CN102571020A - P wave band higher-order harmonic suppression micro low pass filter - Google Patents
P wave band higher-order harmonic suppression micro low pass filter Download PDFInfo
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Abstract
The invention relates to a P wave band higher-order harmonic suppression micro low pass filter. The low pass filter comprises a 50-ohm impedance input/output interface which is suitable for surface mounting, and three inductors, four ground capacitors, two zero capacitors and input and output inductors realized by using a lumped parameter strip line structure. The structures are realized by adopting a multilayer low-temperature co-firing ceramic process technology. The low pass filter has the advantages of high pass band selectivity, deep harmonic suppression, small size, light weight, high reliability, high electric performance, high phase frequency characteristic linearity, high temperature stability, high electric performance batch consistence, low cost, batch production and the like, and is particularly suitable for wireless communication handheld and portable terminal products such as radars, communication, rocket mounting, machine mounting, bullet mounting, spaceships, individual soldier mobile communication terminals and the like, occasions with severe requirements on size, weight, electric performance, reliability and the like, and corresponding frequency band systems.
Description
Technical field
The present invention relates to a kind of filter, the miniature low pass filter of particularly a kind of pattern-band high harmonic inhibition.
Background technology
Development along with systems such as microwave and millimeter wave communication, radars; Especially the continuous miniaturization of microwave and millimeter wave communication module in ambulatory handheld formula wireless communication terminal, individual soldier's satellite mobile communication terminal, military and civilian multimode multiplex communication terminal, airborne, missile-borne, the aerospace communication system; Band pass filter is as the crucial electronic unit in corresponding wave band reception and the transmitting branch, and the miniature low pass filter of low-loss pattern-band high harmonic inhibition is an important developing direction.The key technical indexes of describing this component capabilities has: cut-off frequecy of passband, stop-band frequency scope, passband input/output voltage standing-wave ratio, passband insert loss, stopband attenuation, insertion phase shift and delay/frequency characteristic, temperature stability, volume, weight, reliability etc.With the filter of conventional method design, all there is volume and inserts the bigger shortcoming of loss like hair clip type filter construction, resonant cavity filter structure and coaxial line filter structure etc., for requiring harsh application scenario often can't use.
Summary of the invention
The object of the present invention is to provide the miniature low pass filter of pattern-band high harmonic inhibition that a kind of volume is little, in light weight, reliability is high, temperature performance is stablized, electrical property excellent, electrical property consistency is good, cost is low in batches.
The technical scheme that realizes the object of the invention is: the miniature low pass filter of a kind of pattern-band high harmonic inhibition is characterized in that: comprise 50 ohmage input ports, input inductance, first ground capacity, first order series inductance, second ground capacity, second level series inductance, the 3rd ground capacity, third level series inductance, the 4th ground capacity, first order minimum capacity, second level minimum capacity, the outputting inductance of mounted on surface, 50 ohmage output port and earth terminals of mounted on surface; 50 ohmage input ports, the one termination input signal of mounted on surface; One end of another termination input inductance; The other end of input inductance is connected with the public connecting end of first ground capacity, first order series inductance, first order minimum capacity, and wherein first order series inductance and first order minimum capacity compose in parallel first order parallel resonance unit; The other end of first order parallel resonance unit is connected with the common port of second ground capacity, second level series inductance, second level minimum capacity, and wherein second level series inductance and second level minimum capacity compose in parallel parallel resonance unit, the second level; The other end of parallel resonance unit, the second level is connected with the common port of third level series inductance, the 3rd ground capacity; The other end of third level series inductance is connected with the common port of the 4th ground capacity, outputting inductance, and the other end of outputting inductance is connected with an end of output port, another termination output signal of output port; The other end of first ground capacity, second ground capacity, the 3rd ground capacity, the 4th ground capacity is ground connection respectively.
The present invention compared with prior art, its remarkable advantage is: (1) passband internal loss is low, harmonic wave suppresses dark; (2) the Q value is high; (3) volume is little, in light weight, reliability is high; (4) electrical property is excellent, the phase-frequency characteristic linear change; (5) the electrical property temperature stability is high; (6) electrical property consistency is good, can realize producing in enormous quantities; (7) cost is low; (8) easy to install and use, can use full-automatic chip mounter to install and welding; (9) be specially adapted in the radio communication handheld terminals such as rocket, airborne, missile-borne, spaceship, individual soldier's mobile communication terminal, and volume, weight, performance, reliability are had in the harsh communication system that requires.
