CN110165343A - A kind of radio-frequency filter - Google Patents
A kind of radio-frequency filter Download PDFInfo
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- CN110165343A CN110165343A CN201810144420.5A CN201810144420A CN110165343A CN 110165343 A CN110165343 A CN 110165343A CN 201810144420 A CN201810144420 A CN 201810144420A CN 110165343 A CN110165343 A CN 110165343A
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- frequency filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
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- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
The invention discloses a kind of radio-frequency filter, including the first resonator network, the first secondary inductor and the second secondary inductor, the first resonator network for realizing radio frequency band filter passband and stopband function；Wherein, the first secondary inductor, the second secondary inductor are respectively in the input terminal and output end of the first resonator network, for increasing filter passband bandwidth.Above-mentioned technical proposal of the invention, it can be under the premise of guaranteeing that filter passband is functional, filter passband bandwidth or relative bandwidth are effectively increased using less auxiliary induction, while reducing filter size, realizes small size, high-performance, big wide band radio-frequency filter.
Description
Technical field
The present invention relates to technical field of electronic devices, it particularly relates to a kind of radio-frequency filter.
Background technique
Communication technology industry has developed most rapid, most active one of field since being the 1980s, be the mankind into
Enter the important symbol of informationized society.Currently, global radio Communications Market still maintains growing trend, except traditional public is mobile
Outside communication service, the research in broadband wireless communications field is very active, the transmission of short-distance wireless big data is mainly used in, to whole
A wireless communication industry is filled with new vitality.
Direction with modern communication technology towards high speed, broadband, large capacity is developed, and the distribution of limited spectrum resources is increasingly
Anxiety, in order to not interfere with each other various communication systems, there is an urgent need to research and develop high performance wideband filter.Filter is various
One of essential important devices in wireless telecommunication system radio-frequency front-end, it can effectively filter out various garbage signals and make an uproar
Sound reduces the signal interference between each communication channel, to ensure the normal work of communication equipment, realizes high quality communication, in turn
Reach the effective use of frequency spectrum resource.Filter generally by relative bandwidth less than 1% is known as narrow band filter, and relative bandwidth exists
Filter between 1% to 20% is known as broadband filter, and relative bandwidth is greater than 20% or filter of the absolute bandwidth greater than 500MHz
Wave device is known as ultra-wide band filter.In general, bandwidth is bigger, then channel capacity is bigger, power consumption is lower, decaying is smaller, data transmission
Efficiency is higher, confidentiality is more preferable.
Meanwhile wireless telecommunications system gradually develops towards portable, multi-functional, high-performance, inexpensive direction, promotes electronics
Component also develops towards the direction of miniaturization, highly integrated, high reliability, high yield, and filter is no exception.Therefore, how
Efficiently, quickly design meet this development trend filter be present filter research in emphasis.Traditional broadband
Filter mostly uses microstrip line or co-planar waveguide technology to realize that volume is larger, is not easy to realize scale of mass production, and be difficult to and other
Electronic component is integrated.Although and the sound wave filtering technique of current main-stream have highly integrated, high performance advantage, it uses one
As filter passband relative bandwidth achieved by structure be generally less than 5%, by each resonator of general structure simultaneously
The bandpass filter that relative bandwidth is greater than 10%, but required auxiliary induction in this method may be implemented in connection or series inductance
Number is more, is unfavorable for controlling filter volume and cost.For this problem, currently no effective solution has been proposed.
Summary of the invention
For big, the at high cost problem of radio-frequency filter volume in the related technology, the present invention proposes a kind of humorous based on sound wave
The rf broadband filter of vibration device, can be realized 10% to 20% relative bandwidth, while guaranteeing good insertion loss and band
Outer inhibition, and with it is small in size, at low cost, can volume production advantage.
