Bandpass filter circuit and transmission chain

Abstract

The present disclosure relates to bandpass filter circuits and transmission chains. The present disclosure provides a bandpass filter circuit. An example bandpass filter circuit includes a first high-pass filter, a bandpass filter, and a second high-pass filter in series. The bandpass filter includes a first acoustic resonator and a second acoustic resonator disposed in series between a first node and a second node, two first coils disposed in series with each other and in parallel with the first acoustic resonator, two second coils disposed in series with each other and in parallel with the second acoustic resonator, a third acoustic resonator disposed between a third intermediate node and a fourth node between the first coils, and a fourth acoustic resonator disposed between a fifth intermediate node and the fourth node between the second coils.

Description

[0001] Cross-references to (one or more) related applications

[0002] This application claims priority to French patent application No. FR2406847 entitled “CIRCUIT DE FILTRAGE PASSE-BANDE”, filed on June 26, 2024, which is hereby incorporated by reference to the fullest extent permitted by law. Technical Field

[0003] This specification generally relates to the processing and transmission of periodic signals, such as radio frequency (RF) signals. More specifically, this specification relates to performing filtering operations on RF signals. Background Technology

[0004] Periodic signals, such as radio frequency signals, are commonly used to transmit information. Their processing is crucial for the correct transmission of data.

[0005] Using different types of filters is part of the routine processing applied to periodic signals.

[0006] It is hoped that some features of circuits used for filtering periodic signals can be improved, at least partially. Summary of the Invention

[0007] There is a need for more efficient circuits for filtering periodic signals.

[0008] There is a need for more efficient circuits for filtering radio frequency signals.

[0009] There is a need for more efficient bandpass circuits for filtering radio frequency signals.

[0010] There is a need for bandpass circuits for filtering radio frequency signals, thereby allowing filtering of signals with frequencies contained in a wider frequency band.

[0011] There is a need for filtering methods that have these same advantages.

[0012] There is a need for transmission chains that use this type of filter circuit.

[0013] There is a need for signal transmission methods that have these same advantages.

[0014] One embodiment overcomes some or all of the shortcomings of known filter circuits.

[0015] One embodiment overcomes some or all of the shortcomings of known signal filtering methods.

[0016] One embodiment overcomes some or all of the disadvantages of known transport links.

[0017] One embodiment overcomes some or all of the disadvantages of known transmission methods.

[0018] One embodiment provides a bandpass filter circuit, including a first high-pass filter, a bandpass filter, and a second high-pass filter connected in series, wherein the bandpass filter includes:

[0019] - A first acoustic resonator and a second acoustic resonator are connected in series between the first node and the second node.

[0020] - At least two first coils connected in series with each other and connected in parallel with the first acoustic resonator;

[0021] - At least two second coils connected in series with each other and connected in parallel with the second acoustic resonator;

[0022] - At least one third acoustic resonator is disposed between the third intermediate node and the fourth reference node between the first coils; and

[0023] - At least one fourth acoustic resonator is disposed between the fifth intermediate node and the fourth reference node between the second coils.

[0024] According to the embodiment, the first acoustic resonator and the second acoustic resonator are identical to each other, the first coil and the second coil are identical to each other, and the third acoustic resonator and the fourth acoustic resonator are identical to each other.

[0025] According to an embodiment, the first acoustic resonator can include at least two fifth acoustic resonators arranged in series.

[0026] According to an embodiment, the second acoustic resonator can include at least two sixth acoustic resonators arranged in series.

[0027] According to an embodiment, the first high-pass filter includes: two first capacitors connected in series between a sixth node and a first node; and a second capacitor and a third coil connected in series between a seventh intermediate node and a fourth reference node between the first capacitors.

[0028] According to an embodiment, the second high-pass filter includes: two third capacitors connected in series between the second node and the eighth node; and a fourth capacitor and a fourth coil connected in series between the ninth intermediate node and the fourth reference node between the second capacitors.

[0029] According to an embodiment, the first high-pass filter and the second high-pass filter are symmetrical with respect to the band-pass filter.

[0030] According to an embodiment, the filter circuit further includes a fifth coil disposed in series between the sixth node and the fourth reference node.

[0031] According to an embodiment, the filter circuit further includes a sixth coil disposed in series between the seventh node and the fourth reference node.

