CN105070986B - Dielectric dual-mode bandpass filter based on patch structure - Google Patents

Abstract

The invention discloses a dielectric dual-mode band-pass filter based on a patch structure, which comprises a cavity, wherein a dielectric resonator is arranged at the center of the cavity, and the upper end and the lower end of the dielectric resonator are connected with the cavity; a first metal patch and a second metal patch are pasted on the outer side face of the dielectric resonator, the transverse center line of the first metal patch is perpendicular to the transverse center line of the second metal patch, and the first metal patch and the second metal patch are used for controlling the resonant frequency of two resonant modes of the dielectric resonator; and a third metal patch is attached to the intersection of the magnetic field distributions of the two resonant modes of the dielectric resonator, and the third metal patch is used for controlling the coupling strength between the two resonant modes of the dielectric resonator. The dielectric dual-mode band-pass filter has a simple structure and is convenient to realize, the metal patches are pasted at different positions of one dielectric resonator, and the frequency control of a resonance mode can be realized by adjusting the size of the metal patches.

Description

Dielectric dual-mode bandpass filter based on patch structure

technical field

The invention relates to a dual-mode bandpass filter, in particular to a dielectric dual-mode bandpass filter based on a patch structure, belonging to the technical field of microwave communication.

Background technique

In today's highly developed science and technology, the interactive dissemination of information plays an extremely important role. Microwave filters are the key technology of wireless communication systems, and provide the central frequency selection function for communication systems working in the microwave frequency band. In the narrow bandwidth of the communication frequency band, microwave filters have strict requirements: high rectangularity frequency selection characteristics, high rejection out-of-band suppression, multi-mode passband, high-performance return loss, low insertion loss, large Power capacity; in industrial production and application, microwave filters are expected to be easy to process and produce, small in size, light in weight, and good in thermal stability. Dielectric multimode filters can better fulfill these requirements. In practical applications, dielectric multimode filters often face technical difficulties in processing. Traditional dielectric multimode filters use angle cutting technology or screw technology to achieve coupling and frequency control between modes, which requires digging holes and cutting angles on the dielectric block, which brings technical difficulties to processing and increases processing costs. .

According to investigation and understanding, the existing technologies that have been disclosed are as follows:

1) In 2013, Ke-Li Wu and others published "ADual-Mode Dielectric Resonator Filter With Planar Coupling Configuration" on IEEE Trans.Microwave.Theory Tech. The article uses two TM11 degenerate modes of a disk-shaped dielectric resonator, By digging holes in the dielectric resonator and inserting metal screws, the control of the frequency of the two modes and the control of the coupling strength between the modes are realized, thereby designing a dielectric dual-mode filter. The advantage of this structure is that the structure is simple and clear, and it is easy to use the planar topology to design multi-order filters; the disadvantage is that digging holes brings difficulties to the processing of the dielectric resonator.

2) In 2012, Japanese scholars S.Yakuno and T.Ishizaki published "Novel Cavity-Type Multi-Mode Filter using TEM-mode and TE-mode" on Microwaves Conference Proceedings (APMC). The article uses two cylindrical dielectric resonators, By reasonably controlling the distance between the two dielectric resonators, the TEM mode can be excited in the two degenerate TE11 modes, and a screw can be inserted at the intersection of the electric field of the resonant mode to control the coupling between the modes, thereby designing a three-mode single-cavity filter. The disadvantage is that it is not suitable for designing a multi-cavity structure, so the out-of-band suppression is not high.

3) In 2004, foreign scholars M.M.Rahman and Weili Wang published "A Compact Triple-mode Plated Ceramic Block Based HybridFilter for Base-stationApplication" on the 34th MicrowaveConference. Coupling of degenerate modes, while using screws to control the resonance frequency of each mode, and finally silver-plating the dielectric block. At the same time, the article also uses a coaxial filter to suppress high-order modes. The advantage of this structure is the use of multi-cavity structure and coaxial cavity, which improves the out-of-band suppression and suppresses the high-order mode, and the return loss is also very good. It is extremely difficult to perform corner cutting and digging operations.

