CN101621147B - 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero - Google Patents
2.4-kilomegahertz miniature band-pass filter with low loss and double-zero Download PDFInfo
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Abstract
The invention discloses a 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero, which comprises a surface-mounted 50-ohm impedance input port, a first-stage parallel resonance unit, a first-stage serial resonance unit, a first inter-stage coupling capacitor, an inter-stage serial coupled inductor, a second inter-stage coupling capacitor, a second-stage parallel resonance unit, a second-stage serial resonance unit, a surface-mounted 50-ohm impedance output port and a ground terminal. The 2.4-kilomegahertz miniature band-pass filter with low loss and double-zero has the advantages of low insertion loss, small volume, light weight, high reliability and the like, and is particularly suitable for Bluetooth transmission, ISM (industry, science and medicine) frequency band transmission, communication of corresponding microwave frequency bands, digital radar and wireless communication handheld terminals, as well as occasions and corresponding systems which are serious to volume, electrical performance, temperature stability and reliability.
Description
Technical field
The present invention relates to a kind of for Bluetooth transmission, ISM (industry, science, medical science) band transmissions, the communication of corresponding microwave frequency band, digital radar, individual soldier's satellite move, the two 0. 2.4 gigahertz minisize band-pass filters of minisize band-pass filter, particularly low-loss of communication terminal, military and civilian multimode and multiplex communication terminal, radio communication handheld terminal etc.
Background technology
Bluetooth technology is a kind of for substituting the cable that uses in stationary electronic devices or the short-distance wireless interconnection technique of line, its equipment use the whole world current, without ISM band of application license, can carry out in real time data and voice transfer.For fear of the interference to image frequency and PCS and GSM channel, in the frequency that filter suppresses at needs, to there be enough decay.In ISM (industry, science, medical science) frequency range, the communication of corresponding microwave frequency band, digital radar, individual soldier's satellite moves, communication terminal, military and civilian multimode and multiplex communication terminal, in radio communication handheld terminal circuit, the two 0. 2.4 gigahertz minisize band-pass filters of low-loss are the crucial electronic units in this wave band reception and transmitting branch, 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 insertion loss, stopband attenuation, form factor, temperature stability, volume, weight, reliability etc.Conventional Design and manufacture method is at microwave S-band (2GHz～4GHz), because wavelength is grown (7.5 centimetres to 15 centimetres of wavelength.), the volume of filter is directly proportional to operation wavelength, so volume is larger.And employing Surface Acoustic Wave Filter technology, although volume can reduce, but its electrical property has temperature drift shortcoming, and cost is high, insertion loss is larger, temperature stability require high, volume requirement is little and insertion loss requires low application scenario to be all very limited.
Summary of the invention
The object of the present invention is to provide that a kind of loss is low, volume is little, lightweight, reliability is high, temperature performance good stability, electrical property is excellent, rate of finished products is high, electrical property consistency is good in batches, cost is low two 0. 2.4 gigahertz minisize band-pass filters of low-loss.
The technical scheme that realizes the object of the invention is: the two 0. 2.4 gigahertz minisize band-pass filters of a kind of low-loss, comprise 50 ohmage output port and the earth terminals that install on Space Coupling electric capacity between 50 ohmage input ports, first order parallel resonance unit, first order series resonance unit, the first blocking condenser, inter-stage series coupled inductance, the second blocking condenser, series resonance unit, the second level, parallel resonance unit, the second level, the first inductance and the 4th inductance of installing on surface, surface; First order parallel resonance unit in parallel and parallel resonance unit, the second level between input port and output port, first order series resonance unit is in parallel with first order parallel resonance unit, series resonance unit, the second level is in parallel with parallel resonance unit, the second level, between first order parallel resonance unit and parallel resonance unit, the second level, connect first order coupling capacitance, inter-stage series coupled inductance and second level coupling capacitance; Difference ground connection in one end of the 3rd inductance in one end of the second inductance and series resonance unit, the second level in one end of one end of first order parallel resonance unit, parallel resonance unit, the second level, first order series resonance unit.