[0032] Another embodiment provides a method for filtering radio frequency signals using a bandpass filter circuit, the bandpass filter circuit including a first high-pass filter, a bandpass filter, and a second high-pass filter connected in series, wherein the bandpass filter includes:

[0033] - A first acoustic resonator and a second acoustic resonator are connected in series between the first node and the second node.

[0034] - At least two first coils connected in series with each other and connected in parallel with the first acoustic resonator;

[0035] - At least two second coils connected in series with each other and connected in parallel with the second acoustic resonator;

[0036] - At least one third acoustic resonator is disposed between the third intermediate node and the fourth reference node between the first coils; and

[0037] - At least one fourth acoustic resonator is disposed between the fifth intermediate node and the fourth reference node between the second coils.

[0038] According to an embodiment, the first acoustic resonator and the second acoustic resonator are identical to each other, wherein the first coil and the second coil are identical, and the third acoustic resonator and the fourth acoustic resonator are identical to each other.

[0039] According to an embodiment, the first acoustic resonator may include at least two fifth acoustic resonators arranged in series.

[0040] According to an embodiment, the second acoustic resonator may include at least two sixth acoustic resonators arranged in series.

[0041] According to an embodiment, the first high-pass filter includes:

[0042] - Two first capacitors are connected in series between the sixth node and the first node; and

[0043] - A second capacitor and a third coil are connected in series between the seventh intermediate node and the fourth reference node between the first capacitor and the third reference node.

[0044] According to an embodiment, the second high-pass filter includes:

[0045] - Two third capacitors are connected in series between the second and eighth nodes; and

[0046] - A fourth capacitor and a fourth coil are connected in series between the ninth intermediate node and the fourth reference node between the second capacitor and the second capacitor.

[0047] According to an embodiment, the first high-pass filter and the second high-pass filter are symmetrical with respect to the band-pass filter.

[0048] According to an embodiment, the filter circuit further includes a fifth coil disposed in series between the sixth node and the fourth reference node.

[0049] According to an embodiment, the filter circuit further includes a sixth coil disposed in series between the seventh node and the fourth reference node.

[0050] Another embodiment provides a transmission chain that includes the aforementioned filter circuitry.

[0051] Another embodiment provides a method for transmitting signals using the aforementioned filtering method. Attached Figure Description

[0052] The foregoing features and advantages, as well as other features and advantages, will be described in detail below with reference to the accompanying drawings in a description of specific embodiments given in an illustrative rather than limiting manner, wherein:

[0053] Figure 1 The figure illustrates a first embodiment of a bandpass filter circuit;

[0054] Figure 2 Including showing Figure 1 A graph illustrating the operation of the embodiment shown;

[0055] Figure 3 Including showing Figure 1 A graph illustrating the operation of the embodiment shown;

[0056] Figure 4 The diagram illustrates a second embodiment of a bandpass filter circuit;

[0057] Figure 5 Including showing Figure 4 A graph illustrating the operation of the embodiment shown;

[0058] Figure 6 Including showing Figure 4 A graph illustrating the operation of the embodiment shown; and

[0059] Figure 7 The diagram shows... Figure 1 and Figure 4 A top view of an actual implementation of the embodiment shown. Detailed Implementation

[0060] In the various figures, similar features are indicated by similar reference numerals. In particular, common structural and / or functional features in various embodiments may have the same reference numerals and may be provided with the same structure, size, and material properties.

[0061] For clarity, only detailed illustrations and descriptions are provided to aid in understanding the embodiments described herein.

[0062] Unless otherwise indicated, when referring to two elements connected together, it means a direct connection without any intermediate elements other than conductors, and when referring to two elements coupled together, it means that the two elements can be connected or they can be coupled via one or more other elements.

[0063] In the following disclosure, unless otherwise indicated, when absolute positional qualifiers such as “front,” “back,” “top,” “bottom,” “left,” “right,” etc., or relative positional qualifiers such as “up,” “down,” “higher,” “lower,” etc., or orientation qualifiers such as “horizontal,” “vertical,” etc., refer to the orientation shown in the figure.

[0064] Unless otherwise stated, the expressions “about,” “approximately,” “substantially,” and “approximately” indicate within 10%, and preferably within 5%.

