CN101908663B - Self-adaptive bandpass filter and related down converter thereof - Google Patents

Self-adaptive bandpass filter and related down converter thereof Download PDF

Info

Publication number
CN101908663B
CN101908663B CN 200910143956 CN200910143956A CN101908663B CN 101908663 B CN101908663 B CN 101908663B CN 200910143956 CN200910143956 CN 200910143956 CN 200910143956 A CN200910143956 A CN 200910143956A CN 101908663 B CN101908663 B CN 101908663B
Authority
CN
China
Prior art keywords
band pass
pass filter
resonator
live width
resonators
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN 200910143956
Other languages
Chinese (zh)
Other versions
CN101908663A (en
Inventor
王则闵
蔡文才
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wistron Neweb Corp
Original Assignee
Wistron Neweb Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wistron Neweb Corp filed Critical Wistron Neweb Corp
Priority to CN 200910143956 priority Critical patent/CN101908663B/en
Publication of CN101908663A publication Critical patent/CN101908663A/en
Application granted granted Critical
Publication of CN101908663B publication Critical patent/CN101908663B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

The invention relates to a self-adaptive bandpass filter and a related down converter thereof. The bandpass filter contains an input port, an output port and a plurality of resonators. The input port is used for receiving a radio-frequency signal; the output port is used for outputting a filtering signal; and the plurality of resonators are arranged between the input port and the output port and are used for performing bandpass filtering on the radio-frequency signal to generate the filtering signal, wherein the plurality of resonators have at least two different line widths to make the output impedance of the bandpass filter and the input impedance of a post-stage circuit coupled with the output port mutually matched. The gradually changed resonator line widths are used to make the output impedance of the bandpass filter and the input impedance of the post-stage circuit mutually matched. Furthermore, the bandpass filter is applied to the down converter, so that the components of a matching circuit are saved, the cost is reduced, and the output characteristic of a post-stage mixer is improved.