The present invention compared with prior art, owing to having adopted 3 D stereo integrated morphology and multilayer LTCC technology to realize its structure, utilize Space Coupling and Distribution Effect to realize the element in circuit, make its structure very compact, its remarkable advantage has: (1) loss is low, volume is little, lightweight, reliability is high; (2) electrical property is excellent, as: pass band insertion loss is low, reflection loss is little; (3) electrical property temperature stability is high; (4) circuit implementation structure is simple; (5) electrical property consistency is good, can realize production 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 Bluetooth transmission, ISM (industry, science, medical science) band transmissions, rocket, airborne, individual soldier's mobile communication terminal, and volume, weight, performance, reliability are had in the harsh corresponding system requiring.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of the two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention.
Fig. 2 is profile and the internal structure schematic diagram of the two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention.
Fig. 3 is two 0. 2.4 gigahertz minisize band-pass filter " T " the strip line schematic diagrames of low-loss of the present invention.
Fig. 4 is the photo in kind of the embodiment of the two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention.
Fig. 5 is the size schematic diagram of the two 0. 2.4 gigahertz minisize band-pass filter embodiment of low-loss of the present invention.
Fig. 6 is the main electric performance test result of the two 0. 2.4 gigahertz minisize band-pass filter embodiment of low-loss of the present invention.
Embodiment
In conjunction with Fig. 1, Fig. 2, the two 0. 2.4 gigahertz minisize band-pass filters of a kind of low-loss of the present invention, comprise the 50 ohmage input port Port1 that install on surface, first order parallel resonance unit L1, C1, first order series resonance unit C2, L2, the first blocking condenser C5, C6, inter-stage series coupled inductance L 5, the second blocking condenser C7, C8, series resonance unit, second level C3, L3, parallel resonance unit, second level L4, C4, Space Coupling capacitor C 9 between the first inductance L 1 and the 4th inductance L 4, 50 ohmage output port Port2 and the earth terminals that install on surface, first order parallel resonance unit L1 in parallel, C1 and parallel resonance unit, second level L4, C4 between input port Port1 and output port Port2, first order series resonance unit L2, C2 are in parallel with first order parallel resonance unit L1, C1, series resonance unit, second level L3, C3 are in parallel with parallel resonance unit, second level L4, C4, and first order coupling capacitance C5, C6, inter-stage series coupled inductance L 5 and second level coupling capacitance L7, C8 connect between first order parallel resonance unit L1, C1 and parallel resonance unit, second level L4, C4, difference ground connection in one end of the 3rd inductance L 3 in one end of the second inductance L 2 and series resonance unit, second level L3, C3 in one end of one end of first order parallel resonance unit L1, C1, parallel resonance unit, second level L4, C4, first order series resonance unit L2, C2.
The two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention, first order parallel resonance unit L1, C1 is formed in parallel by the first inductance L 1 and the first capacitor C 1, first order series resonance unit L2, C2 is in series by the second inductance L 2 and the second capacitor C 2, the first blocking condenser C5, C6 is formed in parallel by the 5th capacitor C 5 and the 6th capacitor C 6, parallel resonance unit, second level L4, C4 is formed in parallel by the 4th inductance L 4 and the 4th capacitor C 4, series resonance unit, second level L3, C3 is in series by the 3rd inductance L 3 and the 3rd capacitor C 3, the second blocking condenser C7, C8 is formed in parallel by the 7th capacitor C 7 and the 8th capacitor C 8, the first blocking condenser C5, C6, inter-stage series coupled inductance L 5 and the second blocking condenser C7, C8 is the equivalent series resonant tank of realizing filter function in series mutually, the first blocking condenser C5, C6, inter-stage series coupled inductance L 5 and the second blocking condenser C7, C8 connects mutually, with Space Coupling capacitor C 9 formation in parallel equivalent parallel resonant tank between the first inductance L 1 and the 4th inductance L 4.