The technical scheme of the present invention is realized as follows:
According to an aspect of the invention, there is provided a kind of radio-frequency filter, including the first resonator network, the first auxiliary
Inductor and the second secondary inductor, the first resonator network for realizing radio frequency band filter passband and stopband function
Energy；Wherein, the first resonator network has first node, second node, third node and fourth node, the first auxiliary induction
The both ends of device are connected to first node and second node, the both ends of the second secondary inductor be connected to third node and
Fourth node；First node and second node are input node, and third node and fourth node are output node；Alternatively, first
Node and second node are output node, and third node and fourth node are input node.
In addition, radio-frequency filter further includes the second resonator network and third secondary inductor；Wherein, the second resonator net
First node, the second node of network are connected to the both ends of the second secondary inductor, the third node of the second resonator network,
Fourth node is connected to the both ends of third secondary inductor.
Wherein, the first resonator network includes: the first, second, third, fourth resonator, the first end of the first resonator
First node is all connected to the first end of third resonator, and the first end of the first end of the second resonator and the 4th resonator is equal
It is connected to second node, the second end of the second end of the first resonator and the 4th resonator is all connected to third node, and second is humorous
The second end of device of shaking and the second end of third resonator are all connected to fourth node.
Wherein, the first, second, third, fourth resonator is acoustic resonator.
Optionally, acoustic resonator is thin film bulk acoustic wave resonator, solid-state assembles bulk acoustic wave resonator or surface acoustic wave is humorous
Shake device.
Wherein, first node and second node are respectively connected to the first port I/O of radio-frequency filter, third node and
Four nodes are respectively connected to the 2nd port I/O of radio-frequency filter.
In some embodiments, the passband relative bandwidth of radio-frequency filter is between 10% to 20%.
On the one hand, compared to traditional microstrip line or coplanar waveguide filter technology, the present invention is by using sound wave resonance
Device technology can be improved the integrated level of device, meanwhile, high-performance acoustic resonator can guarantee the excellent performance of filter.Separately
On the one hand, compared to traditional sound wave broadband filter technology, the present invention can effectively be increased by less auxiliary induction
Filter bandwidht.The auxiliary induction metal routing or can be integrated in acoustic resonator chip using discrete component, in encapsulation
Upper realization, thus the volume for being further reduced area shared by inductance, reducing product.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of existing radio frequency sound wave broadband filter；
Fig. 2 is the structural schematic diagram of the radio-frequency filter of one embodiment of the invention；
Fig. 3 is the structural schematic diagram of the radio-frequency filter of another embodiment of the present invention；
Fig. 4 is emulation and the test result schematic diagram of the radio-frequency filter of one embodiment of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
Fig. 1 is the structural schematic diagram of existing radio frequency sound wave broadband filter 100, and radio-frequency filter 100 includes a sound
Wave resonator network and four auxiliary inductions L121, L122, L123 and L124.Acoustic resonator network has difference-difference lattice
Type structure, acoustic resonator S111, the S112 and two acoustic resonator P111, P112 being connected in parallel being connected in series by two
It constitutes, wherein acoustic resonator P111 and P112 intersects, but intersection is not electrically connected.Any of two ends I/O
It all can serve as the input terminal of radio-frequency filter 100, and another is then used as the output end of radio-frequency filter 100.Auxiliary induction
L121, L122, L123 and L124 respectively with each acoustic resonator S111, S112, P111, P112 in acoustic resonator network
It is connected in parallel, so as to improve the effective electro-mechanical couple factor of each acoustic resonator.Sound wave filtering for specific structure
Device, relative bandwidth is directly proportional to the effective electro-mechanical couple factor of resonator of filter is constituted, and therefore, this structure can increase
Big acoustic wave filter bandwidth.But auxiliary induction quantity is more in this structure, is unfavorable for reducing filter chip volume.
