CN102509828A - L-wave-band harmonic suppression minitype band-pass filter - Google Patents
L-wave-band harmonic suppression minitype band-pass filter Download PDFInfo
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Abstract
The invention discloses an L-wave-band harmonic suppression minitype band-pass filter which comprises input/output interfaces applicable to surface mounting, four parallel resonant units, three zero-point setting units, a Z-shaped cross-coupled circuit and input and output inductors, wherein the four parallel resonant units are realized by adopting a three-layer folding coupled strip-shaped line; each component is realized by adopting a more-than-two-layer low-temperature co-fired ceramic technology; and the input and output inductors are designed by adopting strip-shaped lines of distributed parameters. The L-wave-band harmonic suppression minitype band-pass filter disclosed by the invention has the advantages of small volume, light weight, high reliability, excellent electric property, good temperature stability, good electric property index batch consistency, low cost in volume production and the like, and is especially suitable for bluetooth transmission, ISM (industrial, scientific and medical) frequency band transmission, the communication of corresponding microwave frequency bands, digital radars, individual soldier satellite communication, multimode and multichannel communication system terminals for military and civil use, wireless communication hand-held terminals and the like, as well as corresponding systems which have rigor requirements in volume, weight, properties, reliability and the like.
Description
Technical field
The present invention relates to a kind of filter, particularly a kind of L-band harmonic wave restraining band pass filter.
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; Low loss, high band restraining band pass filter is the crucial electronic unit in this wave band reception and the transmitting branch, and 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.(300MHz～1GHz), because wavelength is grown (0.3 meter to 1 meter of wavelength), the volume of filter is directly proportional with operation wavelength, so volume (generally being about 45mm * 32mm * 8 mm) greatly at the microwave frequency low side for conventional design and manufacturing approach; The filter that constitutes like the metal resonant cavity, 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, 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 harmonic wave restraining band pass filter that a kind of volume is little, in light weight, reliability is high, temperature performance is stablized, electrical property excellent, electrical property consistency is good, cost is low in batches.
The technical scheme that realizes the object of the invention is: a kind of L-band harmonic wave restraining band pass filter; Comprise that 50 ohmage input ports, input inductance, first order parallel resonance unit, the first zero of mounted on surface are provided with 50 ohmage output port and earth terminals of circuit, parallel resonance unit, the second level, the second reset circuit, third level parallel resonance unit, the 3rd reset circuit, fourth stage parallel resonance unit, the 4th reset circuit, outputting inductance, mounted on surface; Input port is connected with input inductance; Output port is connected with outputting inductance; Parallelly connected first order parallel resonance unit, parallel resonance unit, the second level, third level parallel resonance unit and fourth stage parallel resonance unit between this outputting inductance and the input inductance, the first zero of between first order parallel resonance unit and parallel resonance unit, the second level, connecting is provided with circuit; The second reset circuit of connecting between parallel resonance unit, the second level and the third level parallel resonance unit; The 3rd reset circuit of connecting between third level parallel resonance unit and the fourth stage parallel resonance unit; The 4th reset circuit of connecting between the first order and fourth stage parallel resonance unit and the zigzag cross-couplings strip line; The other end of described 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 1.1 gigahertz higher harmonics restraining filters utilize multilayer LTCC technology (LTCC) characteristics, adopt 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 the electrical schematic diagram of L-band harmonic wave restraining band pass filter of the present invention.
Fig. 2 is the profile and the internal structure sketch map of L-band harmonic wave restraining band pass filter of the present invention.
Fig. 3 is the parallel resonance cellular construction sketch map of L-band harmonic wave restraining band pass filter of the present invention.
Fig. 4 is the three-dimensional all-wave simulation performance of a L-band harmonic wave restraining band pass filter of the present invention curve.
