CN107681236B - Filter device with wide stop band suppression - Google Patents
Filter device with wide stop band suppression Download PDFInfo
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- CN107681236B CN107681236B CN201710947082.4A CN201710947082A CN107681236B CN 107681236 B CN107681236 B CN 107681236B CN 201710947082 A CN201710947082 A CN 201710947082A CN 107681236 B CN107681236 B CN 107681236B
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Abstract
The invention belongs to the technical field of signal filtering and provides a filtering device with wide stop band suppression. Therefore, the symmetrical low-pass filters are added at the input end and the output end of the band-pass filter to realize the suppression of high-order harmonics with wide stop band, and meanwhile, the size of the filtering device is reduced through reasonable arrangement on the wiring; meanwhile, the filtering device is manufactured by adopting an LTCC process, an integrated monolithic structure is formed, and the reliability is high, so that the problems that the size of the filtering device is large and the reliability is low in the existing signal filtering technology are solved.
Description
Technical Field
The invention belongs to the technical field of signal filtering, and particularly relates to a filtering device with wide stop band suppression.
Background
The band-pass filter is an important passive device in a microwave circuit, and has the main functions of filtering high-frequency signals and low-frequency signals and extracting frequency signals in the middle. Modern microwave communication systems require that the bandpass filter not only has good in-band performance, i.e. can suppress near-band clutter, but also can suppress far-band high-order harmonics, i.e. has a wide enough stop band. Generally, a bandpass filter generates a parasitic passband at a harmonic of the center frequency of the passband, which is a relatively large interference source for a transmitter and a receiver with high sensitivity. In addition, as electronic systems continue to be miniaturized, lightweight, and highly reliable, higher requirements are placed on the size and reliability of devices. The traditional band-pass filtering device is generally large in size and low in reliability, and the requirements of miniaturization and high reliability of an electronic system cannot be met.
The application publication number is CN104091980A, the name is a band-pass filter with wide stop band suppression, the technical scheme is that a quarter-wavelength short circuit line is adopted to realize a microstrip band-pass filter with a uniform impedance resonator, and the microstrip band-pass filter has the defects of large volume and low reliability.
In addition, the license notice number is CN201204240Y, the name is an integrated band-pass filter and low-pass filter component, the technical scheme is that the integrated band-pass filter and low-pass filter component consists of a band-pass filter and two low-pass filters, the band-pass filter and the low-pass filter are coaxial filters, and the cut-off frequencies of the two low-pass filters are different. The band-pass filter is an assembled filter and has the defects of large volume and low reliability.
Therefore, the existing signal filtering technology has the problems of large size and low reliability of a filtering device.
Disclosure of Invention
The invention aims to provide a filtering device with wide stop band suppression, and aims to solve the problems of large size and low reliability of the filtering device in the conventional signal filtering technology.
The invention provides a filtering device for wide stop band suppression, which comprises an input end, an output end, a band-pass filter and two low-pass filters, wherein the input end is connected with the output end of the filtering device;
two low pass filter for the band pass filter symmetry sets up, one low pass filter connects the input with between the band pass filter, another low pass filter connects the output with between the band pass filter, band pass filter and two low pass filter encapsulates in the ceramic matrix and forms the monolithic structure of integration.
In summary, in the filtering apparatus with wide stopband suppression, the filtering apparatus is formed by packaging a band-pass filter and two symmetrically arranged low-pass filters in a ceramic substrate to form an integrated monolithic structure, and the band-pass filter is located in the middle. Therefore, the symmetrical low-pass filters are added at the input end and the output end of the band-pass filter to realize the suppression of high-order harmonics with wide stop band, and meanwhile, the size of the filtering device is reduced through reasonable arrangement on the wiring; meanwhile, the filtering device is manufactured by adopting an LTCC process, an integrated monolithic structure is formed, and the reliability is high, so that the problems that the size of the filtering device is large and the reliability is low in the existing signal filtering technology are solved.
