WO2016177086A1

WO2016177086A1 - Filter, filtering method and storage medium

Info

Publication number: WO2016177086A1
Application number: PCT/CN2016/075951
Authority: WO
Inventors: 李建
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-07-28
Filing date: 2016-03-09
Publication date: 2016-11-10
Also published as: CN106410334A

Abstract

Provided is a filter, comprising: an input port, an output port, a shielding housing, a dielectric, at least two layers of half-wavelength resonant units, at least one layer of quarter-wavelength resonant unit, and at least three layers of grounding resonant units. The half-wavelength resonant units and the quarter-wavelength resonant unit are connected in parallel between the input port and the output port. One end of the first layer of half-wavelength resonant unit is connected to the input port, and the other end is floating. One end of the last layer of half-wavelength resonant unit is connected to the output port, and the other end is floating. Both ends of the remaining half-wavelength resonant unit other than the first layer and the last layer of the half-wavelength resonant units are floating. One end of the quarter-wavelength resonant unit is grounded via the shielding housing, and the other end is floating. The grounding resonant units respectively surround the half-wavelength resonant unit and the quarter-wavelength resonant units. The inner sides of the grounding resonant units are floating while the outer sides are grounded via the shielding housing. Also provided are a filtering method and storage medium.

Description

Filter, filter method and storage medium

Technical field

The invention relates to the technical field of millimeter wave band filtering, in particular to a millimeter band narrow band filter, a millimeter band narrow band filtering method and a storage medium.

Background technique

With the development of microwave communication and radar systems, mobile handheld wireless communication terminals and individual intelligent weapon systems, aerospace and aerospace communication systems have placed high demands on the size and performance of microwave devices. At present, the miniature millimeter wave bandpass filter is the core component of the electronic system, and its performance often directly affects the performance index of the entire electronic system. While miniaturizing the device, LTCC technology has emerged in order not to reduce its loss and achieve a higher quality factor.

Although the current millimeter wave LTCC filter technology is relatively mature, the volume of the LTCC narrowband filter can be millimeter-scale according to the frequency characteristics of the millimeter wave band. However, in the prior art, in order to reduce the strip line of each resonant unit, The coupling strength between the two increases the length in the Z direction, resulting in the LTCC narrowband filter being too high in height and physically inflexible.

In addition, at present, the low-band spectrum of 450MHz to 2.6GHz has almost been applied to the field of mobile communications, and the future mobile communication is bound to evolve toward higher frequency bands. Therefore, this has higher requirements for the volume of LTCC narrow-band filters. How to make the LTCC narrow-band filter reduce the length of the Z direction and reduce the volume of the filter under the condition of satisfying the filtering requirement is a problem to be solved at present.

Summary of the invention

In view of this, embodiments of the present invention are expected to provide a filter, a filtering method, and a storage medium, which can effectively reduce the height of the LTCC narrowband filter and reduce the LTCC narrowband filter. volume of.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

Embodiments of the present invention provide a filter, including: an input port, an output port, a shielding box, a medium, at least two layers of a half-wavelength resonance unit, at least one quarter-wavelength resonance unit, and at least three layers. Grounded resonance unit;

The half-wavelength resonance unit and the quarter-wavelength resonance unit are connected in parallel between the input port and the output port; the first layer half-wavelength resonance unit is connected to the input port at one end, and the other end is suspended, the last layer of the half-wavelength One end of the resonant unit is connected to the output port, and the other end is suspended;

The other half-wavelength resonance unit except the first layer and the last layer of the half-wavelength resonance unit are suspended at both ends, and one end of the quarter-wavelength resonance unit is grounded through the shielding box, and the other end is suspended;

The grounding resonating unit surrounds the half-wavelength resonating unit and the quarter-wavelength resonating unit, respectively, the grounding resonating unit is suspended inside, and the outside is grounded through the shielding box.

In the above solution, the input port is configured to input a broadband microwave signal; and the output port is configured to output a filtered microwave signal.

In the above solution, the half-wavelength resonance unit realizes parallel resonance by using a one-half wavelength open route, and is configured to receive a microwave signal output from the input port or the upper half-wavelength resonance unit or the upper-half-wavelength resonance unit. And inputting the filtered microwave signal to the next half-wavelength resonance unit or the next quarter-wavelength resonance unit or output port;

The quarter-wavelength resonance unit realizes parallel resonance by using a quarter-wave short-circuit line, configured to receive the microwave signal outputted by the upper half-wavelength resonance unit, and input the filtered microwave signal to the next layer and a half. Wavelength resonance unit.

In the above solution, the half-wavelength resonance unit and the quarter-wavelength resonance unit adopt a coupling manner to realize energy transmission between the layers.

In the above solution, the grounding resonating unit is configured to reduce the coupling strength between the half-wavelength resonant units and the quarter-wavelength resonant units of each layer.