Fig. 2 is the structural schematic diagram of the radio-frequency filter 200 of one embodiment of the invention.Radio-frequency filter 200 includes the
One resonator network 210, the first secondary inductor L221 and the second secondary inductor L222；First resonator network 210 is used
In the passband and stopband function of realizing radio frequency band filter, wherein the first resonator network 210 has first node P, second
Node Q and third node N, fourth node K；Wherein, the both ends of the first secondary inductor L221 are connected to first node P
Third node N and fourth node K are connected to the both ends of second node Q, the second secondary inductor L222.First node and
Second node is input node, and third node and fourth node are output node；Alternatively, first node and second node are output
Node, third node and fourth node are input node.
Wherein, the first secondary inductor L221, the second secondary inductor L222 can pass through discrete component, package substrate
In metal routing or be integrated on resonator network chip realize.
Above-mentioned technical proposal of the invention, by the way that two auxiliary inductions L221, L222 are connected to the first resonator
The input terminal and output end of network 210, reduce the number of half auxiliary induction compared with the prior art, are conducive to reduce encapsulation
Size, and then achieve the purpose that reduce product cost.
With continued reference to shown in Fig. 2, in general, the first resonator network 210 has difference-difference lattice structure, by two
The first resonator S211, the second resonator S212 of a series connection and two the third resonator P211 being connected in parallel, four
Resonator P212 is constituted, and wherein third resonator P211, the 4th resonator P212 intersect, but intersection is not electrically connected.
Specifically, the first resonator network 210 can include: the first resonator S211, the second resonator S212, third resonance
Device P211, the 4th resonator P212.The first end of first resonator S211 and the first end of third resonator P211 are all connected to
First node P, the first end of the second resonator S212 and the first end of the 4th resonator P212 are all connected to second node Q, the
The second end of one resonator S211 and the second end of the 4th resonator P212 are all connected to third node N, the second resonator S212
Second end and the second end of third resonator P211 be all connected to fourth node K.Wherein, the both ends of the first secondary inductor point
It is not connected to first node P and second node Q, the both ends of the second secondary inductor are respectively connected to third node N and the 4th section
Point K.
In addition, two ports I/O shown in Fig. 2 are respectively connected to input terminal and the output of acoustic resonator network 210
End.That is the first node P and second node Q of the first resonator network 210 are respectively connected to the first port I/O of radio-frequency filter
I/O 1, third node N and fourth node K are respectively connected to the 2nd port I/O I/O 2 of radio-frequency filter.It should be appreciated that the
Any of one port I/O I/O 1 and the 2nd port I/O I/O 2 all can serve as the input terminal of radio-frequency filter 200, and
Another is then used as the output end of radio-frequency filter 200.
Wherein, the first resonator S211, the second resonator S212, third resonator P211, the 4th resonator P212 are
Acoustic resonator.By using acoustic resonator technology, filtering can be greatly reduced compared to microstrip line or co-planar waveguide technology
Body product, can be improved the integrated level of device, meanwhile, high performance acoustic resonator can guarantee the excellent performance of filter.
Optionally, acoustic resonator is thin film bulk acoustic wave resonator, solid-state assembles bulk acoustic wave resonator or surface acoustic wave is humorous
Shake device.
Fig. 3 is the structural schematic diagram of the radio-frequency filter 300 of another embodiment of the present invention.Radio-frequency filter 300 includes
First resonator network 310, the first secondary inductor L321 and the second secondary inductor L322, wherein the first resonator network
310 structure to Fig. 2 shows the structure of the first resonator network 210 it is similar, details are not described herein again.First secondary inductor
L321 and the second secondary inductor L322 is connected to the output end and output end of the first resonator network 310.
In the present embodiment, radio-frequency filter 300 further includes the second resonator network 320 and third secondary inductor
L323.Wherein, the first node P of the second resonator network 320, second node Q are connected to the second secondary inductor L322
Both ends, third node N, the fourth node K of the second resonator network 320 are connected to the two of third secondary inductor L323
End.That is, two-stage resonator network can be connected in series, and two at adjacent two-stage resonator network interconnection port
Auxiliary induction merges into an auxiliary induction.
