Broadband hybrid high-roll-off low-pass filter unit, broadband hybrid high-roll-off low-pass filter circuit, and related device

Abstract

The present invention relates to the technical field of communication circuits, and specifically to a broadband hybrid high-roll-off low-pass filter unit, a broadband hybrid high-roll-off low-pass filter circuit, and a related device. The filter unit comprises an input end, an output end, and a primary signal path and a secondary signal path that are arranged in parallel between the input end and the output end; the primary signal path is provided with an LC low-pass filter; the secondary signal path is provided with an acoustic resonator and an LC filter that are connected in series; moreover, after signals of the same target frequency respectively pass through the primary signal path and the secondary signal path, the phase difference of the signals is 180 degrees, and the target frequency is located in a transition band of the LC low-pass filter. In this way, when the unit is used for filtering, the unit not only has the advantage of large broadband of the LC low-pass filter, but also can form a plurality of transmission zero points because the phase difference of the signals of the target frequency is 180 degrees and vector cancellation is realized after the signals respectively pass through the primary signal path and the secondary signal path, thereby achieving the purpose of improving the roll-off of the transition band, and satisfying the requirements for a large bandwidth and high roll-off.

Description

Wideband hybrid high roll-off low pass filter unit, filter circuit and related equipment TECHNICAL FIELD

[0001] The present application relates to the technical field of communication circuit, in particular to a wideband hybrid high roll-off low pass filter unit, filter circuit and related equipment. BACKGROUND

[0002] With the rapid growth of wireless communication demand such as satellite, navigation, cellular phone, modern wireless communication technology promotes the development of high frequency components, giving birth to higher frequency, larger bandwidth and faster data communication applications. Among them, acoustic filter uses the characteristic that the wavelength of acoustic wave is much smaller than that of electromagnetic wave, which can achieve the requirements of light, thin, short and small, and becomes a new solution for developing high-performance filters.

[0003] And with the expansion of new application frequency band, 5G communication puts forward more urgent demand for large bandwidth high roll-off radio frequency filter. However, the traditional acoustic filter can only work in narrow band, and the bandwidth is difficult to break through 10%. At the same time, the commonly used LC filter can realize wide bandwidth, but its edge roll-off suppression performance is poor, which cannot better meet the current demand, therefore, how to realize high roll-off in the premise of realizing large bandwidth becomes a problem to be solved. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a wideband hybrid high roll-off low pass filter unit, filter circuit and related equipment to overcome the problem that the current radio frequency filter cannot meet the performance requirements of wide and narrow band and high roll-off at the same time.

[0005] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] In the first aspect, the present application provides a wideband hybrid high roll-off low pass filter unit, comprising: an input end, an output end, and a main signal path and a secondary signal path arranged between the input end and the output end;

[0007] An LC low pass filter is arranged on the main signal path;

[0008] An acoustic resonator and an LC filter are arranged on the secondary signal path, and the acoustic resonator and the LC filter are connected in series;

[0009] The main signal path and the secondary signal path are connected in parallel, and the phase difference of the signal at the same target frequency after passing through the main signal path and the secondary signal path is a target value, the target frequency is located in the transition band of the LC low pass filter, and the target value includes 180°.

[0010] Further, in some embodiments of the present application, the target value is in the range of 180°±30°.

[0011] Further, in some embodiments of the present application, the LC low-pass filter is in any one of a single-inductor type, an L type, a T type, and a π type.

[0012] Further, in some embodiments of the present application, the LC low-pass filter is in a combination of one or more of a single-inductor type, an L type, a T type, and a π type.

[0013] Further, in some embodiments of the present application, the LC filter is in any one of a single-inductor type, an L type, a T type, and a π type.

[0014] Further, in some embodiments of the present application, the LC filter is in a combination of one or more of a single-inductor type, an L type, a T type, and a π type.

