CN104183892A - Microwave filter of strip-line resonant cavity structure - Google Patents
Microwave filter of strip-line resonant cavity structure Download PDFInfo
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- CN104183892A CN104183892A CN201410409191.7A CN201410409191A CN104183892A CN 104183892 A CN104183892 A CN 104183892A CN 201410409191 A CN201410409191 A CN 201410409191A CN 104183892 A CN104183892 A CN 104183892A
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Abstract
The invention provides a microwave filter of a strip-line resonant cavity structure. The microwave filter comprises an input port, an input metal post, an input inductor, a first rectangular resonant cavity, a second rectangular resonant cavity, a third rectangular resonant cavity, a fourth rectangular resonant cavity, an output inductor, an output metal post, an output port and a metal shielding box; the input metal post, the output metal post, the input inductor, the output inductor, the first resonant cavity, the second resonant cavity, the third resonant cavity and the fourth resonant cavity are all located in the metal shielding box filled with ceramic media; the input port is connected with the input metal post, the input metal post is connected with the input inductor, the input inductor is connected with the first resonant cavity, the first resonant cavity is coupled with a broad side of the third resonant cavity, the third resonant cavity is coupled with a narrow side of the fourth resonant cavity, the fourth resonant cavity is coupled with a broad side of the second resonant cavity, the second resonant cavity is connected with the output inductor, the output inductor is connected with the output metal post, and the output metal post is connected with the output port. The microwave filter is small in size and good in filter performance.
Description
Technical field
The invention belongs to communication technical field, be specifically related to a kind of microwave filter of strip line cavity resonator structure.
Background technology
In recent years, microminiaturized developing rapidly along with mobile communication, satellite communication and Defensive Avionics System, high-performance, low cost and miniaturization have become the developing direction of microwave current/RF application, and the performance of microwave filter, size, reliability and cost are all had higher requirement.In some national defence tip device, present use frequency range is quite full, thus the tip device such as satellite communication towards millimeter wave band, develop, so microwave band filter has become that this wave band receives and transmitting branch in crucial electronic unit.Conventional microstrip line construction resonant cavity filter has a wide range of applications, yet the common volume of microstrip line resonant cavity filter is large, is not suitable for carrying out in small size designed system.
Summary of the invention
The object of the present invention is to provide a kind of microwave filter of strip line cavity resonator structure, its volume is little, filtering characteristic is good.
In order to solve the problems of the technologies described above, the invention provides a kind of microwave filter of strip line cavity resonator structure, comprise input port, input metal column, input inductance, the first rectangular cavity, the second rectangular cavity, the 3rd rectangular cavity, the 4th rectangular cavity, outputting inductance, output metal column, output port, metal shielding box;
Input metal column, output metal column, input inductance, outputting inductance, the first resonant cavity, the second resonant cavity, the 3rd resonant cavity, the 4th resonant cavity are all positioned at the metal shielding box of having filled ceramic dielectric;
Input port is connected with input metal column, input metal column is connected with input inductance, input inductance and the first resonant cavity be connected, the first resonant cavity and the 3rd resonant cavity are broadside coupled, the narrow limit coupling of the 3rd resonant cavity and the 4th resonant cavity, the 4th resonant cavity and the second resonant cavity are broadside coupled, and the second resonant cavity is connected with outputting inductance, outputting inductance is connected with metal column, and output metal column is connected with output port.
Compared with prior art, its remarkable advantage is in the present invention, and the present invention adopts 3-dimensional multi-layered structure, and realizes with low-loss low-temperature co-burning ceramic material, thereby makes that volume of the present invention is little, lightweight, reliability is high; Good filtering performance, standing wave is little, return loss is low; Circuit implementation structure is simple, can realize production in enormous quantities.
Accompanying drawing explanation
Fig. 1 is the structural representation of the microwave filter of strip line cavity resonator structure of the present invention.
Fig. 2 is the microwave filter S parameter characteristic curve of strip line cavity resonator structure of the present invention.
Fig. 3 is the microwave filter input/output port stationary wave characteristic curve of strip line cavity resonator structure of the present invention.
Embodiment
In conjunction with Fig. 1, the microwave filter of strip line cavity resonator structure of the present invention, comprises input port 1, input metal column 3, input inductance 4, the first rectangular cavity 5, the second rectangular cavity 8, the 3rd rectangular cavity 6, the 4th rectangular cavity 7, outputting inductance 9, output metal column 10, output port 2, metal shielding box 11.
Input metal column 3, output metal column 10, input inductance 4, outputting inductance 9, the first resonant cavity 5, the second resonant cavity 8, the 3rd resonant cavity 6, the 4th resonant cavity 7 are all positioned at the metal shielding box 11 of having filled ceramic dielectric.
