CN102611407A - Micro band-pass filter for suppressing Ku-band harmonic waves into millimeter waves - Google Patents
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Abstract
The invention relates to a micro band-pass filter for suppressing Ku-band harmonic waves into millimeter waves. The micro band-pass filter comprises a 50 omega impedance input/output interface suitable for surface mounting, four parallel resonance units realized by two layers of folded and coupled band-shaped lines, three cascade inductors, one oblique Z-shaped crossed and coupled capacitor as well as an input inductor and an output inductor, wherein the components of the micro band-pass filter are all realized by a multi-layer low-temperature co-fired ceramic process technology. The micro band-pass filter has the advantages of good band-pass selectivity, long out-of-band rejection, small volume, light weight, high reliability, good electric property, good phase frequency characteristic linearity, good temperature stability, good electrical property batch uniformity, low cost, suitability for large-batch production and the like, and is in particular suitable for wireless communication handheld and portable terminal products such as terminals of radar, communication, rocket-borne, airborne, missile-borne, spaceship, one-man mobile communication and the like, and occasions and corresponding frequency band systems with severe requirements on the volume, the electrical property and the reliability and the like.
Description
Technical field
The present invention relates to a kind of filter, particularly a kind of Ku wave band harmonic wave suppresses the minisize band-pass filter to millimeter wave.
Background technology
Development along with systems such as microwave and millimeter wave communication, radars; 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; Ku wave band harmonic wave suppress to the minisize band-pass filter of millimeter wave be this wave band receive and transmitting branch in crucial electronic unit, the quality of its performance often directly influences the performance index of whole communication system.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.Filter is a kind of frequency to be had optionally two-port network, in many microwave systems, is widely used, and utilizes it can separate and make up the signal of different frequency.In order in device miniaturization, to reduce its loss, obtain higher quality factor, just need seek new material and technology.Conventional design and manufacturing approach volume are bigger, and like the filter of metal resonant cavity formation, microstripline filter, lump-shaped media filter etc., volume is too big, can not adapt to the requirement of miniaturization; And adopt SAW filter technological; Though volume can reduce; But its electrical property has the temperature drift shortcoming; And cost is high, it is bigger to insert loss, and can't realize in this technology of Ku wave band, temperature stability require high, cost is low, performance is excellent, volume is little, application scenario in light weight, that reliability is high all is very limited.
Summary of the invention
The object of the present invention is to provide the Ku wave band harmonic wave 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 to suppress minisize band-pass filter to millimeter wave.
The technical scheme that realizes the object of the invention is: a kind of Ku wave band harmonic wave suppresses the minisize band-pass filter to millimeter wave, comprises that 50 ohmage input ports, input inductance, first order parallel resonance unit, the first cascade inductance, parallel resonance unit, the second level, the second cascade inductance, third level parallel resonance unit, the third level of mounted on surface join 50 ohmage output port and earth terminals of inductance, fourth stage parallel resonance unit, cross coupling capacitor, outputting inductance, 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 order parallel resonance unit, the first cascade inductance, cross coupling capacitor, and wherein first order parallel resonance unit is formed in parallel by first inductance and first electric capacity; The other end of the first cascade inductance is connected with the common port of parallel resonance unit, the second level, the second cascade inductance, and parallel resonance unit, the second level is formed in parallel by second inductance and second electric capacity; The other end of the second cascade inductance is connected with the common port that third level parallel resonance unit, the third level join inductance, and third level parallel resonance unit is formed in parallel by the 3rd inductance and the 3rd electric capacity; The other end that the third level joins inductance is connected with the common port of fourth stage parallel resonance unit, cross coupling capacitor, outputting inductance, and fourth stage parallel resonance unit is formed in parallel by the 4th inductance and the 4th electric capacity; 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 order parallel resonance unit, parallel resonance unit, the second level, third level parallel resonance unit and fourth stage parallel resonance unit is ground connection respectively.
