CN110071702B - Band-pass filter and duplexer - Google Patents
Band-pass filter and duplexer Download PDFInfo
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- CN110071702B CN110071702B CN201910123846.7A CN201910123846A CN110071702B CN 110071702 B CN110071702 B CN 110071702B CN 201910123846 A CN201910123846 A CN 201910123846A CN 110071702 B CN110071702 B CN 110071702B
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- 238000004891 communication Methods 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
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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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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezo-electric or electrostrictive material
- H03H9/547—Notch filters, e.g. notch BAW or thin film resonator filters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The present invention provides a band pass filter and a duplexer, wherein the band pass filter is arranged between an input terminal and an output terminal, and comprises the following components: the resonator comprises two groups of parallel resonators and a series resonator connected between the two groups of parallel resonators, wherein at least one group of resonators in the parallel resonators and the series resonators is formed by connecting a lamb wave resonator and an inductor, and the other two groups of resonators are formed by connecting one of a film bulk acoustic resonator or a capacitor and the inductor; the capacitor at the specific position of the band-pass filter is replaced by the LWR, on one hand, the LWR can effectively improve the roll-off by arranging the frequency at two sides of the passband of the filter, on the other hand, the LWR can adjust the frequency through the physical thickness of each layer of the device and the distance of surface patterns, the frequency adjusting range is wider, and the LWR can ensure that the roll-off at two sides can be improved by using the same die under the condition that the frequency of the ultra-wideband filter with high bandwidth, particularly the ultra-wideband filter consisting of the LC filter, is wider.
Description
Technical Field
The invention relates to the field of semiconductors and micro electro mechanical systems, in particular to a band-pass filter and a duplexer.
Background
With the rapid development of wireless communication systems, the performance requirements of the radio frequency front end are becoming more and more stringent. And the development of wireless communication systems towards multiple functions, multiple frequency bands, and multiple protocols, which presents higher challenges for the rf front-end in wireless communication devices. As a very important module in the rf front-end, the performance of the filter plays a decisive role in the rf front-end performance. There is therefore a very urgent need for continued improvements in filter performance.
Prior art LC band pass filters typically include an LC series resonant network in a series path and two parallel resonant networks in a parallel path. Wherein, the series resonance network can be replaced by a parallel resonance network or even a single L or C, and the parallel resonance network can be replaced by a series resonance network or a single L or C. The existing LC band pass filter can replace the capacitor therein with the FBAR to improve the roll-off, but the frequency adjusting range of the FBAR is relatively small, and the wide frequency interval cannot be realized on the same die for the broadband filter, so two dice are needed, one is set at about 3.3GHz, and the other is set at 3.9GHz. This has the technical problem of high cost and difficulty in implementation.
Therefore, how to improve the roll-off of the bandpass filter and the duplexer and increase the frequency adjustment range of the filter by using the LWR resonators is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
Accordingly, the present invention provides a bandpass filter and a duplexer, which improve the roll-off of the bandpass filter and the duplexer and increase the frequency adjustment range of the filter by changing the structure of the bandpass filter.
In a first aspect, there is provided a band-pass filter between an input terminal and an output terminal, comprising:
two groups of parallel resonators and a series resonator connected between the two groups of parallel resonators,
at least one group of the parallel resonators and the series resonators is formed by connecting lamb wave resonators and inductors, and the other two groups of resonators are formed by connecting Film Bulk Acoustic Resonators (FBAR) or capacitors and inductors.
Preferably, the at least one group of parallel resonators is formed by connecting an inductor and a lamb wave resonator in parallel.
Preferably, the two groups of parallel resonators are formed by connecting an inductor and a lamb wave resonator in parallel, and the inductor and the lamb wave resonator in the parallel resonators are both connected with a grounding end.
More preferably, the two groups of parallel resonators are formed by connecting an inductor and a lamb wave resonator in parallel, and the series resonator is formed by connecting an inductor and a capacitor in series.
