CN101729036B - High stop-band restraining microwave intermediate frequency band pass filter - Google Patents
High stop-band restraining microwave intermediate frequency band pass filter Download PDFInfo
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- CN101729036B CN101729036B CN200910031027A CN200910031027A CN101729036B CN 101729036 B CN101729036 B CN 101729036B CN 200910031027 A CN200910031027 A CN 200910031027A CN 200910031027 A CN200910031027 A CN 200910031027A CN 101729036 B CN101729036 B CN 101729036B
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Abstract
The invention discloses a high stop-band restraining microwave intermediate frequency band pass filter, comprising a 50 ohms impedance input port installed on surface, an input inductance, a first level parallel resonance unit, a first level coupling capacitor, a first resetting circuit, a second level coupling capacitor, a second level parallel resonance unit, a third coupling capacitor, a second resetting circuit, a fourth coupling capacitor, a third level parallel resonance unit, and an output inductance. The 50 ohms impedance input port installed on surface is grounded by adopting multi-layer low-temperature ceramic technology. The invention has the advantages of small volume, light weight, high reliability, excellent electrical property, linear change for phase frequency characteristic, fine temperature stability, uniformity of electrical property index, low cost for mass production, and the like. The invention is specially fit for wireless communication handling terminals such as, rocket, sky-borne, missle-borne, spacecraft, individual mobile communication terminal, and the like, and the corresponding systems which have high demand of volume, weight, property and reliability.
Description
Technical field
The invention belongs to the electronic unit that is used for wireless communication systems such as microwave and millimeter wave communication, digital radar, individual soldier's satellite mobile communication terminal, military and civilian multimode and multiplex communication terminal, airborne, missile-borne, aerospace, particularly a kind of high stopband restraining microwave if bandpas filter.
Background technology
In systems such as microwave and millimeter wave communication, radar; Especially in ambulatory handheld formula wireless communication terminal and individual soldier's satellite mobile communication terminal and military and civilian multimode and multiplex communication terminal, airborne, missile-borne, the aerospace communication system; High stopband restraining microwave if bandpas filter is the crucial electronic unit in this wave band reception and the transmitting branch, and the key technical indexes of describing this component capabilities has: passband operating frequency range, stop-band frequency scope, passband input/output voltage standing-wave ratio, passband insert loss, stopband attenuation, form factor, temperature stability, volume, weight, reliability etc.(300MHz～1GHz) is owing to wavelength is grown (0.3 meter to 1 meter of wavelength at the microwave frequency low side for conventional design and manufacturing approach.); The volume of filter is directly proportional with operation wavelength, so volume is big (generally is about 45mm * 32mm * 8mm), and adopts the SAW filter technology; Though volume can reduce; But its electrical property has the temperature drift shortcoming, and cost is high, the insertion loss is bigger, requires high and insert the low application scenario of loss requirement all to be very limited in temperature stability.
Summary of the invention
The object of the present invention is to provide the high stopband restraining microwave if bandpas filter that a kind of volume is little, in light weight, reliability is high, temperature performance is stablized, electrical property excellent, rate of finished products is high, electrical property consistency is good, cost is low in batches.
The technical solution that realizes the object of the invention is: a kind of high stopband restraining microwave if bandpas filter, 50 ohmage input ports, input inductance, first order parallel resonance unit, first blocking condenser, the first zero that comprises mounted on surface are provided with between circuit, second blocking condenser, parallel resonance unit, the second level, the third level 50 ohmage output port and earth terminals of coupling capacitance, third level parallel resonance unit, outputting inductance, mounted on surface between coupling capacitance, the second reset circuit, the fourth stage; First order parallel resonance unit is formed in parallel by first inductance and first electric capacity; Parallel resonance unit, the second level is formed in parallel by second inductance and second electric capacity; Third level parallel resonance unit is formed in parallel by the 3rd inductance and the 3rd electric capacity; The first zero is provided with circuit and is formed in parallel by first zero inductance and first zero electric capacity, the second reset circuit by second zero point inductance and second minimum capacity be formed in parallel; 50 ohmage input ports, the one termination input signal of mounted on surface; One end of another termination input inductance of input port; One end of first order parallel resonance unit is connected with the other end of input inductance and an end of first blocking condenser respectively; The other end of first order parallel resonance unit links to each other with earth terminal, and the other end of described first blocking condenser connects the end that the first zero is provided with circuit, and the first zero is provided with an end of coupling capacitance between another termination second