4) In 2002, foreign scholars V.Walker and I.C.Hunter published "Design of Triple Mode TE01d Resonator Transmission Filters" on Microwaves and Wireless Component Letters. The article used a cuboid dielectric resonator and adopted three TE01d degenerate modes , A metal disc is used to control the frequency changes of the three resonant modes, and the mode coupling is achieved by cutting the corner of the dielectric block and metal screws.

To sum up, the published dielectric multimode filter articles or patent documents mostly involve cutting corners or digging holes on the dielectric block. The proposed method and structure processing technology are difficult and costly, and the published dielectric multimode Filter articles or patent documents mostly involve single-cavity dielectric multimode filters with complex structures, which are not suitable for the design of multi-order multi-cavity high-performance filters, and the performance of the proposed method and structure is limited.

Contents of the invention

The purpose of the present invention is to solve the defects of the above-mentioned prior art, and to provide a dielectric dual-mode bandpass filter based on a patch structure. The filter has a simple structure and is easy to implement. Patch, the frequency control of the resonant mode can be achieved by adjusting the size of the metal patch.

The purpose of the present invention can be achieved by taking the following technical solutions:

A dielectric dual-mode bandpass filter based on a patch structure, including a cavity, a dielectric resonator is placed at the center of the cavity, and the upper and lower ends of the dielectric resonator are connected to the cavity;

The outer surface of the dielectric resonator is pasted with a first metal patch and a second metal patch, the transverse centerline of the first metal patch is perpendicular to the transverse centerline of the second metal patch, and the first The metal patch and the second metal patch are used to control the resonance frequencies of the two resonance modes of the dielectric resonator;

The dielectric resonator is attached with a third metal patch at the intersection of the magnetic field distributions of the two resonance modes, and the third metal patch is used to control the coupling strength between the two resonance modes of the dielectric resonator.

As an implementation, the cavity is provided with a first port at a position opposite to the first metal patch, a first coaxial line is provided at the first port, and the gap between the first port and the dielectric resonator A first metal ring is provided, one end of the first metal ring is connected to the inner conductor of the first coaxial line, and the other end is connected to the bottom surface of the cavity; the first metal ring is used to control the relationship between the first port and the excited resonant mode the coupling strength;

The cavity is provided with a second port at a position opposite to the second metal patch, a second coaxial line is provided at the second port, and a second metal is provided between the second port and the dielectric resonator. One end of the second metal ring is connected to the inner conductor of the second coaxial line, and the other end is connected to the bottom surface of the cavity; the second metal ring is used to control the coupling strength between the second port and the excited resonant mode.

As an embodiment, the cavity is a cylindrical cavity or a polygonal cavity.

As an implementation, the dielectric resonator is a disk-shaped dielectric resonator, a cylindrical dielectric resonator or a polygonal dielectric resonator.

As an implementation, the polygonal dielectric resonator is a rectangular dielectric resonator; when the dielectric resonator is a rectangular dielectric resonator, the first metal patch and the second metal patch are respectively arranged on the rectangular dielectric resonator on two adjacent outer surfaces.

As an embodiment, the first metal patch and the second metal patch are circular metal patches, circular metal patches or polygonal metal patches.

As an implementation, the third metal patch is a circular metal patch or a polygonal metal patch.

As an embodiment, the first metal ring and the second metal ring are circular rings or rectangular rings.

Compared with the prior art, the present invention has the following beneficial effects:

1. The dielectric dual-mode bandpass filter of the present invention is based on patch technology, and metal patches are pasted on different positions of a dielectric resonator, thereby controlling the resonance frequency of the resonant mode and the coupling strength between the resonant modes, utilizing the metal patch Instead of cutting corners and screws, it can solve the processing problem of the dielectric block and greatly reduce the difficulty of processing. The dielectric dual-mode filter based on the patch structure designed by this technology has high performance, and the structure is also relatively Simple and easy to implement.