Fig. 5 is the main performance test result of L-band harmonic wave restraining band pass filter embodiment 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 and Fig. 3; The present invention is a kind of L-band harmonic wave restraining band pass filter; This filter comprises that 50 ohmage input port P1, input inductance L5, first order parallel resonance unit L1C1, the first zero of mounted on surface are provided with circuit L12C12, parallel resonance unit, second level L2C2, the second reset circuit L23C23, third level parallel resonance unit L3C3, the 3rd reset circuit L34C34, fourth stage parallel resonance unit L4,50 ohmage output port P2 and earth terminals of C4, the 4th reset circuit L14C14, outputting inductance L6, mounted on surface; 50 ohmage input port P1, the one termination input signal of mounted on surface; The end of another termination input inductance L5; The other end of input inductance L5 is connected with the public connecting end that first order parallel resonance unit L1C1, the first zero are provided with circuit L12C12, the 4th reset circuit L14C14; First order parallel resonance unit L1 wherein; C1 is formed in parallel by first inductance L 1 and first capacitor C 1, and the first zero is provided with circuit L12C12 and is in series by first zero inductance L 12 and first zero capacitor C 12, the 4th reset circuit L14C14 by the 4th zero point inductance L 14 and the 4th minimum capacity C14 be in series; The other end that the first zero is provided with circuit L12C12 is connected with the common port of parallel resonance unit, second level L2C2, the second reset circuit L23C23; Parallel resonance unit, second level L2C2 is formed in parallel by second inductance L 2 and second capacitor C 2, the second reset circuit L23C23 by second zero point inductance L 23 and the second minimum capacity C23 be in series; The other end of the second reset circuit L23C23 is connected with the common port of third level parallel resonance unit L3C3, the 3rd reset circuit L34C34; Third level parallel resonance unit L3C3 is formed in parallel by the 3rd inductance L 3 and the 3rd capacitor C 3, the 3rd reset circuit L34C34 by the 3rd zero point inductance L 34 and the 3rd minimum capacity C34 be in series; The other end of the 3rd reset circuit L34C34 is connected with the common port of fourth stage parallel resonance unit L4C4, the 4th reset circuit L14C14, outputting inductance L6, 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 L6 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 and Fig. 3; L-band harmonic wave restraining band pass filter of the present invention; Input port P1, input inductance L5, first order parallel resonance unit L1C1, the first zero are provided with circuit L12C12, parallel resonance unit, second level L2C2, the second reset circuit L23C23, third level parallel resonance unit L3C3, the 3rd reset circuit L34C34, fourth stage parallel resonance unit L4C4, the 4th reset circuit L14C14, outputting inductance L6, output port P2 and earth terminal and all adopt multilayer LTCC technology to realize; Wherein input inductance L5, outputting inductance L6 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 three layers of folding coupling strip line to realize; First zero capacitor C 12, the second minimum capacity C23, the 3rd minimum capacity C34, the 4th minimum capacity C14 adopt between first order parallel resonance unit L1C1 and parallel resonance unit, the second level L2C2 respectively, space coupling and distributed constant electric capacity are realized 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, between first order L1C1 and fourth stage parallel resonance unit L4C4 and the zigzag cross-couplings strip line, first zero inductance L 12, second zero point inductance L 23, the 3rd zero point inductance L 34, the 4th zero point inductance L 14 adopt between first order parallel resonance unit L1C1 and parallel resonance unit, the second level L2C2 respectively, 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, the space is coupled and the realization of distributed constant inductance between first order L1C1 and fourth stage parallel resonance unit L4C4 and the zigzag cross-couplings strip line.
In conjunction with Fig. 2, Fig. 3; L-band harmonic wave restraining band pass filter of the present invention; 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 adopt three layers of folding coupling strip line structure of distributed constant to realize; Wherein every layer of strip line one end is unsettled, other end ground connection.
L-band harmonic wave restraining band pass filter of the present invention; The first zero is provided with among the circuit L12C12; First zero inductance L 12 adopts space coupling and the realization of distributed constant inductance between first order parallel resonance unit L1C1 and parallel resonance unit, the second level L2C2, and space coupling and distributed constant electric capacity are realized between first zero capacitor C 12 employing first order parallel resonance unit L1C1 and parallel resonance unit, the second level L2C2; Among the second reset circuit L23C23; Second zero point inductance L 23 employing second level parallel resonance unit L2C2 and two parallel resonance unit of third level L3C3 between space coupling realize that with the distributed constant inductance the second minimum capacity C23 adopts space coupling and the realization of distributed constant electric capacity between second level parallel resonance unit L2C2 and the third level parallel resonance unit L3C3; Among the 3rd reset circuit L34C34; The 3rd zero point inductance L 34 adopt that the space coupling realizes with the distributed constant inductance between third level parallel resonance unit L3C3 and the fourth stage parallel resonance unit L4C4, the 3rd minimum capacity C34 adopts space coupling and the realization of distributed constant electric capacity between third level parallel resonance unit L3C3 and the fourth stage parallel resonance unit L4C4; Among the 4th reset circuit L14C14; The 4th zero point inductance L 14 adopt that the space coupling realizes with the distributed constant inductance between first order parallel resonance unit L1C1 and fourth stage parallel resonance unit L4C4 and the zigzag cross-couplings strip line, the 4th minimum capacity C14 adopts that the space is coupled and the realization of distributed constant electric capacity between one-level parallel resonance unit L1C1 and fourth stage parallel resonance unit L4C4 and the zigzag cross-couplings strip line.