Input inductance 4, the first rectangular cavity 5, the second rectangular cavity 8, outputting inductance 9 layer plane that coexists; The opening of the first rectangular cavity 5 and the second rectangular cavity 8 arranges in opposite directions;
The 3rd rectangular cavity 6, the 4th rectangular cavity 7 another layer plane that coexists, the opening of the 3rd rectangular cavity 6 and the 4th rectangular cavity 7 arranges dorsad;
The four edges of the four edges of the first rectangular cavity 5 and the 3rd rectangular cavity 6 is all not overlapping in the vertical direction, and opening arranges dorsad; The four edges of the four edges of the second rectangular cavity 8 and the 4th rectangular cavity 7 is all not overlapping in the vertical direction, and opening arranges dorsad;
Input port 1 is connected with input metal column 3, input metal column 3 is connected with input inductance 4, input inductance 4 and the first resonant cavity 5 be connected, the first resonant cavity 5 and the 3rd resonant cavity 6 are broadside coupled, the narrow limit coupling of the 3rd resonant cavity 6 and the 4th resonant cavity 7, the 4th resonant cavity 7 and the second resonant cavity 8 are broadside coupled, and the second resonant cavity 8 is connected with outputting inductance 9, outputting inductance 9 is connected with metal column 10, and output metal column 10 is connected with output port 2.
Input port 1 and output port 2 are 50 ohmage output ports of surface mounting structure.
Input metal column 3, input inductance 4, the first rectangular cavity 5, the second rectangular cavity 8, the 3rd rectangular cavity 6, the 4th rectangular cavity 7, outputting inductance 9, output metal column 10 and metallic enclosure 11 all adopt multilayer LTCC technique to realize.
The present invention is in undersized design, adopt 3-dimensional multi-layered structure, four resonant cavitys are distributed in to the two-layer Different Plane in can between two, effectively reduced the overall volume of filter, in spatial relationship, between each resonance level, introduce cross-couplings, thereby reach good stationary wave characteristic and suppress sideband characteristic simultaneously.
The present invention is owing to adopting multilayer LTCC technique to realize, its low-temperature co-burning ceramic material and metallic pattern sintering at about 900 ℃ of temperature forms, so there is extreme high reliability and temperature stability, because structure adopts 3-dimensional multi-layered structure and outer surface metallic shield, be grounded and encapsulate, thereby volume is significantly reduced.
In order to further illustrate beneficial effect of the present invention, used Ansoft HFSS14 Electromagnetic Simulation software to carry out 3 D electromagnetic emulation to the microwave filter of strip line cavity resonator structure of the present invention, the microwave filter emulation size of strip line cavity resonator structure of the present invention is only 3.1mm * 5.1mm * 0.67mm, and size is little; The dielectric constant of ceramic dielectric is 5.9.Fig. 2 is the microwave filter S parameter characteristic curve of strip line cavity resonator structure, its transverse axis is frequency, unit is GHz, the longitudinal axis is S parameter, and unit is dB, as shown in Figure 2, filter passband bandwidth is 19.65GHz～20.25GHz, logical in-band insertion loss is less than 1.5dB, and lower sideband suppresses to be better than 25dB, and filter sideband characteristic is good.Fig. 3 is the microwave filter input/output port stationary wave characteristic curve of strip line cavity resonator structure, and its transverse axis is frequency, and unit is GHz, and the longitudinal axis is standing wave, and without unit, as shown in Figure 3, input/output port standing-wave ratio is less than 1.55, and the stationary wave characteristic of this filter is good.
Claims (5)
1. the microwave filter of a strip line cavity resonator structure, it is characterized in that, comprise input port (1), input metal column (3), input inductance (4), the first rectangular cavity (5), the second rectangular cavity (8), the 3rd rectangular cavity (6), the 4th rectangular cavity (7), outputting inductance (9), output metal column (10), output port (2), metal shielding box (11);
Input metal column (3), output metal column (10), input inductance (4), outputting inductance (9), the first resonant cavity (5), the second resonant cavity (8), the 3rd resonant cavity (6), the 4th resonant cavity (7) are all positioned at the metal shielding box (11) of having filled ceramic dielectric;
Input port (1) is connected with input metal column (3), input metal column (3) is connected with input inductance (4), input inductance (4) with the first resonant cavity (5) be connected, the first resonant cavity (5) is broadside coupled with the 3rd resonant cavity (6), the 3rd resonant cavity (6) and the 4th resonant cavity (7) narrow limit coupling, the 4th resonant cavity (7) is broadside coupled with the second resonant cavity (8), the second resonant cavity (8) is connected with outputting inductance (9), outputting inductance (9) is connected with metal column (10), and output metal column (10) is connected with output port (2).
