CN110854487B - Dual-passband bandwidth-adjustable reconfigurable filter - Google Patents
Dual-passband bandwidth-adjustable reconfigurable filter Download PDFInfo
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Abstract
The invention provides a reconfigurable filter with adjustable dual-passband bandwidth, which comprises a micro-strip structure layer, a dielectric plate and a metal floor, a first diode, a second diode and a direct-current power supply, wherein the micro-strip structure layer, the dielectric plate and the metal floor are sequentially stacked; the microstrip structure layer comprises a multimode resonator, a coupling line group and a feed port group, and the feed port group is coupled with the multimode resonator through the coupling line group; the multimode resonator comprises a first microstrip line, a second microstrip line, a third microstrip line and a fourth microstrip line; the first microstrip line is connected with the metal floor; one end of the first microstrip line is connected with the coupling line group, and the other end of the first microstrip line is respectively connected with the first diode, the second diode and the fourth microstrip line; the first diode is connected with the direct current power supply through the second microstrip line, and the second diode is connected with the direct current power supply through the third microstrip line. The two passband bandwidths of the filter are adjustable with the same amplitude, and in-band interference is effectively prevented.
Description
Technical Field
The invention relates to the technical field of microwave communication, in particular to a reconfigurable filter with adjustable dual-passband bandwidth.
Background
In recent years, with the rapid development of wireless communication technology in China, new communication systems and communication forms are continuously appeared, and new requirements and challenges are brought to the design of band-pass filters. Taking 5G communication as an example, in order to improve the transmission rate of data, the working bandwidth of the filter is continuously increased, and the working frequency is continuously improved; to meet different requirements, the filter needs to have a plurality of working frequency bands; in order to realize miniaturization and design simplification of a system, filters with different reconfigurable characteristics are urgently needed. Under the background, a high-performance multi-passband bandpass filter with new reconfigurable characteristics is successfully designed, and the development of modern wireless communication can be greatly promoted. In addition, Space communication is gradually rising, and american Space X company is planning to launch more than 4000 small satellites to the near earth orbit and to network them, so as to provide high-speed wireless internet service for the world. However, the limited bearing capacity of the small satellite requires that the dual-passband bandwidth is reconfigurable on the premise of ensuring high-quality communication, and the section, the volume, the weight and the cost of a filter are as small as possible.
The bandwidth reconfiguration of the existing dual-passband filter is realized based on two design modes: (1) connecting two passive filters in parallel; (2) a multi-mode concept. The design based on the first mode has the following defects: the bandwidth is narrow, the adjustable range of the bandwidth is small, and the center frequency ratio is limited. The design based on the second mode is all non-electrically adjustable, and wide commercial application in an intelligent technology environment is difficult to carry out. Besides, the existing bandwidth reconfigurable dual-passband band-pass filter is realized by changing the electrical length of a certain structure of the filter. Thus, only individual adjustability of a single passband edge can be achieved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the filter has the advantages of low design section, small volume, light weight and low processing cost, can electrically adjust the positions of the first passband edge and the fourth passband edge, and reconstructs the dual passband bandwidth with the same amplitude.
In order to solve the technical problems, the invention adopts the technical scheme that:
a dual-passband bandwidth-adjustable reconfigurable filter comprises a microstrip structure layer, a dielectric plate and a metal floor which are sequentially stacked, and further comprises a first diode, a second diode and a direct-current power supply; the microstrip structure layer comprises a multimode resonator, a coupling line group and a feed port group, and the feed port group is coupled with the multimode resonator through the coupling line group; the multimode resonator comprises a first microstrip line, a second microstrip line, a third microstrip line and a fourth microstrip line; the first microstrip line is connected with the metal floor; one end of the first microstrip line is connected with the coupling line group, and the other end of the first microstrip line is respectively connected with the first diode, the second diode and the fourth microstrip line; the first diode is connected with the direct current power supply through the second microstrip line, and the second diode is connected with the direct current power supply through the third microstrip line.