Description

Band pass filter and related frequency demultiplier thereof from coupling
Technical field
The present invention relates to a kind of band pass filter and related frequency demultiplier thereof, relate in particular to a kind of band pass filter and related frequency demultiplier thereof from coupling.
Background technology
Satellite communication system has the characteristic of wideband and large coverage, is widely used in fields such as detection, military affairs, communication network, data and mobile communication.For the terrestrial user of satellite communication system, must possess antenna, satellite frequency demultiplier (Low-noise Block Down-converter, LNB) and demodulator, could receiving satellite signal.Satellite-signal is an intermediate-freuqncy signal through the satellite frequency demultiplier frequency reducing after being received by antenna, produces play signal through the demodulator demodulation at last, exports user's set to, like TV.
Please refer to Fig. 1, Fig. 1 is the functional-block diagram of a known satellite frequency demultiplier 10.Satellite frequency demultiplier 10 includes a low noise amplifier 100, a band pass filter (Band-pass Filter) 102, one coupling (Matching) circuit 104, a frequency mixer (Mixer) 106 and a local oscillator (Local Oscillator) 108.Radiofrequency signal V RFReceive the back by antenna and get into satellite frequency demultiplier 10, after low noise amplifier 100 amplifies, by image frequency (Image Frequency) signal in the band pass filter 102 filtering radiofrequency signals to produce filtering signal VF RF, be downconverted to the intermediate frequency frequency range through frequency mixer 106 again, output intermediate-freuqncy signal V IF Band pass filter 102 is little band (Microstrip) band pass filter; Its implementation mainly contains following several kinds: hair clip formula (Hairpin) band pass filter, terminal coupling (End-coupled) band pass filter and parallel coupling (Parallel-coupled) band pass filter, letter in regular turn is shown in Fig. 2 A to Fig. 2 C.
Please refer to Fig. 2 A, Fig. 2 A is the sketch map of a known hairpin-line bandpass filter 20.Hairpin-line bandpass filter 20 includes an input port PI A, an output port PO AAnd resonator (Resonator) RN A_1～RN A_nInput port PI AAnd output port PO ABe connected to prime and late-class circuit, in order to receive and the output signal.Resonator RN A_1～RN A_nThe live width W of each resonator identical, the bus of each resonator be about be receive signal wavelength X 1/2nd.Fig. 2 B is the sketch map of known one terminal strap bandpass filter 22.Terminal strap bandpass filter 22 includes an input port PI B, an output port PO BAnd resonator RN B_1～RN B_nResonator RN B_1～RN B_nBe the lead that is parallel to each other and live width W is identical, the line length L of each resonator is λ/2.Fig. 2 C is the sketch map of known one parallel strap bandpass filter 24.Parallel strap bandpass filter 24 includes an input port PI C, an output port PO CAnd resonator RN C_1～RN C_nResonator RN C_1～RN C_nBe the lead that is parallel to each other and live width W is identical, the line length L of each resonator is λ/2, and the conductor length of each resonator and adjacent resonator cross-over connection is λ/4.The quantity of the resonator of above-mentioned various band pass filters is relevant with filtering performance.
Be the characteristic of the coaxial cable that cooperates measuring instrument, band pass filter 102 is typically designed to input impedance output impedance is equaled 50 Ω: 50 Ω.On the other hand; Frequency mixer 106 is made up of field-effect transistor (Field Effect Transistor) or bipolar junction transistor active elements such as (Bipolar Junction Transistor); Its input impedance is different with the output impedance of band pass filter 102, and is lower usually.Match circuit 104 promptly is used for controlling the impedance matching between band pass filter 102 and the frequency mixer 106, to reduce the loss of radiofrequency signal in transmission course.
With known technology, the output of band pass filter and input impedance is in when design, can not consider especially thereafter the level circuit unit why.Therefore, no matter in satellite frequency demultiplier 10 or other frequency demultipliers, the output port of band pass filter must be linked to match circuit earlier, carries out impedance matching with late-class circuit.Yet under the situation that match circuit exists, transmission line effect can't be reduced to minimum, export to by band pass filter frequency mixer radiofrequency signal loss thereby can't more effectively improve.
Summary of the invention
Therefore, main purpose of the present invention promptly is to provide a kind of band pass filter and related frequency demultiplier thereof, the output impedance of this band pass filter self can with the input impedance matching of late-class circuit.