Drawings
Fig. 1 is a schematic connection structure diagram of a filtering apparatus with wide stop band suppression according to the present invention.
Fig. 2 is a circuit diagram illustrating an exemplary filtering apparatus with wide stop band rejection according to the present invention.
Fig. 3 is a schematic perspective view of a filter device with wide stop band suppression according to the present invention.
Fig. 4 is a schematic cross-sectional structure diagram of a filtering apparatus with wide stop band suppression according to the present invention.
Fig. 5 is a schematic diagram of insertion loss and return loss curves of the filtering apparatus with wide stop band suppression according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
According to the filtering device with the wide stop band suppression, the filtering device is formed in an integrated monolithic structure by packaging one band-pass filter and two symmetrically arranged low-pass filters in a ceramic matrix, and the band-pass filter is located in the middle. Therefore, the symmetrical low-pass filters are added at the input end and the output end of the band-pass filter to realize the suppression of high-order harmonics with wide stop band, and meanwhile, the size of the filter device is reduced through reasonable arrangement on the wiring; meanwhile, the filtering device is manufactured by adopting an LTCC process to form an integrated monolithic structure, and has higher reliability. The filtering device can be applied to harmonic suppressors, transmitters/receivers, digital-to-analog converters in DC-DC modules and the like, or applied to the fields of microwave communication, radar navigation, satellite communication, automotive electronics, electronic countermeasure and the like.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 shows the connection structure of the filtering apparatus with wide stop band rejection provided by the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and the details are as follows:
the filtering device for suppressing the wide stop band comprises an input end, an output end, a band-pass filter 102, a first low-pass filter 101 and a second low-pass filter 103;
first low pass filter 101 and second low pass filter 103 set up for band pass filter 102 symmetry, and first low pass filter 101 is connected between input and band pass filter 102, and second low pass filter 103 is connected between output and band pass filter 102, band pass filter 102 and above-mentioned two low pass filters encapsulate in the ceramic matrix and form the monolithic structure.
Fig. 2 shows an exemplary circuit of the filtering apparatus with wide stop band rejection provided by the present invention, and for convenience of illustration, only the parts related to the embodiment of the present invention are shown, and the details are as follows:
as an embodiment of the present invention, the band-pass filter 102 includes four resonant units connected in parallel, which are a first resonant unit, a second resonant unit, a third resonant unit, and a fourth resonant unit;
the first resonance unit is inductively coupled with the second resonance unit, the second resonance unit is connected with the third resonance unit through a capacitor, and the third resonance unit is inductively coupled with the fourth resonance unit.
As an embodiment of the present invention, the first resonant unit includes a first inductor L1 and a first capacitor C1, a first end of the first inductor L1 is connected to a first end of the first capacitor C1, and a second end of the first inductor L1 and a second end of the first capacitor C1 are grounded;
the second resonant unit comprises a second inductor L2 and a second capacitor C2, a first end of the second inductor L2 is connected with a first end of the second capacitor C2, and a second end of the second inductor L2 and a second end of the second capacitor C2 are grounded;
the third resonant unit comprises a third inductor L3 and a third capacitor C3, wherein the first end of the third inductor L3 is connected with the first end of the third capacitor C3, and the second end of the third inductor L3 and the second end of the third capacitor C3 are grounded;
the fourth resonant unit includes a fourth inductor L4 and a fourth capacitor C4, a first end of the fourth inductor L4 is connected to a first end of the fourth capacitor C4, and a second end of the fourth inductor L4 and a second end of the fourth capacitor C4 are grounded.
As an embodiment of the present invention, the first low-pass filter 101 includes a fifth inductor L5, a sixth inductor L6, and a fifth capacitor C5;
a first terminal of the fifth inductor L5 is an input terminal of the first low-pass filter 101, a second terminal of the fifth inductor L5 is commonly connected to a first terminal of the sixth inductor L6 and a first terminal of the fifth capacitor C5, a second terminal of the sixth inductor L6 is an output terminal of the first low-pass filter 101, and a second terminal of the fifth capacitor C5 is grounded.