L-band harmonic wave restraining band pass filter of the present invention; Its operation principle is summarized as follows: the broadband microwave signal of input arrives first order parallel resonance unit L1C1 through input port P1 through input inductance L5; The end that the end that first inductance L 1 is connected with first capacitor C 1 and the first zero are provided with circuit L12C12; End at first order parallel resonance unit L1C1; In the described broadband microwave signal; The first zero is provided with circuit L12C12 between near entering first order parallel resonance unit L1C1 of the microwave signal the first order parallel resonance unit resonance frequency and parallel resonance unit, second level L2C2, and near the microwave signal all the other non-first order parallel resonance unit resonance frequencies realizes first order filtering through first inductance L 1 and first capacitor C, 1 ground connection among the first order parallel resonance unit L1C1.The first zero is provided with near the stopband microwave signal of parallel resonance frequency of circuit L12C12; It is near the microwave signal first zero frequency; Be suppressed because of presenting high impedance, near the microwave frequency signal the non-first zero is provided with in the first zero inductance L 12 and first zero capacitor C 12 arrival second level parallel resonance unit L2C2 among the circuit L12C12 through the first zero.The end of the second reset circuit L23C23 between end that second inductance L 2 and second capacitor C 2 are connected and second level parallel resonance unit L2C2 and the third level parallel resonance unit L3C3; The process first order filtering and the first zero are provided with the microwave signal of circuit L12C12; Near parallel resonance unit, second level L2C2 resonance frequency microwave signal gets into the second reset circuit L23C23; Near all the other non-second level parallel resonance unit resonance frequencies 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.Near the parallel resonance frequency of the second reset circuit L23C23 stopband microwave signal; Near i.e. microwave signal second zero frequency; Be suppressed because of presenting high impedance; Near non-second zero point microwave frequency signal is through a end that second zero point among the second reset circuit L23C23, inductance L 23 was connected with the 3rd capacitor C 3 with the 3rd inductance L 3 among the second minimum capacity C23 arrival third level parallel resonance unit L3C3 and the end of the 3rd reset circuit L34C34; Through the first order, second level filtering and the first zero circuit L12C12 is set; The microwave signal of the second reset circuit L23C23; Get into the 3rd reset circuit L34C34 between third level parallel resonance unit L3C3 and the fourth stage parallel resonance unit L4C4 near the microwave signal the 3rd parallel resonance unit L3C3 resonance frequency; Near all the other non-the 3rd parallel resonance unit L34C34 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.Near the parallel resonance frequency of the 3rd reset circuit L34C34 stopband microwave signal; Near i.e. microwave signal the 3rd zero frequency; Be suppressed because of presenting high impedance; Near non-the 3rd zero point microwave frequency signal through among the 3rd reset circuit L34C34 the 3rd zero point inductance L 34 and the 3rd minimum capacity C34 arrive the 4th inductance L 4 and the 4th capacitor C 4 are connected among the fourth stage parallel resonance unit L4C4 a end and first and fourth stage parallel resonance unit L1C1, L4C4 and zigzag cross-couplings strip line between the end of the 4th reset circuit L14C14; Through the microwave signal of the first order, the second level, third level filtering and first, second, third reset circuit, near the microwave signal fourth stage parallel resonance unit L4C4 resonance frequency gets into the 4th reset circuit L14C14.Near the parallel resonance frequency of the 4th reset circuit L14C14 stopband microwave signal; Near i.e. microwave signal the 4th zero frequency; Be suppressed because of presenting high impedance; Near the 4th parallel resonance unit L4C4 resonance frequency microwave signal and near the microwave frequency letter non-the 4th zero point want to add an end that meets surface-pasted 50 ohmage output port P2 afterwards through outputting inductance L6; Near all the other non-the 4th parallel resonance unit resonance frequencies 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 first order filtering, second level filtering, third level filtering, fourth stage filtering; The first zero is provided with circuit L12C12; The second reset circuit L23C23, the 3rd reset circuit L34C34, the microwave signal of the 4th reset circuit L14C14; Through the other end output of surface-pasted 50 ohmage output port P2, thereby realize L-band higher harmonics restraining bandpass filtering function.
L-band harmonic wave restraining band pass filter is owing to be to adopt multilayer LTCC technology to realize; Its low-temperature co-burning ceramic material and metallic pattern form at about 900 ℃ of sintering temperatures; So have extreme high reliability and temperature stability; 3 D stereo is integrated to be grounded and to encapsulate with multilayer folding structure and outer surface metallic shield because structure adopts, thereby volume is significantly reduced.
