CN218482398U - Ultra-wideband FPC antenna - Google Patents
Ultra-wideband FPC antenna Download PDFInfo
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- CN218482398U CN218482398U CN202222633109.1U CN202222633109U CN218482398U CN 218482398 U CN218482398 U CN 218482398U CN 202222633109 U CN202222633109 U CN 202222633109U CN 218482398 U CN218482398 U CN 218482398U
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Abstract
The utility model discloses an ultra wide band FPC antenna, including radiation piece, flexible dielectric plate, coplane ground and coplane microstrip line, radiation piece, coplane ground, coplane microstrip line all print on the flexible dielectric plate and all establish on the same surface of flexible dielectric plate; the radiation sheet is connected with the coplanar microstrip line, the coplanar ground surrounds the outer side of the coplanar microstrip line, and a coplanar gap is reserved between the radiation sheet and the coplanar microstrip line; meanwhile, a gap is reserved between the radiation sheet and the coplanar ground; and a plurality of microstrip feed lines are arranged on the radiation sheet and are connected with the coplanar microstrip lines. An FPC flexible board (polyimide) is adopted to be attached to the inner wall of the terminal equipment shell, the width of an antenna radiation sheet is the same as that of a coplanar ground, and the width of an antenna is greatly reduced; the ultra-wideband FPC antenna is very suitable for being used in ultra-wideband positioning full-screen watch label terminal equipment.
Description
Technical Field
The utility model relates to a flexible ultra wide band antenna technical field, concretely relates to ultra wide band FPC antenna.
Background
The global four-large satellite navigation system can carry out accurate positioning in outdoor open environment, but basically loses the positioning capability in indoor environment shielded by buildings. People are active indoors for about 80% of the time, and therefore, an indoor positioning and navigation service has a wide demand. UWB (ultra wide band) is an emerging indoor positioning technology in recent years, and the system utilizes ultra wide band pulse signals to carry out information transmission, and has congenital advantages in the aspects of multipath resistance, low complexity, time synchronization and the like. Ultra Wide Band (UWB) technology is a new type of short-range high-rate wireless communication technology, and the specified relative bandwidth is greater than 20% or the absolute bandwidth is greater than 500MHz.
Indoor location usually has personnel's location and goods and materials location, and goods and materials location label size is great usually, and built-in antenna available space is also more, but is less to personnel's location full screen wrist-watch label equipment size, and built-in antenna available space is also very little, and especially full screen wrist-watch label equipment requires littleer to built-in antenna size.
The built-in antenna mainly comprises a ceramic antenna, a PCB antenna, a flexible antenna (FPC antenna) and an LDS antenna, wherein the ceramic antenna and the PCB antenna are large in size and are not suitable for full-screen watch label equipment, the LDS antenna has the greatest advantage of saving space and is suitable for full-screen watch label equipment, but the ultra-wideband antenna requires a bandwidth larger than 500MHz, the LDS antenna is not easy to realize, particularly the LDS antenna is expensive in design and processing cost, and is not suitable for equipment in large batch. The flexible antenna has the advantages that the cost is low, the ultra-wideband bandwidth is easy to realize, the antenna is directly attached to the inner wall of the shell, and the inner space of a terminal device product is saved.
Chinese patent document (CN 212571344U) discloses a wearable flexible ultra-wideband dual-notch antenna, which works in a UWB frequency band (3.1 GHz-10.6 GHz), a medium plate adopts flexible material felt, and the size of the medium plate is 45mm × 31.5mm × 2mm. The technical scheme has the advantages that the low frequency is 3.1GHz (the half wavelength is 48.35 mm), the maximum size of the antenna is 45mm 31.5mm 2mm (the area is 1417.5 mm) 2 ) The areas are different 1265, and the felt medium is used, so the technical scheme can not be used for a watch terminal product with a full screen at all regardless of the size of the antenna or the medium.
Chinese patent document (CN 114696097A) discloses a UWB antenna and wearable device, where the operating frequency band of the antenna is 3.07GHz-10.8GHz, and meets the operating frequency band, but the size of the antenna dielectric plate of the technical scheme is 24mm 25.5mm 0.4mm, the internal length and width of the upper case of a general watch is about 40.3mm 32.4mm, and the length of the screen of a full-screen watch is about 33mm, and the screen cannot cover the antenna, so the size of the antenna of the technical scheme is also not applicable to a watch terminal product of the full screen.
Because the ultra-wideband terminal wrist strap type positioning tag has a full screen, an antenna which meets the requirements of small size, ultra-wideband and low cost is needed, so that the available clearance area of the antenna is very small.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an ultra wide band FPC antenna reduces the space, reduces the antenna size, makes this ultra wide band FPC antenna be applicable to ultra wide band terminal wrist strap formula location label.