Furthermore, a fifth microstrip line for eliminating the pole of the multimode resonator is further connected to a connection end of the first microstrip line and the coupling line group.
Further, the feeding port group comprises a first port and a second port, and the coupling line group comprises a first line and a second line; the first port is provided with an electrical length θ coupled to the first wire1The second port is provided with a second microstrip line having an electrical length θ coupled to the first microstrip line2The seventh microstrip line of (1), wherein θ is 75 ° < θ ≦1<105°，75°<θ2≤105°，θ1<θ2。
Furthermore, one end of the sixth microstrip line is coupled in parallel with the first line, and the other end of the sixth microstrip line is coupled in parallel with the first microstrip line after being bent; one end of the seventh microstrip line is coupled with the second line in parallel, and the other end of the seventh microstrip line is coupled with the first microstrip line in parallel after being bent.
Furthermore, the first port is further provided with an eighth microstrip line coupled in parallel with the first line, and the eighth microstrip line and the sixth microstrip line are separated at two sides of the first line; the second port is further provided with a ninth microstrip line coupled in parallel with the second line, and the ninth microstrip line and the seventh microstrip line are arranged on two sides of the second line.
Further, the first line, the second line, the first microstrip line, the second microstrip line, the third microstrip line, the fourth microstrip line, the fifth microstrip line, the eighth microstrip line and the ninth microstrip line have equal electrical lengths; the characteristic impedance of the second microstrip line is equal to that of the third microstrip line.
Further, the inductor also comprises a first inductor and a second inductor; the second microstrip line is connected with the direct-current power supply through the first inductor; the third microstrip line is connected with the direct current power supply through the second inductor.
Furthermore, the metal floor further comprises a resistor, and the first microstrip line is connected with the metal floor through the resistor.
Further, the characteristic impedance of the first port and the characteristic impedance of the second port are both 50 Ω.
Further, the dielectric plate has a thickness of 0.813mm and a dielectric constant of 3.38.
The invention has the beneficial effects that: when the direct current power supply does not supply power to the first diode and the second diode, only the first microstrip line and the fourth microstrip line work in the multimode resonator; when the direct current power supply supplies power to the first diode/the second diode, the second microstrip line/the third microstrip line is electrified, and the first microstrip line, the second microstrip line/the third microstrip line and the fourth microstrip line in the multimode resonator work; when the direct current power supply supplies power to the first diode and the second diode simultaneously, the second microstrip line and the third microstrip line are electrified, and the first microstrip line, the second microstrip line, the third microstrip line and the fourth microstrip line in the multimode resonator work. The number of the microstrip lines participating in the work in the multimode resonator is indirectly controlled by controlling whether power is supplied to the first diode and/or the second diode, so that various working structure modes of the multimode resonator are obtained, and the change of the passband bandwidth of the filter is realized. The filter can be directly processed and molded on a core board, and a finished product has the characteristics of low section, small volume, light weight and the like, is low in processing cost, can be applied to a modern multifunctional wireless communication system, and has two passband bandwidths which are adjustable in the same amplitude; the wireless communication system can be ensured to have fixed center frequency under different working states, and in-band interference is effectively prevented.
Drawings
The detailed structure of the invention is described in detail below with reference to the accompanying drawings
FIG. 1 is a side view of a dual-passband bandwidth adjustable reconfigurable filter of the present invention;
FIG. 2 is a top view of a dual-passband bandwidth-adjustable reconfigurable filter according to the present invention;
FIG. 3 is an equivalent circuit diagram of a dual-passband bandwidth-adjustable reconfigurable filter according to the present invention;
FIG. 4 is a diagram of a theoretical analysis result of a dual-passband bandwidth-adjustable reconfigurable filter according to the present invention;
FIG. 5 is a diagram of simulation and test results of Case A of a dual-passband bandwidth-adjustable reconfigurable filter according to the present invention;
FIG. 6 is a diagram of simulation and test results of Case B of a dual-passband bandwidth-adjustable reconfigurable filter according to the present invention;
FIG. 7 is a diagram of simulation and test results of Case C of a dual-passband bandwidth-adjustable reconfigurable filter according to the present invention;
fig. 8 is a test result diagram of three different working states of Case a, Case B and Case C of the dual-passband bandwidth-adjustable reconfigurable filter of the invention.