The present invention compared with prior art, its remarkable advantage is: (1) the present invention utilizes multilayer LTCC technology (LTCC) characteristics, adopts the stereoscopic multi-layer laminated construction to realize circuit element, reduced volume greatly; (2) utilize the high characteristics of LTCC ceramic dielectric dielectric constant can significantly reduce component size equally; (3) utilize the low-loss characteristics of LTCC material and unique circuit structure to realize excellent electric performance; (4) utilize the high-temperature stability and the reliability of low-temp ceramics material, make element have high-temperature stability and high reliability; (5) utilize the consistency of the production in enormous quantities of LTCC technology, obtain high finished product rate and low cost.In a word; The present invention has that volume is little, in light weight, reliability is high, electrical property is excellent, the electrical property temperature stability is high, the circuit implementation structure is simple, electrical property consistency good; Can install and welding, be specially adapted in the radio communication handheld terminals such as rocket, airborne, missile-borne, spaceship, individual soldier's mobile communication terminal with full-automatic chip mounter, and volume, weight, performance, reliability are had in the harsh corresponding system that requires.
Description of drawings
Fig. 1 is that Ku wave band harmonic wave of the present invention suppresses to the electrical schematic diagram of the minisize band-pass filter of millimeter wave.
Fig. 2 is that Ku wave band harmonic wave of the present invention suppresses to the profile and the internal structure sketch map of the minisize band-pass filter of millimeter wave.
Fig. 3 is that Ku wave band harmonic wave of the present invention suppresses the three-dimensional all-wave simulation performance of the minisize band-pass filter curve to millimeter wave.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
In conjunction with Fig. 1 and Fig. 2; The present invention is that a kind of Ku wave band harmonic wave suppresses the minisize band-pass filter to millimeter wave, and this filter comprises that 50 ohmage input port P1, input inductance Lin, first order parallel resonance unit L1C1, the first cascade inductance L 12, parallel resonance unit, second level L2C2, the second cascade inductance L 23, third level parallel resonance unit L3C3, the third level of mounted on surface join 50 ohmage output port P2 and earth terminals of inductance L 34, fourth stage parallel resonance unit L4C4, cross coupling capacitor C14, outputting inductance Lout, 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 public connecting end of the other end of input inductance Lin and first order parallel resonance unit L1C1, the first cascade inductance L 12, cross coupling capacitor C14 is connected, and wherein first order parallel resonance unit L1C1 is formed in parallel by first inductance L 1 and first capacitor C 1; The other end of the first cascade inductance L 12 is connected with the common port of parallel resonance unit, second level L2C2, the second cascade inductance L 23, and parallel resonance unit, second level L2C2 is formed in parallel by second inductance L 2 and second capacitor C 2; The other end of the second cascade inductance L 23 is connected with the common port that third level parallel resonance unit L3C3, the third level join inductance L 34, and third level parallel resonance unit L3C3 is formed in parallel by the 3rd inductance L 3 and the 3rd capacitor C 3; The other end that the third level joins inductance L 34 is connected with the common port of fourth stage parallel resonance unit L4C4, cross coupling capacitor C14, outputting inductance Lout, and fourth stage parallel resonance unit L4C4 is formed in parallel by the 4th inductance L 4 and the 4th capacitor C 4; 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 first order parallel resonance unit L1C1, parallel resonance unit, second level L2C2, third level parallel resonance unit L3C3 and fourth stage parallel resonance unit L4C4 is ground connection respectively.