[0065] The embodiments described below relate to the filtering of periodic signals, and more particularly, to radio frequency signals, i.e., signals with a frequency range from 3 Hz to 300 GHz. More precisely, the embodiments described below are bandpass filter circuits whose isolation and suppression characteristics have been improved for use in communications applications employing wireless communication protocol sets such as Wi-Fi. To this end, these filter circuits are designed to allow signals with a frequency range from 6 GHz to 7.2 GHz (more particularly from 6.105 GHz to 7.125 GHz) to pass through, while suppressing signals with a frequency of approximately 5 GHz. These embodiments will be combined with... Figures 1 to 7 A detailed description is provided. These embodiments are particularly suitable for information and / or data transport chains.

[0066] Furthermore, the embodiments described below are particularly suitable for any type of industrial market where filtering periodic signals is useful. More specifically, this bandpass filter circuit can be designed for:

[0067] - The automotive industry, such as vehicle electrification and vehicle telematics, or the advanced driver assistance systems (ADAS) sector;

[0068] - Industrial sectors, such as green energy, infrastructure electrification, and the Internet of Things (IoT).

[0069] In the field of smart homes, electricity and energy consumption, as well as data exchange, are key elements;

[0070] - The personal electronics industry, such as mobile phones and the Internet of Things (IoT) sector, as well as the high-speed interface sector; and

[0071] - Industries related to communications equipment, computers and peripherals, such as infrastructure and data centers, as well as low Earth orbit (LEO) satellites.

[0072] Figure 1 An electrical diagram of a first embodiment of a bandpass filter circuit 100 is shown.

[0073] Circuit 100 includes an input node IN100 and an output node OUT100. Input node IN100 is adapted to receive a periodic signal intended to be filtered. Output node OUT100 is adapted to provide the filtered periodic signal. Circuit 100 is also referenced to a reference node GND1100 (such as ground) that receives a reference potential.

[0074] Optionally, circuit 100 also includes a first coil L101 for electrostatic discharge protection. The first terminal of coil L101 is coupled (preferably connected) to input node IN100, and the second terminal of coil L101 is coupled (preferably connected) to reference node GND100.

[0075] Optionally, circuit 100 further includes a second coil L102 for electrostatic discharge protection. The first terminal of coil L102 is coupled (preferably connected) to output node OUT100, and the second terminal of coil L102 is coupled (preferably connected) to reference node GND100.

[0076] According to an embodiment, circuit 100 further includes a first high-pass filter HPF110, which includes an input node coupled (preferably connected) to input node IN100 and an output node N102. According to one example, filter HPF110 includes three capacitors CHPF111, CHPF112, and CHPF113, and a coil LHPF111.

[0077] According to one example, capacitors CHPF111 and CHPF112 are connected in series between nodes IN100 and N102. More specifically, the first terminal of capacitor CHPF111 is coupled (preferably connected) to node IN100, and the second terminal of capacitor CHPF111 is coupled (preferably connected) to node N101. The first terminal of capacitor CHPF112 is coupled (preferably connected) to node N101, and the second terminal of capacitor CHPF112 is coupled (preferably connected) to node N102.

[0078] According to one example, capacitor CHPF113 and coil LHPF111 are connected in series between nodes N101 and GND100. More specifically, the first terminal of capacitor CHPF113 is coupled (preferably connected) to node N101, and the second terminal of capacitor CHPF113 is coupled (preferably connected) to the first terminal of coil LHPF111. The second terminal of coil LHPF111 is coupled (preferably connected) to node GND100.

[0079] The HPF110 filter described herein is a first-order high-pass filter. Alternatively, the HPF110 filter could be a higher-order high-pass filter.

[0080] According to one embodiment, the circuit further includes a bandpass filter BPF100, which includes an input node coupled (preferably connected) to the output node N102 of the high-pass filter HPF110, and an output node N103. According to one example, the filter BPF110 includes four acoustic resonators AWR101, AWR102, AWR103, and AWR104, and four coils LBPF101, LBPF102, LBPF103, and LBPF104. The acoustic resonator referred to herein is a mechanical and electronic component, such as a piezoelectric material that resonates between two conductive plates (such as metal plates).

[0081] According to one embodiment, resonators AWR101 and AWR102 are connected in series between nodes N102 and N103. More specifically, the first terminal of resonator AWR101 is coupled (preferably connected) to node N102, and the second terminal of resonator AWR101 is coupled (preferably connected) to node N104. The first terminal of resonator AWR102 is coupled (preferably connected) to node N104, and the second terminal of resonator AWR102 is coupled (preferably connected) to node N103.