level of circuit; The other end of second blocking condenser connects an end of coupling capacitance between an end and the third level of parallel resonance unit, the second level respectively; The other end ground connection of parallel resonance unit, the second level, the other end of coupling capacitance is connected with the second reset circuit between the described third level, and one end of coupling capacitance is connected between the other end of the second reset circuit and the fourth stage; The other end of coupling capacitance connects an end and outputting inductance one end of third level parallel resonance unit respectively between this fourth stage; The other end ground connection of third level parallel resonance unit, the other end of outputting inductance is connected with an end of output port, the other end output signal of output port; All input ports, input inductance, first order parallel resonance unit, first blocking condenser, the first zero are provided with between circuit, second blocking condenser, parallel resonance unit, the second level, the third level between coupling capacitance, the second reset circuit, the fourth stage coupling capacitance, third level parallel resonance unit, outputting inductance, output port and earth terminal and all adopt multilayer and realize with LTCC technology, wherein input inductance, outputting inductance, first zero inductance, second zero point inductance all adopt the strip line of distributed constant to realize; First, second, third and fourth blocking condenser adopts media plate electric capacity and distributed constant electric capacity to realize; First order parallel resonance unit, parallel resonance unit, the second level, third level parallel resonance unit adopt five layers of folding coupling strip line structure of distributed constant to realize that wherein every layer of strip line one end is unsettled, other end ground connection; The first zero is provided with inductance in the circuit; Adopt the strip line of distributed constant to realize; The first zero is provided with in the circuit first zero electric capacity and adopts space coupling and the realization of distributed constant electric capacity between the first order and two parallel resonance unit, the second level between first order parallel resonance unit and the parallel resonance unit, the second level; Between parallel resonance unit, the second level and the third level parallel resonance unit in the second reset circuit; Inductance in the second reset circuit; Adopt the strip line of distributed constant to realize, between parallel resonance unit, the second level and the third level parallel resonance unit in the second reset circuit second minimum capacity adopt space coupling and the realization of distributed constant electric capacity between the second level and two parallel resonance unit of the third level.
The present invention compared with prior art, its remarkable advantage: (1) volume is little, in light weight, reliability is high; (2) electrical property is excellent, and, stopband low like the passband Insertion Loss suppresses high; (3) the electrical property temperature stability is high; (4) the circuit implementation structure is simple; (5) electrical property consistency is good, can realize producing in enormous quantities; (6) cost is low; (7) easy to install and use, can install and welding with full-automatic chip mounter; (8) 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 corresponding system that requires.
Below in conjunction with accompanying drawing the present invention is described in further detail.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present invention.
Fig. 2 is profile of the present invention and internal structure sketch map.
Fig. 3 is a parallel resonance cellular construction sketch map of the present invention.
Fig. 4 is the photo in kind of embodiments of the invention.
Fig. 5 is the main performance test result of the embodiment of the invention.
Embodiment
In conjunction with Fig. 1, Fig. 2, Fig. 3, a kind of high stopband restraining microwave if bandpas filter of the present invention comprises 50 ohmage input port P1 of mounted on surface; Input inductance L4, first order parallel resonance unit L1, C1, the first blocking condenser C4; The first zero is provided with circuit L12, C12, the second blocking condenser C5, parallel resonance unit, second level L2, C2; Coupling capacitance C6 between the third level, the second reset circuit L23, C23, coupling capacitance C7 between the fourth stage; Third level parallel resonance unit L3, C3, outputting inductance L5,50 ohmage output port P2 and earth terminals of mounted on surface; Input port P1 is connected with input inductance L4; Output port P2 is connected with outputting inductance L5; First order parallel resonance unit L1 between this outputting inductance L5 and the input inductance L4, C1, parallel resonance unit, second level L2, C2 and third level parallel resonance unit L3, the equal ground connection of C3; Between first order parallel resonance unit L1, C1 and parallel resonance unit, second level L2, C2, the connect first blocking condenser C4, the second blocking condenser C5, the series connection first zero is provided with circuit L12, C12 between the first blocking condenser C4 and the second blocking condenser C5; The coupling capacitance C7 between coupling capacitance C6, the fourth stage that connects between parallel resonance unit, second level L2, C2 and third level parallel resonance unit L3, the C3 between the third level is at the series connection second reset circuit L23, C23 between the coupling capacitance C7 between the coupling capacitance C6 and the fourth stage between the third level.
