CN101640519A - High stop-band inhibiting multi-zero 2.4 GHz mini filter - Google Patents
High stop-band inhibiting multi-zero 2.4 GHz mini filter Download PDFInfo
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- CN101640519A CN101640519A CN200910034206A CN200910034206A CN101640519A CN 101640519 A CN101640519 A CN 101640519A CN 200910034206 A CN200910034206 A CN 200910034206A CN 200910034206 A CN200910034206 A CN 200910034206A CN 101640519 A CN101640519 A CN 101640519A
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Abstract
The invention relates to a high stop-band inhibiting multi-zero 2.4 GHz mini filter, comprising an input/output interface arranged on the surface, two parallel-resonance units, an interstage couplingelectric capacity and an inductance and two sets of zero set circuits; and all the parts are produced by low temperature co-fired ceramic technology. The mini filter has the advantages of small volume, light weight, high reliability, excellent electric property, linear change of phase frequency character, good temperature stability, excellent consistency of electric property indicator batch, low cost for multitudinous production and the like, especially applicable to Bluetooth transmission, industry, science and medication (ISM) frequency range transmission, corresponding microwave frequency range communication, digital radar, single soldier satellite movement, communication terminals, military and civil multimode and multipath communication system terminals, wireless communication hand-hold terminals and other corresponding systems with strict requirements on volume, weight, property and reliability.
Description
Technical field
The present invention relates to the communications field, relate in particular to the little shape directional coupler of the pattern-band third octave that is used for the communications field.
Background technology
Bluetooth technology is a kind of be used for the substituting cable that uses on portable or the stationary electronic devices or short-distance wireless interconnection technique of line, its equipment use the whole world current, need not to apply for ISM (industry, science, the medical science) frequency range of permitting, can carry out data and voice transfer in real time.Since 1998, companies such as Nokia proposed since the Bluetooth technology, and Bluetooth technology obtains very big development, the fashionable whole world in short 2 years.According to statistics, existing 2000 many enterprises had been engaged in the research and development of Bluetooth technology by 2002, and products such as the Bluetooth chip that released one after another, Bluetooth protocol, application program, testing equipment.Bluetooth technology not only comprises Bluetooth chip, also must use transceiver module.The commerce of bluetooth module is used, and except cost factor, also has two technical problems aborning: the one, and the miniaturization of module; The 2nd, how to realize comprising the optimal design of passive device.On these two problems, the LTCC technology has shown huge superiority.In Bluetooth technology, LTCC is mainly used in passive devices such as preparation filter, antenna, and as built-in substrate.For fear of the interference to image frequency and PCS and GSM channel, filter will have 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, radio communication handheld terminal etc., the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs 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: the passband operating frequency range, the stop-band frequency scope, passband input/output voltage standing-wave ratio, passband inserts loss, stopband attenuation, form factor, temperature stability, volume, weight, reliability etc.(2GHz～4GHz) is because wavelength is grown (7.5 centimetres～15 centimetres of wavelength in the microwave S-band for conventional design and manufacture method.), the volume of filter is directly proportional with operation wavelength, so volume is bigger.And adopt the Surface Acoustic Wave Filter technology, though volume can reduce, its electrical property has the temperature drift shortcoming, and the cost height, to insert loss bigger, requires high and insert loss to require low application scenario all to be very limited in temperature stability.
Summary of the invention
The object of the present invention is to provide that loss is low, volume is little, in light weight, reliability is high, the temperature stabilization performance is good, electrical property is excellent, rate of finished products is high, electrical property consistency is good, cost is low in batches the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs.