It is 2.4mm * 2.1mm * 0.75mm that L-band harmonic wave restraining band pass filter is implemented volume.This filter bandwidht is 300MHz, and the logical in-band insertion loss of simulation filter device is all less than 3 decibels, and low stopband suppresses to be superior to-50 decibels, and high stopband suppresses to be superior to-40 decibels, has good performance of filter.
Claims (4)
1. L-band harmonic wave restraining band pass filter; It is characterized in that: comprise mounted on surface 50 ohmage input ports (P1), input inductance (L5), first order parallel resonance unit (L1, C1), the first zero be provided with circuit (L12, C12), parallel resonance unit, the second level (L2; C2), the second reset circuit (L23; C23), third level parallel resonance unit (L3, C3), the 3rd reset circuit (L34, C34), fourth stage parallel resonance unit (L4; C4), the 4th reset circuit (L14, C14), 50 ohmage output port (P2) and earth terminals of outputting inductance (L6), mounted on surface; 50 ohmage input ports (P1) termination input signal of mounted on surface; One end of another termination input inductance (L5), and the other end of input inductance (L5) and first order parallel resonance unit (L1, C1), the first zero is provided with circuit (L12; C12), the 4th reset circuit (L14; C14) public connecting end is connected, and wherein (L1 C1) is formed in parallel by first inductance (L1) and first electric capacity (C1) in first order parallel resonance unit; The first zero is provided with circuit (L12; C12) be in series by first zero inductance (L12) and first zero electric capacity (C12), (L14's the 4th reset circuit C14) is in series by the 4th inductance at zero point (L14) and the 4th minimum capacity (C14); The first zero is provided with circuit (L12; C12) the other end and parallel resonance unit, the second level (L2, C2), the second reset circuit (L23, common port C23) is connected; Parallel resonance unit, the second level (L2; C2) be formed in parallel by second inductance (L2) and second electric capacity (C2), (L23's second reset circuit C23) is in series by second inductance at zero point (L23) and second minimum capacity (C23); The second reset circuit (L23; C23) the other end and third level parallel resonance unit (L3, C3), the 3rd reset circuit (L34, common port C34) is connected; Third level parallel resonance unit (L3; C3) be formed in parallel by the 3rd inductance (L3) and the 3rd electric capacity (C3), (L34's the 3rd reset circuit C34) is in series by the 3rd inductance at zero point (L34) and the 3rd minimum capacity (C34); The 3rd reset circuit (L34; C34) the other end and fourth stage parallel resonance unit (L4; C4), the 4th reset circuit (L14; C14), the common port of outputting inductance (L6) 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 (L6) 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. L-band harmonic wave restraining band pass filter according to claim 1 is characterized in that: and input port (P1), input inductance (L5), first order parallel resonance unit (L1, C1), the first zero is provided with circuit (L12; C12), parallel resonance unit, the second level (L2, C2), the second reset circuit (L23, C23), third level parallel resonance unit (L3; C3), the 3rd reset circuit (L34, C34), fourth stage parallel resonance unit (L4, C4), the 4th reset circuit (L14; C14), outputting inductance (L6), output port (P2) and earth terminal all adopt multilayer LTCC technology to realize, wherein input inductance (L5), outputting inductance (L6) all adopt the strip line of distributed constant to realize 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 three layers of folding coupling strip line to realize, first zero electric capacity (C12), second minimum capacity (C23), the 3rd minimum capacity (C34), the 4th minimum capacity (C14) adopt first order parallel resonance unit respectively (L1 are 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, first order parallel resonance unit (L1; C1) with fourth stage parallel resonance unit (L4, C4) between space coupling and the realization of distributed constant electric capacity, first zero inductance (L12), second inductance at zero point (L23), the 3rd inductance at zero point (L34), the 4th inductance at zero point (L14) 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, first order parallel resonance unit (L1, C1) with fourth stage parallel resonance unit (L4, C4) between space coupling and the realization of distributed constant inductance.
3. according to the desired L-band harmonic wave of claim 1 restraining band pass filter; 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) adopt three 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.
