Broadband hybrid high roll-down pass-through filtering unit, filtering circuit and related equipment

Abstract

The invention relates to the technical field of communication circuits, in particular to a broadband hybrid high roll-down pass-through filtering unit, a filtering circuit and related equipment, and the filtering unit comprises an input end, an output end, and a main signal path and a secondary signal path which are arranged between the input end and the output end and are connected in parallel; an LC low-pass filter is arranged on the main signal path; an acoustic resonator and an LC filter which are connected in series are arranged on the secondary signal path; the phase difference of signals of the same target frequency is 180 degrees after the signals pass through the main signal path and the secondary signal path, and the target frequency is located in a transition zone of the LC low-pass filter. Thus, when the unit is applied to filtering, the unit not only has the advantage of large broadband of an LC low-pass filter, but also can form a plurality of transmission zeros due to the fact that the signal phase difference of a target frequency signal after passing through a main signal path and a secondary signal path is 180 degrees and vectors cancel, thereby achieving the purpose of improving the roll-off of a transition zone. And meanwhile, the requirements of large bandwidth and high roll-off are met.

Description

Technical Field

[0001] The present invention relates to the technical field of communication circuits, and in particular to a broadband hybrid high-roll-off low-pass filter unit, a filter circuit and related equipment. Background Art

[0002] With the rapid growth of wireless communication needs such as satellite, navigation, and cellular phones, modern wireless communication technology has promoted the development of high-frequency components, giving rise to communication applications with higher frequencies, larger bandwidths, and faster data. Among them, acoustic filters use the characteristics of acoustic wavelengths being much smaller than electromagnetic wavelengths to meet the requirements of being light, thin, short, and small, becoming a new solution for the development of high-performance filters.

[0003] With the expansion of new application frequency bands, 5G communications have put forward more urgent demands for RF filters with large bandwidth and high roll-off. However, traditional acoustic filters can only work in narrow bands, and the bandwidth is difficult to exceed 10%. At the same time, the commonly used LC filters can achieve wide bandwidth, but their edge roll-off suppression performance is poor and cannot meet current needs well. Therefore, how to achieve high roll-off in the filter transition band while achieving large bandwidth has become an urgent problem to be solved. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a broadband hybrid high roll-off low-pass filter unit, a filter circuit and related equipment to overcome the problem that current radio frequency filters cannot simultaneously meet the performance requirements of wide and narrow bands and high roll-off.

[0005] To achieve the above objectives, the present invention adopts the following technical solutions:

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

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

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

[0009] The main signal path is connected in parallel with the secondary signal path, and the phase difference of the signal with 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] Furthermore, in some embodiments of the present application, the target value has a value range of 180°±30°.

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

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

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

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

[0015] Furthermore, 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] Furthermore, 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] Furthermore, in some embodiments of the present application, the types of the acoustic resonator include: surface wave resonator, film bulk acoustic wave resonator, solid-mounted resonator, Lamb wave resonator and transversely excited bulk acoustic wave resonator.

[0018] Furthermore, in some embodiments of the present application, the number of the secondary signal path is at least one. When there are multiple secondary signal paths, each of the secondary signal paths is connected in parallel with the main signal path, and each of the secondary signal paths is connected in parallel with other secondary signal paths.

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

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

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

[0022] Furthermore, in some embodiments of the present application, the target frequencies corresponding to the plurality of broadband hybrid high roll-off low pass filter units are all the same.

[0023] Furthermore, in some embodiments of the present application, the target frequencies corresponding to the multiple broadband 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 broadband hybrid high roll-off low pass filter units is the same.

[0025] Furthermore, in some embodiments of the present application, the plurality of broadband hybrid high roll-off low pass filter units correspond to different numbers of target frequencies.

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

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

[0028] In a fifth aspect, an embodiment of the present application also provides a communication device, comprising the communication module as described above.