More preferably, the two groups of parallel resonators are formed by connecting an inductor and a lamb wave resonator in parallel, and the series resonator is formed by connecting an inductor and a lamb wave resonator in series.
Preferably, one of the two groups of parallel resonators is formed by connecting an inductor and a lamb wave resonator in parallel, the other group is formed by connecting an inductor and a capacitor in parallel, and the inductor and the lamb wave resonator in the parallel resonators are both connected with a grounding end.
More preferably, one of the two sets of parallel resonators is formed by connecting an inductor and a lamb wave resonator in parallel, and the other set is formed by connecting an inductor and a capacitor in parallel, and the series resonator is formed by connecting an inductor and a capacitor in series.
More preferably, one of the two sets of parallel resonators is formed by connecting an inductor and a lamb wave resonator in parallel, and the other set is formed by connecting an inductor and a capacitor in parallel, and the series resonator is formed by connecting an inductor and a lamb wave resonator in series.
Preferably, the series resonator is formed by connecting an inductor and a lamb wave resonator in series, the two groups of parallel resonators are formed by connecting an inductor and a capacitor in parallel, and the inductor and the capacitor in the parallel resonators are connected with a grounding end.
In a second aspect, a duplexer is provided, including:
a transmission filter connected between a transmission terminal and an antenna terminal and including a series resonator and a parallel resonator connected in a ladder form; and
a reception filter connected between a reception end and the antenna end and including a series resonator and a parallel resonator connected in a ladder form,
the transmitting filter and the receiving filter are the band-pass filters.
Compared with the prior art, the invention has the beneficial effects that:
the LWR lamb wave resonator is introduced into the design of the band-pass filter and the duplexer, the capacitor at a specific position of the band-pass filter is replaced by the LWR, on one hand, the LWR can effectively improve the roll-off by arranging the frequency at two sides of the passband of the filter, on the other hand, the LWR can adjust the frequency through the physical thickness of each layer of the device and the space of a surface pattern, the frequency adjusting range is wider, for the ultra-wideband filter with high bandwidth, particularly the LC filter, the roll-off improvement at two sides can be realized under the condition that the frequency is realized to be wider, and compared with the prior method that the high roll-off is realized through other type acoustic wave resonators such as FBAR, the LWR lamb wave resonator has obvious advantages in the aspects of improving the roll-off and increasing the frequency adjusting range of the filter because the frequency range is wider and the same die is difficult to realize.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
fig. 1 is a circuit configuration diagram of a prior art band pass filter.
Figure 2 is a simulation plot of a prior art bandpass filter.
Fig. 3 is a circuit configuration diagram of a band pass filter according to a first embodiment of the present application.
Fig. 4 is a simulation curve of the band pass filter of the first embodiment of the present application.
Fig. 5 is a circuit configuration diagram of a bandpass filter according to a second embodiment of the present application.
Fig. 6 is a circuit configuration diagram of a bandpass filter according to a third embodiment of the present application.
Fig. 7 is a circuit configuration diagram of a bandpass filter according to a fourth embodiment of the present application.
Fig. 8 is a circuit configuration diagram of a bandpass filter according to a fifth embodiment of the present application.
Fig. 9 is a circuit configuration diagram of a bandpass filter according to a sixth embodiment of the present application.
Fig. 10 is a circuit configuration diagram of a band pass filter according to a seventh embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the conventional bandpass filter includes an LC parallel resonator 10 in which an inductor L1 and a capacitor C1 are connected in parallel and an LC parallel resonator 20 in which an inductor L2 and a capacitor C2 are connected in parallel between an input terminal P1 and an output terminal P2, and an LC series resonator 30 in which an inductor L3 and a capacitor C3 are connected in series is connected between the LC parallel resonator 10 and the LC parallel resonator 20.
Fig. 2 shows a simulation result of a conventional band pass filter. As can be seen from fig. 2, the LC band pass filter in the prior art has a narrow frequency adjustment range, and cannot achieve two frequency points to improve roll-off in the same chip in a wide frequency band range of 3.2GHz and 3.9GHz.