The technical scheme that realizes the object of the invention is: the little mode filter of a kind of high stop band and multi-zero suppression 2.4 gigahertzs, 50 ohmage input ports, the first order first zero that comprises mounted on surface are provided with 50 ohmage output port and the earth terminals that circuit, the second level first zero are provided with coupling inductance, second blocking condenser, parallel resonance unit, the second level, mounted on surface between circuit, first order parallel resonance unit, the first order second reset circuit, the second level second reset circuit, first blocking condenser, the first order; The input port and the first order first zero are provided with circuit and join, the output port and the second level first zero are provided with circuit and join, the first order first zero is provided with circuit and with the second level first zero first order parallel resonance in parallel unit between the circuit is set, parallel resonance unit, the second level, the first order second reset circuit is in parallel with first order parallel resonance unit, the second level second reset circuit is in parallel with parallel resonance unit, the second level, first blocking condenser of between first order parallel resonance unit and parallel resonance unit, the second level, connecting, second blocking condenser is in the coupling inductance between the first order of connecting between first blocking condenser and second blocking condenser; First order parallel resonance unit and the first order second reset circuit, first electric capacity, one termination the 3rd electric capacity of first inductance and the 5th electric capacity, the common port that the 3rd inductance is connected with first blocking condenser, first electric capacity, the first inductance other end ground connection, one end of another termination the 5th inductance of the 5th electric capacity, the other end ground connection of the 5th inductance, parallel resonance unit, the second level and the second level second reset circuit, second electric capacity wherein, one termination the 4th electric capacity of second inductance and the 6th electric capacity, the common port that the 4th inductance is connected with second blocking condenser, second electric capacity, the second inductance other end ground connection, one end of another termination the 6th inductance of the 6th electric capacity, the other end ground connection of the 6th inductance.
The present invention compared with prior art, owing to adopted three-dimensional integrated morphology based on the multilayer LTCC, then can utilize the space coupling and the Distribution Effect of given shape to realize required inductance and electric capacity in the circuit, as "T"-shaped stub and via hole inductance etc., then make its compact conformation, then its remarkable advantage is: (1) loss is low, volume is little, in light weight, reliability is high; (2) electrical property excellence (as: the passband Insertion Loss is low, reflection loss is little); (3) electrical property temperature stability height; (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 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 that requires.
Description of drawings
Fig. 1 is the electrical schematic diagram of the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention.
Fig. 2 is the profile and the internal structure schematic diagram of the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention.
Fig. 3 is each layer structural representation of the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention.
Fig. 4 is " T " stub schematic diagram of the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention.
Fig. 5 is the photo in kind of the embodiment of the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention.
Fig. 6 is the size schematic diagram of the embodiment of the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention.
Fig. 7 is the main performance test result of the little mode filter embodiment of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
In conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4, the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention, the 50 ohmage input port Port1 that comprise mounted on surface, the first order first zero is provided with circuit L3, C3, the second level first zero is provided with circuit L4, C4, first order parallel resonance unit L1, C1, the first order second reset circuit L5, C5, the second level second reset circuit L6, C6, the first blocking condenser C12-1, coupling inductance L12 between the first order, the second blocking condenser C12-2, parallel resonance unit, second level L2, C2,50 ohmage output port Port2 and earth terminals of mounted on surface; The input port Port1 and the first order first zero are provided with circuit L3, C3 and join, the output port Port2 and the second level first zero are provided with circuit L4, C4 joins, and the first order first zero is provided with circuit L3, C3 and with the second level first zero first order parallel resonance unit L1 in parallel, C1 between circuit L4, the C4 is set; Parallel resonance unit, second level L2, C2, the first order second reset circuit L5, C5 are in parallel with first order parallel resonance unit L1, C1, the second level second reset circuit L6, C6 are in parallel with parallel resonance unit, second level L2, C2, connect between first order parallel resonance unit L1, C1 and parallel resonance unit, second level L2, the C2 first blocking condenser C12-1, the second blocking condenser C12-2 are at coupling inductance L12 between the series connection first order between the first blocking condenser C12-1 and the second blocking condenser C12-2; First order parallel resonance unit L1, C1 and the first order second reset circuit L5, C5, first capacitor C 1, one termination the 3rd capacitor C 3 of first inductance L 1 and the 5th capacitor C 5, the common port that the 3rd inductance L 3 is connected with the first blocking condenser C12-1, first capacitor C 1, first inductance L, 1 other end ground connection, one end of another termination the 5th inductance L 5 of the 5th capacitor C 5, the other end ground connection of the 5th inductance L 5, parallel resonance unit, second level L2, C2 and the second level second reset circuit L6, C6, second capacitor C 2 wherein, one termination the 4th capacitor C 4 of second inductance L 2 and the 6th capacitor C 6, the common port that the 4th inductance L 4 is connected with the second blocking condenser C12-2, second capacitor C 2, second inductance L, 2 other end ground connection, one end of another termination the 6th inductance L 6 of the 6th capacitor C 6, the other end ground connection of the 6th inductance L 6.