In order to solve the technical problem, the utility model discloses a technical scheme does: the ultra-wideband FPC antenna comprises a radiation piece, a flexible dielectric plate, a coplanar ground and a coplanar microstrip line, wherein the radiation piece, the coplanar ground and the coplanar microstrip line are all printed on the flexible dielectric plate and are all arranged on the same surface of the flexible dielectric plate; the radiation sheet is connected with the coplanar microstrip line, the coplanar ground surrounds the outer side of the coplanar microstrip line, and a coplanar gap is reserved between the radiation sheet and the coplanar microstrip line; and meanwhile, a gap is reserved between the radiation sheet and the coplanar ground.
As an optimal technical solution of the utility model, be equipped with a plurality of microstrip feeder on the radiation piece, just the microstrip feeder with coplane microstrip line is connected.
As an optimal technical solution of the utility model, the bottom of coplane microstrip line is connected with the coaxial line inner conductor, the coaxial line inner conductor is connected with the coaxial line outer conductor.
As the preferred technical scheme of the utility model, coplane ground is the U type, encloses the outside of coplane microstrip line, the width on coplane ground is with the radiation piece is the same. The size of the ultra-wideband FPC antenna is reduced by adopting a mode that a radiation sheet is as wide as a common ground.
As the preferred technical scheme of the utility model, the coplane microstrip line divide into the triplex, is microstrip line one, microstrip line two and microstrip line three respectively, and is corresponding, coplane ground divide into two parts, is coplane ground one and coplane ground two respectively, coplane ground one with coplane ground two enclose respectively microstrip line one, microstrip line two and the three outside of microstrip line, just coplane ground one with coplane ground two with microstrip line one microstrip line two with form coplane gap one, coplane gap two and coplane gap three between the microstrip line three respectively.
As a preferred technical solution of the present invention, the coplanar ground one and the coplanar ground two are connected to each other, and a connecting portion of the coplanar ground one and the coplanar ground two is connected to the coaxial line outer conductor; the microstrip line III is connected with the microstrip feeder line.
As an optimal technical scheme of the utility model, be equipped with three microstrip feeder on the radiation piece, be microstrip feeder one, microstrip feeder two and microstrip feeder three respectively, microstrip feeder one, microstrip feeder two and microstrip feeder three respectively with the radiation piece is connected.
As a preferred technical solution of the present invention, the coplanar ground one and the coplanar ground two perform characteristic impedance transformation from 50 Ω to 100 Ω; correspondingly, the first microstrip line, the second microstrip line and the third microstrip line perform 50-100 omega characteristic impedance conversion; the first coplanar gap and the second coplanar gap perform characteristic impedance transformation from 50 omega to 100 omega; the coaxial wire diameters of the coaxial wire inner conductor and the coaxial wire outer conductor are both 0.81mm; the connecting end of the coaxial line is an IPEX4 generation connector. The microstrip lines are trapezoidal, the coplanar ground is U-shaped and surrounds the microstrip lines, and the characteristic impedance transformation is performed by adopting a trapezoidal structure, so that the bandwidth of the antenna is increased. The impedance bandwidth of the antenna is widened by adopting an impedance gradual change method, and the impedance bandwidth is 3.54GHz-4.88GHz when the S11 of the antenna is less than or equal to-10 dB.
As the preferred technical proposal of the utility model, the flexible medium plate is a polyimide flexible plate with the total thickness of 0.1mm; the center frequency of the ultra-wideband FPC antenna is 4GHz, the width of the ultra-wideband FPC antenna is 5mm, namely the wavelength of 0.0667; the length is 30.5mm, i.e. 0.407 wavelength.
The utility model aims at providing an application of ultra wide band FPC antenna, the ultra wide band FPC antenna is pasted on the inner wall of the terminal equipment watch shell and is staggered and parallel with the screen of the terminal equipment watch; the radiation sheet, the coplanar ground and the coplanar microstrip line are all printed on the same surface of the flexible dielectric plate, so that the ultra-wideband FPC antenna is conveniently applied to a shell of terminal equipment; when the ultra-wideband FPC antenna S11 is less than or equal to minus 10dB, the impedance bandwidth is 3.54GHz-4.88GHz; the width of the radiation sheet is the same as that of the coplanar ground, and is set as L, and the formula is as follows:
wherein λ is e Is effective wavelength, f is center frequency, epsilon r The ultra-wideband FPC antenna is applied to the relative dielectric constant of the shell of the terminal equipment.