In the above solution, the first layer grounding resonance unit surrounding the first layer half-wavelength resonance unit and the last layer grounding resonance unit surrounding the last layer half-wavelength resonance unit are suspended inside, the outer side is suspended, and the three sides are grounded through the shielding box;

The grounding resonating unit surrounding the non-first layer half-wavelength resonating unit and the last layer of the half-wavelength resonating unit is suspended inside, and the outer two sides are suspended, and the two sides are grounded through the shielding box;

The inner side of the ground resonating unit surrounding the quarter-wave resonant unit surrounds the quarter-wavelength resonating unit, and the inner side is suspended, and the outer two sides are grounded through the shielding box, and one side is suspended.

In the above solution, the half-wavelength resonance unit, the quarter-wave resonance unit, and the ground resonance unit are both stripline structures, and are embedded in the medium by a low temperature co-fired ceramic (LTCC) process.

In the above solution, the half-wavelength resonance unit and the quarter-wavelength resonance unit are arranged in a symmetrical structure.

In the above solution, the symmetric structure includes, but is not limited to, a V-shaped structure, a Z-shaped structure, and an N-shaped structure.

An embodiment of the present invention further provides a filtering method, where the method includes:

Receiving a broadband microwave signal input to the input port;

The received broadband microwave signal is filtered by at least two layers of a half-wavelength resonance unit, at least one quarter-wavelength resonance unit, and corresponding at least three layers of ground resonance units, and the filtered microwave signal is output to an output port;

The filtered microwave signal is output through the output port.

The embodiment of the invention further provides a computer storage medium storing a computer program for performing the filtering method of the embodiment of the invention.

The filter provided by the embodiment of the present invention includes: an input port, an output port, a shielding box, a medium, at least two layers of half-wavelength resonance units, at least one quarter-wavelength resonance unit, and at least three layers of grounded resonance units; , the half-wavelength resonance unit and the quarter-wave resonance single The element is connected in parallel between the input port and the output port; the input port is connected to the first layer half-wavelength resonance unit, and the output port is connected to the last layer half-wavelength resonance unit; the input port is configured to input a broadband microwave signal; The output port is configured to output a filtered microwave signal; the half-wavelength resonance unit is suspended at both ends, and one end of the quarter-wavelength resonance unit is grounded through a shielding box, and the other end is suspended; the half-wavelength resonance unit is configured as Receiving the microwave signal output from the input port or the upper half-wavelength resonance unit or the upper quarter-wavelength resonance unit, and inputting the filtered microwave signal to the next half-wavelength resonance unit or the next layer of quarters a wavelength resonance unit or an output port; the quarter-wave resonance unit is configured to receive a microwave signal output by the upper half-wavelength resonance unit, and input the filtered microwave signal to the next half-wavelength resonance unit; The grounding resonating unit surrounds the half-wavelength resonating unit and the quarter-wave resonating unit, respectively, the grounding resonating unit Floating side, the outer cartridge by the shield ground; configured to reduce the coupling strength between the layers is half-wavelength resonator and the quarter wave resonator unit cell. In this way, the height of the Z dimension of the filter can be effectively reduced, the volume of the filter can be reduced, and the loss in the pass band is low, the out-of-band suppression is high, the weight is light, the reliability is high, the electrical performance is excellent, and the electromagnetic interference resistance is obtained. Strong, no external electromagnetic interference, high temperature stability of electrical performance, simple circuit structure and so on.

DRAWINGS

1 is a schematic structural diagram of a filter according to an embodiment of the present invention;

2 is a schematic structural diagram of a filter according to Embodiment 2 of the present invention;

3 is a schematic structural diagram of a half-wavelength resonance unit and a grounding resonance unit according to an embodiment of the present invention;

4 is a schematic structural view of a quarter-wavelength resonance unit and a grounding resonance unit according to an embodiment of the present invention;

5 is a schematic structural diagram of an equivalent impedance of a filter according to an embodiment of the present invention;

6 is a schematic structural diagram of an equivalent capacitor and inductor of a filter according to an embodiment of the present invention;

7 is a schematic flowchart of a filtering method according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a three-dimensional full-wave simulation performance curve of a filter according to an embodiment of the present invention.