In the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention, 50 ohmage input port Port1, the one termination input signal of mounted on surface, the first zero is provided with circuit and by the first order first zero circuit L3 is set, the C3 and the second level first zero are provided with circuit L4, C4 forms, the first order first zero is provided with circuit L3, the C3 and the second level first zero are provided with circuit L4, C4 is two groups of parallel resonance unit, it is the first zero that their resonance forms identical zero point, and the first order first zero is provided with circuit L3, C3 is formed in parallel by first order first zero inductance L 3 and first order first zero capacitor C 3; The second level first zero is provided with circuit L4, C4 is formed in parallel by second level first zero inductance L 4 and second level first zero capacitor C 4, another termination first order first zero of input port Port1 is provided with circuit L3, the end that C3 is connected, first order parallel resonance unit L1, C1 is formed in parallel by first inductance L 1 and first capacitor C 1, the second reset circuit is by the first order second reset circuit L5, C5 and the second level second reset circuit L6, C6 forms, the first order second reset circuit L5, C5 and the second level second reset circuit L6, C6 is two groups of series resonance unit, it was second zero point that their resonance forms identical zero point, the first order second reset circuit L5, C5 is in series by first order inductance L 5 at second zero point and the first order second minimum capacity C5, the second level second reset circuit L6, C6 is in series by second level inductance L 6 at second zero point and second level inductance C6 at second zero point, the first order first zero is provided with circuit L3, the other end that first order first zero inductance L 3 among the C3 is connected with first order first zero capacitor C 3 respectively with first order parallel resonance unit L1, the end of the end that C1 is connected and the first blocking condenser C12-1 and the first order second reset circuit L5, one end of second minimum capacity 3 the 5th capacitor C 5 among the C5 is connected, first order parallel resonance unit L1, the other end that first inductance L 1 among the C1 is connected with first capacitor C 1 and the first order second reset circuit L5, one end of the first order inductance L at second zero point 5 among the C5 is connected and links to each other with earth terminal, the end of coupling inductance L12 between another termination first order of the first blocking condenser C12-1, the end of coupling capacitance C12-2 between another termination second level of coupling inductance L12 between the first order, parallel resonance unit, second level L2, C2 is formed in parallel by second inductance L 2 and second capacitor C 2, the other end of the second blocking condenser C12-2 respectively with parallel resonance unit, second level L2, end that second inductance L 2 among the C2 is connected with second capacitor C 2 and the second level second reset circuit L6, an end and the second level first zero of the second level second minimum capacity C6 are provided with circuit L4 among the C6, the end that C4 is connected connects, parallel resonance unit, second level L2, the other end that second inductance L 2 among the C2 is connected with second capacitor C 2 and the second level second reset circuit L6, one end of the second level inductance L at second zero point 6 among the C6 is connected and links to each other with earth terminal, the second level first zero is provided with circuit L4, the other end that second level first zero inductance L 4 among the C4 is connected with second level first zero capacitor C 4 is connected the end of 50 ohmage output port Port2 of mounted on surface, another termination output signal of output port Port2.