The present invention discloses a kind of band pass filter, includes an input port, is used for receiving a radiofrequency signal; One output port is used for exporting a filtering signal; And a plurality of resonators, be located between this input port and this output port, be used for this radiofrequency signal is carried out bandpass filtering treatment, to produce this filtering signal.These a plurality of resonators have at least two kinds of different live widths, make the output impedance of this band pass filter and the input impedance of the late-class circuit that this output port is coupled mate each other.
The present invention discloses a kind of band pass filter in addition, includes an input port, is used for receiving a radiofrequency signal; One output port is used for exporting a filtering signal; And a resonator, be located between this input port and this output port, be used for this radiofrequency signal is carried out bandpass filtering treatment, to produce this filtering signal.The live width of this resonator and the live width of this input port are different, make the output impedance of this band pass filter and the input impedance of the late-class circuit that this output port is coupled mate each other.
The present invention discloses a kind of frequency demultiplier that is used for a wireless communication receiver in addition, includes a frequency mixer and a band pass filter.This frequency mixer is used for according to a local oscillated signal, and the frequency of a filtering signal is carried out down conversion process, to export an intermediate-freuqncy signal.This band pass filter is coupled to this frequency mixer, and it includes an input port, is used for receiving a radiofrequency signal; One output port is used for exporting a filtering signal; And a plurality of resonators, be located between this input port and this output port, be used for this radiofrequency signal is carried out bandpass filtering treatment, to produce this filtering signal.These a plurality of resonators have at least two kinds of different live widths, make the output impedance of this band pass filter and the input impedance of the late-class circuit that this output port is coupled mate each other.
The present invention discloses a kind of frequency demultiplier that is used for a wireless communication receiver in addition, includes a frequency mixer and a band pass filter.This frequency mixer is used for according to a local oscillated signal, and the frequency of a filtering signal is carried out down conversion process, to export an intermediate-freuqncy signal.This band pass filter is coupled to this frequency mixer, and it includes an input port, is used for receiving a radiofrequency signal; One output port is used for exporting a filtering signal; An and resonator; Be located between this input port and this output port; Be used for this radiofrequency signal is carried out bandpass filtering treatment; To produce this filtering signal, the live width of this resonator and the live width of this input port are different, make the output impedance of this band pass filter and the input impedance of the late-class circuit that this output port is coupled mate each other.
The present invention is complementary the output impedance of band pass filter and the input impedance of late-class circuit with the resonator live width of gradual change.Further, band pass filter of the present invention is applied in the frequency demultiplier, not only can save the assembly of match circuit, reduces cost, and more can improve the output characteristic of the frequency mixer of back level.
Description of drawings
Fig. 1 is the functional-block diagram of a known satellite frequency demultiplier.
Fig. 2 A is the sketch map of a known hairpin-line bandpass filter.
Fig. 2 B is the sketch map of known one terminal strap bandpass filter.
Fig. 2 C is the sketch map of known one parallel strap bandpass filter.
Fig. 3 to Fig. 6 is the sketch map of the band pass filter of the embodiment of the invention.
Fig. 7 is the functional-block diagram of a satellite frequency demultiplier of the embodiment of the invention.
Fig. 8 is the noise characteristic curve chart of a frequency mixer among Fig. 7.
Fig. 9 is the conversion gain curve chart of a frequency mixer among Fig. 7.
The primary clustering symbol description:
10,70 satellite frequency demultipliers
100,700 low noise amplifiers
102,702,20,22,24,30,40,50,60 band pass filters
104 match circuits
106,704 frequency mixers
108,706 local oscillators
PI A, PI B, PI C, PI 1～PI 6Input port
PO A, PO B, PO C, PO 1～PO 6Output port
RN A_1～RN A_n, RN B_1～RN B_n, RN C_1～RN C_n, RN 3_1～RN 3_3, RN 4_1～RN 4_3, RN 5_1～RN 5_3, RN 6_1～RN 6_3Resonator
P 3_11, P 3_12, P 3_21, P 3_22, P 3_31, P 3_32The section portion of resonator
W, W 1～W 6The live width of resonator
The line length of L resonator