In the high stopband restraining of the present invention microwave if bandpas filter; 50 ohmage input port P1, the one termination input signal of mounted on surface; The end of another termination input inductance of input port P1 L4; First order parallel resonance unit L1, C1 are formed in parallel by first inductance L 1 and first capacitor C 1; The end of first order parallel resonance unit L1, C1 is connected with the other end of input inductance L4 and the end of the first blocking condenser C4 respectively, and the other end of first order parallel resonance unit L1, C1 links to each other with earth terminal; The first zero is provided with circuit L12, C12 is formed in parallel by first zero inductance L 12 and first zero capacitor C 12; The other end of the described first blocking condenser C4 connects the end that the first zero is provided with circuit L12, C12; The first zero is provided with the end of coupling capacitance C5 between another termination second level of circuit L12, C12; The other end of the second blocking condenser C5 connects the end of coupling capacitance C6 between an end and the third level of parallel resonance unit, second level L2, C2 respectively; Parallel resonance unit, second level L2, C2 are formed in parallel by second inductance L 2 and second capacitor C 2; The other end ground connection of parallel resonance unit, second level L2, C2; The other end of coupling capacitance C6 is connected with the second reset circuit L23, C23 between the described third level; The second reset circuit L23, C23 by second zero point inductance L 23 and the second minimum capacity C23 be formed in parallel, the end of coupling capacitance C7 is connected between the other end of the second reset circuit L23, C23 and the fourth stage, the other end of coupling capacitance C7 connects an end and outputting inductance L5 one end of third level parallel resonance unit L3, C3 respectively between this fourth stage; Third level parallel resonance unit L3, C3 are formed in parallel by the 3rd inductance L 3 and the 3rd capacitor C 3; The other end ground connection of third level parallel resonance unit L3, C3, the other end of outputting inductance L5 is connected with the end of output port P2, the other end output signal of output port P2.
In the high stopband restraining of the present invention microwave if bandpas filter; All input port P1, input inductance L4, first order parallel resonance unit L1, C1, the first blocking condenser C4, the first zero are provided with between circuit L12, C12, the second blocking condenser C5, parallel resonance unit, second level L2, C2, the third level between coupling capacitance C6, the second reset circuit L23, C23, the fourth stage coupling capacitance C7, third level parallel resonance unit L3, C3, outputting inductance L5, output port P2 and earth terminal and all adopt multilayer and realize with LTCC technology; Wherein input inductance L4, outputting inductance L5, first zero inductance L 12, second zero point inductance L 23 all adopt the strip line of distributed constant to realize; Three parallel resonance unit C1, L1; C2, L2; C3, L3 adopt five layers of folding coupling strip line to realize, like Fig. 3.The first zero capacitor C 12 and the second minimum capacity C23 all adopt first and second grade parallel resonance unit L1, C1; L2, C2, second and third level parallel resonance unit L2, C2; Space coupling and distributed constant electric capacity are realized between L3, the C3, and first, second, third and fourth blocking condenser C4, C5, C6, C7 adopt media plate electric capacity and distributed constant electric capacity to realize.(l * w * d) be: 4.5mm * 3.2mm * 1.5mm, weight is less than 0.1 gram for the size of high stopband restraining microwave if bandpas filter.Profile and internal structure sketch map are referring to Fig. 2.
The first order parallel resonance unit L1 of the high stopband restraining of the present invention microwave if bandpas filter, C1, parallel resonance unit, second level L2, C2, third level parallel resonance unit L3, C3 adopt five layers of folding coupling strip line structure of distributed constant to realize (referring to Fig. 2 and Fig. 3); Wherein every layer of strip line one end is unsettled, other end ground connection.
The first zero is provided with among circuit L12, the C12 between the first order parallel resonance unit of the high stopband restraining of the present invention microwave if bandpas filter and the parallel resonance unit, the second level; The first zero is provided with inductance L 12 in the circuit; Adopt the strip line of distributed constant to realize; The first zero is provided with in the circuit coupling capacitance C12 and adopts space coupling and the realization of distributed constant electric capacity between the first and second two parallel resonance unit between the first parallel resonance unit and the second parallel resonance unit; Between parallel resonance unit, the second level and the third level parallel resonance unit among the second reset circuit L23, the C23; Inductance L 23 in the second reset circuit; Adopt the strip line of distributed constant to realize, between the second parallel resonance unit and the 3rd parallel resonance unit first zero be provided with in the circuit coupling capacitance C23 adopt second and the 3 two parallel resonance unit between space coupling and the realization of distributed constant electric capacity.