detailed description

In the embodiment of the present invention, the filter includes: an input port, an output port, a shielding box, a medium, at least two layers of half-wavelength resonance units, at least one quarter-wavelength resonance unit, and at least three layers of ground resonance units; Wherein the half-wavelength resonance unit and the quarter-wavelength resonance unit are connected in parallel between the input port and the output port; the first layer half-wavelength resonance unit is connected to the input port at one end, and the other end is suspended, the last layer One end of the half-wavelength resonant unit is connected to the output port, and the other end is suspended. The input port is configured to input a broadband microwave signal; the output port is configured to output a filtered microwave signal; and the first layer and the last layer are half-wavelength The remaining half-wavelength resonance units outside the resonance unit are suspended at both ends, one end of the quarter-wavelength resonance unit is grounded through the shielding box, and the other end is suspended; the half-wavelength resonance unit is configured to receive the input port or the upper half-wavelength a microwave signal output from the resonance unit or the upper quarter-wavelength resonance unit, and the filtered microwave signal is input to a half-wavelength resonance unit or a next-quarter quarter-wave resonance unit or an output port; the quarter-wavelength resonance unit is configured to receive a microwave signal output by the upper half-wavelength resonance unit and filter the signal The microwave signal is input to the next half-wavelength resonance unit; the grounded resonance unit surrounds the half-wavelength resonance unit and the quarter-wavelength resonance unit, respectively, the ground resonance unit is suspended inside, and the outside is grounded through the shielding box, and is configured In order to reduce the coupling strength between the half-wavelength resonant units and the quarter-wavelength resonant units of each layer.

The filter of the embodiment of the present invention is described in detail below with reference to the accompanying drawings and embodiments. FIG. 1 is a schematic structural diagram of a filter according to an embodiment of the present invention. As shown in FIG. 1 , the filter in the embodiment of the present invention includes: an input port. 11. An output port 12, a shield box 13, a medium 14, at least two layers of half-wavelength resonating units 15, at least one quarter-wavelength resonating unit 16, and at least three layers of ground resonating units 17;

The input port 11 is configured to input a broadband microwave signal; the output port 12 is configured to output a filtered microwave signal;

The half-wavelength resonance unit 15 is configured to receive the microwave signal output from the input port 11 or the upper half-wavelength resonance unit 15 or the quarter-wave resonance unit 16, and input the filtered microwave signal to the next half wavelength. Resonant unit 15 or quarter-wave resonance unit 16 or output port 12;

The quarter-wavelength resonance unit 16 is configured to receive the microwave signal output by the upper half-wavelength resonance unit 15, and input the filtered microwave signal to the next half-wavelength resonance unit 15;

The grounding resonating unit 17 is configured to reduce the coupling strength between the respective layers of the half-wavelength resonating unit 15 and the quarter-wave resonating unit 16.

The at least two layers of half-wavelength resonance unit 15, at least one quarter-wavelength resonance unit 16 is connected in parallel between the input port 11 and the output port 12;

One end of the first layer half-wavelength resonating unit 15 is connected to the input port 11 and the other end is suspended. The end of the last half-wavelength resonating unit 15 is connected to the output port 12, and the other end is suspended.

The remaining half-wavelength resonating unit 15 except the first layer and the last layer of the half-wavelength resonating unit are suspended at both ends, and the parallel resonance is realized by using a half-wavelength open path; the at least one quarter-wavelength resonance One end of the unit 16 is grounded through the shielding box 13, and the other end is suspended, and parallel resonance is realized by using a quarter-wave short-circuit line.

The at least two layers of the half-wavelength resonating unit 15 and the at least one quarter-wavelength resonating unit 16 are coupled to achieve energy transfer between the layers.

The at least three layers of grounded resonating units 17 surround the at least two layers of half-wavelength resonating units 15 and at least one quarter-wavelength resonating unit 16 respectively; wherein the first surrounding the first layer of half-wavelength resonating units 15 The layer grounding resonating unit 17 and the last layer of the grounding resonating unit 17 surrounding the last layer of the half-wavelength resonating unit 15 are suspended inside, the outer side is suspended, and the three sides are grounded through the shielding box; The ground resonating unit 17 surrounding the non-first layer half-wavelength resonating unit 15 and the last layer of the half-wavelength resonating unit 15 is suspended inside, and the outer two sides are suspended, and both sides are grounded through the shielding box; the surrounding quarter-wavelength resonating unit 16 The inner side of the grounding resonating unit 17 surrounds the quarter-wavelength resonating unit 16 on three sides, and the inner side is suspended, and the outer two sides are grounded through the shielding box, and one side is suspended.

The at least two layers of the half-wavelength resonating unit 15, the at least one quarter-wavelength resonating unit 16, and the at least three layers of the ground resonating unit 17 are each a stripline structure embedded in the low temperature co-fired ceramic (LTCC) process. In the medium.

The at least two layers of the half-wavelength resonating unit 15 and the at least one quarter-wavelength resonating unit 16 are arranged in a symmetrical structure; the symmetrical structure includes, but is not limited to, a V-shaped structure, a Z-shaped structure, and an N-type structure.