V RFRadiofrequency signal
VF RFFiltering signal
V IFIntermediate-freuqncy signal
C1, C2, S1, S2 curve
Embodiment
Please refer to Fig. 3, Fig. 3 is the sketch map of a band pass filter 30 of the embodiment of the invention.Band pass filter 30 is the hair clip band tape bandpass filter that declines, and includes an input port PI 3, an output port PO 3And resonator RN 3_1～RN 3_3Input port PI 3Be used for receiving a radiofrequency signal, output port PO 3Be used for exporting a filtering signal.Resonator RN 3_1～RN 3_3For U type resonator, be located at input port PI 3With output port PO 3Between, from input port PI 3Rising is resonator RN in regular turn 3_1, RN 3_2, RN 3_3, be used for radiofrequency signal is carried out bandpass filtering treatment, to produce filtering signal.Resonator RN 3_1～RN 3_3Live width be under the situation of the input impedance of the late-class circuit of known band pass filters 30, the purpose of mating each other for the input impedance of the output impedance that reaches band pass filter 30 and late-class circuit and designing.The input impedance of late-class circuit be late-class circuit measure the input impedance during lowest noise.
Details are as follows in the design of band pass filter 30.The input impedance of hypothesis late-class circuit is lower than the input impedance of band pass filter 30 among Fig. 3, therefore, and the closer to output port PO 3The live width of resonator big more, and no longer be wide, can be complementary with late-class circuit with the output impedance of control band pass filter 30 with low input impedance.Resonator RN 3_1～RN 3_3In each resonator include two sections portions, wherein one section portion is near input port PI 3, another section portion is then near output port PO 3, near output port PO 3The live width of section portion greater than near the live width of the section portion of input port PI3.Resonator RN 3_1The one section P of portion that is comprised 3_11Near input port PI 3, the P of another section portion 3_12Then near output port PO 3, the P of section portion 3_12Live width W 2Greater than the P of section portion 3_11Live width W 1Similarly, resonator RN 3_2Comprise two sections P of portion 3_21And P 3_22, the P of section portion 3_22Live width W 3Greater than the P of section portion 3_21Live width W 2Resonator RN 3_3Comprise two sections P of portion 3_31And P 3_32, the P of section portion 3_32Live width W 4Greater than the P of section portion 3_31Live width W 3In other words, resonator RN 3_1～RN 3_3Wherein have four kinds of different live widths.Through resonator RN 3_1～RN 3_3In the live width of progressive increase, the output impedance of band pass filter 30 can be complementary with the low input impedance of late-class circuit.
Please refer to Fig. 4, Fig. 4 is the sketch map of a band pass filter 40 of the embodiment of the invention.Band pass filter 40 also is with the tape bandpass filter for hair clip declines, and includes an input port PI 4, an output port PO 4And resonator RN 4_1～RN 4_3Input port PI 4Be used for receiving a radiofrequency signal, output port PO 4Be used for exporting a filtering signal.Resonator RN 4_1～RN 4_3Be located at input port PI 4With output port PO 4Between, from input port PI 4Rising is resonator RN in regular turn 4_1, RN 4_2, RN 4_3, be used for radiofrequency signal is carried out bandpass filtering treatment, to produce filtering signal.The band pass filter 30 of similar Fig. 3, in the band pass filter 40 the closer to output port PO 4The live width of resonator big more, i.e. resonator RN 4_3Live width W 3＞resonator RN 4_2Live width W 2＞resonator RN 4_1Live width W 1Different is resonator RN 4_1～RN 4_3In a kind of live width is only arranged in each resonator.In other words, in band pass filter 40, each resonator is not further divided into a plurality of sections different portions of live width, or it is identical to can be considered the width of each section portion in each resonator.
By on can know that band pass filter 30 and band pass filter 40 be all with the resonator live width of gradual increase, the low input impedance of controlling its output impedance and late-class circuit is mated each other.Can know that in like manner the resonator live width that the band pass filter of other embodiment of the present invention can also successively decrease is controlled its output impedance, be complementary with the late-class circuit that has than high input impedance.The output impedance of known band pass filter and input impedance symmetry; Therefore the live width of each resonator is identical, and under comparing, the present invention is through the resonator live width of gradual change; Make the output impedance of band pass filter no longer be symmetrical in input impedance; But mate each other with the input impedance of late-class circuit, and then can save the match circuit between band pass filter and the late-class circuit, reduce the assembly cost.Because band pass filter of the present invention and its late-class circuit mate each other, be called band pass filter from coupling (Self-matching).