[0015] Further, in some embodiments of the present application, the LC filter is a low-pass filter, a high-pass filter, or a band-pass filter.

[0016] Further, in some embodiments of the present application, the LC filter includes an inorganic material type and an organic material type, the inorganic material type includes a ceramic type and a semiconductor type, and the organic material type includes a PCB type.

[0017] Further, in some embodiments of the present application, the acoustic resonator includes a surface acoustic wave resonator, a film bulk acoustic resonator, a solidly mounted resonator, a Lamb wave resonator, and a transversely excited bulk acoustic wave resonator.

[0018] Further, in some embodiments of the present application, the number of the secondary signal paths is at least one, each of the secondary signal paths is in parallel with the primary signal path, and each of the secondary signal paths is in parallel with the other secondary signal paths.

[0019] Further, in some embodiments of the present application, the target frequencies corresponding to the primary signal path and the secondary signal paths are the same.

[0020] Further, in some embodiments of the present application, the target frequencies corresponding to the primary signal path and the secondary signal paths are different.

[0021] In a second aspect, the embodiments of the present application further provide a wideband hybrid high roll-off low pass filter circuit, comprising at least one wideband hybrid high roll-off low pass filter unit as described above, and when there are multiple wideband hybrid high roll-off low pass filter units, the multiple wideband hybrid high roll-off low pass filter units are connected in series.

[0022] Further, in some embodiments of the present application, the target frequencies corresponding to the multiple wideband hybrid high roll-off low pass filter units are the same.

[0023] Further, in some embodiments of the present application, the target frequencies corresponding to the multiple wideband hybrid high roll-off low pass filter units are different.

[0024] Further, in some embodiments of the present application, the number of target frequencies corresponding to the multiple wideband hybrid high roll-off low pass filter units is the same.

[0025] Further, in some embodiments of the present application, the number of target frequencies corresponding to the multiple wideband hybrid high roll-off low pass filter units is different.

[0026] In a third aspect, the embodiments of the present application further provide a wideband hybrid high roll-off low pass filter, comprising a wideband hybrid high roll-off low pass filter circuit as described above.

[0027] In a fourth aspect, the embodiments of the present application further provide a communication module, comprising a wideband hybrid high roll-off low pass filter as described above.

[0028] In a fifth aspect, the embodiments of the present application further provide a communication device, comprising a communication module as described above.

[0029] The present application relates to the technical field of communication circuit, in particular to a wideband hybrid high roll-off low pass filter unit, a filter circuit and related devices, the filter unit comprising: an input end, an output end, and a main signal path and a secondary signal path arranged between the input end and the output end; an LC low pass filter is arranged on the main signal path; an acoustic resonator and an LC filter are arranged on the secondary signal path, and the acoustic resonator and the LC filter are connected in series; the main signal path and the secondary signal path are connected in parallel, and the phase difference of a signal at a same target frequency after passing through the main signal path and the secondary signal path is a target value, the target frequency is located in a transition band of the LC low pass filter, and the target value includes 180°. In this way, when the unit is applied to a filter circuit, not only the advantages of a large wideband of the LC low pass filter are achieved, but also multiple transmission zeros can be formed because the phase difference of the signal after passing through the main signal path and the secondary signal path is 180°, so that the purpose of improving the roll-off of the transition band is achieved, and the requirements of large bandwidth and high roll-off are met. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0031] Fig. 1 is a circuit diagram of a wideband hybrid high roll-off low-pass filter unit provided by an embodiment of the present application;

[0032] Fig. 2 is a phase difference curve diagram of a main signal path and a secondary signal path in the wideband hybrid high roll-off low-pass filter unit provided by an embodiment of the present application;

[0033] Fig. 3 is a unit performance curve diagram of the wideband hybrid high roll-off low-pass filter unit provided by an embodiment of the present application;

[0034] Fig. 4 is a circuit diagram of an LC low-pass filter in the main signal path in the wideband hybrid high roll-off low-pass filter unit provided by an embodiment of the present application;