In the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention, 50 ohmage input port Port1 of all mounted on surface, the first order first zero is provided with circuit L3, C3, the second level first zero is provided with circuit L4, C4, the first order second reset circuit L5, C5, the second level second reset circuit L6, C6, first order parallel resonance unit L1, C1, parallel resonance unit, second level L2, C2, the first blocking condenser C12-1, coupling inductance L12 between the first order, the second blocking condenser C12-2,50 ohmage output port Port2 of mounted on surface and earth terminal all adopt multilayer LTCC technology to realize, the first order first zero is provided with circuit L3, C3, the second level first zero is provided with circuit L4, C4 is formed by the coupling of input and output side, first order parallel resonance unit L1, first inductance L 1 of C1, parallel resonance unit, second level L2, second inductance L 2 of C2 is made of together the earth connection in the via structure of eight layers of made of the second layer to the and the 8th layer, first order parallel resonance unit L1, first electricity (the C1 of C1, parallel resonance unit, second level L2, second capacitor C 2 of C2 is formed by the dielectric-slab of signals layer and the ground plate coupling of ground plane, the first blocking condenser C12-1, the second blocking condenser C12-2 is formed by the dielectric-slab of signals layer and the coupling between capacitor layers, coupling inductance L12 is formed by the strip line of capacitor layers between the first order, the first order second reset circuit L5, C5, the second level second reset circuit L6, C6 is realized by "T"-shaped stub; The first order second minimum capacity C5 among the first order second reset circuit L5, the C5 realizes by first inductance L 1 coupling of an arm and top, and 5 of the 5th inductance L are realized by distributed constant own; The second level second minimum capacity C6 among the second level second reset circuit L6, the C6 realizes by second inductance L 2 coupling of another arm and top, and 6 of second level inductance L at second zero point realize "T"-shaped stub one end ground connection by distributed constant own.The profile of the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention and internal structure schematic diagram are referring to Fig. 5.
In the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention, being provided with of circuit at zero point, adopted two groups of resonant elements to form the design at same zero point, wherein first order first zero inductance L 3 and first order first zero capacitor C 3 are parallel resonance unit, second level first zero inductance L 4 and second level first zero capacitor C 4 also are parallel resonance unit, each self-resonance of these two parallel resonance unit forms zero point, what but these two parallel resonance unit formed is same zero point in fact, be first zero 1.73GHz, same reason, first order inductance L 5 at second zero point and the first order second minimum capacity C5 are series resonance unit, second level inductance L 6 at second zero point and the second level second minimum capacity C6 also are series resonance unit, each self-resonance of these two series resonance unit forms zero point, what but these two series resonance unit formed is same zero point in fact, promptly second zero point 7.11GHz, why taking this design is in order to add overdamp at stopband, adding feasible decay at zero point in certain frequency on the stopband descends, produce identical zero point in same frequency again, make that then the decay slippage is more big, can obviously improve the performance of filter like this.
In the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention, form the 5th inductance L 5 at second zero point, the 5th capacitor C 5, the 6th inductance L 6, the 6th capacitor C 6 is to be realized by "T"-shaped stub, the first order second reset circuit L5, the first order second minimum capacity C5 among the C5 is realized by first inductance L, 1 coupling of an arm and top, 5 of first order inductance L at second zero point are realized by distributed constant own, the second level second reset circuit L6, the second level second minimum capacity C6 among the C6 realizes by second inductance L 2 coupling of another arm and top, and 6 of second level inductance L at second zero point are realized by distributed constant own.Compared with other methods for designing, the employing of "T"-shaped stub greatly reduces the complexity of structure like this, has also reduced size simultaneously.
In the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention, second inductance L 2 among first inductance L 1 among first order parallel resonance unit L1, the C1, parallel resonance unit, second level L2, the C2 is made of together the earth connection in the via structure of eight layers of made of the second layer to the and the 8th layer, adopts the stray inductance of through hole to realize substituting the plane wire-wound inductor.This method has made full use of the advantage of LTCC three-dimensional circuit, and makes miniaturization become possibility.But, this method also has certain defective, is exactly that inductance value is difficult to accurate control.But our influence that studies show that inductance is little more than the influence of electric capacity.Therefore, one of design has circuit than low sensitivity to overcome this shortcoming of inductance value inaccuracy to inductance value can to realize.