[0029] The present invention relates to the field of communication circuit technology, and in particular to a broadband hybrid high roll-off low-pass filter unit, a filter circuit and related equipment, wherein the 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 is connected in series with the LC filter; the main signal path is connected in parallel with the secondary signal path, 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, and the target frequency is located in the transition band of the LC low-pass filter, and the target value includes 180°. In this way, when the unit is applied to the filter circuit, it not only has the advantage of a large bandwidth of the LC low-pass filter, but also, because the signal phase difference after passing through the main signal path and the secondary signal path is 180°, multiple transmission zeros can be formed, thereby achieving the purpose of improving the transition band roll-off, and meeting the requirements of large bandwidth and high roll-off at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 is a circuit diagram of a broadband hybrid high roll-off low pass filter unit provided by an embodiment of the present invention;

[0032] Figure 2 A phase difference curve diagram of a main signal path and a secondary signal path in a broadband hybrid high roll-off low pass filter unit provided in an embodiment of the present invention;

[0033] Figure 3 A unit performance curve diagram of a broadband hybrid high roll-off low pass filter unit provided in an embodiment of the present invention;

[0034] Figure 4 A circuit diagram of an LC low-pass filter in a main signal path of a broadband hybrid high-roll-off low-pass filter unit provided in an embodiment of the present invention;

[0035] Figure 5 A circuit diagram of an LC filter in a secondary signal path of a broadband hybrid high roll-off low pass filter unit provided by an embodiment of the present invention;

[0036] Figure 6 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter unit provided in an embodiment of the present invention;

[0037] Figure 7 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter unit provided by another embodiment of the present invention;

[0038] Figure 8 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter unit provided by yet another embodiment of the present invention;

[0039] Fig. 9 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter unit provided by yet another embodiment of the present invention;

[0040] Fig.10 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter unit provided by yet another embodiment of the present invention;

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

[0042] Fig.12A circuit structure diagram of a broadband hybrid high roll-off low pass filter unit provided in an embodiment of the present invention;

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

[0044] Fig.14 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter circuit provided by another embodiment of the present invention;

[0045] Fig.15 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter circuit provided by yet another embodiment of the present invention;

[0046] Fig.16 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter circuit provided by yet another embodiment of the present invention;

[0047] Fig.17 A specific circuit structure diagram of a broadband hybrid high roll-off low pass filter circuit provided by yet another embodiment of the present invention. DETAILED DESCRIPTION

[0048] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0049] Filter unit embodiment:

[0050] Figure 1 is a circuit diagram of a broadband hybrid high roll-off low pass filter unit provided by an embodiment of the present invention, please refer to Figure 1 The broadband hybrid high roll-off low pass filter unit provided in this 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, an LC low-pass filter 20 is arranged on the main signal path; an acoustic resonator 10 and an LC filter 30 are arranged on the secondary signal path, and the acoustic resonator 10 and the LC filter 20 are connected in series; the main signal path and the secondary signal path are connected 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 the 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, Figure 1As shown, in an embodiment of the present application, the two ends of the secondary signal path of the broadband hybrid high roll-off low pass filter unit are connected to the beginning and end of the main signal path, so that when a signal such as a radio frequency signal is input to the input end, the signal will pass through the main signal path and the secondary signal path respectively.

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

[0054] It should be noted that for the signal of the target frequency, the phase difference after passing through the main signal path and the secondary signal path is 180°. At this time, the signal is vector-cancelled after passing through the main signal path and the secondary signal path, so that the transmission of the RF signal forms multiple transmission zeros, achieving the steep roll-off characteristic of the low-pass filter, i.e., high roll-off. In practical applications, by accurately adjusting the position of the series resonant 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 is set in the transition band between the passband and the stopband of the LC low-pass filter 20, so that the RF signal forms 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 passing through the main signal path and the secondary signal path, and a corresponding transmission zero point is generated, so as to achieve the steep roll-off characteristic of the low-pass filter in the transition band.

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

[0056] Figure 3 The unit performance curve diagram of the broadband hybrid high roll-off low pass filter unit provided in the embodiment of the present invention is specifically a performance curve comparison diagram of the broadband hybrid high roll-off low pass filter unit provided in the above embodiment of the present application and the ordinary LC low pass filter, such as Figure 3As shown, the traditional LC filter's passband drops very slowly to the stopband, and the roll-off performance is very poor. However, the broadband hybrid high roll-off 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, so that the broadband hybrid high roll-off low pass filter unit can achieve multiple transmission zeros in the transition band, thereby obtaining extremely high roll-off performance.

