CN214176235U - Dual-beam broadband filtering antenna with absorptive radiation zero point - Google Patents
Dual-beam broadband filtering antenna with absorptive radiation zero point Download PDFInfo
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- CN214176235U CN214176235U CN202022925661.9U CN202022925661U CN214176235U CN 214176235 U CN214176235 U CN 214176235U CN 202022925661 U CN202022925661 U CN 202022925661U CN 214176235 U CN214176235 U CN 214176235U
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Abstract
The application discloses dual-beam broadband filtering antenna with absorptive radiation zero point, two pairs of short circuit metal patches and radiation patches through setting up, LC resonant circuit has been formed between the system floor, the radiation energy of work bandwidth upper edge frequency and lower limb frequency can be saved in the LC resonant circuit who sets up, make the radiation energy on the edge frequency of filtering antenna work bandwidth greatly suppressed the radiation and suppressed the feed port that reflects back filtering antenna, produce work bandwidth upper and lower limb absorptive radiation zero point, obtain good filtering frequency selection characteristic, the stability of the radio frequency equipment performance of connecting in the antenna rear end has been avoided destroying simultaneously. The two T-shaped metal strips are in short-circuit connection with the radiation patch, so that the current distribution on the radiation patch can be changed, the current distribution on the resonance frequency points in the two strips tends to be consistent, and the stable dual-beam radiation characteristic can be realized in a wider working frequency band.
Description
Technical Field
The application relates to the technical field of communication antennas, in particular to a dual-beam broadband filtering antenna with absorptive radiation zero points.
Background
In a wireless communication system, an antenna and a band-pass filter are two key devices, which determines the performance of the antenna and the band-pass filter and affects the communicable capability of the whole wireless communication system.
Nowadays, with the development of diversity and personality characteristics of wireless communication devices, especially in terms of convenience performance, the trend of antennas and filters toward smaller and integrated designs is promoted. Therefore, the antenna and the filter are integrated and designed into the filtering antenna, a matching circuit part in the traditional design is omitted, the size of the system is reduced, meanwhile, the filtering antenna also has the antenna radiation characteristic and the high out-of-band rejection capability of the passband filter, and the performance of the wireless communication system is improved on the whole. On the other hand, the dual-beam antenna has the advantages of large radiation coverage area and relatively concentrated energy, and is particularly suitable for improving the stability and the transmission rate of data and reducing energy loss in application occasions requiring large signal coverage area. However, the bandwidth of the existing dual-beam antenna is relatively narrow, and it is desired to further widen the bandwidth.
Currently, there are two methods for designing a filtering antenna. The first design method is a comprehensive design method, i.e. focusing on the design of a band-pass filter, and replacing the last stage resonance unit of the filter with an antenna radiation unit, but there is a large insertion loss and the size of the filter antenna is also large. The second method is a fusion design method, i.e. focusing on antenna design, without additional filter circuit, which can avoid insertion loss, and is beneficial to realizing small size of antenna, thereby overcoming the defects brought by the comprehensive design method. Meanwhile, most antennas based on the fusion design method reflect most energy waves back to a signal input port by enabling the antenna to be subjected to sharp mismatch of out-of-band impedance matching, so that out-of-band radiation is effectively inhibited, a radiation zero point of the emission is realized, and the filtering performance of the filtering antenna is realized. However, the filtering antenna based on the fusion design method cannot achieve the absorptive filtering performance without reflection or with small reflection energy without introducing an additional filter or an out-of-band energy dissipation resistor, so that the out-of-band reflected wave may reduce the stability of the radio frequency device (such as a receiver/transmitter) connected to the rear end of the antenna, resulting in the system performance being damaged.
Chinese utility model patent No. 201810534584.9 discloses a dual-band patch antenna with omnidirectional radiation, its microstrip patch antenna who discloses has omnidirectional radiation, the characteristic of dual-frenquency, and the frequency band broad, its low section and simple structure, but, this microstrip patch antenna is the reflectivity filtering, can influence the stability of connecting in the radio frequency equipment performance of antenna rear end, damages the system performance.