The operation principle of the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention is summarized as follows: the broadband microwave signal of input arrives the first order first zero through input port Port1 circuit L3 is set, C3, in the first order first zero circuit L3 is set, the end of C3, in the described broadband microwave signal, in the first order first zero circuit L3 is set, the C3 resonance frequency is near the stopband microwave signal the first zero frequency, be suppressed because of presenting high impedance, near the non-first zero frequency microwave signal is provided with circuit L3 by the first order first zero, C3 arrives first order parallel resonance unit L1, C1, the first order second reset circuit L5, C5, the first blocking condenser C12-1, the microwave signal of process first zero shaping is at first order parallel resonance unit L1, the end of C1, at first order parallel resonance unit L1, near the C1 resonance frequency microwave signal is passed through, all the other non-first order parallel resonance unit L1, near the C1 resonance frequency microwave signal is by first order parallel resonance unit L1, C1 ground connection is realized first order filtering.Simultaneously, end at the first order second reset circuit L5, C5, because first order inductance L at second zero point 5, it was second zero point that the first order second minimum capacity C5 series resonance forms zero point, make near the microwave signal of second zero frequency present short circuit and ground connection, near the microwave signal non-second zero frequency is passed through.Like this, through first zero shaping, first order filtering, the microwave signal of shaping at second zero point is by the first blocking condenser C12-1, coupling inductance L12 between the first order, the second blocking condenser C12-2 arrives parallel resonance unit, second level L2, C2, the second level second reset circuit L6, C6, the second level first zero is provided with circuit L4, C4, at parallel resonance unit, second level L2, the end of C2, the second parallel resonance unit L2, near the C2 resonance frequency microwave signal is passed through, all the other non-second parallel resonance unit L2, near the C2 resonance frequency microwave signal is by parallel resonance unit, second level L2, C2 ground connection is realized second level filtering.Simultaneously, the end of the second reset circuit L6, C6 in the second level, because second level inductance L at second zero point 6, first order inductance L at second zero point 5 among the second level second minimum capacity C6 series resonance formation and before the first order second reset circuit L5, the C5, be second zero point the same zero point at the zero point that the first order second minimum capacity C5 resonance forms, make near the microwave signal of second zero frequency present short circuit and ground connection, near the microwave frequency signal non-second zero frequency passes through.Like this, through first zero shaping, first order filtering, shaping at second zero point, second level filtering, the microwave signal of shaping at second zero point arrives the second level first zero circuit L4 is set once more, C4, second level first zero inductance L 4 wherein, second level first zero capacitor C 4 parallel resonances form and the first order first zero before is provided with circuit L3, first order first zero inductance L 3 among the C3, be the first zero the same zero point at zero point that first order first zero capacitor C 3 parallel resonances form, in the second level first zero circuit L4 is set, the end of C4, in the second level first zero circuit L4 is set, the C4 resonance frequency is near the stopband microwave signal first zero frequency, be suppressed because of presenting high impedance, near the microwave signal the non-first zero frequency arrives the end of 50 ohmage output port Port2 of mounted on surface.Like this, through first zero shaping, first order filtering, shaping at second zero point, second level filtering, shaping at second zero point once more, the microwave signal of first zero shaping is exported from the other end of Port2 once more, thereby realizes the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention.
The little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention 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, because structure adopts "T"-shaped stub and substitutes the plane wire-wound inductor and the outer surface metallic shield is grounded and encapsulates with the stray inductance of through hole, thereby volume is significantly reduced.Up to now, this is in the filter of the employing medium with low dielectric constant like this (27) known to us, the volume minimum, and also very outstanding of performance, satisfied the performance requirement of bluetooth transceiver module fully.
The photo in kind of the little mode filter embodiment of high stop band and multi-zero suppression 2.4 gigahertzs of the present invention and size are referring to Fig. 5, and its size (length * wide * height) is: 1.6mm * 0.8mm * 0.6mm, weight is less than 0.05 gram.Its main performance test result is referring to Fig. 6.Test result shows, at 2.4GHz, and 2.45GHz, 2.5GHz the insertion loss value of locating to record is respectively 1.56dB, 1.65dB, 2.14dB, and have two zero points at 1.7GHz and 7.1GHz place, pad value has all reached respectively more than the 22dB, satisfies system's instructions for use fully.