[0082] According to an alternative embodiment, each resonator AWR101 and AWR102 can be replaced by a series assembly of at least two acoustic resonators. This can advantageously reduce the total capacitance of the filter circuit 100. Furthermore, this can have the advantage of increasing the surface area of ​​the acoustic resonators while maintaining the total capacitance value of the circuit for ease of manufacture and better power handling.

[0083] According to one embodiment, coils LBPF101 and LBPF102 are connected in series between nodes N102 and N104. In other words, coils LBPF101 and LBPF102 are connected in series with each other and in parallel with the acoustic resonator AWR101. More specifically, the first terminal of coil LBPF101 is coupled (preferably connected) to node N102, and the second terminal of coil LBPF101 is coupled (preferably connected) to node N105. The first terminal of coil LBPF102 is coupled (preferably connected) to node N105, and the second terminal of coil LBPF102 is coupled (preferably connected) to node N104.

[0084] According to one embodiment, coils LBPF103 and LBPF104 are connected in series between nodes N104 and N103. In other words, coils LBPF103 and LBPF104 are connected in series with each other and in parallel with the acoustic resonator AWR102. More specifically, the first terminal of coil LBPF103 is coupled (preferably connected) to node N104, and the second terminal of coil LBPF103 is coupled (preferably connected) to node N106. The first terminal of coil LBPF104 is coupled (preferably connected) to node N106, and the second terminal of coil LBPF104 is coupled (preferably connected) to node N103.

[0085] According to one embodiment, resonator AWR103 couples node N105 to reference node GND100. In other words, the first terminal of resonator AWR103 is coupled (preferably connected) to node N105, and the second terminal of resonator AWR103 is coupled (preferably connected) to node GND100.

[0086] According to one embodiment, resonator AWR104 couples node N106 to reference node GND100. In other words, the first terminal of resonator AWR104 is coupled (preferably connected) to node N106, and the second terminal of resonator AWR104 is coupled (preferably connected) to node GND100.

[0087] According to an alternative embodiment, each resonator AWR103 and AWR104 can be replaced by a series assembly of at least two acoustic resonators. This can advantageously reduce the total capacitance of the filter circuit 100. Furthermore, this can have the advantage of increasing the surface area of ​​the acoustic resonators while maintaining the total capacitance value of the circuit for ease of manufacture and better power handling.

[0088] According to one embodiment, the circuit further includes a second high-pass filter HPF120, which includes an input node coupled (preferably connected) to the output node N103 of the bandpass filter BPF100, and an output node coupled (preferably connected) to the output node OUT100. According to one example, the filter HPF120 includes three capacitors CHPF121, CHPF122, and CHPF123, and a coil LHPF121.

[0089] According to one example, capacitors CHPF121 and CHPF122 are connected in series between nodes N103 and OUT100. More specifically, the first terminal of capacitor CHPF121 is coupled (preferably connected) to node N103, and the second terminal of capacitor CHPF121 is coupled (preferably connected) to node N107. The first terminal of capacitor CHPF122 is coupled (preferably connected) to node N107, and the second terminal of capacitor CHPF122 is coupled (preferably connected) to node OUT100.

[0090] According to one example, capacitor CHPF121 and coil LHPF121 are connected in series between nodes N107 and GND100. More specifically, the first terminal of capacitor CHPF123 is coupled (preferably connected) to node N107, and the second terminal of capacitor CHPF123 is coupled (preferably connected) to the first terminal of coil LHPF121. The second terminal of coil LHPF121 is coupled (preferably connected) to node GND100.

[0091] The HPF120 filter described herein is a first-order high-pass filter. According to alternative embodiments, the HPF120 filter can be a higher-order high-pass filter.

[0092] According to a specific example of the invention, the components of the filter circuit 100 may have the following values. It should be noted that other values ​​are conceivable, and the determination of these values ​​is within the capabilities of those skilled in the art.