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
Description of drawings
Fig. 1 is the electrical schematic diagram of the miniature low pass filter of pattern-band high harmonic inhibition of the present invention.
Fig. 2 is the profile and the internal structure sketch map of the miniature low pass filter of pattern-band high harmonic inhibition of the present invention.
Fig. 3 is the three-dimensional all-wave simulation performance of the miniature low pass filter of a pattern-band high harmonic inhibition of the present invention curve.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
In conjunction with Fig. 1; The present invention is the miniature low pass filter of a kind of pattern-band high harmonic inhibition, and this filter comprises 50 ohmage input port P1, input inductance Lin, the first ground capacity C1, first order series inductance L1, the second ground capacity C2, second level series inductance L2, the 3rd ground capacity C3, third level series inductance L3, the 4th ground capacity C4, first order minimum capacity C5, second level minimum capacity C6, the outputting inductance Lout of mounted on surface, 50 ohmage output port P2 and earth terminals of mounted on surface; 50 ohmage input port P1, the one termination input signal of mounted on surface; The end of another termination input inductance Lin; The other end of input inductance Lin is connected with the public connecting end of the first ground capacity C1, first order series inductance L1, first order minimum capacity C5, and wherein first order series inductance L1 and first order minimum capacity C5 compose in parallel first order parallel resonance unit L1C5; The other end of first order parallel resonance unit L1C5 is connected with the common port of the second ground capacity C2, second level series inductance L2, second level minimum capacity C6, and wherein second level series inductance L2 and second level minimum capacity C6 compose in parallel parallel resonance unit, second level L2C6; The other end of parallel resonance unit, second level L2C6 is connected with the common port of third level series inductance L3, the 3rd ground capacity C3; The other end of third level series inductance L3 is connected with the common port of the 4th ground capacity C4, outputting inductance Lout, and the other end of outputting inductance Lout is connected with the end of output port P2, another termination output signal of output port P2; The other end of the first ground capacity C1, the second ground capacity C2, the 3rd ground capacity C3, the 4th ground capacity C4 is ground connection respectively.
In conjunction with Fig. 2; The miniature low pass filter of pattern-band high harmonic inhibition of the present invention, 50 ohmage output port P2 of input port P1, input inductance Lin, the first ground capacity C1, first order series inductance L1, the second ground capacity C2, second level series inductance L2, the 3rd ground capacity C3, third level series inductance L3, the 4th ground capacity C4, first order minimum capacity C5, second level minimum capacity C6, outputting inductance Lout, mounted on surface and earth terminal all adopt multilayer LTCC technology to realize; Wherein input inductance Lin, first order series inductance L1, outputting inductance Lout all adopt the strip line of distributed constant to realize; Second level series inductance L2, third level series inductance L3 all adopt the multilayer coupling strip line to form with the circular, fashion coiling, and interlayer links to each other through manhole; The first ground capacity C1, the second ground capacity C2, the 3rd ground capacity C3, the 4th ground capacity C4, first order minimum capacity C5, second level minimum capacity C6 all adopt media plate electric capacity to realize.
In conjunction with Fig. 2; The miniature low pass filter of pattern-band high harmonic inhibition of the present invention; The first ground capacity C1, the second ground capacity C2, the 3rd ground capacity C3, the 4th ground capacity C4 all adopt the two layer medium capacity plate antenna to realize; Wherein one deck strip line connects the end of first order series inductance L1, second level series inductance L2, third level series inductance L3 respectively, and another layer is ground.