Chinese utility model patent No. ZL201720613757.7 discloses a novel directional radiation MIMO patch antenna of dual beam and terminal thereof, and it discloses a section utilizes strap and paster gap to realize the better dual beam patch antenna of wide band operating bandwidth and filtering capability to this dual beam patch antenna has constituted four units's MIMO patch antenna simultaneously. However, the dual-beam patch antenna is reflective filtering, which also affects the stability of the performance of the radio frequency device connected to the rear end of the antenna and deteriorates the system performance.
SUMMERY OF THE UTILITY MODEL
The application provides a dual-beam broadband filtering antenna with absorptive radiation zero for solve the technical problems that the performance of radio frequency equipment connected to the rear end of the antenna is influenced by the existing filtering antenna, the energy loss is high and the working bandwidth is narrow.
In view of the above, the present application provides a dual-beam broadband filtering antenna with an absorptive radiation null, comprising: the system comprises a first substrate, a second substrate, a system floor, a radiation patch, a first short-circuit metal patch, a second short-circuit metal patch, a third short-circuit metal patch, a fourth short-circuit metal patch, a first T-shaped metal strip and a second T-shaped metal strip;
the system floor is printed on the bottom surface of the first substrate, and the second substrate is arranged on the top surface of the first substrate;
the radiation patch is printed on the top surface of the second substrate and provided with a feed probe;
the first short circuit metal patch and the second short circuit metal patch are symmetrically printed on the top surface of the second substrate along the first central axis of the second substrate, the third short circuit metal patch and the fourth short circuit metal patch are symmetrically printed on the top surface of the second substrate along the first central axis of the second substrate, and the first short circuit metal patch, the second short circuit metal patch, the third short circuit metal patch and the fourth short circuit metal patch are all coupled with the radiation patch, the sizes of the third short circuit metal patch and the fourth short circuit metal patch are smaller than the sizes of the first short circuit metal patch and the second short circuit metal patch, the first short circuit metal patch, the second short circuit metal patch, the third short circuit metal patch and the fourth short circuit metal patch are all in short circuit connection with the system floor through a first metal pin;
the first T-shaped metal strip and the second T-shaped metal strip are symmetrically printed on the top surface of the second substrate along a second central axis of the second substrate, and the first T-shaped metal strip and the second T-shaped metal strip are in short-circuit connection with the radiation patch through a second metal pin.
Preferably, the radiation patch is partially printed on a central region of the bottom surface of the second substrate.
Preferably, the radiation patch includes a first radiation patch, a second radiation patch and a third radiation patch, the first radiation patch and the second radiation patch are arranged at intervals to form an interval region, the first radiation patch and the second radiation patch are connected through the third radiation patch to form an i-shaped structure, and the first short circuit metal patch, the second short circuit metal patch, the third short circuit metal patch and the fourth short circuit metal patch are all arranged in the interval region.
Preferably, the first short circuit metal patch and the second short circuit metal patch are disposed close to the first central axis of the second substrate relative to the third short circuit metal patch and the fourth short circuit metal patch.
Preferably, the feeding probe is provided at the center of the radiation patch.
Preferably, the first T-shaped metal strip and the second T-shaped metal strip are both disposed below the radiation patch.
Preferably, the first metal pins are four in particular.
Preferably, the second metal pins are two in particular.
Preferably, the first central axis and the second central axis are disposed orthogonal to each other.
Preferably, the shapes of the radiating patch, the first short-circuit metal patch, the second short-circuit metal patch, the third short-circuit metal patch and the fourth short-circuit metal patch are circular, rectangular, prismatic or irregular.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides a dual-beam broadband filtering antenna with absorptive radiation zero point, two pairs of short circuit metal patches and radiation patches through setting up, the LC resonant circuit has been formed between the system floor, the radiant energy of operating bandwidth top edge frequency and lower limb frequency can be saved in the LC resonant circuit who sets up, make radiant energy on the marginal frequency of filtering antenna operating bandwidth greatly suppressed the radiation and restrain the feed port that reflects back filtering antenna, produce operating bandwidth top, the absorptive radiation zero point of lower limb, make filtering antenna have good band edge roll rate, obtain good filtering frequency selection characteristic, the stability of the radio frequency equipment performance of connecting in the antenna rear end has been avoided destroying simultaneously. The two T-shaped metal strips are in short-circuit connection with the radiation patch, so that current distribution on the radiation patch can be changed, and current distribution on resonant frequency points in the two strips tends to be consistent, so that stable dual-beam radiation characteristics can be realized in a wider working frequency band.