The difference of band pass filter 30 and band pass filter 40 is, band pass filter 30 is that one section portion with resonator increased live width in one stage, and band pass filter 40 is a stage to increase live width with a resonator then.It should be noted that in other embodiment of the present invention, is the mode that a stage increases live width with the section portion of resonator or resonator, can be used for a band pass filter simultaneously, also can optionally be used for a part but not whole resonators.For instance, a hairpin-line bandpass filter of the embodiment of the invention includes 3 resonators and is divided into 6 section portions altogether, with W 1～W 6The conductor width of representing each section portion of each resonator between input port to output port respectively, the live width size of each section portion is W 1＜W 2＜W 3＜W 4＜W 5＜W 6, the output impedance of band pass filter and the low input impedance of late-class circuit are complementary.
Note that the upper extreme point that a width metal lines is connected in a lametta that is shaped as of input port among Fig. 3 and Fig. 4 or output port, the part of this lametta is called the coupling line of input port or output port.In other embodiment of the present invention, the input port of hairpin-line bandpass filter or output port also can be connected in the optional position on the coupling line, the for example intermediate point of coupling line or lower extreme point etc.In addition, in the hairpin-line bandpass filter of Fig. 3 and Fig. 4, the opening of U type resonator is up and down reverse interleaved arrangement, and this opening arrangement mode is merely one embodiment of the invention and unrestricted.The opening of any two adjacent U type resonators of hairpin-line bandpass filter is same direction, also rightabout.In other words, the opening of all U type resonators maybe all same direction, or all staggered up and down, or the opening direction of the resonator that only part is adjacent is staggered.The opening direction of the shape of above-mentioned input port and output port and U type resonator can arbitrarily design, as long as control makes the output impedance of band pass filter and the input impedance matching of late-class circuit.
Gradual change type resonator live width proposed by the invention except being applied to hairpin-line bandpass filter, also can be used for two kinds of common microstrip line band pass filters, promptly parallel strap bandpass filter and terminal strap bandpass filter in addition.Please refer to Fig. 5, Fig. 5 is the sketch map of a band pass filter 50 of the embodiment of the invention.Band pass filter 50 is a parallel strap bandpass filter, includes an input port PI 5, an output port PO 5And resonator RN 5_1～RN 5_3Input port PI 5, output port PO 5And resonator RN 5_1～RN 5_3Operation and previous embodiment in corresponding cells identical, do not give unnecessary details at this.Resonator RN 5_1～RN 5_3Be located at input port PI 5With output port PO 5Between, from input port PI 5Rising is resonator RN in regular turn 5_1, RN 5_2, RN 5_3, it is parallel to each other and adjacent two resonators have the cross-over connection of part lead; The closer to output port PO 5Resonator, live width is big more.Resonator RN 5_1～RN 5_3In each resonator include two sections portions, wherein one section portion is near input port PI 5, another section portion is then near output port PO 5, near output port PO 5The live width of section portion greater than near input port PI 5The live width of section portion.Resonator RN 5_1～RN 5_3In each section portion of each resonator, in Fig. 5, be not referred to as with label in addition, and only indicate the width of each section portion, with the clear execution mode that shows the gradual change width.Resonator RN 5_1～RN 5_3In the width of each section portion be W in regular turn 1, W 2, W 2, W 3, W 3, W 4, its change width pattern is similar with the band pass filter 30 of Fig. 3.
Please refer to Fig. 6, Fig. 6 is the sketch map of a band pass filter 60 of the embodiment of the invention.Band pass filter 60 is a terminal strap bandpass filter.Band pass filter 60 includes an input port PI 6, an output port PO 6And resonator RN 6_1～RN 6_3Input port PI 6, output port PO 6And resonator RN 6_1～RN 6_3Operation and previous embodiment in corresponding cells identical, do not give unnecessary details at this.Resonator RN 6_1～RN 6_3Be located at input port PI 6With output port PO 6Between, from input port PI 6Rising is resonator RN in regular turn 6_1To resonator RN 6_3, be parallel to each other.Resonator RN 6_1～RN 6_3In the line length L of each resonator identical, live width is different, is W in regular turn 1＜W 2＜W 3The closer to output port PO 6Resonator, live width is big more.
