: the two opposite side edges of the bottom plate are bent to form folded edges, each folded edge is perpendicular to the bottom plate, the 2 vibrators are arranged in the length direction of the folded edges and are positioned among the 2 folded edges, and the vertical distance D6 between each folded edge and the circle center of each vibrator is 88.5 +/-0.2 mm; the heights H1 of the first insulating column and the second insulating column are both 13 +/-0.2 mm, and the height H2 of the folded edge is 13.3 +/-0.2 mm.

8. An access door antenna as recited in claim 7, wherein: the length L2 of bottom plate is 360 +/-1 mm, and the width W2 of bottom plate is 180 +/-1 mm, and the thickness D7 of bottom plate is 1.5 +/-0.1 mm.