[0093] In the HPF110 high-pass filter:

[0094] - The CHPF111 capacitor has a capacitance between 0.1 and 5 pF, for example, about 0.53 pF;

[0095] - The CHPF112 capacitor has a capacitance between 0.1 and 5 pF, for example, about 0.61 pF;

[0096] - The CHPF113 capacitor has a capacitance between 0.1 and 5 pF, for example, approximately 1.53 pF; and

[0097] The LHPF111 coil has an inductance between 0.1 and 5 nH, for example, about 1.51 nH.

[0098] In the BPF100 bandpass filter:

[0099] - The LHPF101 coil has an inductance between 0.1 and 5 nH, for example, about 1.61 nH;

[0100] - The LHPF102 coil has an inductance between 0.1 and 5 nH, for example, about 1 nH;

[0101] - The LHPF103 coil has an inductance between 0.1 and 5 nH, for example, about 1.4 nH;

[0102] - The LHPF104 coil has an inductance between 0.1 and 5 nH, for example, about 0.93 nH;

[0103] The AWR101 acoustic resonator has a capacitance between 0.1 and 5 pF, for example, approximately 0.524 pF.

[0104] The capacitor has a pF capacitance, a resonant frequency between 5 and 10 GHz, for example, about 6.51 GHz, and an anti-resonant frequency between 5 and 10 GHz, for example, about 7.02 GHz;

[0105] - The acoustic resonator AWR102 has a capacitance between 0.1 and 5 pF, for example, about 0.314 pF, a resonant frequency between 5 and 10 GHz, for example, about 6.46 GHz, and an anti-resonant frequency between 5 and 10 GHz, for example, about 6.98 GHz.

[0106] The AWR103 acoustic resonator has a capacitance between 0.1 and 5 pF, for example, approximately 0.206 pF; a resonant frequency between 5 and 10 GHz, for example, approximately 6.09 GHz; and an anti-resonant frequency between 5 and 10 GHz, for example, approximately 6.57 GHz.

[0107] The AWR104 acoustic resonator has a capacitance between 0.1 and 5 pF, for example, about 0.200 pF, a resonant frequency between 5 and 10 GHz, for example, about 6.10 GHz, and an anti-resonant frequency between 5 and 10 GHz, for example, about 6.57 GHz.

[0108] In the HPF120 high-pass filter:

[0109] - The CHPF121 capacitor has a capacitance between 0.1 and 5 pF, for example, about 1.86 pF;

[0110] - The CHPF122 capacitor has a capacitance between 0.1 and 5 pF, for example, about 1.75 pF;

[0111] - The CHPF123 capacitor has a capacitance between 0.1 and 5 pF, for example, approximately 1 pF; and

[0112] The LHPF121 coil has an inductance between 0.1 and 5 nH, for example, about 1.76 nH.

[0113] The operation of bandpass filter circuit 100 is about Figure 2 and Figure 3 Provide a detailed description.

[0114] The method of filtering periodic signals (such as radio frequency signals) using a filter circuit of the type 100 described herein is also within the scope of this disclosure.

[0115] Furthermore, the bandpass filter circuit 100 can be used within a transmission chain for transmitting information and / or data. Methods for transmitting information and / or data using such a transmission chain are also within the scope of this disclosure.

[0116] Figure 2 Includes three graphs (A), (B), and (C), which show about Figure 1 The operation of the three filters contained in the described filter circuit 100.

[0117] More specifically, graph (A) illustrates the operation of the high-pass filter HPF110. Graph (B) illustrates the operation of the band-pass filter BPF100. Graph (C) illustrates the operation of the high-pass filter HPF120.

[0118] Each of the graphs (A), (B), and (C) consists of two curves illustrating the filter's performance in terms of matching and attenuation depending on the frequency of the signal received by the filter. More specifically, the first curve represents the filter's adaptability, that is, the ratio of reflected power to incident power (in decibels), also known as return loss. The second curve represents the filter's attenuation, that is, the relative reduction in signal power during transmission, which can be expressed as the ratio between input signal power and output signal power (measured in decibels).

[0119] Specifically, graph (A) includes curve 201 illustrating the matching of the high-pass filter HPF110, and curve 202 illustrating the attenuation of the high-pass filter HPF110. For this simulation, an input signal applied at node IN100 and an output signal provided by node N102 are considered. Curves 201 and 202 show that the HPF110 filter suppresses any signals below 5 GHz and has low insertion loss for signals above 5 GHz.