2. the microwave filter of strip line cavity resonator structure as claimed in claim 1, it is characterized in that, input inductance (4), the first rectangular cavity (5), the second rectangular cavity (8), outputting inductance (9) layer plane that coexists, and the opening of the first rectangular cavity (5) and the second rectangular cavity (8) arranges in opposite directions; The 3rd rectangular cavity (6), the 4th rectangular cavity (7) another layer plane that coexists, and the opening of the 3rd rectangular cavity (6) and the 4th rectangular cavity (7) arranges dorsad.
3. the microwave filter of strip line cavity resonator structure as claimed in claim 1, is characterized in that, the four edges of the four edges of the first rectangular cavity (5) and the 3rd rectangular cavity (6) is all not overlapping in the vertical direction, and opening arranges dorsad; The four edges of the four edges of the second rectangular cavity (8) and the 4th rectangular cavity (7) is all not overlapping in the vertical direction, and opening arranges dorsad.
4. the microwave filter of strip line cavity resonator structure as claimed in claim 1, is characterized in that, input port (1) and output port (2) are 50 ohmage output ports of surface mounting structure.
5. the microwave filter of strip line cavity resonator structure as claimed in claim 1, it is characterized in that, input metal column (3), input inductance (4), the first rectangular cavity (5), the second rectangular cavity (8), the 3rd rectangular cavity (6), the 4th rectangular cavity (7), outputting inductance (9), output metal column (10) and metallic enclosure (11) all adopt multilayer LTCC technique to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410409191.7A CN104183892A (en) | 2014-08-19 | 2014-08-19 | Microwave filter of strip-line resonant cavity structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410409191.7A CN104183892A (en) | 2014-08-19 | 2014-08-19 | Microwave filter of strip-line resonant cavity structure |
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Citations (6)
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| CN1239846A (en) * | 1998-06-18 | 1999-12-29 | 财团法人工业技术研究院 | Miniature multilayer ceramic filter |
| CN101609914A (en) * | 2009-05-20 | 2009-12-23 | 电子科技大学 | A kind of LTCC band-pass filter with harmonic suppression |
| WO2010061080A1 (en) * | 2008-11-28 | 2010-06-03 | Arnaud Sauvaget | Class of dual mode resonators made from a multilayer stack of organic laminates improving the performance and compactness of integrated passive components |
| CN103187603A (en) * | 2013-03-25 | 2013-07-03 | 华南理工大学 | Wide-stopband LTCC (low temperature co-fired ceramic) band-pass filter based on magnetoelectric coupling counteraction technology |
| CN103457007A (en) * | 2013-09-06 | 2013-12-18 | 南京理工大学 | High-performance distributed 3100-3400 MHz miniature band-pass filter |
| CN103985930A (en) * | 2014-05-09 | 2014-08-13 | 南京理工大学 | Band-pass filter of novel snap ring strip line structure |
-
2014
- 2014-08-19 CN CN201410409191.7A patent/CN104183892A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1239846A (en) * | 1998-06-18 | 1999-12-29 | 财团法人工业技术研究院 | Miniature multilayer ceramic filter |
| WO2010061080A1 (en) * | 2008-11-28 | 2010-06-03 | Arnaud Sauvaget | Class of dual mode resonators made from a multilayer stack of organic laminates improving the performance and compactness of integrated passive components |
| CN101609914A (en) * | 2009-05-20 | 2009-12-23 | 电子科技大学 | A kind of LTCC band-pass filter with harmonic suppression |
| CN103187603A (en) * | 2013-03-25 | 2013-07-03 | 华南理工大学 | Wide-stopband LTCC (low temperature co-fired ceramic) band-pass filter based on magnetoelectric coupling counteraction technology |
| CN103457007A (en) * | 2013-09-06 | 2013-12-18 | 南京理工大学 | High-performance distributed 3100-3400 MHz miniature band-pass filter |
| CN103985930A (en) * | 2014-05-09 | 2014-08-13 | 南京理工大学 | Band-pass filter of novel snap ring strip line structure |
Non-Patent Citations (1)
| Title |
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| 李奇: "无线通信中微带滤波器的研究与设计", 《博士论文》, 31 December 2011 (2011-12-31) * |
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| CB03 | Change of inventor or designer information |
Inventor after: Dai Yongsheng Inventor after: Luo Ming Inventor after: Zhou Yanfang Inventor after: Chen Long Inventor after: Xu Xinying Inventor before: Luo Ming Inventor before: Zhou Yanfang Inventor before: Chen Long Inventor before: Xu Xinying Inventor before: Dai Yongsheng |
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Free format text: CORRECT: INVENTOR; FROM: LUO MING ZHOU YANFANG CHEN LONG XU XINYING DAI YONGSHENG TO: DAI YONGSHENG LUO MING ZHOU YANFANG CHEN LONG XU XINYING |
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Application publication date: 20141203 |