[0035] Fig. 5 is a circuit diagram of an LC filter in the secondary signal path in the wideband hybrid high roll-off low-pass filter unit provided by an embodiment of the present application;

[0036] Fig. 6 is a specific circuit structure diagram of the wideband hybrid high roll-off low-pass filter unit provided by an embodiment of the present application;

[0037] Fig. 7 is a specific circuit structure diagram of the wideband hybrid high roll-off low-pass filter unit provided by another embodiment of the present application;

[0038] Fig. 8 is a specific circuit structure diagram of the wideband hybrid high roll-off low-pass filter unit provided by still another embodiment of the present application;

[0039] Fig. 9 is a specific circuit structure diagram of the wideband hybrid high roll-off low-pass filter unit provided by still another embodiment of the present application;

[0040] Fig. 10 is a specific circuit structure diagram of the wideband hybrid high roll-off low-pass filter unit provided by still another embodiment of the present application;

[0041] Fig. 11 is a circuit diagram of a wideband hybrid high roll-off low-pass filter unit provided by another embodiment of the present application;

[0042] Fig. 12 is a circuit structure diagram of the wideband hybrid high roll-off low-pass filter unit provided by an embodiment of the present application;

[0043] Fig. 13 is a specific circuit structure diagram of a wideband hybrid high roll-off low-pass filter circuit provided by an embodiment of the present application;

[0044] Figure 14 is a specific circuit structure diagram of a wideband hybrid high roll-off low pass filter circuit provided by another embodiment of the present application;

[0045] Figure 15 is a specific circuit structure diagram of a wideband hybrid high roll-off low pass filter circuit provided by another embodiment of the present application;

[0046] Figure 16 is a specific circuit structure diagram of a wideband hybrid high roll-off low pass filter circuit provided by another embodiment of the present application;

[0047] Figure 17 is a specific circuit structure diagram of a wideband hybrid high roll-off low pass filter circuit provided by another embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0049] Filter unit embodiments:

[0050] Figure 1 is a circuit diagram of a wideband hybrid high roll-off low pass filter unit provided by an embodiment of the present application. Referring to Figure 1, the wideband hybrid high roll-off low pass filter unit provided by the embodiment includes an input end, an output end, and a main signal path and a secondary signal path arranged between the input end and the output end.

[0051] Among them, the LC low pass filter 20 is arranged on the main signal path; the acoustic resonator 10 and the LC filter 30 are arranged on the secondary signal path, and the acoustic resonator 10 is in series with the LC filter 20; the main signal path and the secondary signal path are in parallel, and the phase difference of the signal of the same target frequency after passing through the main signal path and the secondary signal path is a target value, the target frequency is located in the transition band of the LC low pass filter 20, and the target value includes 180°.

[0052] Specifically, as shown in Figure 1, in the embodiment of the present application, the two ends of the secondary signal path of the wideband hybrid high roll-off low pass filter unit are connected to the first end and the last end of the main signal path, so that when the input end inputs a signal such as a radio frequency signal, the signal will pass through the main signal path and the secondary signal path respectively.

[0053] In practical applications, the inductance and capacitance values of the LC low-pass filter 20 in the main signal path can be adjusted to achieve a low-pass filter design with a large bandwidth in the target frequency band (generally, the inductance and capacitance values in an LC filter are inversely proportional to the operating frequency, that is, the higher the operating frequency, the smaller the capacitance and inductance values). At the same time, the inductance and capacitance values of the LC filter 30 in the secondary signal path and the position of the series resonance frequency point of the acoustic resonator 10 are adjusted to adjust the position of the zero transmission point, at which the phase difference of the signal after passing through the main signal path and the secondary signal path reaches a target value in the transition band. It should be noted that the target value is preferably 180°, but in practical applications, due to differences or losses in the performance of circuit devices, the target value can be adjusted appropriately, for example, the target value can be in the range of 180°±30°.