The filter structure of the embodiment of the present invention is described in detail below with reference to the filter structure. In this embodiment, the V-shaped structure is taken as an example, but is not limited thereto. FIG. 2 is a schematic structural diagram of a filter according to Embodiment 2 of the present invention. As shown in FIG. 2, the filter in the embodiment of the present invention comprises a 7-layer structure design: a 6-layer half-wavelength resonance unit, a 1-layer quarter-wave resonance unit, and a 7-layer grounded resonance unit; in an embodiment The filter structure of the second embodiment of the present invention includes:

Input port Port1, output port Port2, shield box Ground, medium Sub, first layer half-wavelength resonance unit R1, first layer ground resonance unit G1, second layer half-wavelength resonance unit R2, second layer ground resonance unit G2, Three-layer half-wavelength resonant unit R3, third-layer grounded resonant unit G3, fourth-layer quarter-wave resonant unit R4, fourth-layer grounded resonant unit G4, fifth-layer half-wavelength resonant unit R5, fifth-layer grounded resonance a unit G5, a sixth layer half wavelength resonance unit R6, a sixth layer ground resonance unit G6, a seventh layer half wavelength resonance unit R7 and a seventh layer ground resonance unit G7;

among them,

The first layer half-wavelength resonance unit R1, the second layer half-wavelength resonance unit R2, the third-layer half-wavelength resonance unit R3, and the fourth layer quarter wave are connected in parallel between the input port Port1 and the output port Port2. a long resonance unit R4, a fifth layer half wavelength resonance unit R5, a sixth layer half wavelength resonance unit R6, a seventh layer half wavelength resonance unit R7;

The first, second, third, fifth, sixth, and seventh layers of the half-wavelength resonant unit R1, R2, R3, R5, R6, and R7 are suspended at both ends, and the fourth layer of the quarter-wavelength resonant unit R4 is grounded through the shielding box Ground. The other end is suspended;

The first layer grounding resonating unit G1 surrounds the first layer half wavelength resonating unit R1, the second layer ground resonating unit G2 surrounds the second layer half wavelength resonating unit R2, and the third layer ground resonating unit G3 surrounds the third layer half wavelength resonating unit R3 The fourth layer grounding resonance unit G4 surrounds the fourth layer quarter wave resonance unit R4, the fifth layer ground resonance unit G5 surrounds the fifth layer half wavelength resonance unit R5, and the sixth layer ground resonance unit G6 surrounds the sixth layer and a half. The wavelength resonating unit R6 and the seventh layer grounding resonating unit G7 surround the seventh layer half-wavelength resonating unit R7 to weaken the coupling strength between the layers and reduce the filter volume.

The first and seventh grounding resonating units G7 and G8 surround the first and seventh layers of the half-wavelength resonating units R1 and R7, respectively, and the internal measurements are suspended, and the outer three sides are grounded to the left side, and the second, third, fifth and sixth layers are suspended. The inner side of the grounding resonating unit surrounds the second, third, fifth and sixth half-wavelength resonating units, the internal measurement is suspended, the outer two sides are grounded on both sides of the ground, and the inner side of the fourth layer of the grounding resonating unit surrounds the quarter-wave resonating unit. Hanging, the outer two sides are grounded to Ground, and one side is suspended;

3 is a schematic structural diagram of a half-wavelength resonance unit and a grounded resonance unit according to an embodiment of the present invention. As shown in FIG. 3, the grounded resonance unit surrounds the half-wavelength resonance unit, wherein λ is a resonance frequency of a half-wavelength resonator. The wavelength, d is the distance between the outside of the half-wavelength resonance unit and the inner side of the grounded resonance unit, and the w is the width of the strip line structure of the half-wavelength resonance unit; the values of d and w can be determined according to actual needs, such as Determined by experiment, the values of d and w in the most ideal case of outputting the microwave signal are selected as the final determined values of d and w.

4 is a schematic structural view of a quarter-wavelength resonance unit and a grounded resonance unit according to an embodiment of the present invention. As shown in FIG. 4, the inner side of the grounded resonance unit surrounds the quarter-wave resonance. a unit, wherein λ is a wavelength corresponding to a resonance frequency of the quarter-wave resonator, and d is a distance between an outer side of the quarter-wavelength resonance unit and an inner side of the ground resonance unit, wherein w is a quarter wavelength The width of the strip line structure of the resonant unit; the values of d and w can be determined according to actual needs, as determined by experiments, and the values of d and w in the most ideal case of outputting microwave signals are selected as the final of d and w. Determine the value.