2. The dielectric dual-mode bandpass filter of the present invention has a metal patch on the outer surface of the dielectric resonator, and the resonant frequency of the resonant mode can be controlled by adjusting the size of the metal patch; the magnetic field of the two resonant modes of the dielectric resonator A metal patch is pasted at the intersection of the distribution, and the coupling strength between the resonant modes can be controlled by adjusting the size of the metal patch; a metal ring is set between the port of the cavity and the dielectric resonator, and the area of the metal ring can be controlled by changing the area of the metal ring. Port coupling strength, that is, the coupling strength between the port and the excited resonant mode.

3. Due to the adoption of the metal patch technology, the present invention makes the designed single-cavity dielectric dual-mode filter simple in structure, thereby facilitating the design of multi-order multi-cavity bandpass filters by using planar topology technology, which can achieve higher out-of-band rejection , higher passband rectangularity and other high-performance bandpass filter indicators, and at the same time it is convenient to introduce transmission zeros, which can further improve the performance of the filter, and solve the problem that the existing single-cavity dielectric multimode filter has a complex structure and is not suitable for multi-order multi-cavity High-performance filter design, the problem of limited performance achieved.

Description of drawings

Fig. 1 is a front perspective structure diagram of a dielectric dual-mode bandpass filter according to Embodiment 1 of the present invention.

FIG. 2 is a three-dimensional structural view of the back of the dielectric dual-mode bandpass filter according to Embodiment 1 of the present invention.

FIG. 3 is a structural diagram of a dielectric resonator placed in a cavity according to Embodiment 1 of the present invention.

FIG. 4 is a magnetic field distribution diagram of the TM120 mode of Embodiment 1 of the present invention.

FIG. 5 is a magnetic field distribution diagram of the TM210 mode of Embodiment 1 of the present invention.

FIG. 6 is a structural view of the dielectric resonator according to Embodiment 1 of the present invention with a metal patch attached to the rear side.

FIG. 7 is a graph showing the resonance frequency control of the TM120 mode in Embodiment 1 of the present invention.

FIG. 8 is a structural view of the dielectric resonator according to Embodiment 1 of the present invention with a metal patch attached to the left side.

FIG. 9 is a graph showing the resonant frequency control of the TM210 mode in Embodiment 1 of the present invention.

FIG. 10 is a structural diagram of a dielectric resonator according to Embodiment 1 of the present invention where a metal patch is pasted at the intersection of the magnetic field distributions of two resonant frequencies.

Fig. 11 is a graph showing the coupling strength control curve between the TM120 mode and the TM210 mode in Example 1 of the present invention.

Fig. 12 is a structural diagram of a metal ring disposed between the first port and the dielectric resonator in Embodiment 1 of the present invention.

Fig. 13 is a graph showing the end coupling strength control curve of Embodiment 1 of the present invention.

FIG. 14 is an S parameter response curve of the dielectric dual-mode bandpass filter according to Embodiment 1 of the present invention.

FIG. 15 is a fourth-order linear topology structure diagram of Embodiment 2 of the present invention.

Fig. 16 is a plane structure diagram of a linear topology dual-mode dual-cavity dielectric bandpass filter according to Embodiment 2 of the present invention.

Fig. 17 is a graph showing inter-cavity coupling control achieved by metal rings in the linear topology dual-mode dual-cavity dielectric bandpass filter according to Embodiment 2 of the present invention.

Fig. 18 is an S-parameter response curve of the linear topology dual-mode dual-cavity dielectric bandpass filter according to Embodiment 2 of the present invention.

FIG. 19 is an eighth-order linear topology structure diagram of Embodiment 3 of the present invention.

Fig. 20 is a plane structure diagram of a linear topology dual-mode four-cavity dielectric bandpass filter according to Embodiment 3 of the present invention.

Fig. 21 is an S-parameter response curve of a linear topology dual-mode four-cavity dielectric bandpass filter according to Embodiment 3 of the present invention.

FIG. 22 is a diagram of a fourth-order crossover topology according to Embodiment 4 of the present invention.

Fig. 23 is a plane structure diagram of a crossover topology dual-mode dual-cavity dielectric bandpass filter according to Embodiment 4 of the present invention.