[0054] It should be noted that for a signal of the target frequency, the phase difference after passing through the main signal path and the secondary signal path is 180°, at which point the signal after passing through the main signal path and the secondary signal path is vectorially canceled out, thereby forming multiple transmission zero points for the transmission of the radio frequency signal, achieving a steep roll-off characteristic of the low-pass filter, that is, a high roll-off. In practical applications, by precisely adjusting the position of the series resonance frequency point of the acoustic resonator 10 in the secondary signal path, the position of the transmission zero point can be adjusted, and the target frequency can be set in the transition band between the passband and the stopband of the LC low-pass filter 20, thereby forming a frequency point (i.e., the target frequency) with a phase difference of 180° in the transition band between the passband and the stopband after the radio frequency signal passes through the main signal path and the secondary signal path, corresponding to a transmission zero point, achieving a steep roll-off characteristic of the low-pass filter in the transition band.

[0055] In practical applications, by adjusting the above parameters, at least two frequency points with a phase difference of 180° can be formed in the transition band between the passband and the stopband of the LC low-pass filter after the radio frequency signal passes through the main signal path and the secondary signal path, corresponding to two transmission zero points, as shown in FIG. 2. By forming multiple transmission zero points, the roll-off of the transition band between the passband and the stopband is improved.

[0056] FIG. 3 is a unit performance curve of the wideband hybrid high-rolloff low-pass filter unit provided by the embodiment of the present application, specifically, a performance curve comparison diagram of the wideband hybrid high-rolloff low-pass filter unit provided by the above embodiment of the present application and a common LC low-pass filter. As shown in FIG. 3, the drop from the passband to the stopband of the conventional LC filter is very slow, and the roll-off performance is poor. The wideband hybrid high-rolloff low-pass filter unit provided by the present application has a phase difference of 180° between the main signal path and the secondary signal path in the transition band, which enables the wideband hybrid high-rolloff low-pass filter unit to achieve multiple transmission zero points in the transition band, thereby achieving extremely high roll-off performance.

[0057] Further, in the present application, the type of acoustic resonator 10 can include a variety, for example, can be selected surface wave resonator, film bulk acoustic resonator, solid assembly type resonator, Lamb wave resonator or transversely excited bulk acoustic resonator, can be selected flexibly according to actual needs.

[0058] The structure of the LC low-pass filter 20 can be any one or a combination of multiple of single inductance type, L type, T type and π type low-pass filter structures, which can be selected flexibly according to actual needs.

[0059] Specifically, FIG. 4 is a circuit diagram of the LC low-pass filter in the main signal path of the wideband hybrid high roll-off low-pass filter unit provided by the embodiment of the present application. First, in the embodiment of the present application, the structure of the LC low-pass filter 20 can be any one of single inductance type, L type, T type and π type low-pass filter structures, as shown in 21-25 in FIG. 4, 21-25 are single inductance low-pass filter structure 21, π type low-pass filter structure 22, T type low-pass filter structure 23 and L type low-pass filter variant structure one 24, L type low-pass filter variant structure two 25 respectively; in other embodiments of the present application, the structure of the LC low-pass filter 20 can also be any combination of single inductance type, L type, T type and π type low-pass filter, that is, a combination of single or multiple cascades of the above structures, such as combination structure 26 in FIG. 4.

[0060] Further, in the present application, the LC filter 30 mentioned in the above embodiment can be a low-pass filter, a high-pass filter or a band-pass filter.

[0061] Specifically, when the LC filter 30 selects a low-pass filter, it can adopt any combination of the same structure as the above LC low-pass filter 20; when the LC filter 30 selects a high-pass filter, its structure can be any one of L type, T type and π type filter structure, such as 31-34 in FIG. 5, 31-34 are π type high-pass filter structure 31, T type high-pass filter structure 32 and L type high-pass filter structure variant one 33 and L type high-pass filter structure variant two 34 respectively, and can also be any combination of the above structures, that is, a combination of single or multiple cascades of the above structures, such as combination structure 35 in FIG. 5.