The first layer half-wavelength resonance unit R1, the first layer ground resonance unit G1, the second layer half-wavelength resonance unit R2, the second layer ground resonance unit G2, the third-layer half-wavelength resonance unit R3, and the third layer ground resonance unit G3 , fourth layer quarter wave resonance unit R4, fourth layer ground resonance unit G4, fifth layer half wavelength resonance unit R5, fifth layer ground resonance unit G5, sixth layer half wavelength resonance unit R6, sixth layer The grounding resonance unit G6, the seventh layer half-wavelength resonance unit R7 and the seventh layer grounding resonance unit G7 are all realized by a low temperature co-fired ceramic LTCC process;

First half-wavelength resonance unit R1, second-layer half-wavelength resonance unit R2, third-layer half-wavelength resonance unit R3, fourth-layer quarter-wave resonance unit R4, fifth-layer half-wavelength resonance unit R5, sixth The layer half-wavelength resonance unit R6 and the seventh-layer half-wavelength resonance unit R7 all adopt parallel parameters to realize parallel resonance and realize energy transfer between layers by coupling;

The first layer half-wavelength resonance unit R1, the second layer half-wavelength resonance unit R2, the third-layer half-wavelength resonance unit R3, the fifth-layer half-wavelength resonance unit R5, the sixth-layer half-wavelength resonance unit R6, and the seventh layer half-wavelength The resonant unit R7 uses a one-half wavelength open path to achieve parallel resonance, and the fourth quarter quarter-wave resonant unit R4 uses a quarter-wave short-circuit line to achieve parallel resonance.

First half-wavelength resonance unit R1 and seventh layer half-wavelength resonance unit R7, first-layer ground resonance unit G1 and seventh-layer ground resonance unit G7, second-layer half-wavelength resonance unit R2 and sixth-layer half-wavelength resonance unit R6, second layer grounding resonating unit G2 and sixth layer grounding resonating unit G6, third layer half wavelength resonating unit R3 and fifth layer half wavelength resonating unit R5, third layer grounding resonating unit G3 and fifth layer grounding resonating unit G5 is symmetrically distributed up and down, as shown in Fig. 2, and may be other symmetrical structures such as Z-type and N-type.

5 is a schematic structural diagram of an equivalent impedance of a filter according to an embodiment of the present invention. As shown in FIG. 5, the equivalent impedance of the first layer half-wavelength resonant unit R1 and the first-layer grounded resonant unit G1 is Z ₀ and Z. _1. The equivalent impedance of the second half-wavelength resonant unit R2 and the second grounded resonant unit G2 is Z ₁ and Z ₂ , and the equivalent impedance of the third-layer half-wavelength resonant unit R3 and the third-layer grounded resonant unit G3 is Z ₂ and Z ₃ , the equivalent impedance of the fourth layer quarter wave resonance unit R4 and the fourth layer ground resonance unit G4 is Z ₃ , the fifth layer half wavelength resonance unit R5 and the fifth layer ground resonance unit G5 The equivalent impedance is Z ₃ and Z ₂ , the equivalent impedance of the sixth-layer half-wavelength resonance unit R6 and the sixth-layer ground resonance unit G6 is Z ₂ and Z ₁ , and the seventh-layer half-wavelength resonance unit R7 and the seventh layer are grounded. The equivalent impedance of the resonant unit G7 is Z ₁ and Z ₀ ;

FIG. 6 is a schematic structural diagram of a capacitor equivalent capacitor and inductor according to an embodiment of the present invention. As shown in FIG. 6, the first layer half-wavelength resonant unit R1 is equivalent to LC parallel resonance, wherein the equivalent inductance is L1, and the equivalent capacitance is C1; the second half-wavelength resonant unit R2 is equivalent to LC parallel resonance, wherein the equivalent inductance is L2 and the equivalent capacitance is C2; the third layer half-wavelength resonant unit R3 is equivalent to LC parallel resonance, wherein the equivalent inductance is L3, the equivalent capacitance is C3; the fourth layer quarter-wave resonance unit is equivalent to LC parallel resonance, wherein the equivalent inductance is L4, the equivalent capacitance is C4; the fifth layer half-wavelength resonance unit R5 is equivalent to LC Parallel resonance, where the equivalent inductance is L5 and the equivalent capacitance is C5; the sixth half-wavelength resonance unit R6 is equivalent to LC parallel resonance, wherein the equivalent inductance is L6, the equivalent capacitance is C6; the seventh layer half-wavelength resonance Unit R7 is equivalent to LC parallel resonance, where the equivalent inductance is L7 and the equivalent capacitance is C7;

The equivalent coupling inductance of the first half-wavelength resonance unit R1 and the second layer half-wavelength resonance unit R2 is L12, and the equivalent coupling capacitance is C12; the second-layer half-wavelength resonance unit R2 and the third-layer half-wavelength resonance unit R3 The equivalent coupling inductance is L23, the equivalent coupling capacitance is C23; the equivalent coupling inductance of the third layer half-wavelength resonance unit R3 and the fourth-layer quarter-wave resonance unit R4 is L34, and the equivalent coupling capacitance is C34; The equivalent coupling inductance of the four-layer quarter-wave resonance unit R4 and the fifth-layer half-wavelength resonance unit R5 is L45, and the equivalent coupling capacitance is C45; the fifth layer half-wavelength harmonic The equivalent coupling inductance of the vibration unit R5 and the sixth layer half-wavelength resonance unit R6 is L56, and the equivalent coupling capacitance is C56; the equivalent coupling inductance of the sixth-layer half-wavelength resonance unit R6 and the seventh-layer half-wavelength resonance unit R7 is L67, the equivalent coupling capacitance is C67;

The working process of the filter according to the embodiment of the present invention is shown in FIG. 7. FIG. 7 is a schematic flowchart of a filtering method according to an embodiment of the present invention. As shown in FIG. 7, the embodiment of the present invention is shown in FIG. The filtering method includes the following steps:

Step 701: Receive a broadband microwave signal input by the input port.