The operation principle of the high stopband restraining of the present invention microwave if bandpas filter is following: the broadband microwave of input letter arrives L1 is connected with C1 among first order parallel resonance unit L1, the C1 a end and the end of the first blocking condenser C4 through input port P1 through input inductance L4; End at first order parallel resonance unit L1, C1; In the described broadband microwave signal; The first zero is provided with circuit L12, C12 between near the microwave signal the first parallel resonance unit resonance frequency is through first blocking condenser C4 entering first order parallel resonance unit and parallel resonance unit, the second level; Near all the other non-first parallel resonance unit resonance frequencies microwave signal is through L1 and C1 ground connection among first order parallel resonance unit L1, the C1; Realize first order filtering; The first zero is provided with near the stopband microwave signal (being near the microwave signal first zero frequency) of parallel resonance frequency of circuit L12, C12; Be suppressed because of presenting high impedance; Near the non-first zero microwave frequency signal is provided with the end that L12 and C12 among circuit L12, the C12 arrive the second blocking condenser C5 through the first zero; Arrive the end of coupling capacitance C6 between L2 is connected with C2 among parallel resonance unit, second level L2, the C2 the end and the third level through the second blocking condenser C5; The process first order filtering and the first zero are provided with the microwave signal of circuit; Get into the second reset circuit L23, C23 between parallel resonance unit, the second level and the third level parallel resonance unit near the microwave signal the second parallel resonance unit resonance frequency through coupling capacitance C6 between the third level; Near all the other non-second parallel resonance unit resonance frequencies microwave signal realizes second level filtering through L2 and C2 ground connection among parallel resonance unit, second level L2, the C2, near the stopband microwave signal the parallel resonance frequency of the second reset circuit L23, C23 (i.e. near microwave signal second zero frequency); Be suppressed because of presenting high impedance; Near non-second zero point microwave frequency signal arrives the end of coupling capacitance C7 between the fourth stage through L23 among the second reset circuit L23, the C23 and C23, arrives L3 is connected with C3 among third level parallel resonance unit L3, the C3 a end and the end of outputting inductance L5 through coupling capacitance C7 between the fourth stage, and the microwave signal of the circuit and the second reset circuit is set through first order filtering, second level filtering, the first zero; Near the 3rd parallel resonance unit resonance frequency microwave signal connects the end of 50 ohmage output port P2 of mounted on surface through outputting inductance L5; Near all the other non-the 3rd parallel resonance unit resonance frequencies microwave signal realizes third level filtering through L3 and C3 ground connection among third level parallel resonance unit L3, the C3, and the microwave signal of the circuit and the second reset circuit is set through first order filtering, second level filtering, third level filtering, the first zero; The other end output of 50 ohmage output port P2 through mounted on surface, thus realize that high stopband suppresses microwave midband pass filter function.
The high stopband restraining of the present invention microwave if bandpas filter is owing to be to adopt multilayer LTCC technology to realize; Be that 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.
The photo in kind of high stopband restraining microwave if bandpas filter embodiment and size are referring to Fig. 4, and the main performance test result of high stopband restraining microwave if bandpas filter embodiment is referring to Fig. 5.
Claims (1)
1. one kind high stopband restraining microwave if bandpas filter, 50 ohmage input ports (P1), input inductance (L4), first order parallel resonance unit (L1, C1), first blocking condenser (C4), the first zero that it is characterized in that comprising mounted on surface are provided with between circuit (L12, C12), second blocking condenser (C5), parallel resonance unit, the second level (L2, C2), the third level 50 ohmage output port (P2) and earth terminals of coupling capacitance (C7), third level parallel resonance unit (L3, C3), outputting inductance (L5), mounted on surface between coupling capacitance (C6), the second reset circuit (L23, C23), the fourth stage; First order parallel resonance unit (L1, C1) is formed in parallel by first inductance (L1) and first electric capacity (C1); Parallel resonance unit, the second level (L2, C2) is formed in parallel by second inductance (L2) and second electric capacity (C2); Third level parallel resonance unit (L3, C3) is formed in parallel by the 3rd inductance (L3) and the 3rd electric capacity (C3); The first zero is provided with circuit (L12, C12) and is formed in parallel by first zero inductance (L12) and first zero electric capacity (C12), and the second reset circuit (L23, C23) is formed in