Compared with the prior art, the technical scheme has the beneficial effects that: the ultra-wideband FPC antenna is characterized in that an FPC flexible board (polyimide) is attached to the inner wall of a terminal device shell, the width of a radiating sheet of the antenna is the same as that of a coplanar ground, the width of the antenna is greatly reduced, the length, width and thickness of the antenna are 30.5mm 5mm 0.1mm, the impedance bandwidth of the antenna is widened by adopting an impedance gradual change method, the impedance bandwidth is 3.54GHz-4.88GHz when the antenna S11 is less than or equal to-10 dB, and the ultra-wideband FPC antenna is very suitable for being used in ultra-wideband positioning full-screen watch label terminal devices.
Description of the drawings:
the following detailed description is made with reference to the accompanying drawings and embodiments of the present invention:
fig. 1 is a structural diagram of a traditional ultra-wideband PCB antenna in the ultra-wideband FPC antenna of the present invention;
FIG. 2 is a structural diagram of the ultra-wideband FPC antenna in the ultra-wideband FPC antenna of the present invention;
FIG. 3 is a reverse side structure view of the inner wall of the watch case of the ultra wide band FPC antenna terminal equipment in the ultra wide band FPC antenna of the utility model;
FIG. 4 is a front structure view of the inner wall of the watch case of the ultra-wideband FPC antenna terminal device in the ultra-wideband FPC antenna of the utility model;
fig. 5 is an antenna S11 in the ultra-wideband FPC antenna of the present invention;
FIG. 6 is a H-plane directional diagram of the ultra-wideband FPC antenna of the present invention at 4 GHz;
FIG. 7 is the E face directional diagram of the ultra wide band FPC antenna of the present invention at 4 GHz;
wherein: the antenna comprises a 1-ultra wide band FPC antenna, 101-radiating sheets, 102-flexible dielectric boards, 103-coplanar ground, 1031-coplanar ground I, 1032-coplanar ground II, 104-coplanar microstrip lines, 1041-microstrip line I, 1042-microstrip line II, 1043-microstrip line III, 105-coplanar slot, 1051-coplanar slot I, 1052-coplanar slot II, 1053-coplanar slot III, 106-slot, 107-microstrip feeder lines, 1071-microstrip feeder line I, 1072-microstrip feeder line II, 1073-microstrip feeder line III, 108-coaxial line inner conductors, 109-coaxial line outer conductors, 2-watch shells, 3-screens and 4-batteries.
Detailed Description
In order to further explain the technical means and effects of the present invention, the following detailed description will be made on the specific implementation, structure, features and effects of the ultra-wideband FPC antenna with reference to the accompanying drawings and embodiments.
Referring to fig. 1, the conventional ultra-wideband PCB antenna has a large size and a rigid PCB dielectric board, and is completely unsuitable for use in a miniaturized terminal product.
Example (b): as shown in fig. 2-4, the ultra-wideband FPC antenna 1 includes a radiation patch 101, a flexible dielectric plate 102, a coplanar ground 103, and a coplanar microstrip line 104, where the radiation patch 101, the coplanar ground 103, and the coplanar microstrip line 104 are all printed on the flexible dielectric plate 102 and are all disposed on the same surface of the flexible dielectric plate 102; the other surface of the flexible dielectric plate 102 is processed by sticking double-sided adhesive tape for sticking the ultra-wideband FPC antenna on a terminal equipment product; the radiating patch 101 is connected with the coplanar microstrip line 104, the coplanar ground 103 surrounds the outer side of the coplanar microstrip line 104, and a coplanar gap 105 is reserved between the coplanar ground 103 and the coplanar microstrip line 104; meanwhile, a gap is reserved between the radiation sheet 101 and the coplanar ground 103; a plurality of microstrip feed lines 107 are arranged on the radiating patch 101, and the microstrip feed lines 107 are connected with the coplanar microstrip line 104; the bottom of the coplanar microstrip line 104 is connected with a coaxial line inner conductor 108, and the coaxial line inner conductor 108 is connected with a coaxial line outer conductor 109; the coplanar ground 103 is U-shaped and surrounds the outside of the coplanar microstrip line 104; the width of the common ground plane 103 is the same as that of the radiation sheet 101; the coplanar microstrip line 104 is divided into three parts, namely a first microstrip line 1041, a second microstrip line 1042 and a third microstrip line 1043, correspondingly, the coplanar ground 103 is divided into two parts, namely a first coplanar ground 1031 and a second coplanar ground 1032, the first coplanar ground 1031 and the second coplanar ground 1032 surround the outsides of the first microstrip line 1041, the second microstrip line 1042 and the third microstrip line 1043 respectively, and a first