In conjunction with Fig. 2; Ku wave band harmonic wave of the present invention suppresses the minisize band-pass filter to millimeter wave; Input port P1, input inductance Lin, first order parallel resonance unit L1C1, the first cascade inductance L 12, parallel resonance unit, second level L2C2, the second cascade inductance L 23, third level parallel resonance unit L3C3, the third level join inductance L 34, fourth stage parallel resonance unit L4C4, cross coupling capacitor C14, outputting inductance Lout, output port P2 and earth terminal and all adopt multilayer LTCC technology to realize; Wherein input inductance Lin, outputting inductance Lout all adopt the strip line of distributed constant to realize; First order parallel resonance unit L1C1, parallel resonance unit, second level L2C2, third level parallel resonance unit L3C3, fourth stage parallel resonance unit L4C4 all adopt two-layer folding coupling strip line to realize; The first cascade inductance L 12, the second cascade inductance L 23, the third level join that inductance L 34 adopts between first order parallel resonance unit L1C1 and parallel resonance unit, the second level L2C2 respectively, space coupling and distributed constant inductance realize that the space is coupled and the realization of distributed constant electric capacity between cross coupling capacitor C14 employing first order parallel resonance unit L1C1 and the fourth stage parallel resonance unit L4C4 between second level parallel resonance unit L2C2 and the third level parallel resonance unit L3C3, between third level parallel resonance unit L3C3 and the fourth stage parallel resonance unit L4C4.
In conjunction with Fig. 2; Ku wave band harmonic wave of the present invention suppresses the minisize band-pass filter to millimeter wave; First order parallel resonance unit L1C1, parallel resonance unit, second level L2C2, third level parallel resonance unit L3C3, fourth stage parallel resonance unit L4C4 all adopt the two-layer folding coupling strip line structure of distributed constant to realize; Wherein every layer of strip line one end is unsettled, other end ground connection.Cross coupling capacitor C14 adopts space coupling and the realization of distributed constant electric capacity, wherein two ends difference ground connection between first order parallel resonance unit L1C1 and fourth stage parallel resonance unit L4C4 and the oblique zigzag cross-couplings strip line.
Ku wave band harmonic wave of the present invention suppresses the minisize band-pass filter to millimeter wave; Its operation principle is summarized as follows: the broadband microwave signal of input; Arrive the common port of inductance L 12, cross coupling capacitor C14 between first order parallel resonance unit L1C1, the first order through input inductance Lin through input port P1; Get into inductance L 12 between the first order near the microwave signal the first order parallel resonance unit L1C1 resonance frequency; Near all the other non-first order parallel resonance unit L1C1 resonance frequencys microwave signal realizes first order filtering through first inductance L 1 and first capacitor C, 1 ground connection among the first order parallel resonance unit L1C1; Filtered microwave signal is through inductance L 12 arrival second level parallel resonance unit L2C2 between the first order; Near parallel resonance unit, second level L2C2 resonance frequency microwave signal gets between the second level in the inductance L 23; Near all the other parallel resonance unit, non-second level L2C2 resonance frequencys microwave signal realizes second level filtering through second inductance L 2 and second capacitor C, 2 ground connection among parallel resonance unit, the second level L2C2; The microwave signal of inductance L 23 between coupling inductance L12, second level filtering, the second level between the filtering of the process first order, the first order; Near third level parallel resonance unit L3C3 resonance frequency microwave signal gets between the third level in the inductance L 34; Near all the other non-third level parallel resonance unit L3C3 resonance frequencys microwave signal realizes third level filtering through the 3rd inductance L 3 and the 3rd capacitor C 3 ground connection among the third level parallel resonance unit L3C3; Because the mutual inductance effect of first inductance L 1 and the 4th inductance L 4 has produced the cross coupling capacitor C14 that is parallel to inter-stage; Between the first order between inductance L 12, the second level between inductance L 23 and the third level inductance L 34 connect each other; With the parallelly connected formation of cross coupling capacitor C14 equivalent parallel resonant tank between first inductance L 1 and the 4th inductance L 4; Near this parallel resonance frequency microwave signal; Be suppressed because of presenting high impedance; Near non-this parallel resonance frequency microwave frequency signal arrives fourth stage parallel resonance unit L4C4, and at the zero point that cross-couplings that Here it is forms, near the microwave signal fourth stage parallel resonance unit L4C4 resonance frequency connects the end of 50 ohmage output port P2 of mounted on surface through outputting inductance Lout; Near all the other non-fourth stage parallel resonance unit L4C4 resonance frequencys microwave signal realizes fourth stage filtering through the 4th inductance L 4 and the 4th capacitor C 4 ground connection among the fourth stage parallel resonance unit L4C4; Through the broadband microwave signal of inductance L 34, cross coupling capacitor C14 between inductance L 23, the third level between inductance L 12, the second level between first order filtering, second level filtering, third level filtering, fourth stage filtering, the first order; The other end output of 50 ohmage output port P2 through mounted on surface, thus realize that Ku wave band harmonic wave suppresses the minisize band-pass filter function to millimeter wave.