FIG. 24 is a front view of the structure at point A shown in FIG. 23 .

Fig. 25 is an S-parameter response curve of the crossover topology dual-mode dual-cavity dielectric bandpass filter according to Embodiment 4 of the present invention.

FIG. 26 is a diagram of an eighth-order crossover topology according to Embodiment 5 of the present invention.

Fig. 27 is a plane structure diagram of a dual-mode four-cavity dielectric bandpass filter with a crossover topology according to Embodiment 5 of the present invention.

Fig. 28 is a schematic view of the front structure at B shown in Fig. 27 .

Fig. 29 is an S-parameter response curve of a dual-mode four-cavity dielectric bandpass filter with a crossover topology according to Embodiment 5 of the present invention.

Among them, 1-cavity, 2-dielectric resonator, 3-first metal patch, 4-second metal patch, 5-third metal patch, 6-first coaxial line, 7-first metal ring , 8-the second coaxial line, 9-the second metal ring.

detailed description

The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example 1:

As shown in Figures 1 and 2, the dielectric dual-mode bandpass filter of this embodiment includes a cavity 1, which is a rectangular cavity with a size of 30mm*30mm*10mm, located at the center of the cavity 1 Place a dielectric resonator 2, the upper and lower ends of the dielectric resonator 2 are connected to the cavity 1, and the two degenerate modes (i.e. resonance modes) adopted by the dielectric resonator 2 are called TM120 mode and TM210 mode;

The dielectric resonator 2 is a rectangular dielectric resonator with a size of 20mm*20mm*10mm and a dielectric relative permittivity of 21.4. On the two adjacent outer surfaces of the dielectric resonator 2 (in this embodiment, the two outer surfaces The first metal patch 3 and the second metal patch 4 are pasted on the side (rear side and left side), and it can be seen that the transverse centerline of the first metal patch 3 and the transverse centerline of the second metal patch 4 Vertically, the first metal patch 3 and the second metal patch 4 are used to control the resonance frequency of the two resonance modes of the dielectric resonator 2, wherein the first metal patch 3 controls the resonance frequency of the TM120 mode, and the second The metal patch 4 controls the resonant frequency of the TM210 mode;

The dielectric resonator 2 is pasted with a third metal patch 5 at the intersection of the magnetic field distributions of the two resonant modes (TM120 mode and TM210 mode); The intersection of the rear side and the left side of the back side is the intersection of the magnetic field distribution of the two resonant modes. Since the first metal patch 3 in this embodiment is located on the back side, and the second metal patch 4 is located on the left side, the second metal patch 4 is located on the left side, so the first Three metal patches 5 are pasted at the intersection of the front side and the right side of the dielectric resonator 2, and the third metal patch 5 is used to control the coupling strength between the two resonance modes of the dielectric resonator 2;

The cavity 1 is provided with a first port at a position opposite to the first metal patch 3, a first coaxial line 6 is provided at the first port, and a first port and the dielectric resonator 2 are provided with The first metal ring 7, one end of the first metal ring 7 is connected to the inner conductor of the first coaxial line 6, and the other end is connected to the bottom surface of the cavity 1; the first metal ring 7 is used to control the resonance between the first port and the excitation The coupling strength between modes (TM120 mode), that is, the end coupling strength;

The cavity 1 is provided with a second port at a position opposite to the second metal patch 4, a second coaxial line 8 is provided at the second port, and a second port is provided between the second port and the dielectric resonator 2. There is a second metal ring 9, one end of the second metal ring 9 is connected to the inner conductor of the second coaxial line 8, and the other end is connected to the bottom surface of the cavity 1; the second metal ring 9 is used to control the second port and the excitation The coupling strength between the resonant modes (TM210 mode), that is, the end coupling strength.

The first port and the second port can be used as input ports or output ports.

The analysis process of the design of the dielectric dual-mode bandpass filter of the present embodiment is as follows:

1) A dielectric resonator 2 is placed in the center of the cavity 1, and the upper and lower ends of the dielectric resonator 2 are directly connected to the cavity 1, as shown in Figure 3; two degenerate The modes are called TM120 mode and TM210 mode, and the magnetic field distributions of the two resonant modes are shown in Figure 4 and Figure 5.