coplanar gap 1051, a second coplanar gap 1052 and a third coplanar gap 1053 are formed between the first coplanar ground 1031 and the second coplanar ground 1032 and the first microstrip line 1041, the second microstrip line 1042 and the third microstrip line 1043 respectively; the first coplanar ground 1031 and the second coplanar ground 1032 are connected with each other, and the first coplanar ground 1031 and the second coplanar ground 1032 are connected with the coaxial line outer conductor 109 at the interconnection; the coplanar microstrip line 104 is trapezoidal, the first microstrip line 1041 is connected with the coaxial line inner conductor 108, and the third microstrip line 1043 is connected with the microstrip feeder line 107; the radiating patch 101 is provided with three microstrip feed lines 107, namely a microstrip feed line I1071, a microstrip feed line II 1072 and a microstrip feed line III 1073, wherein the microstrip feed line I1071, the microstrip feed line II 1072 and the microstrip feed line III 1073 are respectively connected with the radiating patch 101; the first coplanar ground 1031 and the second coplanar ground 1032 perform 50 Ω -100 Ω characteristic impedance transformation; correspondingly, the first microstrip line 1041, the second microstrip line 1042 and the third microstrip line 1043 perform 50 Ω -to-100 Ω characteristic impedance conversion; the first coplanar gap 1051 and the second coplanar gap 1052 perform characteristic impedance transformation from 50 omega to 100 omega; the coaxial wire diameters of the coaxial wire inner conductor 108 and the coaxial wire outer conductor 109 are both 0.81mm; the connecting end of the coaxial line is an IPEX 4-generation connector; the flexible dielectric plate 102 is a polyimide flexible plate with the total thickness of 0.1mm; the center frequency of the ultra-wideband FPC antenna is 4GHz, and the width of the ultra-wideband FPC antenna is 5mm (0.0667 wavelength); the length is 30.5mm (0.407 wavelength).
As shown in fig. 3-4, the ultra-wideband FPC antenna 1 is attached to the inner wall of the watch case 2 of the terminal device product, and is staggered and parallel to the screen 3 of the terminal device watch; the terminal equipment watch also comprises a battery 4 which is arranged on one side of the ultra-wideband FPC antenna 1; the radiation sheet 101, the coplanar ground 103 and the coplanar microstrip line 104 are all printed on the same surface of the flexible dielectric slab 102, so that the ultra-wideband FPC antenna is conveniently applied to the terminal equipment watch shell 2; when the ultra-wideband FPC antenna S11 is less than or equal to minus 10dB, the impedance bandwidth is 3.54GHz-4.88GHz; the width of the radiation sheet 101 is the same as that of the coplanar ground 103, and is set as L, and the formula is as follows:
wherein λ is e Is effective wavelength, f is center frequency, epsilon r The ultra-wideband FPC antenna 1 is applied to the relative dielectric constant of a watch shell 2 of a terminal device.
Specific example 1: this kind of ultra wide band FPC antenna 1 requires: the center frequency is 4GHz, and the impedance bandwidth is 1GHz; the antenna was modeled using HFSS13.0 software, simulated and optimized, and the final dimensional parameters are shown in table 1.
TABLE 1 size parameters of key parts of the ultra-wideband FPC antenna
| Length/mm | Width/mm | Length/mm | Width/mm | ||
| Radiation slice (101) | 12.4 | 5 | Gap two (1052) | 8.02 | 0.24 |
| Coplanar ground (103) | 13.2 | 5 | Gap three (1053) | 2.15 | 0.25 |
| Coplanar slit one (1051) | 1.85 | 0.15 | Microstrip feeder (107) | 1.4 | 0.35 |
| Microstrip line one (1041) | 1.85 | 1.5 | Microstrip line three (1043) | 2.15 | 0.35 |
The ultra-wideband FPC antenna 1, S11 and the directional diagram refer to fig. 5-7, fig. 5 is a miniaturized narrow strip-shaped flexible ultra-wideband antenna S11, when S11 is less than-10 dB, the impedance bandwidth is 3.54GHz-4.88GHz as seen in fig. 5, fig. 6 is a main polarization and cross polarization directional diagram of Theta =90 ° H-plane at 4GHz of the ultra-wideband FPC antenna 1, when it is seen in fig. 6, the out-of-roundness of the main polarization component is less than 0.3dB, and the cross polarization component is less than-37.3 dB; fig. 7 shows the main polarization and cross-polarization patterns of the E-plane Phi =0 ° and Phi =90 ° at 4GHz of the ultra-wideband FPC antenna 1, the main polarization pattern being seen in fig. 7 as a lying "8" shape, the main polarization patterns substantially coinciding at Phi =0 ° and Phi =90 °, and the cross-polarization of the E-plane pattern being less than-27 dB at Phi =0 ° and Phi =90 °; table 2 shows that the maximum gains of the ultra-wideband FPC antenna 1 at different frequency points are all greater than 1dB, and the higher the frequency is, the larger the gain is, because the longer the effective electrical length of the antenna is when the frequency is higher.