[0062] Further, in the present application, the LC filter 30 in the wideband hybrid high roll-off low-pass filter unit includes inorganic material type and organic material type, wherein the inorganic material type includes ceramic type and semiconductor type, and the organic material type includes PCB type, that is, the types of LC filter 30 include ceramic, semiconductor, PCB board (LC filter based on PCB board) and other insulating organic or inorganic material type.

[0063] It should be noted that in the wideband hybrid high roll-off low pass filter unit provided in the present application, the LC filter 30 realizes the passband performance of the frequency band, and the inductance and capacitance values are inversely proportional to the working frequency.

[0064] On this basis, the combination of the above LC low pass filter 20 and LC filter 30 also has many kinds, for example, as shown in Figures 6-10, taking the single inductor type structure as an example for the specific structure of the LC low pass filter of the LC filter 30, it can be combined with LC low pass filters 20 of various structures to form a wideband hybrid high roll-off low pass filter unit including one main signal path and one secondary signal path.

[0065] Among them, Figure 6 is a combination of the LC filter 30 adopting a single inductor low pass filter structure (the same as the inductor low pass filter structure 21), and the LC low pass filter 20 adopting a π type low pass filter structure 22; Figure 7 is a combination of the LC filter 30 adopting a single inductor low pass filter structure, and the LC low pass filter 20 adopting a T type low pass filter structure 23; Figure 8 is a combination of the LC filter 30 adopting a single inductor low pass filter structure, and the LC low pass filter 20 adopting an L type low pass filter variant structure one 24; Figure 9 is a combination of the LC filter 30 adopting a single inductor low pass filter structure, and the LC low pass filter 20 adopting an L type low pass filter variant structure two 25; Figure 10 is a combination of the LC filter 30 adopting a single inductor low pass filter structure, and the LC low pass filter 20 adopting a combination structure 26.

[0066] It can be understood that the LC filter 30 can also adopt other low pass filter structures, and adopt the high pass filter structure or the band pass filter structure mentioned above, and the specific selection can be flexibly selected according to actual needs.

[0067] Further, in some embodiments of the present application, each wideband hybrid high roll-off low pass filter unit can include multiple secondary signal paths. Among them, each secondary signal path is connected in parallel with the main signal path, and each secondary signal path is connected in parallel with other secondary signal paths, as shown in Figure 11.

[0068] By connecting the secondary signal paths in parallel in the same wideband hybrid high roll-off low pass filter unit, the same wideband hybrid high roll-off low pass filter unit includes multiple secondary signal paths, which can further suppress the stopband signal and improve the transition band roll-off.

[0069] It should be noted that in some embodiments, the target frequencies corresponding to the main signal path and the plurality of secondary signal paths in the same wideband hybrid high roll-off low-pass filter unit can be the same, that is, the frequency points forming a phase difference of 180° in the transition band between the passband and the stopband after the radio frequency signal passes through the main signal path and each secondary signal path are the same.

[0070] In some embodiments of the present application, the target frequencies corresponding to the main signal path and the plurality of secondary signal paths in the same wideband hybrid high roll-off low-pass filter unit can be different, that is, the frequency points forming a phase difference of 180° in the transition band between the passband and the stopband after the radio frequency signal passes through the main signal path and each secondary signal path are different (but all located in the transition band of the LC low-pass filter), thereby increasing the frequency points forming a phase difference of 180°, improving the effect of suppressing stopband signals and improving the transition band roll-off.

[0071] The wideband hybrid high roll-off low-pass filter unit provided by the present application combines the advantages of LC filters and acoustic filters through the combination of LC filters and acoustic filters: on the one hand, the wideband hybrid high roll-off low-pass filter unit has a large bandwidth of the LC filter, and on the other hand, the wideband hybrid high roll-off low-pass filter unit has the advantage of high roll-off in the transition band of the acoustic filter. It breaks through the disadvantages of low roll-off of traditional LC filters and the bandwidth limitation of acoustic filters, and realizes the characteristics of wide bandwidth and high roll-off.

[0072] Filter circuit embodiment:

[0073] Based on the same inventive concept, the present application also provides a wideband hybrid high roll-off low-pass filter circuit, as shown in FIG. 12, which includes at least one wideband hybrid high roll-off low-pass filter unit in the above wideband hybrid high roll-off low-pass filter unit embodiment, and a plurality of wideband hybrid high roll-off low-pass filter units are connected in series, thereby further improving the stopband suppression and the transition band roll-off on the basis of the wideband hybrid high roll-off low-pass filter unit.

[0074] Specifically, in the wideband hybrid high roll-off low-pass filter circuit provided by the present application, an input terminal, an output terminal, and a plurality of wideband hybrid high roll-off low-pass filter units arranged between the input terminal and the output terminal are included, and a plurality of wideband hybrid high roll-off low-pass filter circuits are connected in series. It can be understood that the input terminal of the first wideband hybrid high roll-off low-pass filter unit in the plurality of wideband hybrid high roll-off low-pass filter circuits connected in series is directly connected to the input terminal of the wideband hybrid high roll-off low-pass filter circuit, and the output terminal of the last wideband hybrid high roll-off low-pass filter unit is directly connected to the output terminal of the wideband hybrid high roll-off low-pass filter circuit.

[0075] Fig. 13-17 are various embodiments of the broadband hybrid high roll-off low pass filter circuit of the present application. As shown in Fig. 13-17, the broadband hybrid high roll-off low pass filter unit in the broadband hybrid high roll-off low pass filter circuit provided by the present application can be various structures mentioned in the above embodiments of the broadband hybrid high roll-off low pass filter unit, including but not limited to: the LC filter 30 in Fig. 13 adopts a single inductor low pass filter structure, while the LC low pass filter 20 adopts a combination of the π-type low pass filter structure 22; the LC filter 30 in Fig. 14 adopts a single inductor low pass filter structure, while the LC low pass filter 20 adopts a combination of the T-type low pass filter structure 23; the LC filter 30 in Fig. 15 adopts a single inductor low pass filter structure, while the LC low pass filter 20 adopts a combination of the L-type low pass filter variant structure one 24; the LC filter 30 in Fig. 16 adopts a single inductor low pass filter structure, while the LC low pass filter 20 adopts a combination of the L-type low pass filter variant structure two 25; the LC filter 30 in Fig. 17 adopts a single inductor low pass filter structure, while the LC low pass filter 20 adopts a combination of the combination structure 26.

[0076] In addition, in some other embodiments of the present application, the same broadband hybrid high roll-off low pass filter circuit can also be composed of broadband hybrid high roll-off low pass filter units of different structure types (i.e., the structure combination of the LC filter 30 and the LC low pass filter 20 in the multiple broadband hybrid high roll-off low pass filter units is different).

[0077] It can be understood that each broadband hybrid high roll-off low pass filter unit provided by the present application has a corresponding target frequency, i.e., the frequency point where the phase difference after passing through the main signal path and the secondary signal path is 180°, thereby forming a transmission zero point, so as to improve the roll-off effect of the transition band of the LC filter unit. On this basis, the target frequencies of the multiple broadband hybrid high roll-off low pass filter units in the broadband hybrid high roll-off low pass filter circuit can be the same, or different target frequencies can be set in order to achieve the effect of multiple frequency points, further improving the effect.

[0078] In addition, the number of target frequencies of the multiple broadband hybrid high roll-off low pass filter units in the broadband hybrid high roll-off low pass filter circuit can also be the same or different (the number of target frequencies of the broadband hybrid high roll-off low pass filter unit mainly depends on the parameters of the acoustic resonator 10 and the LC filter 30 in the broadband hybrid high roll-off low pass filter unit and the number of secondary signal paths), which can be flexibly selected according to actual needs.

[0079] The wideband hybrid high roll-off low-pass filter unit provided by the application is composed of a main signal path and at least one secondary signal path, wherein the main signal path is composed of an LC low-pass filter 20; the secondary signal path is composed of an acoustic resonator 10 and an LC filter 20 in series; and the single secondary signal path can be expanded into multiple secondary signal paths, the signal phase difference after the main signal path and the secondary signal path is 180°, multiple transmission zeros are formed, the purpose of improving the roll-off of the filter transition band is achieved, the wideband hybrid high roll-off low-pass filter unit has the low-pass filtering function and has better out-of-band suppression performance. Meanwhile, multiple wideband hybrid high roll-off low-pass filter units can be combined in series to form a wideband hybrid high roll-off low-pass filter circuit, and the out-of-band suppression performance can be further improved.

[0080] Filter embodiment:

[0081] Based on the same inventive concept, the application further provides a wideband hybrid high roll-off low-pass filter, wherein the wideband hybrid high roll-off low-pass filter is provided with the wideband hybrid high roll-off low-pass filter unit mentioned in the filter unit embodiment or the wideband hybrid high roll-off low-pass filter circuit mentioned in the filter circuit embodiment.

[0082] Communication module embodiment:

[0083] Based on the same inventive concept, the application further provides a communication module, wherein the communication module is provided with the wideband hybrid high roll-off low-pass filter mentioned in the filter embodiment.

[0084] Communication device embodiment:

[0085] Based on the same inventive concept, the application further provides a communication device, wherein the communication device is provided with the communication module mentioned in the communication module embodiment.

[0086] It can be understood that the same or similar parts in the above-mentioned embodiments can be mutually referred to, and the content not described in detail in some embodiments can be referred to the same or similar content in other embodiments.

[0087] It should be noted that, in the description of the application, the terms "first", "second", etc. are only used for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, in the description of the application, unless otherwise specified, the meaning of "multiple" is at least two.

[0088] Any procedural or methodological descriptions in flow charts or otherwise described herein can be understood to represent modules, segments, or portions of code that include executable instructions for implementing the specific logical functions or steps, and the scope of preferred embodiments of the present application includes additional implementations in which the functions are performed in a different order, including substantially simultaneously, or in reverse order, as will be understood by those skilled in the art to which embodiments of the present application pertain.

[0089] It should be understood that portions of the present application can be realized with hardware, software, firmware or a combination thereof. In the above embodiments, a plurality of steps or methods can be realized as software or firmware to be executed by a suitable instruction-executing system and stored in a storage. For example, if realized with hardware, and as in another embodiment, it can be realized with any one or a combination of the following technologies known in the art: discrete logic circuit having logic gates for implementing logic functions on data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), etc.

[0090] Those skilled in the art can understand that all or part of the steps carried out by the above-mentioned embodiments can be instructed by a program to complete the relevant hardware, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one of the steps of the method embodiments or a combination thereof.

[0091] In addition, each functional unit in each embodiment of the present application can be integrated into one processing module, or each unit can exist physically independently, or two or more units can be integrated into one module. The above-mentioned integrated module can be realized in the form of hardware or in the form of a software functional module. When the integrated module is realized in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0092] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0093] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0094] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that variations, modifications, substitutions and changes can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A wideband hybrid high-rolloff low-pass filter unit, characterized by, The wideband hybrid high roll-off low pass filter unit comprises: an input end, an output end, and a main signal path and a secondary signal path arranged between the input end and the output end; an LC low pass filter is arranged on the main signal path; an acoustic resonator and an LC filter are arranged on the secondary signal path, and the acoustic resonator and the LC filter are in series; the main signal path and the secondary signal path are in parallel, and the phase difference of a signal at a same target frequency after passing through the main signal path and the secondary signal path is a target value, the target frequency is located in a transition band of the LC low pass filter, and the target value comprises 180°.