Step 702: Filter the received broadband microwave signal through at least two layers of a half-wavelength resonance unit, at least one quarter-wavelength resonance unit, and corresponding at least three layers of ground resonance units, and output the filtered microwave signal to an output. port;

Taking the filter structure shown in FIG. 2 as an example, when the input broadband microwave signal reaches the first layer half-wavelength resonance unit R1 via the input port Port1, only the first layer half-wavelength resonance unit is in the broadband microwave signal. The microwave signal near the resonant frequency of R1 can enter and resonate. At this time, the circuit exhibits low impedance and the signal can pass. The microwave signal near the resonant frequency of the non-first half-wavelength resonant unit R1 is distributed through the first half-wavelength resonant unit R1. The capacitor and the distributed inductor are grounded. At this time, the circuit exhibits high impedance and the signal cannot pass, achieving the first stage filtering;

The microwave signal after the first layer filtering is spatially coupled to the second layer half-wavelength resonance unit R2, and the microwave signal in the broadband microwave signal near the resonance frequency of the second layer half-wavelength resonance unit R2 enters to generate resonance, The circuit exhibits low impedance and the signal can pass. The microwave signal near the resonant frequency of the non-second half-wavelength resonant unit R2 is grounded through the distributed capacitance of the second half-wavelength resonant unit R2 and the distributed inductance. At this time, the circuit exhibits high impedance. , the signal can not pass, to achieve the second level of filtering;

The microwave signal after the second layer filtering is spatially coupled to the third layer half-wavelength resonance unit R3, and the microwave signal in the broadband microwave signal near the resonance frequency of the third-layer half-wavelength resonance unit R3 enters to generate resonance. When the circuit appears as low impedance, the signal can pass, non-third layer The microwave signal near the resonant frequency of the half-wavelength resonant unit R3 is grounded through the distributed capacitance of the third-layer half-wavelength resonant unit R3 and the distributed inductance. At this time, the circuit exhibits high impedance and the signal cannot pass, achieving third-stage filtering;

The microwave signal after the third layer filtering is spatially coupled to the fourth layer quarter-wavelength resonance unit R4, and the microwave in the wide-band microwave signal is near the resonance frequency of the fourth-layer quarter-wave resonance unit R4. The signal enters to generate resonance. At this time, the circuit exhibits low impedance, and the signal can pass. The microwave signal near the resonance frequency of the non-fourth quarter-wavelength resonance unit R4 passes through the fourth layer quarter-wave resonance unit R4 to distribute the capacitance and The distributed inductor is grounded. At this time, the circuit exhibits high impedance and the signal cannot pass, achieving fourth-stage filtering.

The microwave signal after the fourth layer filtering is spatially coupled to the fifth layer half-wavelength resonance unit R5, and the microwave signal in the broadband microwave signal near the resonance frequency of the fifth-layer half-wavelength resonance unit R5 enters to generate resonance. The circuit exhibits low impedance, and the signal can pass. The microwave signal near the resonant frequency of the non-fifth half-wavelength resonant unit R5 passes through the distributed capacitance of the fifth-layer half-wavelength resonant unit R5 and the distributed inductance is grounded. At this time, the circuit exhibits high impedance. The signal cannot pass, and the fifth stage filtering is implemented;

The microwave signal filtered by the fifth layer is spatially coupled to the sixth-layer half-wavelength resonance unit R6, and the microwave signal in the broadband microwave signal in the vicinity of the resonance frequency of the sixth-layer half-wavelength resonance unit R6 enters resonance. The circuit exhibits low impedance and the signal can pass. The microwave signal near the resonant frequency of the non-sixth half-wavelength resonant unit R6 passes through the sixth layer half-wavelength resonant unit R6 distributed capacitance and distributed inductance grounding, and the circuit exhibits high impedance. The signal cannot pass, and the sixth level filtering is implemented;

The microwave signal filtered by the sixth layer is spatially coupled to the seventh-layer half-wavelength resonance unit R7, and the microwave signal in the broadband microwave signal near the resonance frequency of the seventh-layer half-wavelength resonance unit R7 enters to generate resonance. When the circuit exhibits low impedance, the signal can pass, and the microwave signal near the resonant frequency of the non-seventh half-wavelength resonant unit R7 passes through the seventh-layer half-wavelength resonant unit. The R7 distributed capacitor and the distributed inductor are grounded. At this time, the circuit exhibits high impedance and the signal cannot pass, achieving seventh-stage filtering.