TABLE 2 maximum gain of each frequency point of the ultra-wideband FPC antenna
| frequency/GHz | 3.5 | 4 | 4.5 |
| Maximum gain/dBi | 2.28 | 2.33 | 2.4 |
The above results indicate that the ultra-wideband FPC antenna 1 is omnidirectional radiation, the impedance bandwidth is greater than 1GHz, the maximum gains of different frequency points are all greater than 1dB, and the size of the ultra-wideband FPC antenna 1 is 30.5mm by 5mm by 0.1mm, so that both the performance and the size of the ultra-wideband FPC antenna 1 meet the use requirements.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are provided only to illustrate the principles of the present invention, and that some changes or modifications may be made without departing from the spirit and scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The ultra-wideband FPC antenna is characterized by comprising a radiation piece, a flexible dielectric plate, a coplanar ground and a coplanar microstrip line, wherein the radiation piece, the coplanar ground and the coplanar microstrip line are all printed on the flexible dielectric plate and are all arranged on the same surface of the flexible dielectric plate; the radiation sheet is connected with the coplanar microstrip line, the coplanar ground surrounds the outer side of the coplanar microstrip line, and a coplanar gap is reserved between the radiation sheet and the coplanar microstrip line; and a gap is reserved between the radiation sheet and the coplanar ground.
2. The ultra-wideband FPC antenna of claim 1, wherein a plurality of microstrip feed lines are disposed on the radiating patch, and the microstrip feed lines are connected to the coplanar microstrip lines.
3. The ultra-wideband FPC antenna of claim 2, wherein a coaxial inner conductor is connected to a bottom of the coplanar microstrip line, and a coaxial outer conductor is connected to the coaxial inner conductor.
4. The ultra-wideband FPC antenna of claim 3, wherein the coplanar ground is U-shaped and surrounds the outside of the coplanar microstrip line, and the width of the coplanar ground is the same as that of the radiating patch.
5. The ultra-wideband FPC antenna of claim 3, wherein the coplanar microstrip line is divided into three portions, namely a first microstrip line, a second microstrip line and a third microstrip line, and correspondingly, the coplanar ground is divided into two portions, namely a first coplanar ground and a second coplanar ground, the first coplanar ground and the second coplanar ground surround the outer sides of the first microstrip line, the second microstrip line and the third microstrip line, and a first coplanar slot, a second coplanar slot and a third coplanar slot are formed between the first coplanar ground and the second coplanar ground and the first microstrip line, the second microstrip line and the third microstrip line.
6. The ultra-wideband FPC antenna of claim 5, wherein the coplanar ground one and the coplanar ground two are connected to each other, and wherein the coplanar ground one and the coplanar ground two are connected to the coaxial line outer conductor where they are connected to each other; the microstrip line III is connected with the microstrip feeder line.
7. The ultra wide band FPC antenna of claim 4, wherein three microstrip feed lines are disposed on the radiating patch, respectively a first microstrip feed line, a second microstrip feed line and a third microstrip feed line, and the first microstrip feed line, the second microstrip feed line and the third microstrip feed line are respectively connected to the radiating patch.
8. The ultra-wideband FPC antenna of claim 5, wherein the first and second coplanar grounds perform 50 Ω -100 Ω characteristic impedance transformations; correspondingly, the first microstrip line, the second microstrip line and the third microstrip line perform 50-100 omega characteristic impedance conversion; the first coplanar slot and the second coplanar slot perform 50-100 omega characteristic impedance transformation.
9. The ultra-wideband FPC antenna of claim 8, wherein the flexible dielectric board is a polyimide flexible board with a total thickness of 0.1mm; the coaxial wire diameters of the coaxial wire inner conductor and the coaxial wire outer conductor are both 0.81mm; the connecting end of the coaxial line is an IPEX4 generation connector.
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| CN202211101776 | 2022-09-09 | ||
| CN2022111017763 | 2022-09-09 |
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| CN202222633109.1U Active CN218482398U (en) | 2022-09-09 | 2022-10-08 | Ultra-wideband FPC antenna |
| CN202211222415.4A Pending CN117728189A (en) | 2022-09-09 | 2022-10-08 | Ultra-wideband FPC antenna and application |
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