[0057] Furthermore, in the present application, the types of acoustic resonators 10 may include multiple types, such as surface wave resonators, thin film bulk acoustic wave resonators, solid-mounted resonators, Lamb wave resonators or transversely excited bulk acoustic wave resonators, which can be flexibly selected according to actual needs.

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

[0059] Specifically, Figure 4 The circuit diagram of the LC low-pass filter in the main signal path of the broadband hybrid high roll-off low-pass filter unit provided in the embodiment of the present invention, first, in the embodiment of the present application, the structure of the LC low-pass filter 20 can be any one of the single inductor type, L-type, T-type and π-type low-pass filter structures, such as Figure 4 21-25, 21-25 shown in the figure are a single inductor low-pass filter structure 21, a π-type low-pass filter structure 22, a T-type low-pass filter structure 23, an L-type low-pass filter variant structure 1 24, and an L-type low-pass filter variant structure 25 respectively; in some other embodiments of the present application, the structure of the LC low-pass filter 20 can also be any combination of single inductor type, L-type, T-type and π-type low-pass filters, that is, a single or multiple cascades of the above structures are formed as shown in FIG. Figure 4 The combined structure 26.

[0060] Further, in the present application, the LC filter 30 mentioned in the above embodiment may 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, a random combination of the same structure as the above-mentioned LC low-pass filter 20 can be used; when the LC filter 30 selects a high-pass filter, its structure can be any one of the L-type, T-type and π-type filter structures, such as Figure 5 31-34, 31-34 are respectively a π-type high-pass filter structure 31, a T-type high-pass filter structure 32, an L-type high-pass filter structure variant 1 33 and an L-type high-pass filter structure variant 2 34, and can also be any combination of the above structures, that is, a single or multiple cascades of the above structures, such as Figure 5 The combined structure in 35.

[0062] Furthermore, in the present application, the LC filter 30 in the broadband hybrid high roll-off low-pass filter unit includes an inorganic material type and an organic material type, wherein the inorganic material type includes a ceramic type and a semiconductor type, and the organic material type includes a PCB type, that is, the types of the LC filter 30 include ceramics, semiconductors, PCB boards (LC filters based on PCB boards) and based on other insulating organic or inorganic materials.

[0063] It should be noted that in the broadband 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 ​​thereof are inversely proportional to the operating frequency.

[0064] On this basis, there are also many combinations of the LC low-pass filter 20 and the LC filter 30, for example: Figure 6-10 As shown, taking the LC filter 30 using the LC low-pass filter specific structure of a single inductor structure as an example, it can be combined with LC low-pass filters 20 of various structures to form a broadband hybrid high-roll-off low-pass filter unit including a main signal path and a secondary signal path.

[0065] in, Figure 6 The LC filter 30 adopts a single inductor low-pass filter structure (same as the inductor low-pass filter structure 21 ), and the LC low-pass filter 20 adopts a combination of a π-type low-pass filter structure 22 ; Figure 7 The LC filter 30 adopts a single inductor low-pass filter structure, and the LC low-pass filter 20 adopts a T-type low-pass filter structure 23; Figure 8 The LC filter 30 adopts a single inductor low-pass filter structure, and the LC low-pass filter 20 adopts a combination of a variant structure 24 of an L-type low-pass filter; Fig. 9 The LC filter 30 adopts a single inductor low-pass filter structure, and the LC low-pass filter 20 adopts a combination of a second variant structure 25 of an L-type low-pass filter; Fig.10 The LC filter 30 adopts a single inductor low-pass filter structure, while the LC low-pass filter 20 adopts a combination of a combination structure 26 .

[0066] It is understandable that the LC filter 30 may also adopt other low-pass filter structures, as well as the high-pass filter structure or band-pass filter structure mentioned above, and the specific selection may be flexibly made according to actual needs.

[0067] Further, in some embodiments of the present application, each broadband hybrid high roll-off low pass filter unit may include multiple secondary signal paths. 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. Fig.11shown.

