CN210006871U - wide stop band low-pass filter - Google Patents

wide stop band low-pass filter Download PDF

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CN210006871U
CN210006871U CN201921369883.8U CN201921369883U CN210006871U CN 210006871 U CN210006871 U CN 210006871U CN 201921369883 U CN201921369883 U CN 201921369883U CN 210006871 U CN210006871 U CN 210006871U
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蒋志强
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Chengdu Anpuli Electronics Co Ltd
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Abstract

The utility model discloses an kinds of wide stop band low pass filter passes through elliptic function filter structure, step impedance minor matters structure and stub trapped wave structure and realizes the suppression to high frequency signal, has realized that the passband insertion loss is less than 1.3dB, and the standing wave coefficient need be less than 1.8, and 4 ~ 10GHz outband suppression need be greater than 32dB, possess better standing wave coefficient, has successfully widened the stop band width, has reduced the size of wave filter to the cost of manufacture of wave filter has been reduced.

Description

wide stop band low-pass filter
Technical Field
The utility model belongs to the wireless communication field, concretely relates to kinds of wide stop band low pass filter.
Background
The filter is an indispensable passive devices in a communication system, the operation and performance of a microwave circuit in the communication system have a great relationship with the performance index of the filter, the frequency spectrum resources in the current wireless communication field are limited and precious, so that the frequency spectrum resources need to be fully utilized, sometimes frequency spectrums are shared, and the filter helps us to restrain unnecessary frequency band signals.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned not enough among the prior art, the utility model provides an kinds of wide stop band low pass filter have solved low pass filter's passband insertion loss and need be less than 1.5dB, and standing wave coefficient needs to be less than 2, and 4 ~ 10GHz outband restraines need be greater than 30 dB's problem.
In order to achieve the purpose, the utility model adopts the technical scheme that wide-stop-band low-pass filters comprise a square dielectric layer and a metal structure, wherein the metal structure is tightly attached to the surface of the square dielectric layer, and the metal structure comprises a microstrip line TL20, a microstrip line TL1, a microstrip line TL2, a microstrip line TL3, a microstrip line TL4, a microstrip line TL5, a microstrip line TL6, a microstrip line TL7, a microstrip line TL8, a microstrip line TL9, a microstrip line TL10, a microstrip line TL11, a microstrip line TL12, a microstrip line TL13, a microstrip line TL17, a microstrip line TL18, a microstrip line TL19, a microstrip line TL21, a T-type microstrip line Tee10, a T-type microstrip line TL5, a T-type microstrip line Tee6, a T-type Tee microstrip line 7, a T-type microstrip line Tee8 and a T-type microstrip line Tee9, wherein the end of the microstrip line TL20 is used as the input end of the wide-stop-band low-pass filter, the other TL 72 is connected with the other stopband 20, and the other transverse-stop-band Tee-stop-band 20 is connected with the microstrip line;
the microstrip line TL20, the microstrip line TL1, the T-shaped microstrip line Tee10, the microstrip line TL2, the T-shaped microstrip line Tee5, the microstrip line TL3, the T-shaped microstrip line Tee6, the microstrip line TL4, the T-shaped microstrip line Tee7, the microstrip line TL5, the T-shaped microstrip line Tee8, the microstrip line TL17, the T-shaped microstrip line Tee9 and the microstrip line TL21 are sequentially connected;
the transverse end of the T-shaped microstrip line Tee10 is respectively connected with a microstrip line TL1 and a microstrip line TL2, the longitudinal end of the T-shaped microstrip line Tee10 is connected with the end of the microstrip line TL6, and the other end of the microstrip line TL6 is connected with the microstrip line TL 10;
the transverse end of the T-shaped microstrip line Tee5 is respectively connected with a microstrip line TL2 and a microstrip line TL3, the longitudinal end of the T-shaped microstrip line Tee5 is connected with a end of the microstrip line TL7, and the other end of the microstrip line TL7 is connected with the microstrip line TL 11;
the transverse end of the T-shaped microstrip line Tee6 is respectively connected with a microstrip line TL3 and a microstrip line TL4, the longitudinal end of the T-shaped microstrip line Tee6 is connected with a end of the microstrip line TL8, and the other end of the microstrip line TL8 is connected with the microstrip line TL 12;
the transverse end of the T-shaped microstrip line Tee7 is respectively connected with a microstrip line TL4 and a microstrip line TL5, the longitudinal end of the T-shaped microstrip line Tee7 is connected with a end of the microstrip line TL9, and the other end of the microstrip line TL9 is connected with the microstrip line TL 13;
the transverse end of the T-shaped microstrip line Tee8 is respectively connected with a microstrip line TL5 and a microstrip line TL 17;
the longitudinal end of the T-shaped microstrip line Tee8 is connected with a microstrip line TL 19;
the transverse end of the T-shaped microstrip line Tee9 is respectively connected with a microstrip line TL17 and a microstrip line TL 21;
the longitudinal end of the T-shaped microstrip line Tee9 is connected with a microstrip line TL 18.
, the length of microstrip line TL20 is 2mm, and the width thereof is 0.24 mm.
, the length of the microstrip line TL1 is 0.32mm and the width of the microstrip line TL1 is 0.24mm, the length of the microstrip line TL2 is 2.41mm and the width of the microstrip line TL2 is 0.24mm, the length of the microstrip line TL3 is 4.55mm and the width of the microstrip line TL3 is 0.24mm, the length of the microstrip line TL4 is 3.95mm and the width of the microstrip line TL4 is 0.24mm, the length of the microstrip line TL5 is 0.47mm and the width of the microstrip line TL5 is 0.24mm, the length of the microstrip line TL17 is 8.47mm and the width of the microstrip line TL17 is 0.24mm, the length of the microstrip line TL6 is 6.53mm and the width of the microstrip line TL7 is 3.50mm and the width of the microstrip line TL7 is 0.24mm, the length of the microstrip line TL8 is 0.58mm and the width of the microstrip line 9 is 1.01mm and the width of the microstrip line 0.24.
, the length of microstrip line TL21 is 2mm, and the width thereof is 1.1 mm.
, the lengths of the T-shaped microstrip line Tee10, the T-shaped microstrip line Tee5, the T-shaped microstrip line Tee6, the T-shaped microstrip line Tee7, the T-shaped microstrip line Tee8 and the T-shaped microstrip line Tee9 are all 3.92mm, and the widths of the T-shaped microstrip line Tee9 and the T-shaped microstrip line Tee are all 0.24 mm.
steps include that the microstrip line TL10, the microstrip line TL11, the microstrip line TL12, the microstrip line TL13, the microstrip line TL19 and the microstrip line TL18 are microstrip open-circuit stub lines, the width of the microstrip line TL10 is 3.92mm, the length of the microstrip line TL10 is 0.54mm, the width of the microstrip line TL11 is 3.92mm, the length of the microstrip line TL11 is 1.59mm, the width of the microstrip line TL12 is 3.92mm, the length of the microstrip line TL13 is 2.08mm, the width of the microstrip line TL19 is 1.1mm, the length of the microstrip line TL12 is 4.80mm, and the width of the microstrip line TL18 is 1.1mm, and the length of the microstrip line TL18 is 4..
, the square dielectric layer adopts Rogers RO4350B high frequency plate with the thickness of 0.508 mm.
The step-in scheme has the advantages that the microstrip line TL20, the microstrip line TL1, the T-shaped microstrip line Tee10, the microstrip line TL2, the microstrip line TL6 and the microstrip line TL10 form a step impedance branch structure, the microstrip line TL2, the T-shaped microstrip line Tee5, the microstrip line TL3, the microstrip line TL7 and the microstrip line TL11 form a step impedance branch structure, the microstrip line TL3, the T-shaped microstrip line Tee6, the microstrip line TL4, the microstrip line TL8 and the microstrip line TL12 form a step impedance branch structure, the microstrip line TL4, the T-shaped microstrip line Tee7, the microstrip line TL5, the microstrip line TL 42 and the microstrip line TL13 form a step impedance branch structure, a resonance point of the step impedance branch structure is equivalent to a short circuit at a resonance frequency, so that the suppression capability of the filter in a rejection band is improved, the structure of the N-order elliptic function filter is equivalent to the parallel connection of the band pass filter 4-pass band structure, the stop band structure is improved in a transmission band, and the pass band stop band pass.
Microstrip line TL5, T-shaped microstrip line Tee8, microstrip line TL17 and microstrip line TL19 form a stub notch structure, and microstrip line TL17, T-shaped microstrip line Tee9, microstrip line TL21 and microstrip line TL18 form a stub notch structure; the filter adopts a structure that two sections of open stub are connected with the notch structure in parallel, so that the stop band of the filter is widened, and the standing wave coefficient of the filter can be adjusted by adjusting the length of a transmission line between the two sections of stubs, so that the best performance is achieved.
The utility model has the advantages that: the utility model discloses an ellipse function filter structure, step impedance minor matters structure and stub trapped wave structure realize being less than 1.3dB to the suppression of high frequency signal, have realized that the passband insertion loss is less than, and the standing wave coefficient need be less than 1.8, and 4 ~ 10GHz outband suppression need be greater than 32dB, possess better standing wave coefficient, have successfully widened the stop band width, have reduced the size of wave filter to the cost of manufacture of wave filter has been reduced.
Drawings
Fig. 1 is a schematic structural diagram of kinds of wide stop-band low-pass filters.
Fig. 2 shows an elliptic function low-pass filter of kinds of wide stop-band low-pass filters.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes will be apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and is intended to be protected by the present invention.
As shown in fig. 1, wide-stop-band low-pass filters include a square dielectric layer and a metal structure, wherein the metal structure is tightly attached to the surface of the square dielectric layer, and the metal structure includes a microstrip line TL20, a microstrip line TL1, a microstrip line TL2, a microstrip line TL3, a microstrip line TL4, a microstrip line TL5, a microstrip line TL6, a microstrip line TL7, a microstrip line TL8, a microstrip line TL9, a microstrip line TL10, a microstrip line TL11, a microstrip line TL12, a microstrip line TL13, a microstrip line TL17, a microstrip line TL18, a microstrip line TL19, a microstrip line TL21, a T-type microstrip line Tee10, a T-type microstrip line Tee5, a T-type Tee6, a T-type microstrip line Tee7, a T-type Tee8 and a T-type Tee9, a end of the microstrip line TL20 serves as an input end of the wide-stop-band low-pass filter, an other 20 end of the microstrip line 20 is connected with the microstrip line 20, and an output end of the microstrip line 20 and a transverse-stop-band low;
the microstrip line TL20, the microstrip line TL1, the T-shaped microstrip line Tee10, the microstrip line TL2, the T-shaped microstrip line Tee5, the microstrip line TL3, the T-shaped microstrip line Tee6, the microstrip line TL4, the T-shaped microstrip line Tee7, the microstrip line TL5, the T-shaped microstrip line Tee8, the microstrip line TL17, the T-shaped microstrip line Tee9 and the microstrip line TL21 are sequentially connected;
the transverse end of the T-shaped microstrip line Tee10 is respectively connected with a microstrip line TL1 and a microstrip line TL2, the longitudinal end of the T-shaped microstrip line Tee10 is connected with the end of the microstrip line TL6, and the other end of the microstrip line TL6 is connected with the microstrip line TL 10;
the transverse end of the T-shaped microstrip line Tee5 is respectively connected with a microstrip line TL2 and a microstrip line TL3, the longitudinal end of the T-shaped microstrip line Tee5 is connected with a end of the microstrip line TL7, and the other end of the microstrip line TL7 is connected with the microstrip line TL 11;
the transverse end of the T-shaped microstrip line Tee6 is respectively connected with a microstrip line TL3 and a microstrip line TL4, the longitudinal end of the T-shaped microstrip line Tee6 is connected with a end of the microstrip line TL8, and the other end of the microstrip line TL8 is connected with the microstrip line TL 12;
the transverse end of the T-shaped microstrip line Tee7 is respectively connected with a microstrip line TL4 and a microstrip line TL5, the longitudinal end of the T-shaped microstrip line Tee7 is connected with a end of the microstrip line TL9, and the other end of the microstrip line TL9 is connected with the microstrip line TL 13;
the transverse end of the T-shaped microstrip line Tee8 is respectively connected with a microstrip line TL5 and a microstrip line TL 17;
the longitudinal end of the T-shaped microstrip line Tee8 is connected with a microstrip line TL 19;
the transverse end of the T-shaped microstrip line Tee9 is respectively connected with a microstrip line TL17 and a microstrip line TL 21;
the longitudinal end of the T-shaped microstrip line Tee9 is connected with a microstrip line TL 18.
The microstrip line TL20 has a length of 2mm and a width of 0.24 mm.
The length of the microstrip line TL1 is 0.32mm, and the width thereof is 0.24 mm; the length of the microstrip line TL2 is 2.41mm, and the width of the microstrip line TL2 is 0.24 mm; the length of the microstrip line TL3 is 4.55mm, and the width of the microstrip line TL3 is 0.24 mm; the length of the microstrip line TL4 is 3.95mm, and the width of the microstrip line TL4 is 0.24 mm; the length of the microstrip line TL5 is 0.47mm, and the width of the microstrip line TL5 is 0.24 mm; the length of the microstrip line TL17 is 8.47mm, and the width of the microstrip line TL17 is 0.24 mm; the length of the microstrip line TL6 is 6.53mm, and the width of the microstrip line TL6 is 0.24 mm; the length of the microstrip line TL7 is 3.50mm, and the width of the microstrip line TL7 is 0.24 mm; the length of the microstrip line TL8 is 0.58mm, and the width of the microstrip line TL8 is 0.24 mm; the length of the microstrip line TL9 is 1.01mm, and the width thereof is 0.24 mm.
The microstrip line TL21 has a length of 2mm and a width of 1.1 mm.
The lengths of the T-shaped microstrip line Tee10, the T-shaped microstrip line Tee5, the T-shaped microstrip line Tee6, the T-shaped microstrip line Tee7, the T-shaped microstrip line Tee8 and the T-shaped microstrip line Tee9 are all 3.92mm, and the widths of the T-shaped microstrip line Tee10, the T-shaped microstrip line Tee5, the T-shaped microstrip line Tee6 and the T.
Microstrip lines TL10, TL11, TL12, TL13, TL19 and TL18 are all microstrip open-circuit stubs; the width of the microstrip line TL10 is 3.92mm, and the length of the microstrip line TL10 is 0.54 mm; the width of the microstrip line TL11 is 3.92mm, and the length of the microstrip line TL11 is 1.59 mm; the microstrip line TL12 is 3.92mm in width and 3.19mm in length; the width of the microstrip line TL13 is 3.92mm, and the length of the microstrip line TL13 is 2.08 mm; the width of the microstrip line TL19 is 1.1mm, and the length of the microstrip line TL19 is 4.80 mm; the microstrip line TL18 is 1.1mm wide and 4.50mm long.
The square dielectric layer adopts a Rogers RO4350B high-frequency plate, and the thickness of the square dielectric layer is 0.508 mm.
The utility model discloses a Rogers RO4350B high-frequency board as the dielectric plate, its equivalent dielectric constant epsilonrIs 3.66, and the thickness h is 0.508mm, the utility model discloses a three kinds of characteristic impedance Z0The widths W of the microstrip lines are respectively obtained by calculating according to the following formulas: 0.24mm, 3.92mm and 1.1 mm:
Figure BDA0002175197100000071
Figure BDA0002175197100000072
Figure BDA0002175197100000073
the utility model discloses an elliptic function filter model at first finds the required elliptic function low pass filter according to the design requirement to go back to changes, calculate inductance L and electric capacity C's of each rank value, the utility model discloses a nine rank model, as shown in FIG. 2, with each rank inductance, electric capacity microstrip ization, the utility model discloses a high low impedance line equivalence method changes it into microstrip filter, uses the 100 ohm high impedance line equivalence in the text for the series inductance in the wave filter, low impedance line equivalent parallel capacitance calculate the length of each section microstrip line from this.
Length of high impedance line: 1 ≈ f λghL/Z0；
Low impedance line length: 1 ≈ f λgcCZ0；
In the formula ofgh，λgcRespectively, the medium wavelength in the high and low impedance lines, and f the frequency.
In order to increase the rejection and width of the stop band, a notch structure of two sections of short stubs is added after the elliptic function low-pass filter structure, the short stubs use microstrip lines with the characteristic impedance of 50 omega, so the width of the short stubs is 1.1mm, and the length of the short stubs is quarter of the signal wavelength of the frequency to be rejected.
Stub length: 1/4 λ.
The microstrip line TL20, the microstrip line TL1, the T-shaped microstrip line Tee10, the microstrip line TL2, the microstrip line TL6 and the microstrip line TL10 form a step impedance stub structure, the microstrip line TL2, the T-shaped microstrip line Tee5, the microstrip line TL3, the microstrip line TL7 and the microstrip line TL11 form a step impedance stub structure, the microstrip line TL3, the T-shaped microstrip line Tee6, the microstrip line TL4, the microstrip line TL8 and the microstrip line TL12 form a step impedance stub structure, the microstrip line TL4, the T-shaped microstrip line Tee7, the microstrip line TL5, the microstrip line TL9 and the microstrip line TL13 form a step impedance stub structure, a resonance point of the step impedance stub structure is equivalent to a short circuit at a resonance frequency, so that the suppression capability of the filter in a stop band is improved, the N-order elliptic function filter structure is equivalent to the parallel connection of N impedance stubs, the three kinds of elliptic function filter structures with the same pass band number, the passband order function structure is equivalent to the -pass band-pass filter structure, the stop band-pass filter structure is introduced in a mode of a transmission zero band, the stop band-band, the stopband-pass band-pass filter structure is increased, the suppression function filter with the same degree of the same degree and the most order elliptic function, the basic elliptic function is a narrow band-pass band.
Microstrip line TL5, T-shaped microstrip line Tee8, microstrip line TL17 and microstrip line TL19 form a stub notch structure, and microstrip line TL17, T-shaped microstrip line Tee9, microstrip line TL21 and microstrip line TL18 form a stub notch structure; the filter adopts a structure that two sections of open stub are connected with the notch structure in parallel, so that the stop band of the filter is widened, and the standing wave coefficient of the filter can be adjusted by adjusting the length of a transmission line between the two sections of stubs, so that the best performance is achieved.
The utility model has the advantages that: the utility model discloses an ellipse function filter structure, step impedance minor matters structure and stub trapped wave structure realize being less than 1.3dB to the suppression of high frequency signal, have realized that the passband insertion loss is less than, and the standing wave coefficient need be less than 1.8, and 4 ~ 10GHz outband suppression need be greater than 32dB, possess better standing wave coefficient, have successfully widened the stop band width, have reduced the size of wave filter to the cost of manufacture of wave filter has been reduced.

Claims (7)

  1. The wide-stopband low-pass filter is characterized by comprising a square dielectric layer and a metal structure, wherein the metal structure is tightly attached to the surface of the square dielectric layer and comprises a microstrip line TL, a microstrip line T, a microstrip line Tee and a microstrip line Tee;
    the microstrip line TL20, the microstrip line TL1, the T-shaped microstrip line Tee10, the microstrip line TL2, the T-shaped microstrip line Tee5, the microstrip line TL3, the T-shaped microstrip line Tee6, the microstrip line TL4, the T-shaped microstrip line Tee7, the microstrip line TL5, the T-shaped microstrip line Tee8, the microstrip line TL17, the T-shaped microstrip line Tee9 and the microstrip line TL21 are sequentially connected;
    the transverse end of the T-shaped microstrip line Tee10 is respectively connected with a microstrip line TL1 and a microstrip line TL2, the longitudinal end of the T-shaped microstrip line Tee10 is connected with the end of the microstrip line TL6, and the other end of the microstrip line TL6 is connected with the microstrip line TL 10;
    the transverse end of the T-shaped microstrip line Tee5 is respectively connected with a microstrip line TL2 and a microstrip line TL3, the longitudinal end of the T-shaped microstrip line Tee5 is connected with a end of the microstrip line TL7, and the other end of the microstrip line TL7 is connected with the microstrip line TL 11;
    the transverse end of the T-shaped microstrip line Tee6 is respectively connected with a microstrip line TL3 and a microstrip line TL4, the longitudinal end of the T-shaped microstrip line Tee6 is connected with a end of the microstrip line TL8, and the other end of the microstrip line TL8 is connected with the microstrip line TL 12;
    the transverse end of the T-shaped microstrip line Tee7 is respectively connected with a microstrip line TL4 and a microstrip line TL5, the longitudinal end of the T-shaped microstrip line Tee7 is connected with a end of the microstrip line TL9, and the other end of the microstrip line TL9 is connected with the microstrip line TL 13;
    the transverse end of the T-shaped microstrip line Tee8 is respectively connected with a microstrip line TL5 and a microstrip line TL 17;
    the longitudinal end of the T-shaped microstrip line Tee8 is connected with a microstrip line TL 19;
    the transverse end of the T-shaped microstrip line Tee9 is respectively connected with a microstrip line TL17 and a microstrip line TL 21;
    the longitudinal end of the T-shaped microstrip line Tee9 is connected with a microstrip line TL 18.
  2. 2. The wide stop band low pass filter of claim 1, wherein the microstrip line TL20 has a length of 2mm and a width of 0.24 mm.
  3. 3. The wide-stopband low-pass filter of claim 1, wherein the microstrip line TL1 has a length of 0.32mm and a width of 0.24 mm; the length of the microstrip line TL2 is 2.41mm, and the width of the microstrip line TL2 is 0.24 mm; the length of the microstrip line TL3 is 4.55mm, and the width of the microstrip line TL3 is 0.24 mm; the length of the microstrip line TL4 is 3.95mm, and the width of the microstrip line TL4 is 0.24 mm; the length of the microstrip line TL5 is 0.47mm, and the width of the microstrip line TL5 is 0.24 mm; the length of the microstrip line TL17 is 8.47mm, and the width of the microstrip line TL17 is 0.24 mm; the length of the microstrip line TL6 is 6.53mm, and the width of the microstrip line TL6 is 0.24 mm; the length of the microstrip line TL7 is 3.50mm, and the width of the microstrip line TL7 is 0.24 mm; the length of the microstrip line TL8 is 0.58mm, and the width of the microstrip line TL8 is 0.24 mm; the length of the microstrip line TL9 is 1.01mm, and the width thereof is 0.24 mm.
  4. 4. The wide stop band low pass filter of claim 1, wherein the microstrip line TL21 has a length of 2mm and a width of 1.1 mm.
  5. 5. The wide-stopband low-pass filter according to claim 1, wherein the T-type microstrip line Tee10, the T-type microstrip line Tee5, the T-type microstrip line Tee6, the T-type microstrip line Tee7, the T-type microstrip line Tee8 and the T-type microstrip line Tee9 are all 3.92mm in length and 0.24mm in width.
  6. 6. The wide-stopband low-pass filter according to claim 1, wherein the microstrip line TL10, the microstrip line TL11, the microstrip line TL12, the microstrip line TL13, the microstrip line TL19 and the microstrip line TL18 are all microstrip open-stub lines; the width of the microstrip line TL10 is 3.92mm, and the length of the microstrip line TL10 is 0.54 mm; the width of the microstrip line TL11 is 3.92mm, and the length of the microstrip line TL11 is 1.59 mm; the microstrip line TL12 is 3.92mm in width and 3.19mm in length; the width of the microstrip line TL13 is 3.92mm, and the length of the microstrip line TL13 is 2.08 mm; the width of the microstrip line TL19 is 1.1mm, and the length of the microstrip line TL19 is 4.80 mm; the microstrip line TL18 is 1.1mm wide and 4.50mm long.
  7. 7. The wide stopband low-pass filter of claim 1, wherein the square dielectric layer is a RogersRO4350B high-frequency plate with a thickness of 0.508 mm.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111740190A (en) * 2020-07-28 2020-10-02 吉林大学 Broadband band-stop filter based on transmission line parallel multi-section open circuit stub line and design method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111740190A (en) * 2020-07-28 2020-10-02 吉林大学 Broadband band-stop filter based on transmission line parallel multi-section open circuit stub line and design method thereof

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