CN103281096B - Filter and related wireless communication receiver thereof - Google Patents
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- CN103281096B CN103281096B CN201310086930.9A CN201310086930A CN103281096B CN 103281096 B CN103281096 B CN 103281096B CN 201310086930 A CN201310086930 A CN 201310086930A CN 103281096 B CN103281096 B CN 103281096B
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Abstract
The invention discloses filter and related wireless communication receiver thereof.Filter comprises: insulated substrate, comprises first surface and second; Microstrip transmission line, is laid on the first surface of insulated substrate, is used for signal transmission; And ground metal layer, be laid on second of insulated substrate, be used to provide ground connection.Wireless communication receiver comprises: antenna, is used for receiving wireless signal; Waveguide, is coupled to antenna, is used for strengthening the electric wave of special frequency band in wireless signal; Frequency demultiplier, is used for reducing the frequency of signal received, to export intermediate-freuqncy signal; Baseband processor, is used for processing intermediate-freuqncy signal; And filter.In ground metal layer, immediately below the block of microstrip transmission line, form meander configuration resonant cavity, be used for producing stop-band.Coated housing in ground metal layer, corresponds to the position of meander configuration resonant cavity and is formed and escapes material space in this housing, this escapes the area that area that material space is projected in second of insulated substrate is greater than meander configuration resonant cavity.
Description
The divisional application that the application is application number is 200810169811.9, the applying date is on October 7th, 2008, application people is Qiqi Science and Technology Co., Ltd., denomination of invention is the Chinese invention patent application of " filter and related wireless communication receiver thereof ".
Technical field
The present invention is a kind of filter and related wireless communication receiver thereof, particularly a kind of filter and related wireless communication receiver thereof reducing circuit layout area and higher adjustability.
Background technology
Superheterodyne receiver (SuperHeterodyneReceiver) is the most widely used wireless communication receiver of one, and it simply can perform carrier frequency tuning (i.e. channel selection), filtering and signal and amplify.In superheterodyne receiver, signal receives through amplification, rf filtering from antenna, be down to intermediate frequency, amplify and filtering through one or more intermediate frequency, is finally down to fundamental frequency and does signal receiving process.Wherein, be down in the process of intermediate frequency by radio frequency, be often subject to the impact that image frequency (ImageFrequency) is disturbed, cause follow-up signal process generation problem.
Please refer to Fig. 1, Fig. 1 is the schematic diagram being conventionally used to a superheterodyne receiver 10.Superheterodyne receiver 10 comprises antenna 100, low noise amplifier 102, image cancellation filter (ImageRejectFilter) 104, frequency mixer 106, local oscillator (LocalOscillator) 108, mid-frequency low-pass filter 110 and an intermediate frequency amplifier 112.The working method of superheterodyne receiver 10 is summarized as follows.After radiofrequency signal VRF1 is received by antenna 100, amplify through low noise amplifier 102 and become radiofrequency signal VRF2; Then, image frequency signal in image cancellation filter 104 filtering radiofrequency signal VRF2, to produce rf filtering signal VFRF, then be downconverted to intermediate-frequency band through frequency mixer 106, and amplify rear output intermediate-freuqncy signal VIF by mid-frequency low-pass filter 110 filtering and intermediate frequency amplifier 112.Wherein, image cancellation filter 104 is used for eliminating image frequency interference.Image frequency Producing reason is: two incoming frequencies | fLO ± fIF|, can export at frequency mixer 106 and produce frequency f IF; Wherein, frequency f LO is the oscillation signal frequency of local oscillator 108, and frequency f IF is the frequency of intermediate-freuqncy signal VIF.Therefore, in superheterodyne receiver 10, frequency spectrum is symmetrical in the signal of local oscillated signal both sides when frequency mixer 106, identical frequency band can be entered into, form a kind of interference signal, reduce signal to noise ratio (SignaltoInterferenceRatio, C/IRatio), and the signal polluted for receiving, so that affect the reception of superheterodyne receiver 10.In the face of the problem of image frequency interference, the most frequently used method is before frequency mixer 106, add a band pass filter, i.e. image cancellation filter 104, in order to first interference signal filtering is entered in frequency mixer 106 again, minimum interference to be down to.