[0120] Graph (B) includes curve 203 illustrating the matching of bandpass filter BPF100, and curve 204 illustrating the matching of bandpass filter BPF100. For this simulation, an input signal applied at node N102 and an output signal provided by node N103 are considered. Curves 203 and 204 show that filter BPF100 allows any signal with a frequency between approximately 6 GHz and 7.5 GHz to pass through, and has attenuation for signals with frequencies ranging from approximately 3 GHz to 6 GHz and above 7 GHz.

[0121] Graph (C) includes curve 205 illustrating the attenuation of the bandpass filter HPF120, and curve 208 illustrating the matching of the high-pass filter HPF120. For this simulation, an input signal applied at node N103 and an output signal provided by node OUT100 were considered. Curves 205 and 206 show that the HPF120 filter suppresses any signal with frequencies below approximately 4 GHz and has low insertion loss for signals with frequencies above 4 GHz.

[0122] Figure 3 The diagram is about Figure 1 A graph depicting the operation of the described circuit 100.

[0123] More specifically, Figure 3 The graph shown illustrates the operation of filter circuit 100 (i.e., a combination of filters HPF110, BPF100, and HPF120, which have been described previously).

[0124] As shown in graphs (A), (B), and (C), Figure 3 The graph shown therefore comprises two curves illustrating the filter's performance in terms of matching and attenuation depending on the frequency of the signal received by the filter. Specifically, the first curve represents the filter's adaptability, that is, the ratio of reflected power to incident power (in decibels), also known as return loss. The second curve represents the filter's attenuation, that is, the relative reduction in signal power during transmission, which can be expressed as the ratio between input signal power and output signal power (measured in decibels).

[0125] therefore, Figure 3 The graphs shown include curve 301 illustrating the attenuation of the bandpass filter circuit 100, and curve 302 illustrating the matching of the bandpass filter circuit 100. For this simulation, an input signal applied at node IN100 and an output signal provided by node OUT100 are considered. Curves 301 and 302 show that the filter circuit 100 suppresses any signals with frequencies below 6 GHz and frequencies above approximately 7.2 GHz.

[0126] Figure 1 One advantage of the filter circuit 100 shown is that it allows for attenuation or suppression of less than -40 dB, approximately -49 dB, for signals with a frequency of approximately 5.895 GHz.

[0127] Figure 4 An electrical diagram of a first embodiment of a bandpass filter circuit 400 is shown.

[0128] Bandpass filter circuit 400 and about Figure 1 The bandpass filter circuit 100 described is similar. The common features of circuits 100 and 400 will not be described in detail here. Only the differences between circuits 100 and 400 will be highlighted.

[0129] The bandpass filter circuit 400 includes the same components as the bandpass filter circuit 100, but also has symmetry in the characteristics of these components. More specifically, node N104 forms the axis of symmetry of circuit 400.

[0130] In particular, the following components are identical in pairs:

[0131] - Capacitor CHPF111 for filter HPF110 and capacitor CHPF122 for filter HPF120;

[0132] - Capacitor CHPF112 for filter HPF110 and capacitor CHPF121 for filter HPF120;

[0133] - Capacitor CHPF113 for filter HPF110 and capacitor CHPF123 for filter HPF120;

[0134] - The coil LHPF111 of filter HPF110 and the coil LHPF121 of filter HPF120;

[0135] - Resonators AWR101 and AWR102 of filter BPF100;

[0136] - The coils LBPF101 and LBPF104 of filter BPF100;

[0137] - The coils LBPF102 and LBPF103 of the filter BPF100; and

[0138] - Resonators AWR103 and AWR104 of filter BPF100.

[0139] According to a practical example of this disclosure, the components of the filter circuit 400 may have the following values. It should be noted that other values ​​are conceivable, and the determination of these values ​​is within the capabilities of those skilled in the art.

[0140] In the HPF410 high-pass filter:

[0141] - The CHPF111 capacitor has a capacitance between 0.1 and 5 pF, for example, about 0.86 pF;

[0142] - The CHPF112 capacitor has a capacitance between 0.1 and 5 pF, for example, about 0.96 pF;

[0143] - The CHPF113 capacitor has a capacitance between 0.1 and 5 pF, for example, approximately 0.84 pF; and

[0144] The LHPF111 coil has an inductance between 0.1 and 5 nH, for example, about 1.57 nH.