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

[0069] It should be noted that in some embodiments, the target frequencies corresponding to the multiple secondary signal paths and the main signal path in the same broadband hybrid high-roll-off low-pass filter unit may be the same, that is, the frequency points at which the RF signal forms a phase difference of 180° in the transition band between the passband and the stopband after passing through the main signal path and each secondary signal path are the same.

[0070] In other embodiments of the present application, the target frequencies corresponding to multiple secondary signal paths and the main signal path in the same broadband hybrid high-roll-off low-pass filter unit may be different, that is, the frequency points with a phase difference of 180° formed by the RF signal after passing through the main signal path and each secondary signal path in the transition band between the passband and the stopband are different (but both are located in the transition band of the LC low-pass filter), thereby increasing the frequency points with a phase difference of 180° and improving the effect of suppressing the stopband signal and improving the transition band roll-off.

[0071] The broadband hybrid high roll-off low pass filter unit provided by the present application combines the advantages of the LC filter and the acoustic filter through the combination of the LC filter and the acoustic filter: on the one hand, the broadband hybrid high roll-off low pass filter unit has the large bandwidth of the LC filter, and on the other hand, the broadband 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 disadvantage of low roll-off of the traditional LC filter and the bandwidth limitation of the acoustic filter, 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 broadband hybrid high roll-off low pass filter circuit, such as Fig.12 As shown, the broadband hybrid high roll-off low pass filter circuit includes at least one broadband hybrid high roll-off low pass filter unit as in the above broadband hybrid high roll-off low pass filter unit embodiment, and a plurality of broadband hybrid high roll-off low pass filter units are connected in series, thereby further improving the stop band suppression and the transition band roll-off on the basis of the broadband hybrid high roll-off low pass filter unit.

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

[0075] Figure 13-17 There are various embodiments of the broadband hybrid high roll-off low pass filter circuit of the present application, such as Figure 13-17 As shown, 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 broadband hybrid high roll-off low pass filter unit embodiment, specifically including but not limited to: Fig.13 The LC filter 30 shown in FIG. 1 adopts a single inductor low-pass filter structure, while the LC low-pass filter 20 adopts a combination of a π-type low-pass filter structure 22; Fig.14 The LC filter 30 shown adopts a single inductor low-pass filter structure, while the LC low-pass filter 20 adopts a combination of a T-type low-pass filter structure 23; Fig.15 The LC filter 30 shown adopts a single inductor low-pass filter structure, while the LC low-pass filter 20 adopts a combination of an L-type low-pass filter variant structure 24; Fig.16 The LC filter 30 shown adopts a single inductor low-pass filter structure, while the LC low-pass filter 20 adopts a combination of a second variant structure 25 of an L-type low-pass filter; Fig.17 The illustrated LC filter 30 adopts a single inductor low-pass filter structure, while the LC low-pass filter 20 adopts a combination of a 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 structural types (that is, the structural combinations of the LC filter 30 and the LC low pass filter 20 in multiple broadband hybrid high roll-off low pass filter units are different).

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

[0078] In addition, the number of target frequencies corresponding to multiple broadband hybrid high roll-off low pass filter units in the broadband hybrid high roll-off low pass filter circuit may 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 wave 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), and can be flexibly selected according to actual needs.

[0079] The broadband hybrid high roll-off low pass filter unit provided by the present 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 formed by an acoustic resonator 10 and an LC filter 20 connected in series; and a single secondary signal path can be expanded into multiple secondary signal paths, and the signal phase difference after passing through the main signal path and the secondary signal path is 180°, forming multiple transmission zero points, achieving the purpose of improving the roll-off of the filter transition band, so that the broadband hybrid high roll-off low pass filter unit has a low pass filtering function and has better out-of-band suppression performance. At the same time, multiple broadband hybrid high roll-off low pass filter units can be combined in series to form a broadband hybrid high roll-off low pass filter circuit, which can further improve the out-of-band suppression performance.