In the conventional technology, the implementation of image cancellation filter 104 has many kinds, such as hairpin-line bandpass filter (HairpinBandPassFilter) or parallel coupled line filter (parallel-coupledlinefilter) etc.Please refer to Fig. 2, Fig. 2 is the schematic diagram of a traditional hairpin-line bandpass filter 20.Hairpin-line bandpass filter 20 is lateral symmetry formula (TransverseSymmetry) framework, and it comprises microstrip line (Micro-stripLine) connector IO_a, IO_b and resonator RSN_1 ~ RSN_n.Microstrip line port IO_a, IO_b are connected to forward and backward level circuit, in order to receive and output signal.The overall length of each resonator of resonator RSN_1 ~ RSN_n is approximately the half for the signal wavelength received, and its number n represents the exponent number (Order) of hairpin-line bandpass filter 20, and designer can according to the size of different Demand Design n.
Therefore, by adjusting the characteristic such as overall length, number, width of each resonator, hairpin-line bandpass filter 20 can reach suitable anti-image frequency effect.But in hairpin-line bandpass filter 20, each resonator is folding type (or hairpin-type) structure, thus can take larger board area, makes cost increase thereupon.What is more, and hairpin-line bandpass filter 20 is poor at the noise inhibiting ability near passband (PassBand) both sides.In other words, if during the closer radio frequency band of noise, then may enter in circuit, cause interference.In this case, conventional art can use the matching network of microstrip line, as quarter-wave open circuit stub (OpenStub), produces another stop-band, with restraint speckle.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of a microstrip line open circuit stub framework 30.Microstrip line open circuit stub framework 30 is on transmission path (namely input port PT_i is to output port PT_o), extends the open circuit stub 300 of an open-end, to produce another stop-band frequency range.But the stop-band frequency range that open circuit stub 300 produces is about about 30%, and the efficiency reducing frequency range is poor.For example, please refer to Fig. 4 and Fig. 5, Fig. 4 and Fig. 5 is the schematic diagram of open circuit stub 300 penetrating coefficient and suppression frequency range frequency range under different live width.In the diagram, when curve TP_1 ~ TP_5 represents that the live width of open circuit stub 300 is 0.1mm, 0.15mm, 0.2mm, 0.25mm and 0.3mm respectively, the curve of penetrating coefficient; And in Figure 5, when curve TP_HM and BW_RJ represents that the live width of open circuit stub 300 is 0.1mm, 0.15mm, 0.2mm, 0.25mm and 0.3mm respectively, the curve of resonance point penetrating coefficient and suppression frequency range frequency range.Therefore, from Fig. 4 and Fig. 5, it is poor that open circuit stub 300 reduces the efficiency of frequency range, and in other words, microstrip line open circuit stub framework 30 is not good for the noise filtering ability near radio frequency band, cannot effective filtering noise.
Summary of the invention
Therefore, namely main purpose of the present invention is to provide a kind of filter and related wireless communication receiver thereof.
The present invention discloses a kind of filter, comprises an insulated substrate, comprises a first surface and one second; One microstrip transmission line, is laid on this first surface of this insulated substrate, is used for signal transmission; And a ground metal layer, be laid on this second of this insulated substrate, be used to provide ground connection; Wherein, the block corresponding to this microstrip line in this ground metal layer is formed with a meander configuration resonant cavity, is used for producing a stop-band on this microstrip transmission line.
The present invention also discloses a kind of wireless communication receiver, comprises an antenna, is used for reception one wireless signal; One waveguide, is coupled to this antenna, is used for strengthening the electric wave of a special frequency band in this wireless signal; One frequency demultiplier, is used for reducing the frequency of signal received, to export an intermediate-freuqncy signal; One Baseband processor, is used for processing this intermediate-freuqncy signal; And a filter, it comprises an insulated substrate, comprises a first surface and one second; One microstrip transmission line, is laid on this first surface of this insulated substrate, and is coupled between this waveguide and this frequency demultiplier, is used for signal transmission; And a ground metal layer, be laid on this second of this insulated substrate, be used to provide ground connection; Wherein, the block corresponding to this microstrip line in this ground metal layer is formed with a meander configuration resonant cavity, is used for producing a stop-band on this microstrip transmission line.