Example 1
Fig. 3 shows a circuit configuration diagram of a bandpass filter according to a first embodiment of the present application. As shown in fig. 3, a band pass filter, between an input terminal P1 and an output terminal P2, includes:
a parallel resonator 10 formed by connecting an inductor L1 and a lamb wave resonator LWR1 in parallel, a parallel resonator 20 formed by connecting an inductor L2 and a lamb wave resonator LWR2 in parallel, an LC series resonator 30 formed by connecting an inductor L3 and a capacitor C3 in series between the parallel resonator 10 and the parallel resonator 20,
the inductor L1, the inductor L2, the lamb wave resonator LWR1, and the lamb wave resonator LWR2 are all connected to a ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2.
Fig. 4 shows simulation results of a conventional band pass filter. As can be seen from fig. 4, the bandpass filter of embodiment 1 of the present invention has significantly improved roll-off in the vicinity of 3.32GHz and 3.86GHz, and can achieve double-sided roll-off improvement on the same chip in a wide frequency band range of 3.2GHz and 3.9GHz.
Example 2
Fig. 5 shows a circuit configuration diagram of a band pass filter according to a second embodiment of the present application. As shown in fig. 5, a band pass filter, between an input terminal P1 and an output terminal P2, includes:
a parallel resonator 10 formed by connecting an inductor L1 and a lamb wave resonator LWR1 in parallel, a parallel resonator 20 formed by connecting an inductor L2 and a lamb wave resonator LWR2 in parallel, a series resonator 30 formed by connecting an inductor L3 and a lamb wave resonator LWR3 in series between the parallel resonator 10 and the parallel resonator 20,
the inductor L1, the inductor L2, the lamb wave resonator LWR1, and the lamb wave resonator LWR2 are all connected to a ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2.
Example 3
Fig. 6 shows a circuit configuration diagram of a bandpass filter of a third embodiment of the present application. As shown in fig. 6, a band pass filter, between an input terminal P1 and an output terminal P2, includes:
a parallel resonator 10 formed by connecting an inductor L1 and a lamb wave resonator LWR1 in parallel, a parallel resonator 20 formed by connecting an inductor L2 and a capacitor C2 in parallel, an LC series resonator 30 formed by connecting an inductor L3 and a capacitor C3 in series between the parallel resonator 10 and the parallel resonator 20,
the inductor L1, the inductor L2, the lamb wave resonator LWR1, and the capacitor C1 are all connected to a ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2.
Example 4
Fig. 7 shows a circuit configuration diagram of a bandpass filter of a fourth embodiment of the present application. As shown in fig. 7, a band pass filter, between an input terminal P1 and an output terminal P2, includes:
a parallel resonator 10 formed by connecting an inductor L1 and a capacitor C1 in parallel, a parallel resonator 20 formed by connecting an inductor L2 and a lamb wave resonator LWR2 in parallel, a series resonator 30 formed by connecting an inductor L3 and a capacitor C3 in series between the parallel resonator 10 and the parallel resonator 20,
the inductor L1, the inductor L2, the capacitor C1, and the lamb wave resonator LWR2 are all connected to a ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2.
Example 5
Fig. 8 shows a circuit configuration diagram of a bandpass filter of a fifth embodiment of the present application. As shown in fig. 8, a band pass filter, between an input terminal P1 and an output terminal P2, includes:
a parallel resonator 10 formed by connecting an inductor L1 and a lamb wave resonator LWR1 in parallel, a parallel resonator 20 formed by connecting an inductor L2 and a capacitor C2 in parallel, a series resonator 30 formed by connecting an inductor L3 and a lamb wave resonator LWR3 in series between the parallel resonator 10 and the parallel resonator 20,
the inductor L1, the inductor L2, the lamb wave resonator LWR1, and the capacitor C2 are all connected to a ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2.
Example 6
Fig. 9 shows a circuit configuration diagram of a bandpass filter of a sixth embodiment of the present application. As shown in fig. 9, a band pass filter, between an input terminal P1 and an output terminal P2, includes:
a parallel resonator 10 formed by connecting an inductor L1 and a capacitor C1 in parallel, a parallel resonator 20 formed by connecting an inductor L2 and a lamb wave resonator LWR2 in parallel, a series resonator 30 formed by connecting an inductor L3 and a lamb wave resonator LWR3 in series between the parallel resonator 10 and the parallel resonator 20,
the inductor L1, the inductor L2, the capacitor C1, and the lamb wave resonator LWR2 are all connected to a ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2.
Example 7
Fig. 10 shows a circuit configuration diagram of a band pass filter of a seventh embodiment of the present application. As shown in fig. 10, a band pass filter, which is between an input terminal P1 and an output terminal P2, includes:
a parallel resonator 10 formed by connecting an inductor L1 and a capacitor C1 in parallel, a parallel resonator 20 formed by connecting an inductor L2 and a capacitor C2 in parallel, a series resonator 30 formed by connecting an inductor L3 and a lamb wave resonator LWR3 in series between the parallel resonator 10 and the parallel resonator 20,
the inductor L1, the inductor L2, the capacitor C1, and the capacitor C2 are all connected to a ground terminal, the parallel resonator 10 is connected to the input terminal P1, and the parallel resonator 20 is connected to the output terminal P2.
It should be noted that the capacitor in the above embodiments may be replaced with a Film Bulk Acoustic Resonator (FBAR) in whole or in part.
In the several embodiments provided in the present application, it should be understood that the disclosed system and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
Although the present invention has been described in detail in connection with the preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A band pass filter between an input terminal and an output terminal, comprising:
two groups of parallel resonators and a series resonator connected between the two groups of parallel resonators,
at least one group of the parallel resonators and the series resonators is formed by connecting lamb wave resonators and inductors, and the other two groups of resonators are formed by connecting one of film bulk acoustic resonators or capacitors and inductors.
2. The bandpass filter according to claim 1, wherein the at least one set of parallel resonators is formed by connecting an inductor in parallel with a lamb wave resonator.
3. The bandpass filter according to claim 2, wherein each of the two sets of parallel resonators is formed by connecting an inductor and a lamb wave resonator in parallel, and the inductor and the lamb wave resonator in the parallel resonators are connected to a ground terminal.
4. The bandpass filter according to claim 3, wherein the two groups of parallel resonators are each formed by connecting an inductor in parallel with a lamb wave resonator, and the series resonators are formed by connecting an inductor in series with a capacitor.
5. The bandpass filter according to claim 3, wherein the two sets of parallel resonators are each formed by connecting an inductor in parallel with a lamb wave resonator, and the series resonators are formed by connecting an inductor in series with a lamb wave resonator.
6. The bandpass filter according to claim 2, wherein the two parallel resonators are formed by connecting an inductor and a lamb wave resonator in parallel, and one is formed by connecting an inductor and a capacitor in parallel, and the inductor and the lamb wave resonator in the parallel resonators are connected to a ground terminal.
7. The bandpass filter according to claim 6, wherein the two sets of parallel resonators are formed by connecting an inductor in parallel with a lamb wave resonator, one set is formed by connecting an inductor in parallel with a capacitor, and the series resonator is formed by connecting an inductor in series with a capacitor.
8. The bandpass filter according to claim 6, wherein the two sets of parallel resonators are formed by connecting an inductor in parallel with a lamb wave resonator, one set is formed by connecting an inductor in parallel with a capacitor, and the series resonator is formed by connecting an inductor in series with a lamb wave resonator.
9. The bandpass filter according to claim 2, wherein the series resonators are formed by connecting an inductor and a lamb wave resonator in series, the two parallel resonators are formed by connecting an inductor and a capacitor in parallel, and the inductor and the capacitor in the parallel resonators are connected to a ground terminal.
10. A duplexer, characterized by comprising:
a transmission filter connected between a transmission terminal and an antenna terminal and including a series resonator and a parallel resonator connected in a ladder form; and
a reception filter connected between a reception end and the antenna end and including a series resonator and a parallel resonator connected in a ladder form,
wherein, the transmitting filter and the receiving filter are the band-pass filter of any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910123846.7A CN110071702B (en) | 2019-02-19 | 2019-02-19 | Band-pass filter and duplexer |
| PCT/CN2020/074878 WO2020168958A1 (en) | 2019-02-19 | 2020-02-12 | Band-pass filter, and duplexer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910123846.7A CN110071702B (en) | 2019-02-19 | 2019-02-19 | Band-pass filter and duplexer |
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| CN110071702A CN110071702A (en) | 2019-07-30 |
| CN110071702B true CN110071702B (en) | 2023-04-07 |
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| CN110071702B (en) * | 2019-02-19 | 2023-04-07 | 天津大学 | Band-pass filter and duplexer |
| CN110661508A (en) * | 2019-09-17 | 2020-01-07 | 天津大学 | Duplexer, multiplexer, high-frequency front-end circuit and communication device |
| CN111130499B (en) * | 2020-01-06 | 2023-05-02 | 中国电子科技集团公司第十三研究所 | Broadband film cavity acoustic resonant filter |
| CN111371407B (en) * | 2020-03-18 | 2021-02-26 | 诺思(天津)微系统有限责任公司 | Method for adjusting resonance frequency, filter, multiplexer and communication equipment |
| CN111969978B (en) * | 2020-08-31 | 2022-03-15 | 诺思(天津)微系统有限责任公司 | Filter design method, filter, multiplexer and communication equipment |
| CN116527009B (en) * | 2023-06-20 | 2023-12-05 | 华南理工大学 | Filter with electrical device and acoustic device mixed and radio frequency front end |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1870426A (en) * | 2005-05-25 | 2006-11-29 | 富士通媒体部品株式会社 | Acoustic wave filter and acoustic wave duplexer |
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| FR2922696B1 (en) * | 2007-10-22 | 2010-03-12 | St Microelectronics Sa | WAVE RESONATOR OF LAMB |
| JP2010220163A (en) * | 2009-03-19 | 2010-09-30 | Seiko Epson Corp | Lamb-wave resonator and oscillator |
| JP2012253497A (en) * | 2011-06-01 | 2012-12-20 | Taiyo Yuden Co Ltd | Electronic circuit and electronic module |
| WO2013118237A1 (en) * | 2012-02-06 | 2013-08-15 | 太陽誘電株式会社 | Filter circuit and module |
| JP2013223025A (en) * | 2012-04-13 | 2013-10-28 | Taiyo Yuden Co Ltd | Filter device, method of manufacturing filter device, and duplexer |
| JP5896039B2 (en) * | 2012-10-24 | 2016-03-30 | 株式会社村田製作所 | Filter device |
| WO2014075183A1 (en) * | 2012-11-13 | 2014-05-22 | Talebinejad Mehran | Circuit and method for use in transcranial magnetic stimulation |
| JP5818033B2 (en) * | 2013-07-23 | 2015-11-18 | Tdk株式会社 | Diplexer |
| JP6337867B2 (en) * | 2015-10-26 | 2018-06-06 | 株式会社村田製作所 | Band pass filter and duplexer |
| JP6590760B2 (en) * | 2016-06-10 | 2019-10-16 | 太陽誘電株式会社 | Elastic wave device |
| CN110679033A (en) * | 2017-05-11 | 2020-01-10 | 伊根图有限公司 | Compact band-pass filter |
| CN110071702B (en) * | 2019-02-19 | 2023-04-07 | 天津大学 | Band-pass filter and duplexer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1870426A (en) * | 2005-05-25 | 2006-11-29 | 富士通媒体部品株式会社 | Acoustic wave filter and acoustic wave duplexer |
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| CN110071702A (en) | 2019-07-30 |
| WO2020168958A1 (en) | 2020-08-27 |
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