Drawings
Fig. 1 is a schematic perspective view of a dual-beam broadband filtering antenna with an absorptive radiation null according to an embodiment of the present application;
fig. 2 is a schematic side view of a dual-beam broadband filtering antenna with an absorptive radiation null according to an embodiment of the present application;
fig. 3 is a schematic top view of a dual-beam broadband filtering antenna with an absorptive radiation null according to an embodiment of the present application;
FIG. 4 shows a reflection coefficient S of a dual-beam broadband filter antenna with an absorptive radiation null according to an embodiment of the present application11And an electromagnetic simulation plot of the frequency response of the gain with time;
FIG. 5 is an electromagnetic simulation graph of the response of radiation efficiency with frequency for a dual beam broadband filtering antenna with absorptive radiation nulls as provided by an embodiment of the present application;
fig. 6 is a two-dimensional radiation pattern of a dual-beam broadband filtering antenna with absorptive radiation nulls at two radiation resonance frequencies thereof according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For easy understanding, please refer to fig. 1 to 3, the present application provides a dual-beam broadband filtering antenna with an absorptive radiation null, including: the antenna comprises a first substrate 10, a second substrate 20, a system floor 11, a radiation patch 21, a first short-circuit metal patch 31, a second short-circuit metal patch 32, a third short-circuit metal patch 41, a fourth short-circuit metal patch 42, a first T-shaped metal strip 51 and a second T-shaped metal strip 52;
the system floor 11 is printed on the bottom surface of the first substrate 10, and the second substrate 20 is disposed on the top surface of the first substrate 10;
it is understood that the bottom surface and the top surface of the first substrate 10 are oppositely disposed to each other.
The radiation patch 21 is printed on the top surface of the second substrate 20, and the radiation patch 21 is provided with a feed probe 22;
the first short circuit metal patch 31 and the second short circuit metal patch 32 are symmetrically printed on the top surface of the second substrate 20 with respect to the first central axis of the second substrate 20, the third short circuit metal patch 41 and the fourth short circuit metal patch 42 are symmetrically printed on the top surface of the second substrate 20 with respect to the first central axis of the second substrate 20, the first short circuit metal patch 31, the second short circuit metal patch 32, the third short circuit metal patch 41 and the fourth short circuit metal patch 42 are coupled with the radiation patch 21, the sizes of the third short circuit metal patch 41 and the fourth short circuit metal patch 42 are smaller than those of the first short circuit metal patch 31 and the second short circuit metal patch 32, and the first short circuit metal patch 31, the second short circuit metal patch 32, the third short circuit metal patch 41 and the fourth short circuit metal patch 42 are in short circuit connection with the system floor 11 through first metal pins 61, 62, 63 and 64;
it should be noted that the number of the first metal pins 61, 62, 63, and 64 is specifically four, that is, the first short-circuit metal patch 31, the second short-circuit metal patch 32, the third short-circuit metal patch 41, and the fourth short-circuit metal patch 42 are connected to the system floor 11 in a short-circuit manner through the corresponding first metal pins.
Meanwhile, the first short circuit metal patch 31, the second short circuit metal patch 32, the third short circuit metal patch 41 and the fourth short circuit metal patch 42 are all arranged without being overlapped with the radiation patch 21.
The first T-shaped metal strip 51 and the second T-shaped metal strip 52 are symmetrically printed on the bottom surface of the second substrate 20 about the second central axis of the second substrate 20, and both the first T-shaped metal strip 51 and the second T-shaped metal strip 52 are short-circuited to the radiation patch 21 through the second metal pins 71 and 72.