According to an aspect of the present invention, provide a kind of filter, comprising: an insulated substrate, comprise a first surface and one second; One microstrip transmission line, is laid on this first surface of this insulated substrate, is used for signal transmission; And a ground metal layer, be laid on this second of this insulated substrate, be used to provide ground connection; Wherein, in this ground metal layer, immediately below a block of microstrip transmission line, form a meander configuration resonant cavity, be used for generation one stop-band; Wherein, a coated housing in this ground metal layer, corresponds to the position of this meander configuration resonant cavity and is formed and escapes material space in this housing, and this escapes the area that this area of second that material space is projected in this insulated substrate is greater than this meander configuration resonant cavity.
According to a further aspect in the invention, provide a kind of filter, comprising: an insulated substrate, comprise a first surface and one second; One microstrip transmission line, is laid on this first surface of this insulated substrate, is used for signal transmission; And a ground metal layer, be laid on this second of this insulated substrate, be used to provide ground connection; Wherein, in this ground metal layer, immediately below a block of microstrip transmission line, form a meander configuration resonant cavity, be used for generation one stop-band; Wherein, a coated housing in this ground metal layer, the position corresponding to this meander configuration resonant cavity in this housing is formed escapes material space, and the centre frequency of this degree of depth and this stop-band of escaping material space is inverse ratio.
According to another aspect of the invention, provide a kind of wireless communication receiver, comprising: an antenna, be used for reception one wireless signal; One waveguide, is coupled to this antenna, is used for strengthening the electric wave of a special frequency band in this wireless signal; One frequency demultiplier, is used for reducing the frequency of signal received, to export an intermediate-freuqncy signal; One Baseband processor, is used for processing this intermediate-freuqncy signal; And a filter, it comprises: an insulated substrate, comprises a first surface and one second; One microstrip transmission line, is laid on this first surface of this insulated substrate, and is coupled between this waveguide and this frequency demultiplier, is used for signal transmission; With a ground metal layer, be laid on this second of this insulated substrate, be used to provide ground connection; Wherein, in this ground metal layer, immediately below a block of microstrip transmission line, form a meander configuration resonant cavity, be used for generation one stop-band; Wherein, a coated housing in this ground metal layer, corresponds to the position of this meander configuration resonant cavity and is formed and escapes material space in this housing, and this escapes the area that this area of second that material space is projected in this insulated substrate is greater than this meander configuration resonant cavity.
In accordance with a further aspect of the present invention, provide a kind of wireless communication receiver, comprising: an antenna, be used for reception one wireless signal; One waveguide, is coupled to this antenna, is used for strengthening the electric wave of a special frequency band in this wireless signal; One frequency demultiplier, is used for reducing the frequency of signal received, to export an intermediate-freuqncy signal; One Baseband processor, is used for processing this intermediate-freuqncy signal; And a filter, it comprises: an insulated substrate, comprises a first surface and one second; One microstrip transmission line, is laid on this first surface of this insulated substrate, and is coupled between this waveguide and this frequency demultiplier, is used for signal transmission; With a ground metal layer, be laid on this second of this insulated substrate, be used to provide ground connection; Wherein, in this ground metal layer, immediately below a block of microstrip transmission line, form a meander configuration resonant cavity, be used for generation one stop-band; Wherein, a coated housing in this ground metal layer, the position corresponding to this meander configuration resonant cavity in this housing is formed escapes material space, and the centre frequency of this degree of depth and this stop-band of escaping material space is inverse ratio.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the frequency demultiplier being conventionally used to a superheterodyne receiver.
Fig. 2 is the schematic diagram of a traditional hairpin-line bandpass filter.
Fig. 3 is the schematic diagram of a traditional microstrip line open circuit stub framework.
Fig. 4 is the schematic diagram of open circuit stub penetrating coefficient under different live width of Fig. 3.
Fig. 5 is the schematic diagram that the open circuit stub of Fig. 3 suppresses frequency range frequency range under different live width.
Fig. 6 A is the exploded side perspective view of the embodiment of the present invention one filter.
Fig. 6 B is the upper viewing view of the filter of Fig. 6 A.
Fig. 6 C is the lower planar view of the filter of Fig. 6 A.
Fig. 7 is the schematic diagram of filter penetrating coefficient under the spacing of different meander configuration resonant cavity of Fig. 6 A.
Fig. 8 is the schematic diagram that the filter of Fig. 6 A suppresses frequency range frequency range under the spacing of different meander configuration resonant cavity.