Step 703: Output the filtered microwave signal through the output port.

The last filtered microwave signal is output by the output port Port2, thereby implementing the microwave filtering function. At the same time, since the layers are symmetrically distributed up and down, the cross-coupling produces a zero point at the high end, which makes the filter have very good attenuation.

By comparing the conventional strip-shaped transmission line and the strip line in the filter according to the embodiment of the present invention, it is known that the capacitance between the strip-shaped line conductors is the same when the distances of the coupled transmission lines are the same and the distance between them is the same. In the embodiment, the distance between the strip line and the ground is greatly reduced compared to the conventional coupling strip line, and the capacitance formed between the strip line and the ground resonating unit surrounding the strip line is invented. The capacitance between the strip line and the ground in the filter is larger than that of the conventional strip line, and the strip line in the filter of the embodiment of the invention is the same when the distance between the layers is the same. The coupling coefficient is smaller. For the coupled line, the larger the coupling coefficient, the smaller the distance between the layers, and therefore, the same coupling strength is achieved, and the distance used by the strip line in the filter of the embodiment of the invention is greatly reduced, that is, reduced. The size in the Z dimension. After the grounding around the coupling line, the even mode capacitance does not change. Due to the capacitance between the ground and the surrounding ground, the odd mode capacitance will become larger and the characteristic impedance will become smaller. To ensure the characteristic of 50 ohms, the feasible way is to reduce the width of the coupling line. Thus, the capacitive coupling strength between the coupled lines is reduced, and in fact, the size in the Z direction can also be reduced.

FIG. 8 is a schematic diagram of a three-dimensional full-wave simulation performance curve of a filter according to an embodiment of the present invention. As shown in FIG. 8, the filter bandwidth is 32.4 GHz to 33.8 GHz, and the insertion loss of the simulation filter is 2.5 dB in the passband, and the return loss is excellent. At -13 dB, the two sidebands each produce a transmission zero point that makes the sideband attenuation very steep, the low rejection band rejection is better than -90 dB, and the high rejection band rejection is better than -70 dB, which has good filter performance.

The filter provided by the embodiment of the invention is realized by a low temperature co-fired ceramic material, and the metal pattern is sintered at a temperature of about 900 ° C, which has very high reliability, temperature stability and very Low mass production cost, the structure adopts three-dimensional integration and a new type of coupling line structural unit (the combination of a half-wavelength resonance unit and a quarter-wave resonance unit, surrounding the strip line), which reduces the size of the Z dimension, thereby The volume of the filter according to Embodiment 2 of the present invention can be reduced to 4 mm×1.6 mm×0.4 mm; and the layers are vertically symmetrical, and the cross-coupling generates a zero point at the high end, so that the filter has a very good attenuation. The filter of the embodiment of the invention also has the following significant advantages: low loss in the pass band, high out-of-band rejection, small volume, light weight, high reliability, excellent electrical performance, strong anti-electromagnetic interference capability, no external electromagnetic interference, The electrical performance has high temperature stability, simple circuit realization structure, good electrical performance consistency, and can realize mass production, and is particularly suitable for microwave band communication and radar systems which have strict requirements on volume, weight, performance and reliability.

The filter in the embodiment of the present invention is only exemplified by the foregoing embodiment, but is not limited thereto. It should be understood by those skilled in the art that the technical solutions described in the foregoing embodiments may be modified or partially Or all the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention;

E.g,

In the filter according to the embodiment of the present invention, the technical solution adopted is also applicable to other frequency bands in the microwave field, especially in the case where the low frequency spectrum of 450 MHz to 2.6 GHz is almost completely applied to the mobile communication field, and the future mobile communication It is bound to evolve toward higher frequency bands. Therefore, the design of the present invention can also be used as a miniaturized high-performance filter for a specific frequency band of a mobile terminal. When the applied microwave frequency bands are different, it is only necessary to change the strip length of the corresponding half-wavelength resonance unit strip line or the quarter-wave resonance unit.

In the embodiment of the present invention, the filter of FIG. 2 adopts a 7-layer three-dimensional design, and each layer has a V-shaped structure symmetry, which is only a compromise between filter insertion loss, volume size, filter attenuation and other performance indicators. Therefore, the filter according to the embodiment of the present invention is not limited to only FIG. The structure described in FIG. 2 may also be a zigzag symmetrical structure design or an N-type symmetrical structure design; the number of half-wavelength resonance units or the number of quarter-wavelength resonance units in the scheme may also vary according to filter performance indicators. Two quarter-wavelength resonance units are included in the zigzag symmetrical structure or the N-type symmetrical structure.