Further, n grades of resonator networks can be connected in series by connection type as described above, n is more than or equal to 2.Its
In, the auxiliary induction at the two-stage resonator network of adjacent connection can be merged into one, therefore, in the radio-frequency filter 300
Auxiliary induction number be n+1.And when existing filter construction (shown in Fig. 1) being used to cascade n grades, auxiliary induction number is
4n, much larger than required auxiliary induction number in the present invention.Therefore, above-mentioned technical proposal of the invention is more advantageous to reduction filter
Design and debugging complexity, reduce filter chip volume.
As shown in figure 4, being emulation and the test result schematic diagram of the radio-frequency filter of one embodiment of the invention, wherein horizontal
Axis indicates frequency, and the longitudinal axis indicates insertion loss (Insertion Loss).The radio-frequency filter is by two resonator network strings
Connection is formed, and altogether includes 3 auxiliary inductions.As shown in Figure 4, centre frequency (f of the radio-frequency filter in 3.25GHzc), it realizes
400MHz bandwidth (BW3dB), relative bandwidth is up to 12% or more.
In some embodiments, the relative bandwidth of radio-frequency filter is between 10% to 20%.
In conclusion the present invention realizes rf broadband filter by using acoustic resonator technology, compared to micro-strip
Line or co-planar waveguide technology can greatly reduce filter volume；And the number by reducing auxiliary induction, reduce filter
The complexity of design and debugging, while filter chip package dimension is further reduced, so that reaching reduces product cost
Purpose, convenient for extensive manufacture.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of radio-frequency filter, which is characterized in that including the first resonator network, the first secondary inductor and the second auxiliary
Inductor, the first resonator network for realizing radio frequency band filter passband and stopband function；
Wherein, the first resonator network has first node, second node, third node and fourth node, the first auxiliary electricity
The both ends of sensor are connected to the first node and the second node, and the both ends of the second secondary inductor are connected to
The third node and the fourth node；
First node and second node are input node, and third node and fourth node are output node；Alternatively, first node and
Second node is output node, and third node and fourth node are input node.
2. radio-frequency filter according to claim 1, which is characterized in that further include the second resonator network and third auxiliary
Inductor；
Wherein, first node, the second node of the second resonator network are connected to the both ends of second secondary inductor,
The third node of second resonator network, fourth node are connected to the both ends of third secondary inductor.
3. radio-frequency filter according to claim 1, which is characterized in that the first resonator network includes: first,
Two, third, the 4th resonator, the first end of the first resonator and the first end of third resonator are all connected to first node, the
The first end of two resonators and the first end of the 4th resonator are all connected to second node, the second end of the first resonator and the 4th
The second end of resonator is all connected to third node, and the second end of the second resonator and the second end of third resonator are all connected to
Fourth node.
4. radio-frequency filter according to claim 3, which is characterized in that first, second, third, fourth resonator
It is acoustic resonator.
5. radio-frequency filter according to claim 4, which is characterized in that the acoustic resonator is film bulk acoustic resonator
Device, solid-state assembly bulk acoustic wave resonator or SAW resonator.
6. radio-frequency filter according to claim 1, which is characterized in that wherein, the first node and second section
Point is respectively connected to the first port I/O of the radio-frequency filter, and the third node and the fourth node are respectively connected to
2nd port I/O of the radio-frequency filter.