Above-mentioned band pass filter 30,40,50 and 60 is an example to have 3 resonators all.In fact, no matter be hair clip formula, parallel coupling or terminal strap bandpass filter, the present invention only needs at least one resonator can reach the target of adjustment output impedance.With terminal strap bandpass filter, if only comprise a resonator, the live width of this resonator must be different with the live width of input port, to reach the adjustment of output impedance.With hairpin-line bandpass filter and parallel strap bandpass filter; If only comprise a resonator; Can reach the adjustment of output impedance, perhaps the not segmentation of live width of this resonator through two sections different portions of live width in the single resonator; But (, be exactly and resonator RN as far as hairpin-line bandpass filter 40 with the live width of input port 4_1The live width of the lametta of coupling) different, to reach the adjustment of output impedance.
The present invention further is used for the embodiment of above-mentioned band pass filter the frequency demultiplier of wireless communication receiver, to save in the known frequency demultiplier employed match circuit between the band pass filter and late-class circuit.Please refer to Fig. 7, Fig. 7 is the functional-block diagram of a satellite frequency demultiplier 70 of the embodiment of the invention.Satellite frequency demultiplier 70 includes a low noise amplifier 700, a band pass filter 702, a frequency mixer 704 and a local oscillator 706.Low noise amplifier 700 is used for amplifying the radiofrequency signal V that antenna receives RFBand pass filter 702 is coupled to low noise amplifier 700, is used for filtering radiofrequency signal V RFIn the image frequency signal, to produce a filtering signal VF RFBand pass filter 702 is aforesaid band pass filter 30,40,50,60 or similar variant.To be usually used in the frequency mixer of satellite frequency demultiplier, the input impedance when having lowest noise is between 5 Ω～20 Ω, much smaller than input impedance 50 Ω of band pass filter 702.Resonator live width cumulative in the band pass filter 702 promptly designs according to the input impedance of the frequency mixer 704 of level afterwards.Frequency mixer 704 need not be coupled to any match circuit, directly is coupled to band pass filter 702 and local oscillator 706, is used for the local oscillated signal that produced according to local oscillator 706, with filtering signal VF RFFrequency reduce to intermediate frequency, to export an intermediate-freuqncy signal V IF
Satellite frequency demultiplier 70 is merely one embodiment of the invention, and the embodiment of above-mentioned band pass filter also can be used in the frequency demultiplier of other wireless communication receivers.It should be noted that the filtering signal VF that band pass filter 702 produces RFNot influenced by the transmission line effect of outside match circuit and cause the loss of signal or noise jamming, therefore, (Conversion Gain) is better than the frequency mixer in the known frequency demultiplier for the noise characteristic of frequency mixer 704 and conversion gain.Please refer to Fig. 8, Fig. 8 is the noise characteristic curve chart of the frequency mixer 704 in the satellite frequency demultiplier 70 of Fig. 7, and wherein curve S 1 is the noise characteristic curve of frequency mixer in the known frequency demultiplier, and curve S 2 is the noise characteristic curve of frequency mixer 704; Curve S 2 average specific curve S 1 low 1～2dB, (Noise Flatness) is also better for the noise flatness.Please again with reference to figure 9, Fig. 9 is the conversion gain curve chart of the frequency mixer 704 in the satellite frequency demultiplier 70 of Fig. 7, and wherein curve C 1 is the conversion gain curve of frequency mixer in the known frequency demultiplier, and curve C 2 is the conversion gain curve of frequency mixer 704.Can know that by Fig. 9 be indebted to the characteristic that band pass filter 702 can mate output impedance certainly, the conversion gain of frequency mixer 704 significantly promotes.
In sum, the present invention is complementary the output impedance of band pass filter and the input impedance of late-class circuit with the resonator live width of gradual change.Further, band pass filter of the present invention is applied in the frequency demultiplier, not only can save the assembly of match circuit, reduces cost, and more can improve the output characteristic of the frequency mixer of back level.
The above is merely preferred embodiment of the present invention, and every equivalent variations and modification of being done according to claims scope of the present invention all should belong to covering scope of the present invention.