As an embodiment of the present invention, the second low-pass filter 103 includes a seventh inductor L7, an eighth inductor L8, and a sixth capacitor C6;
a first terminal of the seventh inductor L7 is an input terminal of the second low-pass filter 103, a second terminal of the seventh inductor L7 is commonly connected to a first terminal of the eighth inductor L8 and a first terminal of the sixth capacitor C6, a second terminal of the eighth inductor L8 is an output terminal of the second low-pass filter 103, and a second terminal of the sixth capacitor C6 is grounded.
Fig. 3 and fig. 4 respectively show a three-dimensional structure and a cross-sectional structure of the filtering apparatus with wide stop band rejection provided by the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as an embodiment of the present invention, the first inductor L1 and the first capacitor C1, the second inductor L2 and the second capacitor C2, the third inductor L3 and the third capacitor C3, and the fourth inductor L4 and the fourth capacitor C4 are all connected through a through-hole cylinder.
As an embodiment of the present invention, the first inductor L1, the second inductor L2, the third inductor L3, and the fourth inductor L4 are disposed in a predetermined area, and the first capacitor C1, the fourth capacitor C4, the second capacitor C2, and the third capacitor C3 are respectively disposed on two sides of the predetermined area.
As an embodiment of the present invention, the first capacitor C1 and the fourth capacitor C4 have a first plate O1 opposite to the direction of the predetermined region, the second capacitor C2 and the third capacitor C3 have a second plate O2 opposite to the direction of the predetermined region, and the first plate O1 and the second plate O2 are used for shielding signals. The frequency of the resonant stage is determined by the sizes of the first inductor L1, the second inductor L2, the third inductor L3, the fourth inductor L4, the first capacitor C1, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4, and the center frequency can be changed by adjusting the thickness of the inductor-capacitor dielectric layer.
As an embodiment of the present invention, the inductance values of the fifth inductor L5 and the sixth inductor L6 are the same, and the fifth inductor L5 and the sixth inductor L6 are connected to the fifth capacitor C5 through a vertical cylinder. The fifth inductor L5 and the sixth inductor L6 are disposed in parallel in the width direction, thereby reducing the dimension in the length direction.
As an embodiment of the present invention, the inductance values of the seventh inductor L7 and the eighth inductor L8 are the same, and the seventh inductor L7 and the eighth inductor L8 are connected to the sixth capacitor C6 through a vertical cylinder. The seventh inductor L7 and the eighth inductor L8 are disposed in parallel in the width direction, thereby reducing the dimension in the length direction.
In an embodiment of the present invention, the center frequency of the band-pass filter 102 is 375MHz, the size of the filter device is 5.3mm × 2.5mm × 0.9mm, wherein the size of the band-pass filter 102 is 2.6mm × 2.5mm × 0.9mm, the sizes of the first low-pass filter 101 and the second low-pass filter 103 are both 1.35mm × 2.5mm × 0.9mm, the dielectric constant of the ceramic matrix material is 35 ± 1, and the material dielectric loss factor tan α is not more than 0.005. And the filtering device makes full use of the three-dimensional multilayer space through reasonable wiring, and the volume is obviously reduced.
Fig. 5 shows schematic diagrams of insertion loss and return loss curves of the filtering apparatus with wide stop band rejection provided by the present invention, and for convenience of illustration, only the portions related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
as can be seen from the figure, the center frequency of the band-pass filter 102 is 375MHz, the pass-band width is 200MHz, and the loss of the high-frequency parasitic pass-band is more than or equal to 25 dB.