7. radio-frequency filter according to claim 1, which is characterized in that the passband relative bandwidth of the radio-frequency filter exists
Between 10% to 20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810144420.5A CN110165343A (en) | 2018-02-12 | 2018-02-12 | A kind of radio-frequency filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810144420.5A CN110165343A (en) | 2018-02-12 | 2018-02-12 | A kind of radio-frequency filter |
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| Publication Number | Publication Date |
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| CN110165343A true CN110165343A (en) | 2019-08-23 |
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| CN201810144420.5A Pending CN110165343A (en) | 2018-02-12 | 2018-02-12 | A kind of radio-frequency filter |
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|---|---|---|---|---|
| CN1409487A (en) * | 2001-09-26 | 2003-04-09 | 诺基亚有限公司 | Double-path bandpass filter system using acoustic resonator in lattice topology structure |
| WO2004066495A1 (en) * | 2003-01-20 | 2004-08-05 | Koninklijke Philips Electronics N.V. | Circuit arrangement providing impedance transformation |
| WO2004066494A1 (en) * | 2003-01-20 | 2004-08-05 | Koninklijke Philips Electronics N.V. | Resonator filter structure with improved balance |
| CN1630980A (en) * | 2002-02-12 | 2005-06-22 | 北电网络有限公司 | Band reject filters |
| CN1653688A (en) * | 2002-05-20 | 2005-08-10 | 皇家飞利浦电子股份有限公司 | Filter structure |
| CN1739237A (en) * | 2003-01-20 | 2006-02-22 | 皇家飞利浦电子股份有限公司 | Resonator filter structure having equal resonance frequencies |
| US20060145786A1 (en) * | 2004-12-30 | 2006-07-06 | Delta Electronics, Inc. | Filter assembly |
| US7880566B2 (en) * | 2006-11-22 | 2011-02-01 | Taiyo Yuden Co., Ltd. | Balanced lattice filter device |
| CN102006029A (en) * | 2010-12-01 | 2011-04-06 | 浙江大学 | Thin film bulk acoustic resonator (FBAR) filter and components thereof |
| CN205921566U (en) * | 2016-07-26 | 2017-02-01 | 中国工程物理研究院电子工程研究所 | Wide BAW ladder -type filter of passband exhibition |
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2018
- 2018-02-12 CN CN201810144420.5A patent/CN110165343A/en active Pending
Patent Citations (10)
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|---|---|---|---|---|
| CN1409487A (en) * | 2001-09-26 | 2003-04-09 | 诺基亚有限公司 | Double-path bandpass filter system using acoustic resonator in lattice topology structure |
| CN1630980A (en) * | 2002-02-12 | 2005-06-22 | 北电网络有限公司 | Band reject filters |
| CN1653688A (en) * | 2002-05-20 | 2005-08-10 | 皇家飞利浦电子股份有限公司 | Filter structure |
| WO2004066495A1 (en) * | 2003-01-20 | 2004-08-05 | Koninklijke Philips Electronics N.V. | Circuit arrangement providing impedance transformation |
| WO2004066494A1 (en) * | 2003-01-20 | 2004-08-05 | Koninklijke Philips Electronics N.V. | Resonator filter structure with improved balance |
| CN1739237A (en) * | 2003-01-20 | 2006-02-22 | 皇家飞利浦电子股份有限公司 | Resonator filter structure having equal resonance frequencies |
| US20060145786A1 (en) * | 2004-12-30 | 2006-07-06 | Delta Electronics, Inc. | Filter assembly |
| US7880566B2 (en) * | 2006-11-22 | 2011-02-01 | Taiyo Yuden Co., Ltd. | Balanced lattice filter device |
| CN102006029A (en) * | 2010-12-01 | 2011-04-06 | 浙江大学 | Thin film bulk acoustic resonator (FBAR) filter and components thereof |
| CN205921566U (en) * | 2016-07-26 | 2017-02-01 | 中国工程物理研究院电子工程研究所 | Wide BAW ladder -type filter of passband exhibition |
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| QINGRUI YANG等: "A Wide band Bulk Acoustic Wave Filter with Modified Lattice Configuration", 《2015 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM》 * |
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| CB02 | Change of applicant information |
Address after: No. 27 Xinye Fifth Street, Tianjin Binhai New Area Economic and Technological Development Zone, 300462 Applicant after: ROFS MICROSYSTEM(TIANJIN) Co.,Ltd. Address before: No. 27 Xinye Fifth Street, Tianjin Binhai New Area Economic and Technological Development Zone, 300462 Applicant before: ROFS (TIANJIN) MICROSYSTEM Co.,Ltd. |
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Application publication date: 20190823 |
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