2. The wideband hybrid high-rolloff low-pass filter unit of claim 1, wherein, The target value is in a range of 180°±30°.

3. The wideband hybrid high-rolloff low-pass filter unit of claim 1, wherein, The LC low pass filter is in any one of single-inductor, L-type, T-type, and π-type low pass filter structures.

4. The wideband hybrid high-rolloff low-pass filter unit of claim 1, wherein, The LC low pass filter is in a combination of one or more of single-inductor, L-type, T-type, and π-type low pass filter structures.

5. The wideband hybrid high-rolloff low-pass filter cell of claim 1, wherein, The LC filter is in any one of single-inductor, L-type, T-type, and π-type filter structures.

6. The wideband hybrid high-pass low-pass filter cell of claim 1, wherein, The LC filter is in a combination of one or more of single-inductor, L-type, T-type, and π-type filter structures.

7. The wideband hybrid high-pass low-pass filter cell of claim 1, wherein, The LC filter is a low pass filter, a high pass filter, or a band pass filter.

8. The wideband hybrid high-pass low-pass filter cell of claim 1, wherein, The LC filter comprises inorganic material types and organic material types, the inorganic material types comprise ceramic types and semiconductor types, and the organic material types comprise PCB types.

9. The wideband hybrid high-pass low-pass filter cell of claim 1, wherein, The acoustic resonator types comprise surface wave resonators, film bulk acoustic resonators, solid assembly resonators, Lamb wave resonators, and transverse excitation bulk acoustic resonators.

10. The wideband hybrid high-pass low-pass filter cell of claim 1, wherein, The number of the secondary signal paths is at least one, when a plurality of the secondary signal paths exist, each of the secondary signal paths is in parallel with the main signal path, and each of the secondary signal paths is in parallel with other secondary signal paths.

11. The wideband hybrid high-rolloff low-pass filter cell of claim 10, wherein, The plurality of the secondary signal paths correspond to a same target frequency as the main signal path.

12. The wideband hybrid high-pass low-pass filter cell of claim 10, wherein, The plurality of the secondary signal paths correspond to different target frequencies as the main signal path.

13. A wideband hybrid high-rolloff low-pass filter circuit, comprising: The wideband hybrid high roll-off low pass filter unit comprises at least one of the wideband hybrid high roll-off low pass filter units according to any one of claims 1-12, and when a plurality of the wideband hybrid high roll-off low pass filter units exist, the plurality of the wideband hybrid high roll-off low pass filter units are in series.

14. The wideband hybrid high-pass low-pass filter circuit of claim 13, wherein, The plurality of the wideband hybrid high roll-off low pass filter units correspond to a same target frequency.

15. The wideband hybrid high-pass low-pass filter circuit of claim 13, wherein, The plurality of the wideband hybrid high roll-off low pass filter units correspond to different target frequencies.

16. The wideband hybrid high-pass low-pass filter circuit of claim 13, wherein, The number of the target frequencies corresponding to the plurality of the wideband hybrid high roll-off low pass filter units is the same.

17. The wideband hybrid high-pass low-pass filter circuit of claim 13, wherein, The number of the target frequencies corresponding to the plurality of the wideband hybrid high roll-off low pass filter units is different.

18. A wideband hybrid high-rolloff lowpass filter, comprising: The wideband hybrid high roll-off low pass filter circuit comprises the wideband hybrid high roll-off low pass filter units according to any one of claims 13-17.

19. A communications module, characterized by The wideband hybrid high roll-off low pass filter comprises the wideband hybrid high roll-off low pass filter units according to claim 18.

20. A communications device, characterized by The communication module comprises the wideband hybrid high roll-off low pass filter units according to claim 19.

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