Claims (30)

1. band pass filter comprises:
One input port is used for receiving a radiofrequency signal;
One output port is used for exporting a filtering signal; And
A plurality of resonators; Be located between said input port and the said output port; Be used for said radiofrequency signal is carried out bandpass filtering treatment; To produce said filtering signal, said a plurality of resonators have at least two kinds of different live widths, make the output impedance of said band pass filter and the input impedance of the late-class circuit that said output port is coupled mate each other;
Wherein, said band pass filter is coupled directly to a frequency mixer in a frequency demultiplier; And
Wherein, the input impedance of said late-class circuit be said late-class circuit measure the input impedance during lowest noise.
2. band pass filter as claimed in claim 1; Each resonator of wherein said a plurality of resonators comprises one first section portion of approaching said output port and one second section portion of approaching said input port, and the live width of the live width of said first section portion and said second section portion is different.
3. band pass filter as claimed in claim 2, the live width of wherein said first section portion is greater than the live width of said second section portion.
4. band pass filter as claimed in claim 1, a resonator comprises a plurality of sections portions that live width is different in wherein said a plurality of resonators.
5. band pass filter as claimed in claim 1, the live width of two adjacent resonators is different in wherein said a plurality of resonators.
6. band pass filter as claimed in claim 1, in wherein said a plurality of resonators in the two adjacent resonators, near the live width of a resonator of said output port greater than near the live width of another resonator of said input port.
7. band pass filter as claimed in claim 1, wherein said band pass filter are a hairpin-line bandpass filter.
8. band pass filter as claimed in claim 7, wherein said band pass filter comprise a plurality of U type resonators, and the opening direction of the opening direction of a U type resonator and adjacent another U type resonator is different in said a plurality of U type resonators.
9. band pass filter as claimed in claim 7, wherein said band pass filter comprise a plurality of U type resonators, and the opening direction of a U type resonator is identical with the opening direction of adjacent another U type resonator in said a plurality of U type resonators.
10. band pass filter as claimed in claim 1, wherein said band pass filter are a parallel strap bandpass filter.
11. band pass filter as claimed in claim 1, wherein said band pass filter are a terminal strap bandpass filter.
12. a band pass filter comprises:
One input port is used for receiving a radiofrequency signal;
One output port is used for exporting a filtering signal; And
One resonator; Be located between said input port and the said output port; Be used for said radiofrequency signal is carried out bandpass filtering treatment; To produce said filtering signal, the live width of said resonator and the live width of said input port are different, make the output impedance of said band pass filter and the input impedance of the late-class circuit that said output port is coupled mate each other;
Wherein, said band pass filter is coupled directly to a frequency mixer in a frequency demultiplier; And
Wherein, the input impedance of said late-class circuit be said late-class circuit measure the input impedance during lowest noise.
13. band pass filter as claimed in claim 12; Wherein said resonator comprises near one first section portion of said input port and one second section portion of approaching said output port; The live width of said first section portion and the live width of said input port are different, and the live width of the live width of said first section portion and said second section portion is different.
14. band pass filter as claimed in claim 13, wherein said band pass filter are a hairpin-line bandpass filter or a parallel strap bandpass filter.
15. band pass filter as claimed in claim 12, wherein said band pass filter are a terminal strap bandpass filter.
16. a frequency demultiplier that is used for a wireless communication receiver comprises:
One frequency mixer is used for according to a local oscillated signal, and the frequency of a filtering signal is carried out down conversion process, to export an intermediate-freuqncy signal; And
One band pass filter directly is coupled to said frequency mixer, and said band pass filter comprises:
One input port is used for receiving a radiofrequency signal;
One output port is used for exporting a filtering signal; And
A plurality of resonators; Be located between said input port and the said output port; Be used for said radiofrequency signal is carried out bandpass filtering treatment; To produce said filtering signal, said a plurality of resonators have at least two kinds of different live widths, make the output impedance of said band pass filter and the input impedance of the late-class circuit that said output port is coupled mate each other;
Wherein, the input impedance of said late-class circuit be said late-class circuit measure the input impedance during lowest noise.
17. frequency demultiplier as claimed in claim 16; Each resonator of wherein said a plurality of resonators comprises one first section portion of approaching said output port and one second section portion of approaching said input port, and the live width of the live width of said first section portion and said second section portion is different.
18. frequency demultiplier as claimed in claim 17, the live width of wherein said first section portion is greater than the live width of said second section portion.
19. frequency demultiplier as claimed in claim 16, a resonator comprises a plurality of sections portions that live width is different in wherein said a plurality of resonators.
20. frequency demultiplier as claimed in claim 16, the live width of two adjacent resonators is different in wherein said a plurality of resonators.
21. frequency demultiplier as claimed in claim 16, in wherein said a plurality of resonators in the two adjacent resonators, near the live width of a resonator of said output port greater than near the live width of another resonator of said input port.
22. frequency demultiplier as claimed in claim 16, wherein said band pass filter are a hairpin-line bandpass filter.
23. frequency demultiplier as claimed in claim 22, wherein said band pass filter comprise a plurality of U type resonators, the opening direction of the opening direction of a U type resonator and adjacent another U type resonator is different in said a plurality of U type resonators.
24. frequency demultiplier as claimed in claim 22, wherein said band pass filter comprise a plurality of U type resonators, the opening direction of a U type resonator is identical with the opening direction of adjacent another U type resonator in said a plurality of U type resonators.
25. frequency demultiplier as claimed in claim 16, wherein said band pass filter are a parallel strap bandpass filter.
26. frequency demultiplier as claimed in claim 16, wherein said band pass filter are a terminal strap bandpass filter.
27. a frequency demultiplier that is used for a wireless communication receiver comprises:
One frequency mixer is used for according to a local oscillated signal, and the frequency of a filtering signal is carried out down conversion process, to export an intermediate-freuqncy signal; And
One band pass filter directly is coupled to said frequency mixer, and said band pass filter comprises:
One input port is used for receiving a radiofrequency signal;
One output port is used for exporting a filtering signal; And
One resonator; Be located between said input port and the said output port; Be used for said radiofrequency signal is carried out bandpass filtering treatment; To produce said filtering signal, the live width of said resonator and the live width of said input port are different, make the output impedance of said band pass filter and the input impedance of the late-class circuit that said output port is coupled mate each other;
Wherein, the input impedance of said late-class circuit be said late-class circuit measure the input impedance during lowest noise.
28. frequency demultiplier as claimed in claim 27; Wherein said resonator comprises near one first section portion of said input port and one second section portion of approaching said output port; The live width of said first section portion and the live width of said input port are different, and the live width of the live width of said first section portion and said second section portion is different.
29. frequency demultiplier as claimed in claim 28, wherein said band pass filter are a hairpin-line bandpass filter or a parallel strap bandpass filter.
30. frequency demultiplier as claimed in claim 27, wherein said band pass filter are a terminal strap bandpass filter.
CN 200910143956 2009-06-04 2009-06-04 Self-adaptive bandpass filter and related down converter thereof Active CN101908663B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200910143956 CN101908663B (en) 2009-06-04 2009-06-04 Self-adaptive bandpass filter and related down converter thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200910143956 CN101908663B (en) 2009-06-04 2009-06-04 Self-adaptive bandpass filter and related down converter thereof