Ku wave band harmonic wave suppresses to the minisize band-pass filter of millimeter wave 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 2.0mm * 1.1mm * 0.7mm that Ku wave band harmonic wave suppresses to implement volume to the minisize band-pass filter of millimeter wave.This filter bandwidht is 200MHz, and the logical in-band insertion loss of simulation filter device is all less than 2 decibels, is superior to-20 decibels from the inhibition of 15.5GHz to 35GHz, has good performance of filter.
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Claims (3)
1. a Ku wave band harmonic wave suppresses the minisize band-pass filter to millimeter wave; It is characterized in that: the 50 ohmage input ports (P1), input inductance (Lin), the first order parallel resonance unit (L1 that comprise mounted on surface; C1), the first cascade inductance (L12), parallel resonance unit, the second level (L2; C2), the second cascade inductance (L23), third level parallel resonance unit (L3; C3), the third level join inductance (L34), fourth stage parallel resonance unit (L4, C4), 50 ohmage output port (P2) and earth terminals of cross coupling capacitor (C14), outputting inductance (Lout), 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) and first order parallel resonance unit (L1; C1), the public connecting end of the first cascade inductance (L12), cross coupling capacitor (C14) is connected, wherein (L1 C1) is formed in parallel by first inductance (L1) and first electric capacity (C1) in first order parallel resonance unit; The other end of the first cascade inductance (L12) and parallel resonance unit, the second level (L2, C2), the common port of the second cascade inductance (L23) is connected, (L2's parallel resonance unit, the second level C2) is formed in parallel by second inductance (L2) and second electric capacity (C2); The other end of the second cascade inductance (L23) and third level parallel resonance unit (L3; C3), the common port of third level couplet inductance (L34) is connected; (L3 C3) is formed in parallel by the 3rd inductance (L3) and the 3rd electric capacity (C3) in third level parallel resonance unit; The third level joins the other end and the fourth stage parallel resonance unit (L4 of inductance (L34); C4), the common port of cross coupling capacitor (C14), outputting inductance (Lout) is connected; (L4 C4) is formed in parallel by the 4th inductance (L4) and the 4th electric capacity (C4) in fourth stage parallel resonance unit; The other end of outputting inductance (Lout) is connected with an end of output port (P2), another termination output signal of output port (P2); First order parallel resonance unit (L1, C1), parallel resonance unit, the second level (L2, C2), (L3, C3) (L4, C4) the other end is ground connection respectively with fourth stage parallel resonance unit in third level parallel resonance unit.