Therefore, the filtering apparatus with wide stopband rejection has the following advantages:
(1) the device has the advantages of small volume, high reliability, simple manufacturing process and the like;
(2) the requirements of miniaturization, high reliability, high performance and low cost of a downstream electronic complete machine are met;
(3) the composite material is manufactured by adopting the LTCC process, has the advantage of low batch production cost and has great market competitiveness.
In summary, the embodiment of the present invention provides a filtering apparatus with wide stop band suppression, in which a band-pass filter and two symmetrically arranged low-pass filters are packaged in a ceramic substrate to form an integrated monolithic structure, and the band-pass filter is located in the middle. Therefore, the symmetrical low-pass filters are added at the input end and the output end of the band-pass filter to realize the suppression of high-order harmonics with wide stop band, and meanwhile, the size of the filtering device is reduced through reasonable arrangement on the wiring; meanwhile, the filtering device is manufactured by adopting an LTCC process, an integrated monolithic structure is formed, and the reliability is high, so that the problems that the size of the filtering device is large and the reliability is low in the existing signal filtering technology are solved. The embodiment of the invention is simple to realize, does not need to add extra hardware, can effectively reduce the cost and has stronger usability and practicability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A filtering device with wide stop band suppression is characterized in that the filtering device comprises an input end, an output end, a band-pass filter and two low-pass filters;
the two low-pass filters are symmetrically arranged relative to the band-pass filter, one low-pass filter is connected between the input end and the band-pass filter, the other low-pass filter is connected between the output end and the band-pass filter, and the band-pass filter and the two low-pass filters are packaged in a ceramic matrix to form an integrated monolithic structure;
the band-pass filter comprises four resonance units which are connected in parallel, namely a first resonance unit, a second resonance unit, a third resonance unit and a fourth resonance unit;
the first resonance unit is inductively coupled with the second resonance unit, the second resonance unit is connected with the third resonance unit through a capacitor, and the third resonance unit is inductively coupled with the fourth resonance unit.
2. The filtering apparatus according to claim 1, wherein the first resonant unit comprises a first inductor and a first capacitor, a first end of the first inductor is connected to a first end of the first capacitor, and a second end of the first inductor is connected to a second end of the first capacitor;
the second resonance unit comprises a second inductor and a second capacitor, wherein the first end of the second inductor is connected with the first end of the second capacitor, and the second end of the second inductor is grounded with the second end of the second capacitor;
the third resonant unit comprises a third inductor and a third capacitor, the first end of the third inductor is connected with the first end of the third capacitor, and the second end of the third inductor and the second end of the third capacitor are grounded;
the fourth resonant unit comprises a fourth inductor and a fourth capacitor, the first end of the fourth inductor is connected with the first end of the fourth capacitor, and the second end of the fourth inductor and the second end of the fourth capacitor are grounded.
3. The filtering apparatus as claimed in claim 2, wherein the first inductor and the first capacitor, the second inductor and the second capacitor, the third inductor and the third capacitor, and the fourth inductor and the fourth capacitor are all connected by a via cylinder.
4. The filtering apparatus according to claim 2, wherein the first inductor, the second inductor, the third inductor, and the fourth inductor are disposed in a predetermined region, and the first capacitor and the fourth capacitor, and the second capacitor and the third capacitor are respectively disposed on two sides of the predetermined region.
5. The filtering apparatus of claim 4, wherein the first capacitor and the fourth capacitor have a first plate facing away from the predefined area, the second capacitor and the third capacitor have a second plate facing away from the predefined area, and the first plate and the second plate are used for shielding signals.
6. The filtering apparatus of claim 1, wherein the two low-pass filters include a first low-pass filter and a second low-pass filter,
the first low-pass filter comprises a fifth inductor, a sixth inductor and a fifth capacitor;
the first end of the fifth inductor is the input end of the first low-pass filter, the second end of the fifth inductor is connected with the first end of the sixth inductor and the first end of the fifth capacitor in common, the second end of the sixth inductor is the output end of the first low-pass filter, and the second end of the fifth capacitor is grounded.