[0145] In the BPF400 bandpass filter:

[0146] - The LHPF101 coil has an inductance between 0.1 and 5 nH, for example, about 0.74 nH;

[0147] - The LHPF102 coil has an inductance between 0.1 and 5 nH, for example, about 0.74 nH;

[0148] - The LHPF103 coil has an inductance between 0.1 and 5 nH, for example, about 0.51 nH;

[0149] - The LHPF104 coil has an inductance between 0.1 and 5 nH, for example, about 0.51 nH;

[0150] The AWR101 acoustic resonator has a capacitance between 0.1 and 5 pF, for example, approximately 0.587 pF.

[0151] The capacitor has a pF capacitance, a resonant frequency between 5 and 10 GHz, for example, about 6.51 GHz, and an anti-resonant frequency between 5 and 10 GHz, for example, about 7.03 GHz;

[0152] - The acoustic resonator AWR102 has a capacitance between 0.1 and 5 pF, for example, about 0.264 pF, a resonant frequency between 5 and 10 GHz, for example, about 6.01 GHz, and an anti-resonant frequency between 5 and 10 GHz, for example, about 6.51 GHz.

[0153] The AWR103 acoustic resonator has a capacitance between 0.1 and 5 pF, for example, approximately 0.206 pF; a resonant frequency between 5 and 10 GHz, for example, approximately 6.09 GHz; and an anti-resonant frequency between 5 and 10 GHz, for example, approximately 6.57 GHz.

[0154] The AWR104 acoustic resonator has a capacitance between 0.1 and 5 pF, for example, about 0.200 pF, a resonant frequency between 5 and 10 GHz, for example, about 6.10 GHz, and an anti-resonant frequency between 5 and 10 GHz, for example, about 6.57 GHz.

[0155] In the HPF420 high-pass filter:

[0156] - The CHPF121 capacitor has a capacitance between 0.1 and 5 pF, for example, about 0.86 pF;

[0157] - The CHPF122 capacitor has a capacitance between 0.1 and 5 pF, for example, about 0.93 pF;

[0158] - The CHPF123 capacitor has a capacitance between 0.1 and 5 pF, for example, approximately 0.84 pF; and

[0159] The LHPF121 coil has an inductance between 0.1 and 5 nH, for example, about 1.57 nH.

[0160] Figure 5 Includes three graphs (A), (B), and (C), which illustrate the relationship between... Figure 4 The operation of the three filters contained in the described filter circuit 400.

[0161] More specifically, graph (A) illustrates the operation of the high-pass filter HPF400. Graph (B) illustrates the operation of the band-pass filter BPF400. Graph (C) illustrates the operation of the high-pass filter HPF420.

[0162] Such as about Figure 2Each of the graphs (A), (B), and (C) comprises two curves illustrating the filter's performance in terms of matching and attenuation depending on the frequency of the signal received by the filter. More specifically, the first curve represents the filter's adaptability, that is, the ratio of reflected power to incident power (in decibels), also known as return loss. The second curve represents the filter's attenuation, that is, the relative reduction in signal power during transmission, which can be expressed as the ratio between input signal power and output signal power (measured in decibels).

[0163] Specifically, graph (A) includes curve 501 illustrating the matching of the HPF410 high-pass filter, and curve 502 illustrating the attenuation of the HPF410 high-pass filter. For this simulation, an input signal applied at node IN100 and an output signal provided by node N102 are considered. Curves 501 and 502 show that the HPF410 filter suppresses any signal with frequencies below 5 GHz and has low insertion loss for signals with frequencies above 5 GHz.

[0164] Graph (B) includes curve 503, illustrating the matching of the bandpass filter BPF400, and curve 504, illustrating the matching of the bandpass filter BPF400. For this simulation, an input signal applied at node N102 and an output signal provided by node N103 were considered. Curves 503 and 504 show that the HPF400 filter allows any signal with frequencies below 4.5 GHz and a frequency range from approximately 6 GHz to 7.5 GHz to pass through, and has attenuation or suppression for signals with frequencies from approximately 4.5 GHz to 6 GHz and above 8 GHz.

[0165] Graph (C) includes curve 505 illustrating the attenuation of the HPF420 high-pass filter, and curve 506 illustrating the matching of the HPF420 high-pass filter. For this simulation, an input signal applied at node N103 and an output signal provided by node OUT100 were considered. Curves 505 and 506 show that the HPF420 filter suppresses any signal with frequencies below approximately 5 GHz and has low insertion loss for signals with frequencies above 5 GHz.

[0166] Figure 6 The diagram is about Figure 4 A graph depicting the operation of circuit 400.

[0167] More specifically, Figure 6 The graph shown illustrates the operation of filter circuit 400 (i.e., a combination of filters HPF410, BPF400, and HPF420, which have been described previously).

[0168] Similar to the line graphs (A), (B), and (C), Figure 5 The graph shown thus comprises two curves illustrating the filter's performance in terms of matching and attenuation depending on the frequency of the signal received by the filter. More specifically, the first curve represents the filter's adaptability, that is, the ratio of reflected power to incident power (in decibels), also known as return loss. The second curve represents the filter's attenuation, that is, the relative reduction in signal power during transmission, which can be expressed as the ratio between input signal power and output signal power (measured in decibels).

[0169] therefore, Figure 6 The graphs shown include curve 601 illustrating the attenuation of the bandpass filter circuit 400, and curve 602 illustrating the matching of the bandpass filter circuit 400. For this simulation, an input signal applied at node IN100 and an output signal provided by node OUT100 are considered. Curves 601 and 602 show that the filter circuit 400 suppresses any signals with frequencies below 6 GHz and above approximately 8 GHz.

[0170] Figure 1 One advantage of the filter circuit 100 shown is that it allows a suppression gain of less than -40dB, approximately -38dB, for signals with a frequency of approximately 5.895GHz.

[0171] Figure 7 The diagram is about Figure 1 and Figure 4 A top view of a practical embodiment of a circuit 700 of the type described in the bandpass filter circuits 100 and 400.

[0172] Figure 7 The diagram illustrates the positions of different components in bandpass filter circuits 100 and 400, and more specifically, the positions of high-pass filter HPF110, bandpass filter BP100, and high-pass filter HPF120.

[0173] Various embodiments and variations have been described. Those skilled in the art will understand that certain features of these embodiments can be combined, and other variations will readily occur to them.

[0174] Finally, based on the functional descriptions provided above, the actual implementation of the embodiments and variations described herein is within the capabilities of those skilled in the art.

Claims

1. A bandpass filter circuit, characterized by, The bandpass filter circuit includes a first high-pass filter, a bandpass filter, and a second high-pass filter connected in series, wherein the bandpass filter includes: A first acoustic resonator and a second acoustic resonator are connected in series between the first node and the second node. At least two first coils are connected in series with each other and in parallel with the first acoustic resonator; At least two second coils are connected in series with each other and in parallel with the second acoustic resonator; At least one third acoustic resonator is disposed between the third intermediate node and the fourth reference node between the first coils; and At least one fourth acoustic resonator is disposed between the fifth intermediate node and the fourth reference node between the second coils.

2. The bandpass filter circuit of claim 1, wherein, The first and second acoustic resonators are identical to each other. The first and second coils are identical, and the third and fourth acoustic resonators are identical to each other.

3. The bandpass filter circuit of claim 1, wherein, The first acoustic resonator can include at least two fifth acoustic resonators arranged in series.

4. The bandpass filter circuit of claim 1, wherein, The second acoustic resonator can include at least two sixth acoustic resonators arranged in series.

5. The bandpass filter circuit of claim 1, wherein, The first high-pass filter includes: Two first capacitors are connected in series between the sixth node and the first node; and A second capacitor and a third coil are connected in series between the seventh intermediate node and the fourth reference node between the first capacitor.

6. The bandpass filter circuit of claim 1, wherein, The second high-pass filter includes: Two third capacitors are connected in series between the second and eighth nodes; and A fourth capacitor and a fourth coil are connected in series between the ninth intermediate node and the fourth reference node between the second capacitor and the second capacitor.

7. The bandpass filter circuit of claim 1, wherein, The first and second high-pass filters are symmetrical with respect to the band-pass filter.

8. The bandpass filter circuit of claim 5, wherein, The filter circuit further includes a fifth coil connected in series between the sixth node and the fourth reference node.

9. The bandpass filter circuit of claim 5, wherein, The filter circuit further includes a sixth coil connected in series between the seventh node and the fourth reference node.

10. A transmission chain, characterized in that The transmission chain includes the filter circuit as described in claim 1.

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