It should be noted that the two second metal pins 71 and 72 are specifically two, that is, the first T-shaped metal strip 51 and the second T-shaped metal strip 52 are respectively connected to the radiation patch 21 by short circuit through the corresponding second metal pins.
In addition, in one example, the first central axis and the second central axis are disposed orthogonal to each other.
Further, the radiation patch 21 is partially printed on a central region of the top surface of the second substrate 20.
Further, the radiation patch 21 includes a first radiation patch 211, a second radiation patch 212, and a third radiation patch 213, the first radiation patch 211 and the second radiation patch 212 are disposed at an interval to form an interval region, the first radiation patch 211 and the second radiation patch 212 are connected by the third radiation patch 213 to form an i-shaped structure, and the first short circuit metal patch 31, the second short circuit metal patch 32, the third short circuit metal patch 41, and the fourth short circuit metal patch 42 are disposed in the interval region.
Note that the first radiation patch 211 and the second radiation patch 212 are integrally formed after being connected by the third radiation patch 213.
Further, the first and second short metal patches 31 and 32 are disposed close to the first central axis of the second substrate 20 with respect to both the third and fourth short metal patches 41 and 42.
Further, the feeding probe 22 is provided at the center of the radiation patch 21.
Further, the first T-shaped metal strip 51 and the second T-shaped metal strip 52 are both provided below the radiation patch 21.
Further, the shapes of the radiation patch 21, the first short-circuit metal patch 31, the second short-circuit metal patch 32, the third short-circuit metal patch 41, and the fourth short-circuit metal patch 42 are specifically circular, rectangular, prismatic, or irregular.
It should be noted that the working principle of this embodiment is as follows:
after the feed probe 22 receives a circuit feed signal, the signal can be directly transmitted to the radiation patch 21 to generate radiation energy, when the upper and lower working frequency bands are at the edge, because the radiation patch 21 is respectively coupled with the first short circuit metal patch 31, the second short circuit metal patch 32, the third short circuit metal patch 41 and the fourth short circuit metal patch 42, the energy can be respectively coupled to the short circuit metal patches from the radiation patch 21, because the first short circuit metal patch 31, the second short circuit metal patch 32, the third short circuit metal patch 41 and the fourth short circuit metal patch 42 are all in short circuit connection with the system floor 11 through the first metal pin, an LC resonance circuit is formed, the energy can be respectively stored in parasitic inductance and capacitance generated by the four short circuit metal patches, so that the energy can not be effectively radiated, and the reflected energy of an incident port is also suppressed, since the sizes of the first short circuit metal patch 31 and the second short circuit metal patch 32 are relatively large, an absorptive radiation zero point at the edge of the lower operating frequency band can be generated; the third short circuit metal patch 41 and the fourth short circuit metal patch 42 have relatively small sizes, so that an absorptive radiation zero point at the edge of an upper working frequency band can be generated, the filter antenna obtains a good band edge roll-off rate, and the filtering capability of the filter antenna and the performance stability of radio frequency equipment connected to the rear end of the antenna are improved.
Meanwhile, in the working frequency band, a pair of T-shaped metal strips is introduced below the radiation patch 21 and is in short-circuit connection with the radiation patch 21, so that the current distribution on the radiation patch 21 can be changed, the current distribution on the resonance frequency points in the two bands tends to be consistent, and the stable dual-beam radiation characteristic can be realized in the broadband working frequency band.
Due to the fact that the pair of T-shaped metal belts is introduced below the radiation patch 21 and the capacitor formed between the T-shaped metal belts and the radiation patch enables out-of-band impedance matching of the filter antenna to be rapidly worsened, out-of-band energy is reflected back to the feed port, four out-of-band reflection type radiation zeros are generated, out-of-band interference radiation is effectively suppressed, the filter antenna has good out-of-band radiation suppression, and good filtering characteristics are obtained.
For ease of understanding, please refer to the electromagnetic simulation graphs of fig. 4-6.