Publications (2)

Publication Number Publication Date
CN101908663A CN101908663A (en) 2010-12-08
CN101908663B true CN101908663B (en) 2012-12-19

Family

ID=43264043

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200910143956 Active CN101908663B (en) 2009-06-04 2009-06-04 Self-adaptive bandpass filter and related down converter thereof

Country Status (1)

Country Link
CN (1) CN101908663B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109687064A (en) * 2018-12-19 2019-04-26 贵州航天电子科技有限公司 A kind of novel micro strip line type bandpass filter
CN110197940B (en) * 2019-06-13 2021-10-08 中国电子科技集团公司第二十九研究所 Improved hairpin line filter and operation method thereof
CN112332051B (en) * 2020-10-27 2021-08-27 广州天极电子科技股份有限公司 Ultra-wideband filter
CN113471650A (en) * 2021-05-21 2021-10-01 西安电子科技大学 Glass-based millimeter wave interdigital microstrip filter and duplexer structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1523780A (en) * 2003-02-21 2004-08-25 清华大学 Coupling structure of high-temperature superconductive filter for adjusting-free satellite communication and making process
CN1885710A (en) * 2005-06-21 2006-12-27 启碁科技股份有限公司 Low noise frequency demultiplier
CN101425615A (en) * 2007-11-02 2009-05-06 海泰超导通讯科技（天津）有限公司 Step resistance type hair-pin structure resonator and filter thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004114455A1 (en) * 2003-06-18 2004-12-29 Murata Manufacturing Co., Ltd. Resonator, filter and communication unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1523780A (en) * 2003-02-21 2004-08-25 清华大学 Coupling structure of high-temperature superconductive filter for adjusting-free satellite communication and making process
CN1885710A (en) * 2005-06-21 2006-12-27 启碁科技股份有限公司 Low noise frequency demultiplier
CN101425615A (en) * 2007-11-02 2009-05-06 海泰超导通讯科技（天津）有限公司 Step resistance type hair-pin structure resonator and filter thereof

Also Published As

Publication number Publication date
CN101908663A (en) 2010-12-08

Similar Documents

Publication Publication Date Title
US7116960B2 (en) Image-rejecting antenna apparatus
US6512427B2 (en) Spurious signal reduction circuit
US7971756B2 (en) Filtering device and related wireless communication receiver
JP2021525482A (en) Wideband Low Noise Amplifier (LNA) with Reconfigurable Bandwidth for Millimeter Wave 5G Communication
US8063724B2 (en) Self-matching band-pass filter and related frequency down converter
US20030083034A1 (en) Low noise block downconverter converting received signal to intermediate frequency signal
CN101908663B (en) Self-adaptive bandpass filter and related down converter thereof
EP1447906B1 (en) Dual gate low noise amplifier
JPH1098406A (en) Improved low noise block down converter
CN218217346U (en) Radio frequency receiving module for satellite signal acquisition
CN101714877A (en) Filter and related wireless communication receiver
CN209676220U (en) A kind of multi-standard amplifier for automobile radio system
CN114050791A (en) Multi-octave broadband frequency conversion assembly
JP3759693B2 (en) Noise filter and high-frequency transmitter using the same
CN206922743U (en) Integrated Ka wave band antennas front end
KR100729969B1 (en) Repeater having dielectric band stop resonators
CN105119573A (en) Microwave frequency conversion power division circuit
US20070129028A1 (en) Radio-frequency circuit realizing stable operation
CN115276568B (en) Miniaturized filtering low-noise amplifier and receiver
CN202160173U (en) Front-end micro-strip filter of receiver
CN210405294U (en) Radio frequency communication front end
US20240072406A1 (en) Signal processing circuit and distribution circuit
CN108306653B (en) Radio frequency front end module, integrated radio frequency receiver chip and control method
JP2007235433A (en) Low-noise block converter
KR0128563Y1 (en) Signal dividing circuit of tuner for satellite broadcasting

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant