CN116192081A - Filter, terminal and base station - Google Patents
Filter, terminal and base station Download PDFInfo
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- CN116192081A CN116192081A CN202211663162.4A CN202211663162A CN116192081A CN 116192081 A CN116192081 A CN 116192081A CN 202211663162 A CN202211663162 A CN 202211663162A CN 116192081 A CN116192081 A CN 116192081A
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Abstract
The embodiment of the invention provides a filter, a terminal and a base station, wherein the filter comprises: at least one series-stage resonant cell; at least one parallel stage resonant cell; the at least one series-stage resonance unit is a roll-off adjusting resonance unit, the roll-off adjusting resonance unit comprises a first roll-off adjusting resonator and a second roll-off adjusting resonator which are connected in parallel, the difference between parallel resonance frequencies and/or the difference between series resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator is greater than or equal to the passband bandwidth of the filter, the parallel resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator are located between the passband and the stopband of the filter, and the roll-off performance of the filter is improved.
Description
Technical Field
The embodiment of the invention relates to the field of filter manufacturing, in particular to a filter, a terminal and a base station.
Background
A filter is a device that realizes transmission characteristics of a passband and an out-of-band by forming a certain frequency difference between series-parallel resonators. The filter is used for passing a frequency range which is a pass band, and an out-of-band frequency range which is outside the pass band is a stop band.
The process of rapidly reducing the amplitude of the pass band from the amplitude of the pass band to the amplitude of the stop band between the pass band and the stop band of the filter is called roll-off. It can be appreciated that the steeper the drop trend, the better the filter performance of the filter.
The roll-off performance of the existing filter is not high.
Disclosure of Invention
In view of the above, the embodiments of the present invention provide a filter, a terminal and a base station to optimize the roll-off performance of the filter.
In order to solve the above problems, the embodiment of the present invention provides the following technical solutions:
in a first aspect, an embodiment of the present invention provides a filter, including:
acquiring quality factors corresponding to the parallel resonance frequency and the series resonance frequency of the resonator under different structural parameters;
at least one series-stage resonant cell;
at least one parallel stage resonant cell;
the at least one serial-stage resonance unit is a roll-off adjusting resonance unit, the roll-off adjusting resonance unit comprises a first roll-off adjusting resonator and a second roll-off adjusting resonator which are connected in parallel, the difference between parallel resonance frequencies and/or the difference between serial resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator is greater than or equal to the passband bandwidth of the filter, and the parallel resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator are between the passband and the stopband of the filter.
In a second aspect, an embodiment of the present invention provides a terminal, where the terminal includes a filter according to the embodiment of the present invention.
In a third aspect, an embodiment of the present invention provides a base station, where the base station includes a filter according to the embodiment of the present invention.
The embodiment of the invention provides a filter, a terminal and a base station, wherein the filter comprises: at least one series-stage resonant cell; at least one parallel stage resonant cell; the at least one serial-stage resonance unit is a roll-off adjusting resonance unit, the roll-off adjusting resonance unit comprises a first roll-off adjusting resonator and a second roll-off adjusting resonator which are connected in parallel, the difference between parallel resonance frequencies and/or the difference between serial resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator is greater than or equal to the passband bandwidth of the filter, and the parallel resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator are between the passband and the stopband of the filter.
In the filter provided by the embodiment of the invention, one roll-off adjusting resonant unit is arranged in the resonant units of the serial stages, the roll-off adjusting resonant unit utilizes the difference between parallel resonant frequencies and/or the difference between the serial resonant frequencies to be larger than or equal to the passband bandwidth of the filter, and the parallel resonant frequencies are in parallel connection with the first roll-off adjusting resonator and the second roll-off adjusting resonator between the passband and the stopband of the filter, so that a steep roll-off trend is formed between the passband and the stopband, and the roll-off performance of the filter is optimized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is an alternative circuit diagram of a filter of an embodiment of the present invention;
FIG. 2 is another alternative circuit diagram of a filter of an embodiment of the present invention;
fig. 3 is an alternative circuit diagram of a roll off adjustment resonance unit of an embodiment of the present invention;
fig. 4 is a schematic diagram of an impedance curve of a roll-off adjustment resonance unit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a transmission curve of a roll-off adjustment resonance unit according to an embodiment of the present invention;
fig. 6 is another alternative circuit diagram of a roll-off adjustment resonance unit provided by an embodiment of the present invention;
FIG. 7 is an alternative circuit diagram of a parallel stage resonant cell provided by an embodiment of the present invention;
FIG. 8 is another alternative circuit diagram of a parallel stage resonant cell provided by an embodiment of the present invention;
FIG. 9 is an alternative circuit diagram of a series-stage resonant cell provided by an embodiment of the present invention;
FIG. 10 is another alternative circuit diagram of a series-stage resonant cell provided by an embodiment of the present invention;
FIG. 11 is an alternative block diagram of a base resonator provided by an embodiment of the present invention;
FIG. 12 is a diagram of an alternative circuit example of a filter provided by an embodiment of the present invention;
FIG. 13 is a diagram of an alternative circuit example of another filter provided by an embodiment of the present invention;
FIG. 14 is a diagram of an alternative circuit example of yet another filter provided by an embodiment of the present invention;
fig. 15 is a diagram showing an alternative circuit example of a further filter according to the embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As described in the background art, the roll-off performance of the existing filter is not high.
In view of this, an embodiment of the present invention provides a filter, a terminal, and a base station, where the filter includes: at least one series-stage resonant cell; at least one parallel stage resonant cell; the at least one serial-stage resonance unit is a roll-off adjusting resonance unit, the roll-off adjusting resonance unit comprises a first roll-off adjusting resonator and a second roll-off adjusting resonator which are connected in parallel, the difference between parallel resonance frequencies and/or the difference between serial resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator is greater than or equal to the passband bandwidth of the filter, and the parallel resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator are between the passband and the stopband of the filter.
In the filter provided by the embodiment of the invention, one roll-off adjusting resonant unit is arranged in the resonant units of the series stages, the roll-off adjusting resonant unit utilizes the difference between parallel resonant frequencies and/or the difference between the series resonant frequencies to be larger than or equal to the passband bandwidth of the filter, and the parallel resonant frequencies are in parallel connection with the first roll-off adjusting resonator and the second roll-off adjusting resonator between the passband and the stopband of the filter, so that a steep roll-off trend is formed between the passband and the stopband, and the roll-off performance of the filter is optimized.
Fig. 1 illustrates an alternative circuit diagram of a filter in accordance with an embodiment of the present invention. As shown in fig. 1, the filter includes:
at least one series-stage resonant cell; at least one parallel stage resonant cell;
the at least one serial-stage resonance unit is a roll-off adjusting resonance unit, the roll-off adjusting resonance unit comprises a first roll-off adjusting resonator and a second roll-off adjusting resonator which are connected in parallel, the difference between parallel resonance frequencies and/or the difference between serial resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator is greater than or equal to the passband bandwidth of the filter, and the parallel resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator are between the passband and the stopband of the filter.
The series-stage resonance unit can be understood as a resonance unit connected in series on the input-to-output path of the filter; the parallel stage resonant unit may be understood as a resonant unit having one end electrically connected to the input-to-output path of the filter and one end grounded. Wherein the resonance unit may include a plurality of resonators connected in series or in parallel. The number of stages of the resonant units may be sequentially defined on the input-to-output path of the filter, for example, the resonant unit closest to the input end of the filter may be the first stage, and further the second stage, the third stage, etc. may be sequentially defined according to the connection relationship between the resonant units on the input-to-output path. Wherein the number of stages of the resonant cells may be determined based on the types of the series-stage resonant cells and the parallel-stage resonant cells, respectively. For example, the series-stage resonant unit closest to the input end of the filter may be a first-stage series-stage resonant unit, and further, according to the connection relationship between the series-stage resonant units in the input-to-output path, the second-stage series-stage resonant unit, the third-stage series-stage resonant unit, and so on are sequentially defined, and similarly, the parallel-stage resonant unit may also sequentially define a corresponding stage number according to the connection relationship between the parallel-stage resonant units in the input-to-output path.
Referring to an alternative circuit diagram of the filter shown IN fig. 1, an input terminal is denoted as IN, and an output terminal is denoted as OUT, wherein a plurality of series-stage resonant units Se1, se2, and Se3 are included on an input path, wherein based on a connection relationship of the series-stage resonant units Se1, se2, and Se3 on an input-to-output path, it can be seen that the series-stage resonant unit Se1 is a first-stage series-stage resonant unit, the series-stage resonant unit Se2 is a second-stage series-stage resonant unit, and the series-stage resonant unit Se3 is a third-stage series-stage resonant unit.
Correspondingly, on the input path, the input device comprises a plurality of parallel stage resonant units Sh1, sh2 and Sh3, wherein based on the connection relation of the parallel stage resonant units Sh1, sh2 and Sh3 on the input-output path, it can be seen that the parallel stage resonant unit Sh1 is a first-stage parallel stage resonant unit, the parallel stage resonant unit Sh2 is a second-stage parallel stage resonant unit, and the parallel stage resonant unit Sh3 is a third-stage parallel stage resonant unit.
In an alternative example of the present invention, to reduce the insertion loss of the filter, the parallel resonant units may be further connected in series with an inductor, and as shown in fig. 1, inductors G1, G2 and G3 are connected in series between the parallel resonant units Sh1, sh2 and Sh3 and the ground, respectively. In other optional examples, a series inductor may be further combined between the parallel resonant units and the ground, for example, referring to another optional circuit diagram of the filter in the embodiment of the present invention shown in fig. 2, a series inductor G4 is commonly connected between the parallel resonant units Sh1 and Sh2 and the ground, and a series inductor G5 is separately connected between the Sh3 and the ground.
In the embodiment of the present invention, at least one serial-stage resonant unit is set as a roll-off tuning resonant unit, referring to an optional circuit diagram of the roll-off tuning resonant unit in the embodiment of the present invention shown in fig. 3, the roll-off tuning resonant unit includes a first roll-off tuning resonator P11 and a second roll-off tuning resonator P12 connected in parallel, a difference between parallel resonant frequencies and/or a difference between serial resonant frequencies of the first roll-off tuning resonator and the second roll-off tuning resonator is greater than or equal to a passband bandwidth of the filter, and a parallel resonant frequency of the first roll-off tuning resonator and the second roll-off tuning resonator is between a passband and a stopband of the filter.
In the embodiment of the invention, the resonance unit may include a basic resonator and a roll-off adjusting resonator, wherein the basic resonator may be understood as a resonator adapting to the passband and stopband characteristics of the filter, so as to enable the filter to embody a corresponding filtering function, and the roll-off adjusting resonator may be understood as a resonator for adjusting the roll-off performance of the filter. Specifically, the first roll-off adjusting resonator and the second roll-off adjusting resonator are 2 roll-off adjusting resonators for adjusting the roll-off performance of the filter, and the roll-off performance can be adjusted on the premise of meeting the performance requirements of frequency matching and echo by the fact that the difference between the parallel resonant frequencies and/or the difference between the series resonant frequencies is greater than or equal to the passband bandwidth of the filter and the parallel resonant frequencies of the two are between the passband and the stopband of the filter.
Taking the roll-off adjusting resonance unit shown in fig. 3 as an example, the Impedance curve of the roll-off adjusting resonance unit may refer to the Impedance curve schematic shown in fig. 4, wherein the abscissa is the frequency freq, the ordinate is the Impedance im according to the Impedance curve shown in the figure, and compared with the Impedance curves of the parallel resonance unit and the series resonance unit shown in the figure, it can be seen that, since the difference between the parallel resonance frequencies and/or the difference between the series resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator in the roll-off adjusting resonance unit is greater than or equal to the passband bandwidth of the filter, and the parallel resonance frequency is between the passband and the stop band of the filter, the Impedance of the 2 roll-off adjusting resonators at the corresponding parallel resonance frequency has two peaks P1 and P2 between the passband BP and the stop band BR of the filter, respectively, and the ordinate is the sharp roll-off peak Q1 and Q2 are generated at the frequency position, so that the transmission peak Q1 and Q2 are the steep roll-off characteristics of the filter are optimized.
It can be understood that, in the filter, the larger the bandwidth is, the worse the corresponding roll-off performance is, and the roll-off performance of the filter can be improved based on the roll-off adjusting resonance unit in the embodiment of the invention, so that the filter in the embodiment of the invention can still maintain better roll-off performance even if the filter is set to be larger in bandwidth, and further, the insertion loss of the filter can be improved under the condition that the filter meets certain inhibition.
In a preferred example, in the roll-off adjusting resonance unit, a difference between parallel resonance frequencies and/or a difference between series resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator may be greater than or equal to 1.1 times a passband bandwidth of the filter, thereby ensuring improved suppression and roll-off on both sides of a filter passband.
In the roll off adjusting resonant unit, the upper electrode of the resonator and the lower electrode of the resonator may be sequentially connected in a mixed manner, or the upper electrode of the resonator and the lower electrode of the resonator may be respectively electrically connected.
Specifically, in an alternative example, referring to fig. 3, in the roll-off adjusting resonance unit, electrodes of a roll-off adjusting resonator are mixed, that is, an upper electrode of a first roll-off adjusting resonator P11 and a lower electrode of a second roll-off adjusting resonator P12 are electrically connected to one end of the roll-off adjusting resonance unit, and a lower electrode of the first roll-off adjusting resonator P11 and an upper electrode of the second roll-off adjusting resonator P12 are electrically connected to the other end of the roll-off adjusting resonance unit.
In another alternative example, referring to another alternative circuit diagram of the roll-off adjusting resonance unit of the embodiment of the present invention shown in fig. 6, in the roll-off adjusting resonance unit, electrodes of the roll-off adjusting resonators are electrically connected in sequence, that is, upper electrodes of the first roll-off adjusting resonator P11 and the second roll-off adjusting resonator P12 are electrically connected to one end of the roll-off adjusting resonance unit, and lower electrodes of the first roll-off adjusting resonator and the second roll-off adjusting resonator are electrically connected to the other end of the roll-off adjusting resonance unit.
It is understood that the roll-off adjusting resonance unit may utilize a difference between parallel resonance frequencies and/or a difference between series resonance frequencies to be greater than or equal to a passband bandwidth of the filter, and the parallel resonance frequency is between a first roll-off adjusting resonator and a second roll-off adjusting resonator connected in parallel between the passband and the stopband of the filter, so as to form a steep roll-off trend between the passband and the stopband, thereby optimizing roll-off performance of the filter.
In order to ensure the power and nonlinear characteristics of the filter, the parallel-stage resonant unit of the filter may include a plurality of parallel resonators, and the plurality of parallel resonators may also include a plurality of roll-off adjustment resonators.
Referring to an alternative circuit diagram of a parallel stage resonant unit of the filter shown in fig. 7, at least one parallel stage resonant unit includes a plurality of parallel basic resonators (2 are shown as examples in the figure, sh11 and Sh12, respectively), and electrodes of the parallel basic resonators are electrically connected in sequence, that is, upper electrodes of at least 2 basic resonators are electrically connected to one end of the parallel stage resonant unit, and lower electrodes of at least 2 basic resonators are electrically connected to the other end of the parallel stage resonant unit.
In other examples, referring to another alternative structure of the parallel stage resonant unit shown in fig. 8, at least one of the parallel stage resonant units of the filter includes a plurality of parallel basic resonators (Sh 11 and Sh12, respectively, are shown by way of example in 2), and electrodes of the parallel basic resonators are connected in a mixed manner, that is, an upper electrode of at least one basic resonator and a lower electrode of another basic resonator are electrically connected to one end of the parallel stage resonant unit, and a lower electrode of the at least one basic resonator and an upper electrode of the another basic resonator are electrically connected to the other end of the parallel stage resonant unit.
Wherein, in order to ensure the power and nonlinear characteristics of the filter, a plurality of basic resonators connected in series can be included in the series-stage resonant unit of the filter. Referring to an alternative circuit diagram of a series-stage resonator unit shown in fig. 9, at least one series-stage resonator unit includes a plurality of series-connected basic resonators (illustrated as 2 in the figure as Se11 and Se12, respectively) and electrodes of the series-connected basic resonators are electrically connected in sequence, that is, an upper electrode of at least one basic resonator is electrically connected with a lower electrode of another basic resonator.
In other examples, referring to another alternative circuit diagram of the series-stage resonant unit shown in fig. 10, at least one of the parallel-stage resonant units of the filter includes a plurality of series-connected basic resonators (2 are shown as examples in the figure, se11 and Se12 respectively), and electrodes of the series-connected basic resonators are connected in a mixed manner, that is, an upper electrode of at least one basic resonator is electrically connected with an upper electrode of another basic resonator.
In a specific example, the number of the series-stage resonance units is greater than or equal to 2, and the number of the parallel-stage resonance units is greater than or equal to 3; the roll off adjusting resonance unit is located at the first stage of the series-stage resonance unit.
In a preferred example, to improve rejection and harmonics at the frequency doubling, in an embodiment of the invention, the filter may also be made to have at least 1 transmission zero around 2 multiples of the center frequency of the passband of the filter. Specifically, in the embodiment of the present invention, at least 1 transmission zero exists in a preset frequency band of the filter, where the preset frequency band is [2f0-1ghz,2f0+1ghz ], and f0 is a passband center frequency of the filter.
The center frequency f0 of the passband refers to a frequency located at a center position in the passband, and the center frequency f0 may be 0.5 times of the sum of the maximum frequency f1 and the minimum frequency f2 of the passband, that is: f0 = (f1+f2)/2.
The transmission zero point means: in a certain frequency range, the insertion loss value (or the suppression value) at the center frequency of the frequency range is the lowest. On the transmission curve, the transmission zero exhibits a valley within a certain range. For example, on the transmission curve, the values of S21 at a frequency f, f+fn and f-fn are both higher than the value at f, which is the position of the transmission zero point, where fn may be a smaller value, such as 1MHz.
In particular, in the filter, a roll-off adjusting resonance unit may be provided in which a ratio of a difference between parallel resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator to a center frequency of the filter is greater than or equal to 0.02, thereby improving suppression and harmonics at a frequency doubling.
Further, in the filter, a final-stage resonance unit may be a parallel-stage resonance unit, wherein the final-stage resonance unit is a final-stage resonance unit electrically connected to an output end of the filter, so as to improve suppression and harmonics at a frequency doubling position.
The final resonant unit of the parallel stage can be equivalent to a capacitor and is sensitive to echo, so that the capacitor of the final parallel stage can be set to be smaller, namely the equivalent area is smaller, meanwhile, in order to ensure that the suppression is still near the frequency doubling, the corresponding grounding inductance can be set to be larger, in some preferred examples, the final inductance can be independently connected in series between the final resonant unit and the grounding end, and the inductance value of the final inductance is larger than that of other inductances in the filter.
In a specific example, referring to an alternative structural diagram of a base resonator shown in fig. 11, the base resonator may include: a substrate 100, a lower electrode 120 on the substrate 100, a piezoelectric layer 130 conformally covering the lower electrode 120, and an upper electrode 140 on the piezoelectric layer 130. Wherein the thickness of the piezoelectric layer of the basic resonator is between 0.4um and 0.7um, more preferably between 0.45um and 0.65 um.
In a further example, in the filter, the resonators are all Film Bulk Acoustic Resonators (FBARs), i.e., the base resonator and the roll-off tuning resonator are all film bulk acoustic resonators.
In the following, embodiments of the present invention further provide specific structural examples of the filter, which examples can be understood as preferred examples of embodiments of the present invention.
Referring to an alternative circuit example diagram of a filter shown in fig. 12, in the filter, 3 series-stage resonant cells Se101, se102, and Se103,3 parallel-stage resonant cells Sh101, sh102, and Sh103 are included, wherein an inductance G101 is commonly connected in series between a first-stage parallel resonant cell Sh101 and a second-stage parallel resonant cell Sh102 and a ground terminal, and an inductance G102 is connected in series between a third-stage parallel resonant cell Sh103 and the ground terminal;
the second-stage series-stage resonant unit Se102 is a roll-off adjustment resonant unit, in the parallel-stage resonant unit, at least electrodes of basic resonators in one-stage parallel-stage resonant unit are connected in parallel in a mixed manner, in this example, in the second-stage parallel-stage resonant unit Sh102, electrodes of the basic resonators are connected in a mixed manner, that is, an upper electrode of one basic resonator and a lower electrode of another basic resonator are electrically connected to one end of the parallel-stage resonant unit, and a lower electrode of one basic resonator and an upper electrode of the other basic resonator are electrically connected to the other end of the parallel-stage resonant unit.
Referring to an alternative circuit example diagram of another filter shown in fig. 13, unlike the previous example, in the filter, in the first-stage series-stage resonant cell Se101, the base resonators are connected in series, specifically, electrodes of the base resonators are electrically connected in sequence, that is, an upper electrode of a former base resonator is electrically connected with a lower electrode of a latter base resonator, thereby helping to shunt a power signal applied to the resonators, reduce power on a single resonator, and improve power capacity of the device.
Referring to an alternative circuit example diagram of still another filter shown in fig. 14, in the filter, 3 series-stage resonant cells Se201, se202, and Se203,3 parallel-stage resonant cells Sh201, sh202, and Sh203 are included, wherein an inductance G201 is commonly connected in series between a first-stage parallel resonant cell Sh201 and a second-stage parallel resonant cell Sh202 and a ground terminal, and an inductance G202 is connected in series between a third-stage parallel resonant cell Sh203 and the ground terminal;
wherein the first-stage series-stage resonance unit Se201 is a roll-off adjusting resonance unit; at least one of the series-stage resonance units has a base resonator in the series-stage resonance unit connected in series, and in this example, a base resonator in the second-stage series-stage resonance unit Se202 is connected in series; in the parallel-stage resonant units, at least electrodes of the basic resonators in the one-stage parallel-stage resonant unit are connected in parallel in a mixed manner, in the third-stage parallel-resonator Sh203 in this example, electrodes of the basic resonators are connected in a mixed manner, that is, an upper electrode of one basic resonator and a lower electrode of the other basic resonator are electrically connected to one end of the parallel-stage resonant unit, and a lower electrode of one basic resonator and an upper electrode of the other basic resonator are electrically connected to the other end of the parallel-stage resonant unit.
Referring to an alternative circuit example diagram of still another filter shown in fig. 15, in the filter, 3 series-stage resonant cells Se301, se302, and Se303,3 parallel-stage resonant cells Sh301, sh302, and Sh303 are included, wherein an inductance G301 is commonly connected in series between the first-stage parallel resonant cell Sh301 and the second-stage parallel resonant cell Sh302 and the ground terminal, and an inductance G302 is connected in series between the third-stage parallel resonant cell Sh303 and the ground terminal;
wherein the third-stage series-stage resonance unit Se303 is a roll off adjustment resonance unit; at least one of the series-stage resonance units has a base resonator in the series-stage resonance unit connected in series, and in this example, a base resonator in the second-stage series-stage resonance unit Se302 is connected in series; in the parallel-stage resonant units, at least electrodes of the basic resonators in the one-stage parallel-stage resonant unit are connected in parallel in a mixed manner, in the third-stage parallel-resonator Sh303 in this example, electrodes of the basic resonators are connected in a mixed manner, that is, an upper electrode of one basic resonator and a lower electrode of the other basic resonator are electrically connected to one end of the parallel-stage resonant unit, and a lower electrode of one basic resonator and an upper electrode of the other basic resonator are electrically connected to the other end of the parallel-stage resonant unit.
In a further embodiment of the present invention, there is also provided a terminal including the filter described in the above embodiment.
In a further embodiment of the present invention, there is also provided a base station, which includes the filter described in the above embodiment.
The foregoing describes several embodiments of the present invention, and the various alternatives presented by the various embodiments may be combined, cross-referenced, with each other without conflict, extending beyond what is possible embodiments, all of which are considered to be embodiments of the present invention disclosed and disclosed.
Although the embodiments of the present invention are disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.
Claims (20)
1. A filter, comprising:
at least one series-stage resonant cell;
at least one parallel stage resonant cell;
the at least one serial-stage resonance unit is a roll-off adjusting resonance unit, the roll-off adjusting resonance unit comprises a first roll-off adjusting resonator and a second roll-off adjusting resonator which are connected in parallel, the difference between parallel resonance frequencies and/or the difference between serial resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator is greater than or equal to the passband bandwidth of the filter, and the parallel resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator are between the passband and the stopband of the filter.
2. The filter according to claim 1, characterized in that in the roll-off adjusting resonator unit, a difference in parallel resonance frequency and/or a difference in series resonance frequency of the first roll-off adjusting resonator and the second roll-off adjusting resonator is greater than or equal to 1.1 times a passband bandwidth of the filter.
3. The filter according to claim 2, wherein an upper electrode of the first roll-off adjustment resonator and a lower electrode of the second roll-off adjustment resonator are electrically connected to one end of the roll-off adjustment resonance unit, and a lower electrode of the first roll-off adjustment resonator and an upper electrode of the second roll-off adjustment resonator are electrically connected to the other end of the roll-off adjustment resonance unit.
4. The filter according to claim 2, wherein upper electrodes of the first and second roll-off adjustment resonators are electrically connected to one end of the roll-off adjustment resonance unit, and lower electrodes of the first and second roll-off adjustment resonators are electrically connected to the other end of the roll-off adjustment resonance unit.
5. The filter according to claim 3 or 4, wherein at least one parallel stage resonance unit includes a plurality of parallel basic resonators, and upper electrodes of at least 2 basic resonators are electrically connected to one end of the parallel stage resonance unit, and lower electrodes of the 2 basic resonators are electrically connected to the other end of the parallel stage resonance unit;
or alternatively, the process may be performed,
the at least one parallel stage resonant unit comprises a plurality of parallel basic resonators, wherein the upper electrode of at least one basic resonator and the lower electrode of another basic resonator are electrically connected to one end of the parallel stage resonant unit, and the lower electrode of at least one basic resonator and the upper electrode of the other basic resonator are electrically connected to the other end of the parallel stage resonant unit.
6. The filter according to claim 3 or 4, wherein at least one of the series-stage resonator units includes a plurality of base resonators connected in series, and wherein an upper electrode of at least one of the base resonators is electrically connected to an upper electrode of another base resonator;
or alternatively, the process may be performed,
at least one series-stage resonance unit comprises a plurality of series basic resonators, and the upper electrode of at least one basic resonator is electrically connected with the lower electrode of the other basic resonator in the series basic resonators.
7. The filter of claim 1, wherein there are at least 1 transmission zero in a predetermined frequency band of the filter, the predetermined frequency band being [2f0-1ghz,2f0+1ghz ], wherein f0 is a passband center frequency of the filter.
8. The filter according to claim 7, wherein in the roll-off adjusting resonance unit, a ratio of a difference between parallel resonance frequencies of the first roll-off adjusting resonator and the second roll-off adjusting resonator to a center frequency of the filter is greater than or equal to 0.02.
9. The filter of claim 7, wherein in the filter, the last stage resonant unit is a parallel stage resonant unit, wherein the last stage resonant unit is a last stage resonant unit electrically connected to an output of the filter.
10. The filter of claim 9, wherein a final inductor is independently coupled in series between the final resonant element and ground, the final inductor having an inductance value greater than the inductance values of the other inductors within the filter.
11. The filter of claim 1, wherein the series-stage resonant unit and the parallel-stage resonant unit include therein a base resonator, the base resonator comprising: a substrate, a lower electrode on the substrate, a piezoelectric layer conformally covering the lower electrode, and an upper electrode on the piezoelectric layer; wherein the thickness of the piezoelectric layer is 0.4um to 0.7um.
12. The filter of claim 1, wherein the number of series-stage resonant cells is greater than or equal to 2 and the number of parallel-stage resonant cells is greater than or equal to 3;
the second-stage series-connection stage resonance unit is the roll off adjusting resonance unit.
13. The filter of claim 12, wherein the number of series-stage resonant cells is 3 and the number of parallel-stage resonant cells is 3;
the parallel stage resonance unit comprises at least one stage of parallel stage resonance unit, wherein the upper electrode of one basic resonator and the lower electrode of the other basic resonator are electrically connected to one end of the parallel stage resonance unit, and the lower electrode of one basic resonator and the upper electrode of the other basic resonator are electrically connected to the other end of the parallel stage resonance unit.
14. The filter of claim 13, wherein the first stage series-stage resonating cells and the base resonators are connected in series.
15. The filter of claim 1, wherein the number of series-stage resonant cells is greater than or equal to 2 and the number of parallel-stage resonant cells is greater than or equal to 3;
the first-stage series-connection stage resonance unit is the roll-off adjusting resonance unit.
16. The filter of claim 15, wherein the number of series-stage resonant cells is 3 and the number of parallel-stage resonant cells is 3;
wherein, the basic resonator in the at least one-stage series-connection stage resonance unit is connected in series;
in the parallel-stage resonant unit with at least one stage, the upper electrode of one basic resonator and the lower electrode of the other basic resonator are electrically connected to one end of the parallel-stage resonant unit, and the lower electrode of one basic resonator and the upper electrode of the other basic resonator are electrically connected to the other end of the parallel-stage resonant unit.
17. The filter of claim 1, wherein the number of series-stage resonant cells is greater than or equal to 2 and the number of parallel-stage resonant cells is greater than or equal to 3;
and the third-stage series-connection stage resonance unit is the roll-off adjusting resonance unit.
18. The filter of claim 17, wherein the number of series-stage resonant cells is 3 and the number of parallel-stage resonant cells is 3;
wherein, the basic resonator in the at least one-stage series-connection stage resonance unit is connected in series;
in the parallel-stage resonant unit with at least one stage, the upper electrode of one basic resonator and the lower electrode of the other basic resonator are electrically connected to one end of the parallel-stage resonant unit, and the lower electrode of one basic resonator and the upper electrode of the other basic resonator are electrically connected to the other end of the parallel-stage resonant unit.
19. A terminal, characterized in that it comprises a filter according to any one of claims 1 to 18.
20. A base station, characterized in that it comprises the filter according to any one of claims 1 to 18.
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| CN202211663162.4A CN116192081B (en) | 2022-12-23 | 2022-12-23 | Filter, terminal and base station |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111371407A (en) * | 2020-03-18 | 2020-07-03 | 诺思(天津)微系统有限责任公司 | Method for adjusting resonance frequency, filter, multiplexer and communication equipment |
| CN112953432A (en) * | 2021-02-03 | 2021-06-11 | 苏州汉天下电子有限公司 | Band-stop filter |
| CN114244314A (en) * | 2021-12-14 | 2022-03-25 | 苏州汉天下电子有限公司 | Filter and multiplexer including same |
| CN114301424A (en) * | 2021-12-31 | 2022-04-08 | 苏州汉天下电子有限公司 | Band-pass filter and duplexer |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111371407A (en) * | 2020-03-18 | 2020-07-03 | 诺思(天津)微系统有限责任公司 | Method for adjusting resonance frequency, filter, multiplexer and communication equipment |
| CN112953432A (en) * | 2021-02-03 | 2021-06-11 | 苏州汉天下电子有限公司 | Band-stop filter |
| CN114244314A (en) * | 2021-12-14 | 2022-03-25 | 苏州汉天下电子有限公司 | Filter and multiplexer including same |
| CN114301424A (en) * | 2021-12-31 | 2022-04-08 | 苏州汉天下电子有限公司 | Band-pass filter and duplexer |
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