2) By affixing a metal patch on the outer surface of the dielectric resonator 2, the resonance frequency control of the resonance mode can be realized. The metal patch can be a circular metal patch, an annular metal patch or a polygonal metal patch. In this embodiment A circular metal patch is used for illustration. In this embodiment, a first metal patch 3 is pasted on the rear side of the dielectric resonator 2, as shown in FIG. 6; by adjusting the size of the first metal patch 3, the corresponding resonance can be controlled. The resonant frequency of the mode, as shown in Figure 7, the first metal patch 3 can control the resonant frequency of the TM120 mode, as the size of the first metal patch 3 increases, this is reflected in the increase of the radius (TM120_r), and the TM120 mode The resonant frequency of the TM210 mode drops rapidly, while the resonant frequency of the TM210 mode basically remains unchanged; according to the symmetry of the structure, if the metal patch is placed on the adjacent plane, as shown in Figure 8, this embodiment is in the dielectric resonator 2 If there is a second metal patch 4 attached to the left side, the resonant frequency of the TM210 mode can be controlled, as shown in Figure 9, as the radius of the second metal patch 4 (TM210_r) increases, the resonant frequency of the TM210 mode decreases The resonant frequency of the TM120 mode remains unchanged.

3) By affixing a metal patch at the intersection of the magnetic field distributions of the two resonant modes, the coupling strength of the two resonant modes can be controlled. The metal patch can be a circular metal patch or a polygonal metal patch. In this embodiment, Rectangular metal patch for illustration, a third metal patch 5 is pasted at the intersection of the magnetic field distributions of the two resonant frequencies of the dielectric resonator 2, as shown in Figure 10, the third metal patch 5 of this embodiment is located in the dielectric resonator 2 at the intersection of the front side and the right side; the third metal patch 5 controls the coupling strength between the TM120 mode and the TM210 mode, as shown in Figure 11, as the size of the rectangular metal patch increases, this is reflected in the width ( patch_w) increases, the coupling coefficient of the two resonant modes also increases.

4) In order to achieve end coupling and excite the first mode, the method used here is metal ring coupling, that is, magnetic coupling; the method of magnetic coupling, the metal ring must be perpendicular to the magnetic field distribution of the resonant mode to be excited, the metal ring It can be a circular ring or a rectangular ring. This embodiment uses a rectangular ring for illustration; as shown in FIG. The inner conductor of the coaxial line 6, the other end is connected to the bottom surface of the cavity 1, the mode excited by the first metal ring 7 is the TM120 mode, the area of the first metal ring 7 controls the coupling strength of the end, and the external Q value (quality factor), as the area of the first metal ring 7 increases, here it is reflected that the width (port-ring_w) of the first metal ring 7 increases, and the external Q value decreases, as shown in Figure 13 (the The figure omits the inner conductor of the first coaxial line 6 and the thickness of the first metal ring 7), which shows that the larger the area of the first metal ring 7, the stronger the end coupling, and the wider the passband bandwidth that can be achieved.

Similarly, in order to excite the second mode, a second metal ring 9 is provided between the first port and the dielectric resonator 2, one end of the second metal ring 9 is connected to the inner conductor of the second coaxial line 8, and the other end is connected to On the bottom of the cavity 1 , the mode excited by the second metal ring 9 is the TM210 mode, and the control of the end coupling strength is the same as that of the first metal ring 7 .

5) Under the analysis of the above 1) ~ 4), the resonant frequency of the resonant mode and the coupling coefficient between the resonant modes can be controlled by the metal patch technology, and the external Q value can be controlled by the metal ring coupling, so the design of this The dielectric dual-mode bandpass filter of the embodiment, as shown in Figure 1 and Figure 2, the S parameter response result of the dielectric dual-mode bandpass filter is as shown in Figure 14 (in the figure S11 parameter refers to the return loss of the input port , the S21 parameter refers to the forward transfer coefficient from the input port to the output port).