The antenna comprises a first microstrip line 1, a second microstrip line 2, a third microstrip line 3, a fourth microstrip line 4, a fifth microstrip line 5, a sixth microstrip line 6, a seventh microstrip line 7, an eighth microstrip line 8, a ninth microstrip line 9, a first line 10, a second line 11, a first diode 12, a second diode 13, a direct current power supply 14, a first inductor 15, a second inductor 16, a resistor 17, a via hole 18, a microstrip structure layer 19, a dielectric slab 20, a metal floor 21, a first port 22 and a second port 23.
Detailed Description
The most key concept of the invention is as follows: the working structural mode of the multimode resonator is indirectly changed by the on-off of the switch diode, and the change of the dual-passband bandwidth of the filter is further realized.
To further explain the feasibility of the inventive concept, the technical content, the structural features, the objects and the effects thereof according to the present invention are described in detail below with reference to the accompanying drawings.
Examples
Referring to fig. 1, fig. 2 and fig. 3, a dual-passband bandwidth-adjustable reconfigurable filter includes a microstrip structure layer 19, a dielectric plate 20 and a metal floor 21, which are stacked in sequence, and further includes a first diode 12, a second diode 13 and a dc power supply 14; the microstrip structure layer 19 includes a multimode resonator, a coupling line group and a feeding port group, and the feeding port group is coupled with the multimode resonator through the coupling line group; the multimode resonator comprises a first microstrip line 1, a second microstrip line 2, a third microstrip line 3 and a fourth microstrip line 4; the first microstrip line 1 is connected with the metal floor 21; one end of the first microstrip line 1 is connected with the coupling line group, and the other end of the first microstrip line is respectively connected with the first diode 12, the second diode 13 and the fourth microstrip line 4; the first diode 12 is connected with the dc power supply 14 through the second microstrip line 2, and the second diode 13 is connected with the dc power supply 14 through the third microstrip line 3.
The first diode 12 and the second diode 13 are both switching diodes, and particularly, PIN diodes may be used.
From the above description, the beneficial effects of the present invention are: referring to table 1, table 1 shows three operating states of two switching diodes: when the direct current power supply 14 does not supply power to the first diode 12 and the second diode 13, only the first microstrip line 1 and the fourth microstrip line 4 in the multimode resonator work (Case a); when the direct current power supply 14 supplies power to the first diode 12/the second diode 13, the second microstrip line 2/the third microstrip line 3 is electrified, and the first microstrip line 1, the second microstrip line 2/the third microstrip line 3 and the fourth microstrip line 4 in the multimode resonator work (Case B); when the direct current power supply 14 supplies power to the first diode 12 and the second diode 13 simultaneously, the second microstrip line 2 and the third microstrip line 3 are both electrified, and the first microstrip line 1, the second microstrip line 2, the third microstrip line 3 and the fourth microstrip line 4 in the multimode resonator all work (Case C). The number of the microstrip lines participating in the work in the multimode resonator is indirectly controlled by controlling whether power is supplied to the first diode 12 and/or the second diode 13, so that various working structural modes of the multimode resonator are obtained, and the change of the passband bandwidth of the filter is realized. The filter can be directly processed and molded on a core plate, and a finished product has the characteristics of low section, small volume, light weight and the like, is low in processing cost, and can be applied to a modern multifunctional wireless communication system; the wireless communication system can be ensured to have fixed center frequency under different working states, and in-band interference is effectively prevented.
