阅读说明：本技术 一种双通带带宽可调的可重构滤波器 (Dual-passband bandwidth-adjustable reconfigurable filter ) 是由 毕晓坤 张晓� 谭挺艳 袁涛 于 2019-10-28 设计创作，主要内容包括：本发明提供一种双通带带宽可调的可重构滤波器,包括依次层叠的微带结构层、介质板和金属地板,还包括第一二极管、第二二极管和直流电源；所述微带结构层包括多模谐振器、耦合线组和馈电端口组,所述馈电端口组通过所述耦合线组与所述多模谐振器耦合；所述多模谐振器包括第一微带线、第二微带线、第三微带线和第四微带线；所述第一微带线与所述金属地板连接；所述第一微带线的一端与所述耦合线组连接,另一端分别与所述第一二极管、所述第二二极管、所述第四微带线连接；所述第一二极管通过所述第二微带线与所述直流电源连接,所述第二二极管通过所述第三微带线与所述直流电源连接。该滤波器的两个通带带宽以相同幅度可调,有效阻止带内干扰。(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.)

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.

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. Such asThe dual-passband bandwidth-adjustable reconfigurable filter of claim 1 or 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 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。

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 impedances of the second microstrip line and the third microstrip line are equal.

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.

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 impedances of the second microstrip line and the third microstrip line are equal.

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.