2. Ku wave band harmonic wave according to claim 1 suppresses the minisize band-pass filter to millimeter wave; It is characterized in that: input port (P1), input inductance (Lin), first order parallel resonance unit (L1, C1), the first cascade inductance (L12), parallel resonance unit, the second level (L2, C2), the second cascade inductance (L23), third level parallel resonance unit (L3; C3), the third level joins inductance (L34), fourth stage parallel resonance unit (L4; C4), cross coupling capacitor (C14), outputting inductance (Lout), output port (P2) and earth terminal all adopt multilayer LTCC technology to realize, wherein input inductance (Lin), outputting inductance (Lout) all adopt the strip line of distributed constant to realize first order parallel resonance unit (L1; C1), second level parallel resonance unit (L2; C2), third level parallel resonance unit (L3, C3), (L4 C4) all adopts two-layer folding coupling strip line to realize in fourth stage parallel resonance unit; The first cascade inductance (L12), the second cascade inductance (L23), the third level join inductance (L34) and adopt first order parallel resonance unit (L1 respectively; C1) with parallel resonance unit, the second level (L2, C2) between, parallel resonance unit, the second level (L2, C2) with third level parallel resonance unit (L3; C3) between, third level parallel resonance unit (L3; C3) with fourth stage parallel resonance unit (L4, C4) between space coupling realize cross coupling capacitor (C14) employing first order parallel resonance unit (L1 with the distributed constant inductance; C1) with fourth stage parallel resonance unit (L4, C4) between space coupling and the realization of distributed constant electric capacity.
3. suppress minisize band-pass filter according to the desired Ku wave band of claim 1 harmonic wave to millimeter wave; It is characterized in that: first order parallel resonance unit (L1, C1), parallel resonance unit, the second level (L2, C2), third level parallel resonance unit (L3; C3), fourth stage parallel resonance unit (L4; C4) all adopt the two-layer 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; Cross coupling capacitor (C14) adopts first order parallel resonance unit, and (L1, C1) (L4 is C4) with tiltedly space coupling and the realization of distributed constant electric capacity, wherein two ends difference ground connection between the zigzag cross-couplings strip line with fourth stage parallel resonance unit.
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Cited By (10)
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| CN103117428A (en) * | 2013-02-05 | 2013-05-22 | 江苏奕扬电子科技股份有限公司 | Miniature band-pass filter of 60G millimeter waves |
| CN103236573A (en) * | 2013-02-05 | 2013-08-07 | 江苏奕扬电子科技股份有限公司 | S-band multi-zero low-insertion-loss micro cavity filter |
| CN103247840A (en) * | 2013-05-13 | 2013-08-14 | 南京理工大学 | Millimeter-wave high-performance filter with micro-scale medium cavity |
| CN103414448A (en) * | 2013-08-01 | 2013-11-27 | 南京理工大学 | Micro band-pass balanced filter |
| CN106230395A (en) * | 2016-08-28 | 2016-12-14 | 戴永胜 | A kind of height suppression UHF waveband low noise amplifier module |
| CN106330124A (en) * | 2016-08-28 | 2017-01-11 | 戴永胜 | Symmetrical distributed inductance load type filter |
| CN112187209A (en) * | 2020-10-23 | 2021-01-05 | 嘉兴佳利电子有限公司 | Ultra-wide passband five-order bandpass filter based on LTCC process |
| CN112367057A (en) * | 2020-11-09 | 2021-02-12 | 中国科学院微电子研究所 | Frequency hopping filter with composite structure and adjusting method thereof |
| CN114497936A (en) * | 2022-03-04 | 2022-05-13 | 南通大学 | A lumped element differential wideband bandpass filter |
| WO2024120089A1 (en) * | 2022-12-07 | 2024-06-13 | 安徽安努奇科技有限公司 | Filter circuit and filter device |
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| CN112187209A (en) * | 2020-10-23 | 2021-01-05 | 嘉兴佳利电子有限公司 | Ultra-wide passband five-order bandpass filter based on LTCC process |
| CN112367057A (en) * | 2020-11-09 | 2021-02-12 | 中国科学院微电子研究所 | Frequency hopping filter with composite structure and adjusting method thereof |
| CN114497936A (en) * | 2022-03-04 | 2022-05-13 | 南通大学 | A lumped element differential wideband bandpass filter |
| WO2024120089A1 (en) * | 2022-12-07 | 2024-06-13 | 安徽安努奇科技有限公司 | Filter circuit and filter device |
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Application publication date: 20120725 |