The miniature low pass filter of pattern-band high harmonic inhibition of the present invention; Its operation principle is summarized as follows: the broadband microwave signal of input arrives the end that first order series inductance L1 links to each other with first order minimum capacity C5 among an end and the first order parallel resonance unit L1C5 of the first ground capacity C1 through input port P1 through input inductance Lin; In the described broadband microwave signal; Get into the first order parallel resonance unit L1C5 between the first ground capacity C1 and the second ground capacity C2 near the microwave signal the first ground capacity C1; Near all the other non-first ground capacity C1 microwave signal realizes first order filtering through the first ground capacity C1 ground connection.Near the parallel resonance frequency of first order parallel resonance unit L1C5 microwave signal; Be suppressed because of presenting high impedance, near the microwave frequency signal non-first resonance frequency arrives among the second ground capacity C2 through first order series inductance L1 among the first order parallel resonance unit L1C5 and first order minimum capacity C5.The end of parallel resonance unit, second level L2C6 between the end of the second ground capacity C2 and the second ground capacity C2 and the 3rd ground capacity C3; Microwave signal through first order filtering and first order parallel resonance unit L1C5; Near the second ground capacity C2 microwave signal gets into parallel resonance unit, second level L2C6; Near all the other non-second ground capacity C2 microwave signal realizes second level filtering through the second ground capacity C2 ground connection.Near the parallel resonance frequency of parallel resonance unit, second level L2C6 microwave signal; Be suppressed because of presenting high impedance, near the microwave frequency signal non-second resonance frequency arrives among the 3rd ground capacity C3 through second level series inductance L2 among parallel resonance unit, the second level L2C6 and second level minimum capacity C6.The end of the end of the 3rd ground capacity C3 and third level series inductance L3; Through the first order, second level filtering and first order parallel resonance unit L1C5; The microwave signal of parallel resonance unit, second level L2C6; Near the 3rd ground capacity C3 microwave signal gets into third level series inductance L3, and near the microwave signal all the other non-the 3rd ground capacity C3 realizes third level filtering through the 3rd ground capacity C3 ground connection.Near the third level series inductance L3 microwave signal is suppressed because of presenting high impedance, and near the microwave frequency signal the non-third level series inductance L3 arrives among the 4th ground capacity C4 through third level series inductance L3.The end of the 4th ground capacity C4; Through the first order, the second level, third level filtering and first order parallel resonance unit L1C5; Parallel resonance unit, second level L2C6, the microwave signal of third level series inductance L3, near the microwave signal the 4th ground capacity C4 connect the end of surface-pasted 50 ohmage output port P2 through outputting inductance Lout; Near all the other non-the 4th ground capacity C4 microwave signal realizes fourth stage filtering through the 4th ground capacity C4 ground connection.Through first order filtering, second level filtering, third level filtering, fourth stage filtering; First order parallel resonance unit L1C5; Parallel resonance unit, second level L2C6; The microwave signal of third level series inductance L3 through the other end output of surface-pasted 50 ohmage output port P2, thereby realizes the miniature low pass filter of pattern-band high harmonic inhibition.
The miniature low pass filter of pattern-band high harmonic inhibition is owing to be to adopt multilayer LTCC technology to realize; Its low-temperature co-burning ceramic material and metallic pattern form at about 900 ℃ of sintering temperatures; So have extreme high reliability and temperature stability; 3 D stereo is integrated to be grounded and to encapsulate with multilayer folding structure and outer surface metallic shield because structure adopts, thereby volume is significantly reduced.
It is 4.5mm * 3.2mm * 1.5mm that the miniature low pass filter of pattern-band high harmonic inhibition is implemented volume.This filter cutoff frequency is 0.28GHz, and the logical in-band insertion loss of simulation filter device is all less than 0.3 decibel, and 0.8GHz to 6GHz stopband suppresses to be superior to-40 decibels, has good performance of filter.
Claims (3)
1. miniature low pass filter of pattern-band high harmonic inhibition is characterized in that: comprise 50 ohmage input ports (P1), input inductance (Lin), first ground capacity (C1), first order series inductance (L1), second ground capacity (C2), second level series inductance (L2), the 3rd ground capacity (C3), third level series inductance (L3), the 4th ground capacity (C4), first order minimum capacity (C5), second level minimum capacity (C6), the outputting inductance (Lout) of mounted on surface, 50 ohmage output port (P2) and earth terminals of mounted on surface; 50 ohmage input ports (P1) termination input signal of mounted on surface; One end of another termination input inductance (Lin); The other end of input inductance (Lin) is connected with the public connecting end of first ground capacity (C1), first order series inductance (L1), first order minimum capacity (C5); Wherein first order series inductance (L1) and first order minimum capacity (C5) compose in parallel first order parallel resonance unit (L1, C5); First order parallel resonance unit (L1; C5) the other end is connected with the common port of second ground capacity (C2), second level series inductance (L2), second level minimum capacity (C6); Wherein second level series inductance (L2) and second level minimum capacity (C6) compose in parallel parallel resonance unit, the second level (L2, C6); Parallel resonance unit, the second level (L2, other end C6) is connected with the common port of third level series inductance (L3), the 3rd ground capacity (C3); The other end of third level series inductance (L3) is connected with the common port of the 4th ground capacity (C4), outputting inductance (Lout); The other end of outputting inductance (Lout) is connected with an end of output port (P2), another termination output signal of output port (P2); The other end of first ground capacity (C1), second ground capacity (C2), the 3rd ground capacity (C3), the 4th ground capacity (C4) is ground connection respectively.