Example 2:

This embodiment is based on the two dielectric dual-mode bandpass filters of the above-mentioned embodiment 1, using the four-mode filter as shown in Figure 15 (S in the figure represents the source end, L represents the load end, and 1 to 4 represent modes 1 to 4, respectively). order linear topology, a linear topology dual-mode dual-cavity dielectric bandpass filter can be designed, as shown in Figure 16, where the coupling method of mode 2 and mode 3 is to achieve mode coupling through a closed metal ring, and the size of the metal ring (width ring_w , height ring_h) to control the size of the coupling coefficient, as shown in Figure 17; the S parameter response of the linear topology dual-mode dual-cavity dielectric bandpass filter is shown in Figure 18, as can be seen from the figure, in the bandwidth of 2634MHz-2698MHz , The passband return loss is below -15.6dB.

Example 3:

This embodiment is based on the four dielectric dual-mode bandpass filters of Embodiment 1 above, using the eighth-order Linear topology, a linear topology dual-mode four-cavity dielectric bandpass filter can be designed, as shown in Figure 20, where the coupling methods of mode 2 and mode 3, mode 4 and mode 5, mode 6 and mode 7 are through closed metal The ring realizes mode coupling, and the size of the metal ring controls the size of the coupling coefficient; the S-parameter response of the linear topology dual-mode four-cavity dielectric bandpass filter is shown in Figure 21. It can be seen from the figure that in the bandwidth of 2632MHz-2699MHz, the pass With return loss below -12.2dB.

Example 4:

This embodiment is based on the two dielectric dual-mode bandpass filters of the above-mentioned embodiment 1, using the four-mode filter as shown in Figure 22 (S in the figure represents the source end, L represents the load end, and 1 to 4 represent modes 1 to 4, respectively). order crossover topology, a crossover topology dual-mode dual-cavity dielectric bandpass filter can be designed, as shown in Figure 23, in which mode 2 and mode 3 achieve mode coupling through a closed metal ring, and the size of the metal ring controls the size of the coupling coefficient; in addition Mode 2 and Mode 3 also introduce electrical coupling through probes to achieve cross-coupling and introduce two opposite-side transmission zeros. The electrical coupling structure is shown in Figure 24. The metal at both ends is not grounded, and the metal column in the middle acts as a support. The size of the electrical coupling strength is controlled by two factors, one is the length of the metal at both ends, and the other is the distance between the entire electrical coupling structure and the adjacent dielectric resonator; the S of the cross-type dual-mode dual-cavity dielectric bandpass filter The parameter response is shown in Figure 25. It can be seen from the figure that, in the bandwidth of 2638MHz-2701MHz, the passband return loss is below -13.6dB.

Example 5:

This embodiment is based on the four dielectric dual-mode bandpass filters of the above-mentioned embodiment 1, using the eight-mode filter as shown in Figure 26 (in the figure, S represents the source end, L represents the load end, and 1 to 8 represent modes 1 to 8 respectively). order crossover topology, a crossover topology dual-mode four-cavity dielectric bandpass filter can be designed, as shown in Figure 27, in which mode 2 and mode 3, mode 4 and mode 5, mode 6 and mode 7 are realized by closed metal rings Coupling, the size of the metal ring controls the size of the coupling coefficient; in addition, mode 3 and mode 6 also introduce electrical coupling through the probe to achieve cross-coupling and introduce two transmission zeros on opposite sides. The electrical coupling structure is shown in Figure 28. The metal is not grounded, and the metal pillar in the middle acts as a support. The strength of the electrical coupling is controlled by two factors, one is the length of the metal at both ends, and the other is the distance between the entire electrical coupling structure and the adjacent dielectric resonator; the cross The S-parameter response of the dual-mode four-cavity dielectric bandpass filter is shown in Figure 29. It can be seen from the figure that the passband return loss is below -14.2dB in the bandwidth of 2636MHz-2694MHz.