4. according to the desired L-band harmonic wave of claim 1 restraining band pass filter; It is characterized in that: wherein the first zero is provided with circuit (L12; C12) in, first zero inductance (L12) adopts first order parallel resonance unit, and (L1 is C1) with parallel resonance unit, the second level (L2; C2) space coupling and distributed constant inductance are realized between; First zero electric capacity (C12) adopt first order parallel resonance unit (L1, C1) with parallel resonance unit, the second level (L2, C2) between space coupling and the realization of distributed constant electric capacity; The second reset circuit (L23; C23) in, second inductance at zero point (L23) adopts parallel resonance unit, the second level, and (L2 is C2) with two parallel resonance unit of the third level (L3; C3) space coupling and distributed constant inductance are realized between; Second minimum capacity (C23) adopt parallel resonance unit, the second level (L2, C2) with third level parallel resonance unit (L3, C3) between space coupling and the realization of distributed constant electric capacity; The 3rd reset circuit (L34; C34) in, the 3rd inductance at zero point (L34) adopts third level parallel resonance unit, and (L3 is C3) with fourth stage parallel resonance unit (L4; C4) space coupling and distributed constant inductance are realized between; The 3rd minimum capacity (C34) adopt third level parallel resonance unit (L3, C3) with fourth stage parallel resonance unit (L4, C4) between space coupling and the realization of distributed constant electric capacity; The 4th reset circuit (L14; C14) in, the 4th inductance at zero point (L14) adopts first order parallel resonance unit, and (L1 is C1) with fourth stage parallel resonance unit (L4; C4) space coupling and the realization of distributed constant inductance and between the zigzag cross-couplings strip line; The 4th minimum capacity (C14) adopts one-level parallel resonance unit, and (L1, C1) (L4 is C4) with space coupling between the zigzag cross-couplings strip line and the realization of distributed constant electric capacity with fourth stage parallel resonance unit.
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| CN103178317A (en) * | 2012-12-29 | 2013-06-26 | 南京理工大学 | S-band steep-sideband band-pass microfilter |
| CN103413993A (en) * | 2013-08-01 | 2013-11-27 | 南京理工大学 | Distributed miniature band-pass balance filter |
| CN104409802A (en) * | 2014-09-13 | 2015-03-11 | 南京理工大学 | Miniature microwave and millimeter wave self-load I/Q (In-phase/Quadrature) filter |
| CN105024120A (en) * | 2015-07-13 | 2015-11-04 | 南京理工大学 | X wave band and Ku wave band mixing duplex filter |
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| CN101621145A (en) * | 2009-08-11 | 2010-01-06 | 南京理工大学 | L wave band miniature band pass filter with low loss and high suppression |
| CN102006026A (en) * | 2010-11-24 | 2011-04-06 | 南京理工大学 | Ku-wave band and ultra-narrow band micro band-pass filter with low loss and high inhibition |
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| CN101621145A (en) * | 2009-08-11 | 2010-01-06 | 南京理工大学 | L wave band miniature band pass filter with low loss and high suppression |
| CN102006026A (en) * | 2010-11-24 | 2011-04-06 | 南京理工大学 | Ku-wave band and ultra-narrow band micro band-pass filter with low loss and high inhibition |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103178317A (en) * | 2012-12-29 | 2013-06-26 | 南京理工大学 | S-band steep-sideband band-pass microfilter |
| CN103413993A (en) * | 2013-08-01 | 2013-11-27 | 南京理工大学 | Distributed miniature band-pass balance filter |
| CN103413993B (en) * | 2013-08-01 | 2015-09-30 | 南京理工大学 | Distributed type minisize band leads to balance filter |
| CN104409802A (en) * | 2014-09-13 | 2015-03-11 | 南京理工大学 | Miniature microwave and millimeter wave self-load I/Q (In-phase/Quadrature) filter |
| CN104409802B (en) * | 2014-09-13 | 2017-03-15 | 南京理工大学 | The self-supported I/Q orthogonal filters of miniature microwave and millimeter wave |
| CN105024120A (en) * | 2015-07-13 | 2015-11-04 | 南京理工大学 | X wave band and Ku wave band mixing duplex filter |
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Inventor after: Dai Yongsheng Inventor after: Sun Hongtu Inventor after: Han Min Inventor after: Yin Honghao Inventor after: Qi Yong Inventor after: Li Ping Inventor after: Xie Qiuyue Inventor after: Han Qunfei Inventor after: Chen Riqing Inventor after: Feng Yuan Inventor after: Zuo Tongsheng Inventor before: Dai Yongsheng Inventor before: Yin Honghao Inventor before: Li Ping Inventor before: Xie Qiuyue Inventor before: Han Qunfei Inventor before: Feng Yuan Inventor before: Zuo Tongsheng Inventor before: Sun Hongtu Inventor before: Han Min |
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Application publication date: 20120620 |