The invention relates to a miniaturized high-performance millimeter-band LTCC narrow-band filter, which uses a half-wavelength resonance unit in combination with a quarter-wavelength resonance unit, and is grounded around a strip-shaped transmission line, and any half of the same as the technical solution but adopted An LTCC filter having a different number of wavelength resonance units or a number of quarter-wavelength resonance units is within the protection scope of the present invention.

A miniaturized high-performance millimeter-band LTCC narrow-band filter according to an embodiment of the present invention uses wide-side coupling between resonant units, and is also suitable for LTCC wideband filter design. According to the bandwidth index of the LTCC filter, it is only necessary to change the coupling strength between the resonance units, which can be achieved by reducing the distance between the layers or weakening the coupling coefficient between the strip transmission line and the ground.

In the embodiment of the invention, a miniaturized high-performance millimeter-band LTCC narrow-band filter is implemented, and the volume size is determined by various factors such as operating frequency, dielectric constant, bandwidth, coupling strength between resonant units, and number of layers. Therefore, depending on the LTCC filter specifications to be designed, the implementation volume is different.

Correspondingly, the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a computer program, and the computer program is used to execute the filtering method of the embodiment of the present invention.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

A filter comprising: an input port, an output port, a shielding box, a medium, at least two layers of half-wavelength resonance units, at least one quarter-wavelength resonance unit, and at least three layers of grounded resonance units;

The half-wavelength resonance unit and the quarter-wavelength resonance unit are connected in parallel between the input port and the output port; the first layer half-wavelength resonance unit is connected to the input port at one end, and the other end is suspended, the last layer of the half-wavelength One end of the resonant unit is connected to the output port, and the other end is suspended;

The other half-wavelength resonance unit except the last half-wavelength resonance unit of the first layer is suspended at both ends, and one end of the quarter-wavelength resonance unit is grounded through the shielding box, and the other end is suspended;

The grounding resonating unit surrounds the half-wavelength resonating unit and the quarter-wavelength resonating unit, respectively, the grounding resonating unit is suspended inside, and the outside is grounded through the shielding box.
The filter of claim 1 wherein said input port is configured to input a broadband microwave signal; said output port is configured to output a filtered microwave signal.
The filter according to claim 1, wherein said half-wavelength resonance unit realizes parallel resonance by using a one-half wavelength open path, and is configured to receive an input port or an upper half-wavelength resonance unit or a quarter of an upper layer a microwave signal output by the wavelength resonating unit, and inputting the filtered microwave signal to a next half-wavelength resonance unit or a next-quarter quarter-wave resonance unit or an output port;

The quarter-wavelength resonance unit realizes parallel resonance by using a quarter-wave short-circuit line, configured to receive the microwave signal outputted by the upper half-wavelength resonance unit, and input the filtered microwave signal to the next layer and a half. Wavelength resonance unit.
The filter according to claim 1, wherein said half-wavelength resonance unit and quarter-wavelength resonance unit realize coupling of energy between layers.
The filter of claim 1 wherein said grounded resonating unit is configured to be lowered The coupling strength between each layer of the half-wavelength resonance unit and the quarter-wavelength resonance unit.
The filter according to claim 1 or 5, wherein said first layer grounding resonating unit surrounding said first half-wavelength resonating unit and said inner layer resonating unit surrounding said last layer of half-wavelength resonating unit are suspended inside, outside One side is suspended, and three sides are grounded through a shielding box;

The grounding resonating unit surrounding the non-first layer half-wavelength resonating unit and the last layer of the half-wavelength resonating unit is suspended inside, and the outer two sides are suspended, and the two sides are grounded through the shielding box;

The inner side of the ground resonating unit surrounding the quarter-wave resonant unit surrounds the quarter-wavelength resonating unit, and the inner side is suspended, and the outer two sides are grounded through the shielding box, and one side is suspended.
The filter according to claim 1, wherein said half-wavelength resonance unit, quarter-wave resonance unit, and ground resonance unit are stripline structures embedded in said medium by a low temperature co-fired ceramic (LTCC) process in.
The filter according to claim 1, wherein said half-wavelength resonance unit and quarter-wavelength resonance unit are arranged in a symmetrical structure.
The filter of claim 8 wherein said symmetric structure comprises, but is not limited to, a V-shaped structure, a Z-shaped structure, and an N-shaped structure.
A filtering method, the method comprising:

Receiving a broadband microwave signal input to the input port;

The received broadband microwave signal is filtered by at least two layers of a half-wavelength resonance unit, at least one quarter-wavelength resonance unit, and corresponding at least three layers of ground resonance units, and the filtered microwave signal is output to an output port;

The filtered microwave signal is output through the output port.
A computer storage medium having stored therein computer executable instructions for performing the filtering method of claim 10.