The filter comprises a multi-mode resonator filter formed by a first microstrip line 1, a second microstrip line 2, a third microstrip line 3 and a fourth microstrip line 4, and a dual-passband is generated during working and sequentially comprises a first passband edge, a second passband edge, a third passband edge and a fourth passband edge from low frequency to high frequency. The multimode resonator is provided with two controllable zero points which can improve the selectivity of the first passband edge and the fourth passband edge, namely the selectivity of the first passband edge and the fourth passband edge is not reduced along with the change of the working state.
TABLE 1
| Case A | Case B | Case C | |
| First diode | Is not electrified | Without electricity (power on) | Is electrified |
| Second diode | Is not electrified | Electrifying (non-electrifying) | Is electrified |
The theoretical analysis result of the performance of the reconfigurable filter with adjustable dual-passband bandwidth in three working states of the switching diode given in table 1 is shown in fig. 4. As can be seen from fig. 4, in three operating states of the reconfigurable filter with adjustable dual passband bandwidth, the second passband edge and the third passband edge are unchanged in position; as the operating state goes from Case a to Case C, the bandwidth of the filter widens from narrow and the first and fourth passband edges are adjusted by the same magnitude.
Further, the connecting end of the first microstrip line 1 and the coupling line group is further connected with a fifth microstrip line 5 for eliminating the pole of the multimode resonator. A pole is also created in the multimode resonator, located in the middle of the two passbands, and needs to be eliminated.
Further, the feeding port group includes a first port 22 and a second port 23, and the coupling line group includes a first line 10 and a second line 11; the first port 22 is provided with an electrical length θ coupled to the first wire 101The second port 23 is provided with an electrical length θ coupled to the second line 112The seventh microstrip line 7, wherein θ is not less than 75 °(s)1<105°，75°<θ2≤105°，θ1<θ2. The positions of the second passband edge and the third passband edge are determined by introducing the sixth microstrip line 6 and the seventh microstrip line 7 and further introducing two transmission zeros. In an actual product, after the electrical lengths of the sixth microstrip line 6 and the seventh microstrip line 7 are determined and manufactured, no matter whether the second microstrip line 2 or/and the third microstrip line 3 in the multimode resonator work together with the first microstrip line 1 and the fourth microstrip line 4, the positions of the second microstrip line side and the third microstrip line side cannot change, and the working central frequency band cannot change. The first port 22 and the second port 23 may both input or output microwave signals.
Further, one end of the sixth microstrip line 6 is coupled in parallel with the first line 10, and the other end of the sixth microstrip line is coupled in parallel with the first microstrip line 1 after being bent; one end of the seventh microstrip line 7 is coupled with the second line 11 in parallel, and the other end is coupled with the first microstrip line 1 in parallel after being bent. In an actual product, the electrical length of the sixth microstrip line 6 is longer than the electrical length of the first line 10, and the electrical length of the seventh microstrip line 7 is longer than the electrical length of the second line 11, so that the electrical length design requirements of the sixth microstrip line 6 and the seventh microstrip line 7 can be met by bending the sixth microstrip line 6 and the seventh microstrip line 7, meanwhile, the area of the filter is reduced, and the expected filtering function of the filter is not affected.
Further, the first port 22 is further provided with an eighth microstrip line 8 coupled in parallel with the first line 10, and the eighth microstrip line 8 and the sixth microstrip line 6 are respectively disposed on two sides of the first line 10; the second port 23 is further provided with a ninth microstrip line 9 coupled in parallel with the second line 11, and the ninth microstrip line 9 and the seventh microstrip line 7 are respectively located on two sides of the second line 11. In the actual design, the coupling degree between the sixth microstrip line 6 and the seventh microstrip line 7 and the coupling line group is small, and the coupling degree between the eighth microstrip line 8 and the ninth microstrip line 9 and the coupling line group is large. And the selection and the transmission of microwaves between the feed port group and the multimode resonator in the filter are realized through the coupling effect.
Further, the electrical lengths of the first line 10, the second line 11, the first microstrip line 1, the second microstrip line 2, the third microstrip line 3, the fourth microstrip line 4, the fifth microstrip line 5, the eighth microstrip line 8 and the ninth microstrip line 9 are all equal; the characteristic impedances of the second microstrip line 2 and the third microstrip line 3 are equal. In a practical product, the first passband edge and the fourth passband edge generated by the filter of the structure can be adjusted with the same amplitude, and the second passband edge and the third passband edge are not changed.
Further, the inductor also comprises a first inductor 15 and a second inductor 16; the second microstrip line 2 is connected with the direct current power supply 14 through the first inductor 15; the third microstrip line 3 is connected to the dc power supply 14 through the second inductor 16. The first inductor 15 and the second inductor 16 are used for ensuring the direct current power to pass through, simultaneously eliminating the influence of the feeding of the direct current power supply 14 on the microwave signal, ensuring the stability of the current passing through the first diode 12 and/or the second diode 13, and further ensuring the stability of the microwave selection of the filter.
Further, the microstrip line 1 further comprises a resistor 17, and the first microstrip line is connected to the metal floor 21 through the resistor 17. Due to the spacing between the first microstrip line 1 and the metal floor 21 by the dielectric plate 20, the first microstrip line and the metal floor need to be connected together by the via hole 18 to form a complete direct current closed circuit, so as to control the working states of the first diode 12 and the second diode 13. The resistor 17 is arranged to ensure that the direct current power passes through, protect the first diode 12 and the second diode 13 from being damaged by the over-high voltage current, and eliminate the influence of the perforated via hole 18 on the microwave signal.
Furthermore, the characteristic impedances of the first port 22 and the second port 23 are both 50 Ω, so that the filter and other devices can be directly connected together without causing excessive signal energy loss, and meanwhile, the performance of the filter is ensured not to be changed due to the addition of a working microstrip line.
Further, the dielectric plate 20 has a thickness of 0.813mm and a dielectric constant of 3.38. The dielectric plate 20 may be selected from RO4003C by rogers and has a dielectric loss of 0.0022.
According to the above embodiment, simulation and test are performed for three different operating states, namely, Case a, Case B, and Case C, respectively, wherein the simulation and test results for Case a are shown in fig. 5, the simulation and test results for Case B are shown in fig. 6, the simulation and test results for Case C are shown in fig. 7, the test results for three different operating states, namely, Case a, Case B, and Case C are shown in fig. 8, and the simulation and test results for four passband sides in three different operating states, namely, Case a, Case B, and Case C are shown in table 2, wherein the transmission loss is 3-dB.
As can be seen from the results in fig. 5 to fig. 8 and table 2, the first passband edge and the fourth passband edge may be adjusted by the same amplitude, and the second passband edge and the third passband edge may not change substantially during the adjustment of the operating structural mode of the multimode resonator, i.e., the operating center frequency band of the wireless communication system using the filter may not change with the change of the operating structural mode of the multimode resonator. The filter has excellent selectivity on microwaves in two adjustable working bandwidths, namely the microwaves in the working bandwidths are input from the input end and then output from the output end through the all-pass filter, and cannot be reflected from the output end and output from the input end through the filter; and the microwave outside the working bandwidth can not pass through the filter after being input from the input end, and can not be output from the output end, namely, the in-band interference can be effectively prevented.
TABLE 2
The operating band frequency ranges referred to in fig. 4 to 8 above are only one possibility of the operating band frequency ranges of the filter, and the operating band frequency ranges of the actual products can be adjusted and selected according to actual needs.
In summary, the reconfigurable filter with adjustable dual-passband bandwidth provided by the invention indirectly controls the number of microstrip lines participating in work in the multimode resonator by controlling whether power is supplied to the first diode and/or the second diode, so as to obtain various working structure modes of the multimode resonator, and further realize the change of the passband bandwidth of the filter. The change of the passband bandwidth is only the change of the first passband edge and the fourth passband edge, and the second passband edge and the third passband edge are not changed. The change of the direct current power supply does not disturb the filter, and the current effectively passes through the first diode and the second diode. The via hole for the first microstrip line does not interfere with the filter. The feeding port group is connected with external equipment, and the performance of the filter is not influenced. The filter can be directly processed and molded on a core plate, and a finished product has the characteristics of low section, small volume, light weight and the like, is low in processing cost, and can be applied to a modern multifunctional wireless communication system; the wireless communication system can be ensured to have fixed center frequency under different working states, and in-band interference is effectively prevented.
Here, the first and second … … represent only the distinction of their names and do not represent what the degree of importance and the position of the first, second, third and fourth passband edges are different, except that the first, second, third and fourth passband edges represent their positional relationships.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A dual-passband bandwidth-adjustable reconfigurable filter comprises a microstrip structure layer, a dielectric plate and a metal floor which are sequentially stacked; the microstrip structure layer comprises a multimode resonator, a coupling line group and a feed port group, and the feed port group is coupled with the multimode resonator through the coupling line group; the multimode resonator comprises a first microstrip line, a second microstrip line, a third microstrip line and a fourth microstrip line; the first microstrip line is connected with the metal floor; one end of the first microstrip line is connected with the coupling line group, and the other end of the first microstrip line is respectively connected with the first diode, the second diode and the fourth microstrip line; the first diode is connected with the direct current power supply through the second microstrip line, and the second diode is connected with the direct current power supply through the third microstrip line; the first diode and the second diode are both switch diodes.
2. The dual-passband bandwidth-adjustable reconfigurable filter of claim 1, wherein a fifth microstrip line for eliminating the pole of the multimode resonator is further connected to the connection end of the first microstrip line and the coupling line group.
3. The dual-passband bandwidth-adjustable reconfigurable filter of claim 2, wherein the set of feed ports comprises a first port and a second port, and the set of coupling lines comprises a first line and a second line; the first port is provided with an electrical length coupled to the first wire ofƟ 1The second port is provided with an electrical length coupled with the second line ofƟ 2The seventh microstrip line of (1), wherein, the angle is less than or equal to 75 DEGƟ 1<105°，75°<Ɵ 2≤105°，Ɵ 1<Ɵ 2。
4. The dual-passband bandwidth-adjustable reconfigurable filter of claim 3, wherein one end of the sixth microstrip is coupled in parallel with the first line, and the other end of the sixth microstrip is coupled in parallel with the first microstrip after being bent; one end of the seventh microstrip line is coupled with the second line in parallel, and the other end of the seventh microstrip line is coupled with the first microstrip line in parallel after being bent.
5. The dual-passband bandwidth-adjustable reconfigurable filter of claim 4, wherein the first port is further provided with an eighth microstrip line coupled in parallel with the first line, and the eighth microstrip line and the sixth microstrip line are respectively disposed on two sides of the first line; the second port is further provided with a ninth microstrip line coupled in parallel with the second line, and the ninth microstrip line and the seventh microstrip line are arranged on two sides of the second line.
6. The dual-passband bandwidth-adjustable reconfigurable filter of claim 5, wherein the first line, the second line, the first microstrip line, the second microstrip line, the third microstrip line, the fourth microstrip line, the fifth microstrip line, the eighth microstrip line and the ninth microstrip line have equal electrical lengths; the characteristic impedance of the second microstrip line is equal to that of the third microstrip line.
7. The dual-passband bandwidth-adjustable reconfigurable filter of claim 6, further comprising a first inductor and a second inductor; the second microstrip line is connected with the direct-current power supply through the first inductor; the third microstrip line is connected with the direct current power supply through the second inductor.
8. The dual-passband bandwidth-adjustable reconfigurable filter of claim 7, further comprising a resistor, wherein the first microstrip line is connected with the metal ground via the resistor.
9. The dual-passband bandwidth-adjustable reconfigurable filter according to any one of claims 4 to 8, wherein the characteristic impedance of the first port and the characteristic impedance of the second port are both 50 Ω.
10. The dual-passband bandwidth-adjustable reconfigurable filter of claim 9, wherein the dielectric plate has a thickness of 0.813mm and a dielectric constant of 3.38.
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