7. The filtering arrangement according to claim 6, characterized in that said fifth and sixth inductors have the same inductance value and are connected to said fifth capacitor by a vertical cylinder.
8. The filtering apparatus as claimed in claim 6, wherein said second low pass filter includes a seventh inductor, an eighth inductor and a sixth capacitor;
the first end of the seventh inductor is the input end of the second low-pass filter, the second end of the seventh inductor is commonly connected with the first end of the eighth inductor and the first end of the sixth capacitor, the second end of the eighth inductor is the output end of the second low-pass filter, and the second end of the sixth capacitor is grounded.
9. The filtering apparatus according to claim 8, wherein the inductance values of the seventh inductor and the eighth inductor are the same, and the seventh inductor and the eighth inductor are connected to the sixth capacitor through a vertical cylinder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710947082.4A CN107681236B (en) | 2017-10-12 | 2017-10-12 | Filter device with wide stop band suppression |
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| CN201710947082.4A CN107681236B (en) | 2017-10-12 | 2017-10-12 | Filter device with wide stop band suppression |
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| CN107681236B true CN107681236B (en) | 2020-01-17 |
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| CN111780780B (en) * | 2020-06-16 | 2022-06-03 | 贵州省人民医院 | Step counting method and device based on filter bank |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201204240Y (en) * | 2008-06-18 | 2009-03-04 | 中国航天科技集团公司第五研究院第五〇四研究所 | Integrated band-pass filter and low-pass filter component |
| CN201243075Y (en) * | 2008-03-28 | 2009-05-20 | 深圳市麦捷微电子科技股份有限公司 | Lamination sheet type microwave band-pass filter |
| CN103545582A (en) * | 2012-07-10 | 2014-01-29 | 南京理工大学 | UWB (ultra wide band) band-pass filter |
| CN103956985A (en) * | 2014-04-22 | 2014-07-30 | 南京理工大学 | Band-pass filter with multi-layer structure |
| KR101439420B1 (en) * | 2013-11-11 | 2014-09-11 | 주식회사 이너트론 | Resonator and filter having the same |
| CN206077571U (en) * | 2016-08-31 | 2017-04-05 | 江苏银河电子股份有限公司 | A kind of band filter of broadband high out-of-side rejection |
| CN207559025U (en) * | 2017-10-12 | 2018-06-29 | 深圳振华富电子有限公司 | The filter that Wide stop bands inhibit |
-
2017
- 2017-10-12 CN CN201710947082.4A patent/CN107681236B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201243075Y (en) * | 2008-03-28 | 2009-05-20 | 深圳市麦捷微电子科技股份有限公司 | Lamination sheet type microwave band-pass filter |
| CN201204240Y (en) * | 2008-06-18 | 2009-03-04 | 中国航天科技集团公司第五研究院第五〇四研究所 | Integrated band-pass filter and low-pass filter component |
| CN103545582A (en) * | 2012-07-10 | 2014-01-29 | 南京理工大学 | UWB (ultra wide band) band-pass filter |
| KR101439420B1 (en) * | 2013-11-11 | 2014-09-11 | 주식회사 이너트론 | Resonator and filter having the same |
| CN103956985A (en) * | 2014-04-22 | 2014-07-30 | 南京理工大学 | Band-pass filter with multi-layer structure |
| CN206077571U (en) * | 2016-08-31 | 2017-04-05 | 江苏银河电子股份有限公司 | A kind of band filter of broadband high out-of-side rejection |
| CN207559025U (en) * | 2017-10-12 | 2018-06-29 | 深圳振华富电子有限公司 | The filter that Wide stop bands inhibit |
Non-Patent Citations (1)
| Title |
|---|
| "多层宽带带通滤波器的设计与实现";黄正伟;《中国优秀硕士学位论文全文数据库信息科技辑》;20150515(第05期);第39页第9-19行、第44页第5-8行 * |
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