Fig. 9 is the comparison diagram that a suppression frequency range frequency range curve of microstrip line open circuit stub framework of Fig. 3 and of the filter of Fig. 6 A suppress frequency range frequency range curve.
Figure 10 A is the schematic diagram of the coated housing in the bottom of the filter of Fig. 6 A.
Figure 10 B is the schematic diagram of the housing of Figure 10 A.
Figure 11 is under difference escapes the degree of depth of material space, the schematic diagram of the penetrating coefficient of the filter of Fig. 6 A.
Figure 12 is the schematic diagram of the embodiment of the present invention one wireless communication receiver.
Main element symbol description
10 superheterodyne receivers
100 antennas
102 low noise amplifiers
104 image cancellation filters
106 frequency mixers
108 local oscillators
110 mid-frequency low-pass filters
112 intermediate frequency amplifiers
VRF1, VRF2 radiofrequency signal
VFRF rf wave signal
VIF intermediate-freuqncy signal
20 hairpin-line bandpass filters
IO_a, IO_b microstrip line port
RSN_1 ~ RSN_n, IRSN_1 ~ IRSN_n resonator
30 microstrip line open circuit stub frameworks
300 open circuit stubs
PT_i input port
PT_o output port
600,602 arrows
60 filters
604 insulated substrates
606 microstrip transmission lines
608 ground metal layer
610 meander configuration resonant cavitys
A, A ' block
1000 housings
1002 escape material space
1200 wireless communication receivers
1202 antennas
1204 waveguides
1206 frequency demultipliers
1208 Baseband processor
TP_1 ~ TP_5, TP_HM, BW_RJ, ITP_1 ~ ITP_5, ITP_HM, IBW_RJ, OPS_BW, DGS_BW, HTP_1 ~ HTP_3 curve
Embodiment
Please refer to Fig. 6 A to Fig. 6 C, Fig. 6 A is the exploded side perspective view of the embodiment of the present invention one filter 60, and Fig. 6 B is the upper viewing view of filter 60, and Fig. 6 C is the lower planar view of filter 60.Wherein, for correctly the present invention being described, Fig. 6 A to Fig. 6 C uses arrow 600,602, and the view directions being relevant to filter 60 is described.Filter 60 comprises insulated substrate 604, microstrip transmission line 606 and a ground metal layer 608.Microstrip transmission line 606 and ground metal layer 608 are respectively formed at the upper and lower faces of filter 60, in order to signal transmission and provide ground connection.In ground metal layer 608, one block A ' is corresponding to microstrip transmission line 606 Zhong-1 block block A, it is formed, and (or etching) has a meander configuration (meander-shaped) resonant cavity 610, in order to produce a stop-band on microstrip transmission line 606.In simple terms, immediately below block A form meander configuration resonant cavity 610 and be used for generation one stop-band, make filter 60 can filter the signal of special frequency band.
In filter 60, the meander configuration resonant cavity 610 immediately below microstrip transmission line 606 is equivalent to the parallel circuits of a resistance, an electric capacity and an inductance.In other words, as long as suitably adjust the spacing, overall length etc. of meander configuration resonant cavity 610, i.e. the frequency range, centre frequency, resonance point penetrating coefficient etc. of adjustable stop-band.For example, please refer to Fig. 7 and Fig. 8, Fig. 7 and Fig. 8 is the schematic diagram of filter 60 penetrating coefficient and suppression frequency range frequency range under the spacing of different meander configuration resonant cavity 610.In the figure 7, when curve ITP_1 ~ ITP_5 represents that the spacing of meander configuration resonant cavity 610 is 0.1mm, 0.15mm, 0.2mm, 0.25mm and 0.3mm respectively, the curve of the penetrating coefficient of filter 60; And in fig. 8, when curve ITP_HM and IBW_RJ represents that the spacing of meander configuration resonant cavity 610 is 0.1mm, 0.15mm, 0.2mm, 0.25mm and 0.3mm respectively, the resonance point penetrating coefficient of filter 60 and the curve of suppression frequency range frequency range.As shown in Figure 7, when the pitch smaller of meander configuration resonant cavity 610, the stop-band of filter 60 also and then diminishes, mainly due to when the pitch smaller of meander configuration resonant cavity 610, capacitive character can strengthen, and the frequency range of stop-band is relevant to the inverse of equivalent resistance and electric capacity product, so the frequency range of stop-band also and then diminishes.In addition, as shown in Figure 8, when the pitch smaller of meander configuration resonant cavity 610, then the frequency range meeting rapid drop of stop-band, such as, when the spacing of meander configuration resonant cavity 610 is down to 0.10mm from 0.30mm, the frequency range of stop-band reduces about 17%.As can be seen from the curve IBW_RJ of Fig. 8, the spacing of meander configuration resonant cavity 610 and the frequency range of stop-band proportional, and as can be seen from the curve ITP_HM of Fig. 8, the spacing of meander configuration resonant cavity 610 and the resonance point