Wherein, fig. 4 is the reflection coefficient S of the filter antenna in this embodiment11An electromagnetic simulation curve of the response with frequency and an electromagnetic simulation curve of the response of the antenna with frequency in both directions of (Phi 90 DEG, Theta 40 DEG) and (Phi 90 DEG, Theta 40 DEG). As shown in fig. 4, in the operating frequency band, the gains of the filter antenna in both directions (Phi ═ 0 °, Theta ═ 40 °) and (Phi ═ 0 °, Theta ═ 40 °) are substantially maintained at 7dBi, and the filter antenna gain is very stable, which proves that stable dual-beam radiation characteristics are achieved in the filter antenna band.
Meanwhile, the gain of the filtering antenna sharply decreases at the edges of the upper working frequency band and the lower working frequency band to form two radiation zero points, which proves that most of radiation energy is not radiated, and a good band edge roll-off rate is obtained, so that the frequency selectivity of the filtering antenna is improved, and the filtering capability is good.
Further, as shown in fig. 4, the reflection coefficient S corresponding to the frequencies of the two radiation zeros formed at the upper and lower operating band edges11Remaining less than-10 dB, demonstrates that a significant portion of the antenna energy is not reflected back to the input port. Therefore, it can be shown that the absorptive radiation zero is generated in the filter antenna, and the performance of the radio frequency device (such as a receiver/transmitter) of the back end of the antenna can be prevented from being damaged by the reflected wave. Meanwhile, a pair of T-shaped metal strips is introduced between the radiation patch 21 and the system floor 11, and the out-of-band reflection coefficient S is kept11On the premise of approaching 0dB, the two reflection-type radiation zero points formed by the upper stop band and the lower stop band can effectively inhibit out-of-band radiation, so that good filtering performance is obtained.
Fig. 5 is an electromagnetic simulation curve of the response of the radiation efficiency of the filter antenna with frequency in the present embodiment. As shown in fig. 5, the radiation efficiency of the filtering antenna drops sharply near the upper and lower cutoff frequencies of the operating band of the filtering antenna, which proves that the filtering antenna in this embodiment not only obtains filtering performance in both directions (Phi is 0 °, Theta is 40 °) and (Phi is 0 °, Theta is-40 °), but also obtains good out-of-band radiation suppression in the 360 ° omnidirectional range, and has good filtering performance.
Fig. 6 is a two-dimensional radiation pattern of the filter antenna in the present embodiment at two radiation resonance point frequencies thereof. As shown in fig. 6, the filter antenna has good dual-beam radiation performance at two in-band resonance frequency points, and the cross polarization of the filter antenna is less than 35dBi, and the cross polarization ratio is good. It can be shown that the pair of T-shaped metal strips introduced between the radiation patch 21 and the system floor 11 can effectively change the current distribution, so that the current distribution at the two in-band resonant frequency points tends to be consistent, similar to the pure TM02 mode current distribution, thereby facilitating the implementation of stable dual-beam radiation characteristics in a wide frequency operating band.