Embodiment 6:

The main features of this embodiment are: the cavity can also be a cylindrical cavity or a polygonal cavity other than a rectangle, and the dielectric resonator can also be a disk-shaped dielectric resonator, a cylindrical dielectric resonator, or a cavity other than a rectangle. polygonal dielectric resonator.

In summary, the present invention innovatively proposes the frequency control of the resonant mode by the metal patch technology, and the control of the coupling strength between the modes by the metal patch technology. This patch technology fills the current dielectric multimode filter technology Part of the research is blank, which greatly reduces the processing difficulty and processing cost of the dielectric resonator. In addition, a multi-order multi-cavity bandpass filter can be designed using a dielectric dual-mode bandpass filter and a planar topology, which can achieve higher out-of-band rejection, higher passband squareness and other high-performance bandpass filter indicators; at the same time, the planar The topology structure can realize the cross-coupling of paths, introduce transmission zeros, and further improve the performance of the filter. Since the designed multi-order multi-cavity bandpass filter can have many types (the above-mentioned embodiments 2-5), it can better It satisfies the application of the existing wireless communication system.

The above is only a preferred embodiment of the patent of the present invention, but the scope of protection of the patent of the present invention is not limited thereto. Equivalent replacements or changes to the technical solutions and their inventive concepts all fall within the scope of protection of the invention patent.

Claims (7)

1. the medium bimodule band-pass filter based on paster structure, including cavity, it is characterised in that：The center of the cavity A dielectric resonator is placed, the upper/lower terminal of the dielectric resonator directly connects with cavity；

The first metal patch and the second metal patch are posted on the lateral surface of the dielectric resonator, first metal patch Cross central line is vertical with the cross central line of the second metal patch, and first metal patch and the second metal patch are used to control The resonant frequency of two modes of resonance of dielectric resonator processed, be specially：By adjusting the size of the first metal patch, control The resonant frequency of TM120 patterns, by adjusting the size of the second metal patch, controls the resonant frequency of TM210 patterns；

The dielectric resonator posts the 3rd metal patch, the 3rd metal at the Distribution of Magnetic Field place of accompanying each other of two modes of resonance Paster is used to control the stiffness of coupling between two modes of resonance of dielectric resonator, is specially：By adjusting the 3rd metal patch Size, control two modes of resonance between stiffness of coupling.

2. the medium bimodule band-pass filter according to claim 1 based on paster structure, it is characterised in that：

The cavity is provided with same provided with first at first port, the first port on the position relative with the first metal patch The first becket is provided between axis, and first port and dielectric resonator, a termination first of first becket is coaxial The inner wire of line, the bottom surface of another termination cavity；First becket is used to control first port and the mode of resonance of excitation Between stiffness of coupling；

The cavity is provided with same provided with second at second port, the second port on the position relative with the second metal patch The second becket is provided between axis, and second port and dielectric resonator, a termination second of second becket is coaxial The inner wire of line, the bottom surface of another termination cavity；Second becket is used to control second port and the mode of resonance of excitation Between stiffness of coupling.

3. the medium bimodule band-pass filter according to claim 1 or 2 based on paster structure, it is characterised in that：It is described Cavity is cylindrical cavity or polygon cavity.

4. the medium bimodule band-pass filter according to claim 1 or 2 based on paster structure, it is characterised in that：It is described Dielectric resonator is cylindrical di resonator or Rectangular Enclosure with Participating Media resonator, when the dielectric resonator is Rectangular Enclosure with Participating Media resonator, First metal patch and the second metal patch are separately positioned on two adjacent lateral surfaces of Rectangular Enclosure with Participating Media resonator.

5. the medium bimodule band-pass filter according to claim 1 or 2 based on paster structure, it is characterised in that：It is described First metal patch and the second metal patch are circular metal patch, endless metal paster or polygon metal patch.

6. the medium bimodule band-pass filter according to claim 1 or 2 based on paster structure, it is characterised in that：It is described 3rd metal patch is circular metal patch or polygon metal patch.

7. the medium bimodule band-pass filter according to claim 2 based on paster structure, it is characterised in that：Described first Becket and the second becket are annulus or straight-flanked ring.