penetrating coefficient of filter are inverse ratio.Stub framework 30 of opening a way with the microstrip line of Fig. 3 further compares, and please refer to Fig. 9, and Fig. 9 is the comparison diagram of the suppression frequency range frequency range curve OPS_BW of microstrip line open circuit stub framework 30 and the suppression frequency range frequency range curve D GS_BW of filter 60.As shown in Figure 9, the frequency range of the stop-band of filter 60 reduces the twice that speed is about microstrip line open circuit stub framework 30.In other words, as long as suitably adjust the spacing of meander configuration resonant cavity 610, the frequency range of stop-band can effectively be adjusted.In this case, those skilled in the art can use filter 60, subband bandpass filter, to increase its rejection ability, or is embedded in filtering noise bottom microstrip line.
On the other hand, when realizing filter 60, meeting coated housing in ground metal layer 608 usually.Please refer to the schematic diagram that Figure 10 A and Figure 10 B, Figure 10 A is the coated housing 1000 in bottom of filter 60, Figure 10 B is the schematic diagram of housing 1000.Because ground metal layer 608 is formed with meander configuration resonant cavity 610, therefore, housing 1000 needs to comprise and escapes material space 1002, its area being projected in insulated substrate 604 need be greater than the area of meander configuration resonant cavity 610, to maintain its normal operation.In addition, the degree of depth escaping material space 1002 can change inductance and the capacitance of the equivalent electric circuit of meander configuration resonant cavity 610, and such as, Figure 11 is under difference escapes the degree of depth of material space 1002, the schematic diagram of the penetrating coefficient of filter 60.In fig. 11, when curve HTP_1 ~ HTP_3 represents that the degree of depth escaping material space 1002 is 0.5mm, 1.0mm and 2.0mm respectively, the curve of the penetrating coefficient of filter 60.Therefore, when the degree of depth escaping material space 1002 is more shallow, the centre frequency of the cut-off frequency of filter 60 can more toward high frequency offset.Thus, as long as suitably the degree of depth of material space 1002 is escaped in adjustment, i.e. the centre frequency of the cut-off frequency of adjustable filter 60.
Therefore, from the above, by the spacing of adjustment meander configuration resonant cavity 610, overall length or the degree of depth escaping material space 1002, i.e. the characteristic such as frequency range, centre frequency, resonance point penetrating coefficient of adjustable stop-band.In other words, ability tool knows that the knowledgeable according to different demand, can reach required filtering characteristic easily usually.Certainly, except above-mentioned adjustment mode, also can the adjustment mode common with industry be combined, with the adjustability of boostfiltering device 60.Such as, in wireless radio-frequency, adjustment screw (TuningScrew) is a kind of technology being often used to finely tune microstrip line capacitance size, and it changes the equivalent capacity between resonant circuit and adjustment screw by rotating adjustment screw, and then adjustment filtering characteristic.The mode of this Use Adjustment screw also can be used in the present invention, to promote adjustability.
As previously mentioned, meander configuration resonant cavity 610 is equivalent to the parallel circuits of resistance, electric capacity and inductance, and this kind of equivalent electric circuit has higher Q value, so frequency range can be narrower, thus can suppress the noise near radio frequency band easily.By these characteristic, if be suitably applied in wireless communication receiver by filter 60, then can replace band pass filter (hairpin-line bandpass filter 20 as shown in Figure 2).Please refer to Figure 12, Figure 12 is the schematic diagram of the embodiment of the present invention one wireless communication receiver 1200.Wireless communication receiver 1200 uses the filter 60 of Fig. 6 A, and comprises antenna 1202, waveguide 1204, frequency demultiplier 1206 and a Baseband processor 1208.The working method of wireless communication receiver 1200 is summarized as follows.Radiofrequency signal is strengthened the electric wave of characteristic frequency after being received by antenna 1202 by waveguide 1204; Then, filter 60 filtering image frequency signal of the present invention, then be downconverted to intermediate-frequency band through frequency demultiplier 1206, to carry out subsequent treatment by Baseband processor 1208.In simple terms, wireless communication receiver 1200 replaces band pass filter with waveguide 1204 and filter 60.Because filter 60 is except possessing narrower stop-band, also possess that volume is little, low cost and other advantages, and be easily embedded in microstrip circuit, therefore can circuit layout area be reduced, and improve circuit performance and reduce costs.