Claims (5)
1, the little mode filter of a kind of high stop band and multi-zero suppression 2.4 gigahertzs is characterized in that: the 50 ohmage input ports (Port1) that comprise mounted on surface, the first order first zero is provided with circuit (L3, C3), the second level first zero is provided with circuit (L4, C4), first order parallel resonance unit (L1, C1), the first order second reset circuit (L5, C5), the second level second reset circuit (L6, C6), first blocking condenser (C12-1), coupling inductance between the first order (L12), second blocking condenser (C12-2), parallel resonance unit, the second level (L2, C2), 50 ohmage output port (Port2) and earth terminals of mounted on surface; Input port (Port1) is provided with circuit (L3 with the first order first zero, C3) join, output port (Port2) is provided with circuit (L4 with the second level first zero, C4) join, the first order first zero is provided with circuit (L3, C3) with the second level first zero circuit (L4 is set, C4) first order parallel resonance unit (L1 in parallel between, C1), parallel resonance unit, the second level (L2, C2), the first order second reset circuit (L5, C5) with first order parallel resonance unit (L1, C1) parallel connection, the second level second reset circuit (L6, C6) with parallel resonance unit, the second level (L2, C2) parallel connection, at first order parallel resonance unit (L1, C1) with parallel resonance unit, the second level (L2, C2) series connection first blocking condenser (C12-1) between, second blocking condenser (C12-2) is in the coupling inductance (L12) between the first order of connecting between first blocking condenser (C12-1) and second blocking condenser (C12-2); First order parallel resonance unit (L1, C1) and the first order second reset circuit (L5, C5), first electric capacity (C1), one termination the 3rd electric capacity (C3) of first inductance (L1) and the 5th electric capacity (C5), the common port that the 3rd inductance (L3) is connected with first blocking condenser (C12-1), first electric capacity (C1), first inductance (L1) other end ground connection, one end of another termination the 5th inductance (L5) of the 5th electric capacity (C5), the other end ground connection of the 5th inductance (L5), parallel resonance unit, the second level (L2, C2) and the second level second reset circuit (L6, C6), second electric capacity (C2) wherein, one termination the 4th electric capacity (C4) of second inductance (L2) and the 6th electric capacity (C6), the common port that the 4th inductance (L4) is connected with second blocking condenser (C12-2), second electric capacity (C2), second inductance (L2) other end ground connection, one end of another termination the 6th inductance (L6) of the 6th electric capacity (C6), the other end ground connection of the 6th inductance (L6).
2, the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs according to claim 1, it is characterized in that: 50 ohmage input ports (Port1) termination input signal of mounted on surface, the first zero is provided with circuit and by the first order first zero circuit (L3 is set, C3) and the second level first zero circuit (L4 is set, C4) form, the first order first zero is provided with circuit (L3, C3) and the second level first zero circuit (L4 is set, C4) be two groups of parallel resonance unit, it is the first zero that their resonance forms identical zero point, and the first order first zero is provided with circuit (L3, C3) be formed in parallel by first order first zero inductance (L3) and first order first zero electric capacity (C3); The second level first zero is provided with circuit (L4, C4) be formed in parallel by the second level first zero inductance (L4) and second level first zero electric capacity (C4), another termination first order first zero of input port (Port1) is provided with circuit (L3, C3) end that is connected, first order parallel resonance unit (L1, C1) be formed in parallel by first inductance (L1) and first electric capacity (C1), the second reset circuit is by the first order second reset circuit (L5, C5) and the second level second reset circuit (L6, C6) form, the first order second reset circuit (L5, C5) and the second level second reset circuit (L6, C6) be two groups of series resonance unit, it was second zero point that their resonance forms identical zero point, the first order second reset circuit (L5, C5) be in series by first order inductance at second zero point (L5) and the first order second minimum capacity (C5), the second level second reset circuit (L6, C6) be in series by second level inductance at second zero point (L6) and second level inductance at second zero point (C6), the first order first zero is provided with circuit (L3, C3) other end that the first order first zero inductance (L3) in is connected with first order first zero electric capacity (C3) respectively with first order parallel resonance unit (L1, one end of an end that C1) is connected and first blocking condenser (C12-1) and the first order second reset circuit (L5, one end of second minimum capacity 3 the 5th electric capacity (C5) C5) is connected, first order parallel resonance unit (L1, C1) other end that first inductance (L1) in is connected with first electric capacity (C1) and the first order second reset circuit (L5, one end of the first order inductance at second zero point (L5) C5) is connected and links to each other with earth terminal, one end of coupling inductance (L12) between another termination first order of first blocking condenser (C12-1), one end of coupling capacitance (C12-2) between another termination second level of coupling inductance between the first order (L12), parallel resonance unit, the second level (L2, C2) be formed in parallel by second inductance (L2) and second electric capacity (C2), the other end of second blocking condenser (C12-2) respectively with parallel resonance unit, the second level (L2, C2) end that second inductance (L2) in is connected with second electric capacity (C2) and the second level second reset circuit (L6, C6) end and the second level first zero of the second level second minimum capacity (C6) are provided with circuit (L4 in, C4) end that is connected connects, parallel resonance unit, the second level (L2, C2) other end that second inductance (L2) in is connected with second electric capacity (C2) and the second level second reset circuit (L6, one end of the second level inductance at second zero point (L6) C6) is connected and links to each other with earth terminal, the second level first zero is provided with circuit (L4, C4) other end that the second level first zero inductance (L4) in is connected with second level first zero electric capacity (C4) is connected an end of 50 ohmage output ports (Port2) of mounted on surface, another termination output signal of output port (Port2).
3, the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs according to claim 1 and 2, it is characterized in that: 50 ohmage input ports (Port1) of all mounted on surface, the first order first zero is provided with circuit (L3, C3), the second level first zero is provided with circuit (L4, C4), the first order second reset circuit (L5, C5), the second level second reset circuit (L6, C6), first order parallel resonance unit (L1, C1), parallel resonance unit, the second level (L2, C2), first blocking condenser (C12-1), coupling inductance between the first order (L12), second blocking condenser (C12-2), 50 ohmage output ports (Port2) of mounted on surface and earth terminal all adopt multilayer LTCC technology to realize, the first order first zero is provided with circuit (L3, C3), the second level first zero is provided with circuit (L4, C4) coupling by input and output side forms, first order parallel resonance unit (L1, C1) first inductance (L1), parallel resonance unit, the second level (L2, C2) second inductance (L2) is made of together the earth connection in the via structure of eight layers of made of the second layer to the and the 8th layer, first order parallel resonance unit (L1, C1) first electric capacity (C1), parallel resonance unit, the second level (L2, C2) second electric capacity (C2) is formed by the dielectric-slab of signals layer and the ground plate coupling of ground plane, first blocking condenser (C12-1), second blocking condenser (C12-2) is formed by the dielectric-slab of signals layer and the coupling between capacitor layers, coupling inductance between the first order (L12) is formed by the strip line of capacitor layers, the first order second reset circuit (L5, C5), the second level second reset circuit (L6, C6) realize by "T"-shaped stub; The first order second minimum capacity (C5) in the first order second reset circuit (L5, C5) realizes that by first inductance (L1) coupling of an arm and top the 5th inductance (L5) is then realized by distributed constant own; The second level second minimum capacity (C6) in the second level second reset circuit (L6, C6) is realized by second inductance (L2) coupling of another arm and top, second level inductance at second zero point (L6) is then realized by distributed constant own, "T"-shaped stub one end ground connection.
4, the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs according to claim 1 and 2, it is characterized in that: the 5th inductance (L5) that formed for second zero point, the 5th electric capacity (C5), the 6th inductance (L6), the 6th electric capacity (C6) is to be realized by "T"-shaped stub, the first order second reset circuit (L5, C5) first order second minimum capacity (C5) in is realized by first inductance (L1) coupling of an arm and top, first order inductance at second zero point (L5) is then realized by distributed constant own, the second level second reset circuit (L6, C6) second level second minimum capacity (C6) in realizes that by second inductance (L2) coupling of another arm and top second level inductance at second zero point (L6) is then realized by distributed constant own.
5, the little mode filter of high stop band and multi-zero suppression 2.4 gigahertzs according to claim 1 and 2, it is characterized in that: second inductance (L2) among first inductance (L1) in first order parallel resonance unit (L1, C1), parallel resonance unit, the second level (L2, the C2) is made of together the earth connection in the via structure of eight layers of made of the second layer to the and the 8th layer, adopts the stray inductance of through hole to realize.
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