[0080] Filter Example:

[0081] Based on the same inventive concept, the present application also provides a broadband hybrid high roll-off low pass filter, in which a broadband hybrid high roll-off low pass filter unit as mentioned in the above filter unit embodiment or a broadband hybrid high roll-off low pass filter circuit as mentioned in the above filter circuit embodiment is provided.

[0082] Communication module embodiment:

[0083] Based on the same inventive concept, the present application also provides a communication module, in which a broadband hybrid high roll-off low pass filter as mentioned in the above filter embodiment is provided.

[0084] Communication device embodiment:

[0085] Based on the same inventive concept, the present application also provides a communication device, in which a communication module as mentioned in the above communication module embodiment is arranged.

[0086] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0087] It should be noted that, in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "plurality" refers to at least two.

[0088] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0089] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0090] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0091] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may 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 this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A broadband hybrid high roll-off low pass filter unit, characterized in that: include: an input terminal, an output terminal, and a primary signal path and a secondary signal path disposed between the input terminal and the output terminal; An LC low-pass filter is provided on the main signal path; An acoustic resonator and an LC filter are provided on the secondary signal path, and the acoustic resonator and the LC filter are connected in series; The main signal path is connected in parallel with the secondary signal path, and the phase difference of signals 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, and the target value includes 180°.

2. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: The target value range is 180°±30°.

3. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: The structure of the LC low-pass filter is any one of single inductor type, L type, T type and π type low-pass filter structures.

4. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: The structure of the LC low-pass filter is a combination of one or more of a single inductor type, an L type, a T type and a π type low-pass filter structure.

5. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: The structure of the LC filter is any one of single inductor type, L type, T type and π type filter structures.

6. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: The structure of the LC filter is a combination of one or more of single inductor type, L type, T type and π type filter structures.

7. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: The LC filter is a low-pass filter, a high-pass filter or a band-pass filter.

8. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: 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.

9. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: The types of acoustic resonators include: surface wave resonators, thin film bulk acoustic wave resonators, solid-mounted resonators, Lamb wave resonators and transversely excited bulk acoustic wave resonators.

10. The broadband hybrid high roll-off low pass filter unit according to claim 1, characterized in that: The number of the secondary signal path is at least one. When there are multiple secondary signal paths, each of the secondary signal paths is connected in parallel with the main signal path, and each of the secondary signal paths is connected in parallel with other secondary signal paths.

11. The broadband hybrid high roll-off low pass filter unit according to claim 10, characterized in that: The target frequencies corresponding to the plurality of secondary signal paths are the same as those corresponding to the primary signal path.

12. The broadband hybrid high roll-off low pass filter unit according to claim 10, characterized in that: The target frequencies corresponding to the plurality of secondary signal paths are different from those corresponding to the primary signal path.

13. A broadband hybrid high roll-off low pass filter circuit, characterized in that: It comprises at least one broadband hybrid high roll-off low pass filter unit as claimed in any one of claims 1 to 12, and when there are a plurality of said broadband hybrid high roll-off low pass filter units, the plurality of said broadband hybrid high roll-off low pass filter units are connected in series.

14. The broadband hybrid high roll-off low pass filter circuit according to claim 13, characterized in that: The target frequencies corresponding to the plurality of broadband hybrid high roll-off low pass filter units are all the same.

15. The broadband hybrid high roll-off low pass filter circuit according to claim 13, characterized in that: The target frequencies corresponding to the plurality of broadband hybrid high roll-off low pass filter units are different.

16. The broadband hybrid high roll-off low pass filter circuit according to claim 13, characterized in that: The number of target frequencies corresponding to the plurality of broadband hybrid high roll-off low pass filter units is the same.

17. The broadband hybrid high roll-off low pass filter circuit according to claim 13, characterized in that: The plurality of broadband hybrid high roll-off low pass filter units correspond to different numbers of target frequencies.

18. A broadband hybrid high roll-off low pass filter, characterized in that: It comprises a broadband hybrid high roll-off low pass filter circuit as described in any one of claims 13 to 17.

19. A communication module, characterized in that: The method comprises the broadband hybrid high roll-off low pass filter as claimed in claim 18.

20. A communication device, characterized in that: Comprising the communication module as claimed in claim 19.

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