Should be noted, Figure 12 is only the schematic diagram of wireless communication receiver 1200, and in fact, wireless communication receiver 1200 may comprise other element, as low noise amplifier, mid-frequency low-pass filter, intermediate frequency amplifier etc., and those skilled in the art is when doing suitable change according to needed for it.
In sum, the present invention is the ground metal layer immediately below microstrip transmission line, forms meander configuration resonant cavity, to produce stop-band, makes filter filter the signal of special frequency band.Therefore, filter of the present invention, except possessing narrower stop-band, also possesses that volume is little, low cost and other advantages, and is easily embedded in microstrip circuit, therefore can reduce circuit layout area, and improves circuit performance and reduce costs.The more important thing is, the adjustability of filter of the present invention is higher, and by multiple adjustment mode, its filtering characteristic of appropriateness adjustment, to reach system requirements.
The foregoing is only the preferred embodiments of the present invention, all equalizations done according to the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (14)
1. a filter, comprising:
One insulated substrate, comprises a first surface and one second;
One microstrip transmission line, is laid on this first surface of this insulated substrate, is used for signal transmission; And
One ground metal layer, is laid on this second of this insulated substrate, is used to provide ground connection;
Wherein, in this ground metal layer, immediately below a block of microstrip transmission line, form a meander configuration resonant cavity, be used for generation one stop-band;
Wherein, a coated housing in this ground metal layer, corresponds to the position of this meander configuration resonant cavity and is formed and escapes material space in this housing, and this escapes the area that this area of second that material space is projected in this insulated substrate is greater than this meander configuration resonant cavity.
2. a filter, comprising:
One insulated substrate, comprises a first surface and one second;
One microstrip transmission line, is laid on this first surface of this insulated substrate, is used for signal transmission; And
One ground metal layer, is laid on this second of this insulated substrate, is used to provide ground connection;
Wherein, in this ground metal layer, immediately below a block of microstrip transmission line, form a meander configuration resonant cavity, be used for generation one stop-band;
Wherein, a coated housing in this ground metal layer, the position corresponding to this meander configuration resonant cavity in this housing is formed escapes material space, and the centre frequency of this degree of depth and this stop-band of escaping material space is inverse ratio.
3. filter according to claim 1 and 2, wherein this meander configuration resonant cavity is equivalent to the parallel circuits of a resistance, an electric capacity and an inductance.
4. filter according to claim 1 and 2, wherein the spacing of this meander configuration resonant cavity and the frequency range of this stop-band proportional.
5. filter according to claim 1 and 2, wherein the spacing of this meander configuration resonant cavity and the resonance point penetrating coefficient of this filter are inverse ratio.
6. filter according to claim 1 and 2, wherein the total length of this meander configuration resonant cavity is relevant to the centre frequency of this stop-band.
7. filter according to claim 1 and 2, wherein this meander configuration resonant cavity is formed in this ground metal layer with etching mode.
8. a wireless communication receiver, comprising:
One antenna, is used for reception one wireless signal;
One waveguide, is coupled to this antenna, is used for strengthening the electric wave of a special frequency band in this wireless signal;
One frequency demultiplier, is used for reducing the frequency of signal received, to export an intermediate-freuqncy signal;
One Baseband processor, is used for processing this intermediate-freuqncy signal; And
One filter, it comprises:
One insulated substrate, comprises a first surface and one second;
One microstrip transmission line, is laid on this first surface of this insulated substrate, and is coupled between this waveguide and this frequency demultiplier, is used for signal transmission; And
One ground metal layer, is laid on this second of this insulated substrate, is used to provide ground connection;
Wherein, in this ground metal layer, immediately below a block of microstrip transmission line, form a meander configuration resonant cavity, be used for generation one stop-band;
Wherein, a coated housing in this ground metal layer, corresponds to the position of this meander configuration resonant cavity and is formed and escapes material space in this housing, and this escapes the area that this area of second that material space is projected in this insulated substrate is greater than this meander configuration resonant cavity.