In conjunction with Fig. 3, the two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention, 50 ohmage input port Port1 of surperficial mounting interface, first order parallel resonance unit L1, C1, first order series resonance unit C2, L2, the first blocking condenser C5, C6, inter-stage series coupled inductance L 5, the second blocking condenser C7, C8, series resonance unit, second level L3, C3, parallel resonance unit, second level L4, C4, Space Coupling capacitor C 9 between the first inductance L 1 and the 4th inductance L 4, 50 ohmage output port Port2 of surface mounting interface and earth terminal all adopt multilayer LTCC technique to realize, wherein first order parallel resonance unit L1, the first inductance L 1 of C1, parallel resonance unit, second level L4, the 4th inductance L 4 of C4 all adopts the strip line of distributed constant to realize, first order parallel resonance unit L1, the first capacitor C 1 of C1, parallel resonance unit, second level L4, the 4th capacitor C 4 of C4 forms ground capacity by media plate and ground plate, four inter-stage electric capacity the 5th capacitor C 5, the 6th capacitor C 6, the 7th capacitor C 7, the 8th capacitor C 8 all adopts media plate electric capacity to realize, and between the first inductance L 1 and the 4th inductance L 4, Space Coupling capacitor C 9 utilizes Space Coupling to realize, first order series resonance unit C2, L2 and series resonance unit, second level C3, L3 is realized by T-shape strip line, wherein one end of one end of the second inductance L 2 and the 3rd inductance L 3 difference ground connection,
The two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention, the second capacitor C 2 and the second inductance L 2 resonance form the first zero, due to symmetrical completely, the 3rd capacitor C 3 and the 3rd inductance L 3 resonance form the zero point with first zero same frequency, the mutual inductance effect of the first inductance L 1 and the 4th inductance L 4 has produced the coupling capacitance C9 that is parallel to inter-stage, the first blocking condenser C5, C6, inter-stage series coupled inductance L 5 and the second blocking condenser C7, C8 connects mutually, formed for the second zero point with Space Coupling capacitor C 9 formation in parallel equivalent parallel resonant tank between the first inductance L 1 and the 4th inductance L 4, the second inductance L 2 and the 3rd inductance L 3 are realized by distributed constant strip line, the second capacitor C 2 and the 3rd capacitor C 3 are realized by media plate electric capacity, first order parallel resonance unit L1, C1, parallel resonance unit, second level L4, C4, the equivalent series resonant tank that the first blocking condenser C5, C6, inter-stage series coupled inductance L 5 and the second blocking condenser C7, C8 series connection form, they form respectively three grades of bandpass filtering unit.
The two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention, its operation principle is summarized as follows: the broadband microwave signal of input arrives first order parallel resonance unit L1 through input port Port1, C1, first order series resonance unit C2, L2, the first blocking condenser C5, C6, at first order parallel resonance unit L1, one end of C1, in described broadband microwave signal, near microwave signal the first parallel resonance unit resonance frequency is passed through, near microwave signal all the other non-first parallel resonance unit resonance frequencies is by first order parallel resonance unit L1, the first inductance L 1 in C1 and the first capacitor C 1 ground connection, realize first order filtering.One end at first order series resonance unit L2, C2, the second inductance L 2 and the second capacitor C 2 form series resonance frequency and form the first zero, make near the microwave signal of series resonance frequency present short circuit and ground connection, near microwave frequency signal non-zero points frequency passes through, and filtering and zero point form and carry out simultaneously.After filtering, the microwave signal of shaping at zero point is through the first blocking condenser C5, C6, inter-stage series coupled inductance L 5, the second blocking condenser C7, C8, due to the 5th capacitor C 5, the 6th capacitor C 6 parallel connections can be equivalent to an electric capacity, the 7th capacitor C 7, the 8th capacitor C 8 parallel connections can be equivalent to another electric capacity, these two equivalent capacitys and inter-stage series coupled inductance L 5 form equivalent series resonant tank and realize second level filter function, the mutual inductance effect of the first inductance L 1 and the 4th inductance L 4 has produced the coupling capacitance C9 that is parallel to inter-stage, the first blocking condenser C5, C6, inter-stage series coupled inductance L 5 and the second blocking condenser C7, C8 connects mutually, form the second reset circuit with Space Coupling capacitor C 9 formation in parallel equivalent parallel resonant tank between L1 and L4, near the microwave signal parallel resonance frequency of the second reset circuit (i.e. near microwave signal the second zero frequency), suppressed because presenting high impedance, near microwave frequency signal non-the second zero point is by the second reset circuit, the zero point that cross-couplings that Here it is forms, through first order filtering, second level filtering, the microwave signal of the first zero and shaping at the second zero point arrives second level parallel resonance L4, C4 and second level series resonance C3, one end of L3, at parallel resonance unit, second level L4, near microwave signal C4 resonance frequency is passed through, near microwave signal all the other non-second level parallel resonance unit resonance frequencies is by parallel resonance unit, second level L4, the 4th inductance L 4 in C4 and the 4th capacitor C 4 ground connection, realize third level filtering, due to reset circuit C2, L2 and C3, L3 full symmetric, so form identical zero point (first zero), through series resonance unit, second level L3, in the microwave signal of C3, near microwave signal series resonance unit resonance frequency (be first zero frequency near microwave signal), because presenting short circuit ground connection, near microwave frequency signal disresonance frequence arrives one end of output port Port2, through first order filtering, second level filtering, third level filtering, the first zero arranges the microwave signal of circuit and the second reset circuit, the other end of the 50 ohmage output port Port2 that install by surface is exported, thereby realize the two 0. 2.4 gigahertz minisize band-pass filters of low-loss.