2. the miniature low pass filter of pattern-band high harmonic inhibition according to claim 1 is characterized in that: 50 ohmage output ports (P2) of input port (P1), input inductance (Lin), first ground capacity (C1), first order series inductance (L1), second ground capacity (C2), second level series inductance (L2), the 3rd ground capacity (C3), third level series inductance (L3), the 4th ground capacity (C4), first order minimum capacity (C5), second level minimum capacity (C6), outputting inductance (Lout), mounted on surface and earth terminal all adopt multilayer LTCC technology to realize; Wherein input inductance (Lin), first order series inductance (L1), outputting inductance (Lout) all adopt the strip line of distributed constant to realize; Second level series inductance (L2), third level series inductance (L3) all adopt the multilayer coupling strip line to form with the circular, fashion coiling, and interlayer links to each other through manhole; First ground capacity (C1), second ground capacity (C2), the 3rd ground capacity (C3), the 4th ground capacity (C4), first order minimum capacity (C5), second level minimum capacity (C6) all adopt media plate electric capacity to realize.
3. the miniature low pass filter of pattern-band high harmonic inhibition according to claim 1; It is characterized in that: first ground capacity (C1), second ground capacity (C2), the 3rd ground capacity (C3), the 4th ground capacity (C4) all adopt the two layer medium capacity plate antenna to realize that wherein one deck strip line connects first order series inductance (L1), second level series inductance (L2), the 3rd respectively
One end of level series inductance (L3), another layer is ground.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311627A (en) * | 2012-12-29 | 2013-09-18 | 南京理工大学 | P-waveband lumped-type miniature balun |
| CN103986435A (en) * | 2014-04-14 | 2014-08-13 | 中国电子科技集团公司第五十五研究所 | Miniaturized wide-stop-band restraint LTCC low-pass filter |
| CN109639253A (en) * | 2018-12-13 | 2019-04-16 | 广州海格通信集团股份有限公司 | A kind of reusable miniaturization harmonic filter of inductance |
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| JPH10336057A (en) * | 1997-06-04 | 1998-12-18 | Yokowo Co Ltd | Antenna booster for receiving am |
| CN101729036A (en) * | 2009-04-24 | 2010-06-09 | 南京理工大学 | High stop-band restraining microwave intermediate frequency band pass filter |
| CN102006027A (en) * | 2010-11-24 | 2011-04-06 | 南京理工大学 | C-band low-loss and high-inhibition micro band-pass filter |
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2012
- 2012-03-22 CN CN201210078084.1A patent/CN102571020B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10336057A (en) * | 1997-06-04 | 1998-12-18 | Yokowo Co Ltd | Antenna booster for receiving am |
| CN101729036A (en) * | 2009-04-24 | 2010-06-09 | 南京理工大学 | High stop-band restraining microwave intermediate frequency band pass filter |
| CN102006027A (en) * | 2010-11-24 | 2011-04-06 | 南京理工大学 | C-band low-loss and high-inhibition micro band-pass filter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311627A (en) * | 2012-12-29 | 2013-09-18 | 南京理工大学 | P-waveband lumped-type miniature balun |
| CN103986435A (en) * | 2014-04-14 | 2014-08-13 | 中国电子科技集团公司第五十五研究所 | Miniaturized wide-stop-band restraint LTCC low-pass filter |
| CN103986435B (en) * | 2014-04-14 | 2017-02-22 | 中国电子科技集团公司第五十五研究所 | Miniaturized wide-stop-band restraint LTCC low-pass filter |
| CN109639253A (en) * | 2018-12-13 | 2019-04-16 | 广州海格通信集团股份有限公司 | A kind of reusable miniaturization harmonic filter of inductance |
| CN109639253B (en) * | 2018-12-13 | 2023-03-07 | 广州海格通信集团股份有限公司 | Inductor-reusable miniaturized harmonic filter |
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