The utility model discloses compare with traditional filtering antenna and proposed a dual-beam broadband filtering antenna with absorptive radiation zero point, two pairs of short circuit metal paster and radiation paster through setting up, LC resonant circuit has been formed between the system floor, the radiant energy of working bandwidth top edge frequency and lower limb frequency can be saved in the LC resonant circuit who sets up, make radiant energy on the marginal frequency of filtering antenna working bandwidth greatly suppressed the radiation and suppressed the feed port that reflects back filtering antenna, produce working bandwidth on, the absorptive radiation zero point of lower limb, make filtering antenna have good band edge rate of rolling, obtain good filtering frequency selection characteristic, the stability of the radio frequency equipment performance of connecting in the antenna rear end has been avoided destroying simultaneously. The two T-shaped metal strips are in short-circuit connection with the radiation patch, so that current distribution on the radiation patch can be changed, and current distribution on resonant frequency points in the two strips tends to be consistent, so that stable dual-beam radiation characteristics can be realized in a wider working frequency band.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A dual-beam broadband filter antenna having an absorptive radiation null, comprising: the system comprises a first substrate, a second substrate, a system floor, a radiation patch, a first short-circuit metal patch, a second short-circuit metal patch, a third short-circuit metal patch, a fourth short-circuit metal patch, a first T-shaped metal strip and a second T-shaped metal strip;
the system floor is printed on the bottom surface of the first substrate, and the second substrate is arranged on the top surface of the first substrate;
the radiation patch is printed on the top surface of the second substrate and provided with a feed probe;
the first short circuit metal patch and the second short circuit metal patch are symmetrically printed on the top surface of the second substrate along the first central axis of the second substrate, the third short circuit metal patch and the fourth short circuit metal patch are symmetrically printed on the top surface of the second substrate along the first central axis of the second substrate, and the first short circuit metal patch, the second short circuit metal patch, the third short circuit metal patch and the fourth short circuit metal patch are all coupled with the radiation patch, the sizes of the third short circuit metal patch and the fourth short circuit metal patch are smaller than the sizes of the first short circuit metal patch and the second short circuit metal patch, the first short circuit metal patch, the second short circuit metal patch, the third short circuit metal patch and the fourth short circuit metal patch are all in short circuit connection with the system floor through a first metal pin;
the first T-shaped metal strip and the second T-shaped metal strip are symmetrically printed on the bottom surface of the second substrate along a second central axis of the second substrate, and the first T-shaped metal strip and the second T-shaped metal strip are in short-circuit connection with the radiation patch through a second metal pin.
2. The dual-beam broadband filter antenna with an absorptive radiation null of claim 1, wherein the radiating patch is partially printed in a central region of the top surface of the second substrate.
3. The dual-beam broadband filtering antenna with an absorptive radiation null of claim 1, wherein the radiating patches comprise a first radiating patch, a second radiating patch and a third radiating patch, the first radiating patch and the second radiating patch being spaced apart to form a spacing region, the first radiating patch and the second radiating patch being connected by the third radiating patch to form an "I" structure, the first short-circuit metal patch, the second short-circuit metal patch, the third short-circuit metal patch and the fourth short-circuit metal patch being disposed within the spacing region.
4. The dual beam broadband filter antenna with absorptive radiation null of claim 1 or 3, wherein the first and second shorting metal patches are disposed proximate the first central axis of the second substrate relative to both the third and fourth shorting metal patches.
5. The dual-beam broadband filter antenna with an absorptive radiation null of claim 1, wherein the feed probe is located at the center of the radiating patch.
6. The dual beam broadband filter antenna with an absorptive radiation null of claim 1, wherein the first and second T-shaped metal strips are both disposed below the radiating patch.
7. The dual-beam broadband filter antenna with an absorptive radiation null of claim 1, wherein the first metal pin is specifically four.
8. The dual-beam broadband filter antenna with an absorptive radiation null of claim 1, wherein the second metal pins are specifically two.
9. The dual beam broadband filter antenna with an absorptive radiation null of claim 1, wherein the first central axis and the second central axis are disposed orthogonal to each other.
10. The dual-beam broadband filtering antenna with an absorptive radiation null of claim 1, wherein the radiating patch, the first short-circuit metal patch, the second short-circuit metal patch, the third short-circuit metal patch and the fourth short-circuit metal patch are shaped in particular as circles, rectangles or prisms.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112490657A (en) * | 2020-12-09 | 2021-03-12 | 广东工业大学 | Dual-beam broadband filtering antenna with absorptive radiation zero point |
| CN112490657B (en) * | 2020-12-09 | 2024-05-14 | 广东工业大学 | Dual-beam broadband filter antenna with absorptive radiation zero point |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112490657A (en) * | 2020-12-09 | 2021-03-12 | 广东工业大学 | Dual-beam broadband filtering antenna with absorptive radiation zero point |
| CN112490657B (en) * | 2020-12-09 | 2024-05-14 | 广东工业大学 | Dual-beam broadband filter antenna with absorptive radiation zero point |
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