9. a wireless communication receiver, comprising:
One antenna, is used for reception one wireless signal;
One waveguide, is coupled to this antenna, is used for strengthening the electric wave of a special frequency band in this wireless signal;
One frequency demultiplier, is used for reducing the frequency of signal received, to export an intermediate-freuqncy signal;
One Baseband processor, is used for processing this intermediate-freuqncy signal; And
One filter, it comprises:
One insulated substrate, comprises a first surface and one second;
One microstrip transmission line, is laid on this first surface of this insulated substrate, and is coupled between this waveguide and this frequency demultiplier, is used for signal transmission; And
One ground metal layer, is laid on this second of this insulated substrate, is used to provide ground connection;
Wherein, in this ground metal layer, immediately below a block of microstrip transmission line, form a meander configuration resonant cavity, be used for generation one stop-band;
Wherein, a coated housing in this ground metal layer, the position corresponding to this meander configuration resonant cavity in this housing is formed escapes material space, and the centre frequency of this degree of depth and this stop-band of escaping material space is inverse ratio.
10. wireless communication receiver according to claim 8 or claim 9, wherein this meander configuration resonant cavity is equivalent to the parallel circuits of a resistance, an electric capacity and an inductance.
11. wireless communication receivers according to claim 8 or claim 9, wherein the spacing of this meander configuration resonant cavity and the frequency range of this stop-band proportional.
12. wireless communication receivers according to claim 8 or claim 9, wherein the spacing of this meander configuration resonant cavity and the resonance point penetrating coefficient of this filter are inverse ratio.
13. wireless communication receivers according to claim 8 or claim 9, wherein the total length of this meander configuration resonant cavity is relevant to the centre frequency of this stop-band.
14. wireless communication receivers according to claim 8 or claim 9, wherein this meander configuration resonant cavity is formed in this ground metal layer with etching mode.
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| CN 200810169811 CN101714877B (en) | 2008-10-07 | 2008-10-07 | Filter and related wireless communication receiver |
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| CN102315853A (en) * | 2010-07-07 | 2012-01-11 | 启碁科技股份有限公司 | Radio frequency device |
| US9673499B2 (en) | 2015-08-28 | 2017-06-06 | King Abdulaziz City For Science And Technology | Notch filter with arrow-shaped embedded open-circuited stub |
| JP6238257B1 (en) * | 2016-06-28 | 2017-11-29 | 三菱電機株式会社 | Power converter |
| WO2020029183A1 (en) * | 2018-08-09 | 2020-02-13 | 深圳市大富科技股份有限公司 | Filter, duplexer, and communication device |
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| JP3331967B2 (en) * | 1998-06-02 | 2002-10-07 | 松下電器産業株式会社 | Millimeter wave module |
| JP2002033617A (en) * | 2001-06-01 | 2002-01-31 | Mitsubishi Electric Corp | Feeder system |
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| FR2850792A1 (en) * | 2003-02-03 | 2004-08-06 | Thomson Licensing Sa | COMPACT WAVEGUIDE FILTER |
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- 2008-10-07 CN CN 200810169811 patent/CN101714877B/en active Active
- 2008-10-07 CN CN201310086930.9A patent/CN103281096B/en active Active
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| CN86105806A (en) * | 1985-07-22 | 1987-01-21 | 日本电气株式会社 | Dielectric resonant chamber filter |
| JP2002033690A (en) * | 2000-07-13 | 2002-01-31 | Gcomm Corp | Very weak radio wave communication system |
| CN2809909Y (en) * | 2004-05-18 | 2006-08-23 | 威盛电子股份有限公司 | Parallel-coupling line form filter |
| CN1901274A (en) * | 2006-07-27 | 2007-01-24 | 上海交通大学 | Super wide band plane microstrip filter |
| CN1913220A (en) * | 2006-08-28 | 2007-02-14 | 同济大学 | Three-D resonant cavity capable of reducing cut-off frequency |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101714877A (en) | 2010-05-26 |
| CN101714877B (en) | 2013-08-21 |
| CN103281096A (en) | 2013-09-04 |
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