CN215266609U - Cross multimode band-pass filter - Google Patents
Cross multimode band-pass filter Download PDFInfo
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- CN215266609U CN215266609U CN202120823275.0U CN202120823275U CN215266609U CN 215266609 U CN215266609 U CN 215266609U CN 202120823275 U CN202120823275 U CN 202120823275U CN 215266609 U CN215266609 U CN 215266609U
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Abstract
A cross-shaped multimode band-pass filter comprises a dielectric substrate; the dielectric substrate comprises a metal grounding layer and a metal microstrip circuit layer which are oppositely attached to each other; the metal microstrip circuit layer comprises an input transmission line, an output transmission line and N groups of cross-shaped resonance units, wherein the numerical value of N is more than or equal to 1; the cross-shaped resonance unit comprises a first lambda/4 microstrip line resonator, a second lambda/4 microstrip line resonator, a first parallel open-circuit branch and a second parallel open-circuit branch; one ends of the first lambda/4 microstrip line resonator, the second lambda/4 microstrip line resonator, the first parallel open-circuit branch and the second parallel open-circuit branch are connected to form a cross structure, and the first lambda/4 microstrip line resonator and the second lambda/4 microstrip line resonator are in opposite positions; when the number of the cross-shaped resonance units is multiple, the cross-shaped resonance units are connected end to end in sequence. The utility model discloses improved miniaturized wave filter's outband rejection ability effectively, made the wholeness ability of wave filter more superior.
Description
Technical Field
The utility model relates to a multimode band pass filter, especially a filter of cross multimode band pass belongs to microwave communication technical field.
Background
With the development of technologies such as mobile communication, satellite communication, radar and the like, the market also puts forward requirements on the size of electronic equipment, wherein the requirements on the size of a filter are increasingly strict; the microwave filter is a device used for separating microwave signals with different frequencies, and mainly has the functions of inhibiting unwanted signals from passing through the filter and only allowing the wanted signals to pass through; with the development of communication technology, the research and development of high-performance miniaturized devices become the research and development direction in the microwave radio frequency field at present, and a filter is one of the core technologies in the microwave technology; the electromagnetic spectrum is limited, the application frequency band in the microwave radio frequency field is quite crowded at present, and the system puts higher requirements on the performance of the filter. In order to improve the spectral selectivity and spectral efficiency, two or more transmission zeros are required on either side of the filter passband. The out-of-band rejection of the filter directly influences the quality of the noise performance of a communication system, the bandwidth of the conventional filter is not wide enough, the structure is not stable enough, and the high end and the low end of the conventional filter cannot have better out-of-band rejection, so that the use of the filter is limited; there is therefore a need for a filter which ensures a small size and at the same time ensures a good out-of-band rejection.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a cross multimode band pass filter, it is not only can guarantee that the volume of wave filter is enough little, can also realize all having transmission zero at high low side stop band, the effectual outband rejection who improves miniaturized wave filter, makes the wholeness ability of wave filter more superior.
The problem is solved through following technical scheme:
a cross-shaped multimode band-pass filter comprises a dielectric substrate; the dielectric substrate comprises a metal grounding layer and a metal microstrip circuit layer which are oppositely attached to each other; the metal microstrip circuit layer comprises an input transmission line, an output transmission line and N groups of cross-shaped resonance units, wherein the numerical value of N is more than or equal to 1; the cross-shaped resonance unit comprises a first lambda/4 microstrip line resonator, a second lambda/4 microstrip line resonator, a first parallel open-circuit branch and a second parallel open-circuit branch; one ends of the first lambda/4 microstrip line resonator, the second lambda/4 microstrip line resonator, the first parallel open-circuit branch and the second parallel open-circuit branch are connected to form a cross structure, and the first lambda/4 microstrip line resonator and the second lambda/4 microstrip line resonator are in opposite positions; between adjacent cross-shaped resonance units, a second lambda/4 microstrip line resonator of the cross-shaped resonance unit close to an input transmission line and a first lambda/4 microstrip line resonator of another set of cross-shaped resonance units are close to and parallel to each other, the input transmission line inputs signals to the first lambda/4 microstrip line resonators of the first set of cross-shaped resonance units, and the second lambda/4 microstrip line resonator of the last set of cross-shaped resonance units outputs the signals from an output transmission line; the first lambda/4 microstrip line resonator and the second lambda/4 microstrip line resonator in each group of cross-shaped resonance units are not equal in length and width; the first parallel open-circuit branch and the second parallel open-circuit branch in each group of cross-shaped resonance units are unequal in length and width.
According to the cross-shaped multimode band-pass filter, the width of one branch with a longer length between the first parallel open-circuit branch and the second parallel open-circuit branch in the cross-shaped resonance unit is adjusted, so that the transmission zero point can be closer to the pass band of the filter.
In the cross-shaped multimode band-pass filter, the first parallel open-circuit branch and the second parallel open-circuit branch in each set of cross-shaped resonance units can be bent.
In the cross-shaped multimode band-pass filter, the dielectric substrate is made of a semiconductor material or an insulating material.
In the cross-shaped multimode band-pass filter, the working frequency band of the cross-shaped resonance unit is 2GHz-60 GHz.
The utility model discloses utilize the unequal-length branch of opening a way of not aequilate in each cross resonance unit of group to realize the adjustment at transmission zero point, through the width that changes the longer branch of opening a way of length in the cross resonance unit, just can be so that transmission zero point is close to the wave filter passband more, has improved the outband inhibition ability of wave filter effectively for the performance of wave filter is more superior.
Drawings
Fig. 1 is a schematic perspective view of two sets of cross resonant unit filters according to the present invention;
fig. 2 is a simulation curve diagram of two sets of cross resonant unit filters of the present invention;
fig. 3 is a simulation curve diagram of the three groups of cross resonant unit filters of the present invention.
The list of labels in the figure is: 1. a first lambda/4 microstrip line resonator. 2. The first parallel open-circuit branch, the second lambda/4 microstrip line resonator, 3, the first parallel open-circuit branch, 4, the second parallel open-circuit branch, 5, the dielectric substrate, 6, the input transmission line, and 7, the output transmission line.
Detailed Description
Referring to fig. 1, 2 and 3, the present invention includes a dielectric substrate 5; the dielectric substrate 5 comprises a metal grounding layer and a metal microstrip circuit layer which are oppositely attached; the metal microstrip circuit layer comprises an input transmission line 6, an output transmission line 7 and N groups of cross-shaped resonance units, wherein the numerical value of N is more than or equal to 1; the cross-shaped resonance unit comprises a first lambda/4 microstrip line resonator 1, a second lambda/4 microstrip line resonator 2, a first parallel open-circuit branch 3 and a second parallel open-circuit branch 4; one ends of the first lambda/4 microstrip line resonator 1, the second lambda/4 microstrip line resonator 2, the first parallel open-circuit branch 3 and the second parallel open-circuit branch 4 are connected to form a cross structure, and the first lambda/4 microstrip line resonator 1 and the second lambda/4 microstrip line resonator 2 are in opposite positions; between adjacent cross-shaped resonance units, the second lambda/4 microstrip line resonator 2 of the cross-shaped resonance unit close to the input transmission line 6 and the first lambda/4 microstrip line resonator 1 of another set of cross-shaped resonance units are close to and parallel to each other, the input transmission line 6 inputs signals to the first lambda/4 microstrip line resonator 1 of the first set of cross-shaped resonance units, and the second lambda/4 microstrip line resonator 2 of the last set of cross-shaped resonance units outputs signals from the output transmission line 7; n cross resonance units are sequentially connected end to form a 3N-order multimode band-pass filter, and two transmission zeros can be added when a pair of parallel open-circuit branches is added.
The first lambda/4 microstrip line resonator 1 and the second lambda/4 microstrip line resonator 2 in each group of cross-shaped resonance units are not equal in length and width; the first parallel open-circuit branch 3 and the second parallel open-circuit branch 4 in each group of cross-shaped resonance units are not equal in length and width; the transmission zero point can be made to be closer to the filter passband by adjusting the width of the branch with the longer length between the first parallel open-circuit branch 3 and the second parallel open-circuit branch 4 in the cross-shaped resonance unit; the out-of-band rejection capability of the filter is greatly improved.
The first parallel open-circuit branch 3 and the second parallel open-circuit branch 4 in each group of cross-shaped resonance units can be bent; the volume of the resonance unit is further reduced by the bending arrangement, and the space is saved.
The dielectric substrate 5 is made of a semiconductor material or an insulating material; the semiconductor material can be silicon chip, gallium arsenide and other materials, and the insulating material can be ceramic, Rogers substrate and other materials; the silicon, ceramic and other materials have good stability and good metal adhesion capability, and can reduce the influence of environmental factors on the frequency selection characteristic of the filter, thereby ensuring that the out-of-band rejection capability of the filter is not interfered.
The working frequency band of the cross-shaped resonance unit is 2GHz-60 GHz.
Example 1: two groups of cross-shaped resonance units are arranged
FIG. two is a simulation curve diagram of two groups of cross-shaped resonant unit filters, the abscissa is the signal frequency of the novel filter, and the ordinate is the amplitude; as can be seen from the second graph, the set of filters generates three transmission zeros distributed at 7.56GHz, 8.6GHz and 13.7GHz respectively, so that the performance of the filters is more excellent.
Example 2: three groups of cross-shaped resonance units are arranged
FIG. three is a simulation curve diagram of a three-group cross resonance unit filter, the abscissa is the signal frequency of the novel filter, and the ordinate is the amplitude; as can be seen from FIG. three, the set of filters generates four transmission zeros distributed at 17.5GHz, 18.8GHz, 19.5GHz and 26.3GHz, respectively; the performance of the filter is further improved.
Claims (5)
1. A cross-shaped multimode bandpass filter, characterized in that: comprises a dielectric substrate (5); the dielectric substrate (5) comprises a metal grounding layer and a metal micro-strip circuit layer which are oppositely attached to each other; the metal microstrip circuit layer comprises an input transmission line (6), an output transmission line (7) and N groups of cross-shaped resonance units, wherein the numerical value of N is more than or equal to 1; the cross-shaped resonance unit comprises a first lambda/4 microstrip line resonator (1), a second lambda/4 microstrip line resonator (2), a first parallel open-circuit branch (3) and a second parallel open-circuit branch (4); one ends of the first lambda/4 microstrip line resonator (1), the second lambda/4 microstrip line resonator (2), the first parallel open-circuit branch (3) and the second parallel open-circuit branch (4) are connected to form a cross structure, and the first lambda/4 microstrip line resonator (1) and the second lambda/4 microstrip line resonator (2) are in opposite positions; between adjacent cross-shaped resonance units, a second lambda/4 microstrip line resonator (2) of the cross-shaped resonance unit close to an input transmission line (6) and a first lambda/4 microstrip line resonator (1) of another set of cross-shaped resonance units are close to and parallel to each other, the input transmission line (6) inputs signals to the first lambda/4 microstrip line resonator (1) of the first set of cross-shaped resonance units, and the second lambda/4 microstrip line resonator (2) of the last set of cross-shaped resonance units outputs the signals from an output transmission line (7); the first lambda/4 microstrip line resonator (1) and the second lambda/4 microstrip line resonator (2) in each group of cross-shaped resonance units are unequal in length and width; the first parallel open-circuit branch (3) and the second parallel open-circuit branch (4) in each group of cross-shaped resonance units are not equal in length and width.
2. The cross-shaped multimode bandpass filter according to claim 1, characterized in that: the transmission zero point can be made to be closer to the filter passband by adjusting the width of the branch with the longer length between the first parallel open-circuit branch (3) and the second parallel open-circuit branch (4) in the cross-shaped resonance unit.
3. The cross-shaped multimode bandpass filter according to claim 2, characterized in that: the first parallel open-circuit branch (3) and the second parallel open-circuit branch (4) in each group of cross-shaped resonance units can be bent.
4. The cross-shaped multimode bandpass filter according to claim 3, characterized in that: the dielectric substrate (5) is made of a semiconductor material or an insulating material.
5. The cross-shaped multimode bandpass filter according to claim 4, characterized in that: the working frequency band of the cross-shaped resonance unit is 2GHz-60 GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120823275.0U CN215266609U (en) | 2021-04-21 | 2021-04-21 | Cross multimode band-pass filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120823275.0U CN215266609U (en) | 2021-04-21 | 2021-04-21 | Cross multimode band-pass filter |
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| Publication Number | Publication Date |
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| CN215266609U true CN215266609U (en) | 2021-12-21 |
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| CN202120823275.0U Active CN215266609U (en) | 2021-04-21 | 2021-04-21 | Cross multimode band-pass filter |
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2021
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