In conjunction with Fig. 4, Fig. 5, the two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention are owing to being the realization of employing multilayer LTCC technique, that 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 D stereo is integrated to be grounded and to encapsulate with multilayer folding structure and outer surface metallic shield, thereby volume is significantly reduced, the two 0. 2.4 gigahertz minisize band-pass filters of low-loss of the present invention are of a size of 1.6mm * 0.8mm * 0.6mm, weight is less than 0.05 gram.In conjunction with Fig. 6, in its main performance testing results, very little at the Insertion Loss at 2.45GHz place, this Insertion Loss is less than 1dB, and in figure, two zero points are very obvious.
Claims (3)
1. two 0. 2.4 gigahertz minisize band-pass filters of a low-loss, it is characterized in that: comprise the 50 ohmage input ports (Port1) that install on surface, first order parallel resonance unit (L1, C1), first order series resonance unit (C2, L2), the first blocking condenser (C5, C6), inter-stage series coupled inductance (L5), the second blocking condenser (C7, C8), series resonance unit, the second level (C3, L3), parallel resonance unit, the second level (L4, C4), Space Coupling electric capacity (C9) between the first inductance (L1) and the 4th inductance (L4), 50 ohmage output port (Port2) and the earth terminals that install on surface, first order parallel resonance unit (L1 in parallel between input port (Port1) and output port (Port2), C1) and parallel resonance unit, the second level (L4, C4), first order series resonance unit (L2, C2) with first order parallel resonance unit (L1, C1) parallel connection, series resonance unit, the second level (L3, C3) with parallel resonance unit, the second level (L4, C4) parallel connection, first order parallel resonance unit (L1, C1) and parallel resonance unit, the second level (L4, C4) the first blocking condenser (C5 connects between, C6), inter-stage series coupled inductance (L5) and the second blocking condenser (C7, C8), difference ground connection in one end of the 3rd inductance (L3) in one end of the second inductance (L2) and series resonance unit, the second level (L3, C3) in one end of one end of first order parallel resonance unit (L1, C1), parallel resonance unit, the second level (L4, C4), first order series resonance unit (L2, C2), first order parallel resonance unit (L1, C1) by the first inductance (L1) and the first electric capacity (C1), be formed in parallel, first order series resonance unit (L2, C2) by the second inductance (L2) and the second electric capacity (C2), be in series, the first blocking condenser (C5, C6) by the 5th electric capacity (C5) and the 6th electric capacity (C6), be formed in parallel, parallel resonance unit, the second level (L4, C4) by the 4th inductance (L4) and the 4th electric capacity (C4), be formed in parallel, series resonance unit, the second level (L3, C3) by the 3rd inductance (L3) and the 3rd electric capacity (C3), be in series, the second blocking condenser (C7, C8) by the 7th electric capacity (C7) and the 8th electric capacity (C8), be formed in parallel, the first blocking condenser (C5, C6), inter-stage series coupled inductance (L5) and the second blocking condenser (C7, C8) the mutual equivalent series resonant tank of realizing filter function in series, the first blocking condenser (C5, C6), inter-stage series coupled inductance (L5) and the second blocking condenser (C7, C8) series connection mutually, with Space Coupling electric capacity (C9) formation in parallel equivalent parallel resonant tank between the first inductance (L1) and the 4th inductance (L4), 50 ohmage input ports (Port1) of surface mounting interface, first order parallel resonance unit (L1, C1), first order series resonance unit (C2, L2), the first blocking condenser (C5, C6), inter-stage series coupled inductance (L5), the second blocking condenser (C7, C8), series resonance unit, the second level (L3, C3), parallel resonance unit, the second level (L4, C4), Space Coupling electric capacity (C9) between the first inductance (L1) and the 4th inductance (L4), 50 ohmage output ports (Port2) of surface mounting interface and earth terminal all adopt multilayer LTCC technique to realize, wherein first order parallel resonance unit (L1, C1) the first inductance (L1), parallel resonance unit, the second level (L4, C4) the 4th inductance (L4) all adopts the strip line of distributed constant to realize, first order parallel resonance unit (L1, C1) the first electric capacity (C1), parallel resonance unit, the second level (L4, C4) the 4th electric capacity (C4) forms ground capacity by media plate and ground plate, the 5th electric capacity (C5), the 6th electric capacity (C6), the 7th electric capacity (C7), these four inter-stage electric capacity of the 8th electric capacity (C8) all adopt media plate electric capacity to realize, and between the first inductance (L1) and the 4th inductance (L4), Space Coupling electric capacity (C9) utilizes Space Coupling to realize, first order series resonance unit (C2, L2) and series resonance unit, the second level (C3, L3) by T-shape strip line, realized, wherein one end of one end of the second inductance (L2) and the 3rd inductance (L3) difference ground connection.
2. two 0. 2.4 gigahertz minisize band-pass filters of low-loss according to claim 1, it is characterized in that: the second electric capacity (C2) and the second inductance (L2) resonance form the first zero, due to symmetrical completely, the 3rd electric capacity (C3) and the 3rd inductance (L3) resonance form the zero point with first zero same frequency, the mutual inductance effect of the first inductance (L1) and the 4th inductance (L4) has produced the coupling capacitance (C9) that is parallel to inter-stage, the first blocking condenser (C5, C6), inter-stage series coupled inductance (L5) and the second blocking condenser (C7, C8) series connection mutually, formed for the second zero point with Space Coupling electric capacity (C9) formation in parallel equivalent parallel resonant tank between the first inductance (L1) and the 4th inductance (L4), the second inductance (L2) and the 3rd inductance (L3) are realized by distributed constant strip line, the second electric capacity (C2) and the 3rd electric capacity (C3) are realized by media plate electric capacity.
3. two 0. 2.4 gigahertz minisize band-pass filters of low-loss according to claim 1, it is characterized in that: first order parallel resonance unit (L1, C1), parallel resonance unit, the second level (L4, C4), the equivalent series resonant tank that the first blocking condenser (C5, C6), inter-stage series coupled inductance (L5) and the second blocking condenser (C7, C8) series connection form, they form respectively three grades of bandpass filtering unit.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104091983B (en) * | 2014-07-16 | 2016-08-17 | 南京理工大学 | The self-supported I/Q of miniature microwave and millimeter wave variable paraphase orthogonal filter |
| CN104218279B (en) * | 2014-09-02 | 2017-04-19 | 电子科技大学 | Novel dual-mode band-pass filter based on LTCC (low temperature co-fired ceramics) |
| CN107911094A (en) * | 2017-12-11 | 2018-04-13 | 广东黑林通信技术有限公司 | A multifunctional equalizer |
| JP6965733B2 (en) * | 2017-12-26 | 2021-11-10 | Tdk株式会社 | 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 |
| CN111342793B (en) * | 2018-12-18 | 2023-09-26 | 天津大学 | Bandpass filters and methods of improving their suppression levels, duplexers and electronic devices |
| CN111049498A (en) * | 2019-12-26 | 2020-04-21 | 福州瑞芯微电子股份有限公司 | Narrow-band-pass filter circuit and filter |
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