parallel by second inductance at zero point (L23) and second minimum capacity (C23); 50 ohmage input ports (P1) termination input signal of mounted on surface; One end of another termination input inductance (L4) of input port (P1); One end of first order parallel resonance unit (L1, C1) is connected with the other end of input inductance (L4) and an end of first blocking condenser (C4) respectively; The other end of first order parallel resonance unit (L1, C1) links to each other with earth terminal; The other end of described first blocking condenser (C4) connects the end that the first zero is provided with circuit (L12, C12); The first zero is provided with an end of coupling capacitance (C5) between another termination second level of circuit (L12, C12); The other end of second blocking condenser (C5) connects an end of coupling capacitance (C6) between an end and the third level of parallel resonance unit, the second level (L2, C2) respectively; The other end ground connection of parallel resonance unit, the second level (L2, C2), the other end of coupling capacitance between the described third level (C6) is connected with the second reset circuit (L23, C23), and one end of coupling capacitance (C7) is connected between the other end of the second reset circuit (L23, C23) and the fourth stage; The other end of coupling capacitance between this fourth stage (C7) connects an end and outputting inductance (L5) end of third level parallel resonance unit (L3, C3) respectively; The other end ground connection of third level parallel resonance unit (L3, C3), the other end of outputting inductance (L5) is connected with an end of output port (P2), the other end output signal of output port (P2); All input ports (P1), input inductance (L4), first order parallel resonance unit (L1, C1), first blocking condenser (C4), the first zero are provided with between circuit (L12, C12), second blocking condenser (C5), parallel resonance unit, the second level (L2, C2), the third level between coupling capacitance (C6), the second reset circuit (L23, C23), the fourth stage coupling capacitance (C7), third level parallel resonance unit (L3, C3), outputting inductance (L5), output port (P2) and earth terminal and all adopt multilayer and realize that with LTCC technology wherein input inductance (L4), outputting inductance (L5), first zero inductance (L12), second inductance at zero point (L23) all adopt the strip line of distributed constant to realize; First, second, third and fourth blocking condenser (C4), (C5), (C6), (C7) adopt media plate electric capacity and distributed constant electric capacity to realize; First order parallel resonance unit (L1, C1), parallel resonance unit, the second level (L2, C2), third level parallel resonance unit (L3, C3) adopt five layers of folding coupling strip line structure of distributed constant to realize that wherein every layer of strip line one end is unsettled, other end ground connection; The first zero is provided with inductance in the circuit (L12); Adopt the strip line of distributed constant to realize; The first zero is provided with in the circuit first zero electric capacity (C12) and adopts space coupling and the realization of distributed constant electric capacity between the first order and two parallel resonance unit, the second level between first order parallel resonance unit and the parallel resonance unit, the second level; Between parallel resonance unit, the second level and the third level parallel resonance unit in the second reset circuit (L23, C23); Inductance (L23) in the second reset circuit; Adopt the strip line of distributed constant to realize, between parallel resonance unit, the second level and the third level parallel resonance unit in the second reset circuit second minimum capacity (C23) adopt space coupling and the realization of distributed constant electric capacity between the second level and two parallel resonance unit of the third level.
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| CN102361436B (en) * | 2011-11-09 | 2015-01-14 | 广东圣大电子有限公司 | High-frequency band filter |
| CN102629858A (en) * | 2012-03-22 | 2012-08-08 | 南京理工大学常熟研究院有限公司 | Ultra-short wave miniature bandpass filter |
| CN102611407A (en) * | 2012-03-22 | 2012-07-25 | 南京理工大学常熟研究院有限公司 | Micro band-pass filter for suppressing Ku-band harmonic waves into millimeter waves |
| CN102571020B (en) * | 2012-03-22 | 2015-01-14 | 南京理工大学常熟研究院有限公司 | P wave band higher-order harmonic suppression micro low pass filter |
| CN103956985A (en) * | 2014-04-22 | 2014-07-30 | 南京理工大学 | Band-pass filter with multi-layer structure |
| CN104506158B (en) * | 2014-12-31 | 2018-05-22 | 深圳市大疆创新科技有限公司 | A kind of analog bandpass filter |
| CN108512519A (en) * | 2018-04-02 | 2018-09-07 | 中国工程物理研究院电子工程研究所 | A kind of bandpass filter chip circuit that highly selective high stop band inhibits |
| CN111525906B (en) * | 2020-03-30 | 2021-11-16 | 北京邮电大学 | N77 and N79 band-pass filter chip based on thin film IPD technology |
| CN112073019A (en) * | 2020-07-31 | 2020-12-11 | 南京邮电大学 | Miniature high-rejection radio frequency on-chip band-pass filter |
| CN111969976B (en) * | 2020-08-12 | 2023-06-30 | 武汉博畅通信设备有限责任公司 | Five-in-one numerical control frequency hopping filter |
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