Filter, integrated passive device, electronic device and display device

Abstract

The embodiment of the invention provides a filter, an integrated passive device, an electronic device and a display device. The filter comprises a first port, a second port, a first band-pass filter circuit, a second band-pass filter circuit and a third band-pass filter circuit, the first band-pass filter circuit is configured to suppress a signal with a frequency between a first frequency and a second frequency in initial signals input by the first port and then output a first signal; the second band-pass filter circuit is configured to receive the first signal and output a second signal of which the frequency is between a third frequency and a fourth frequency in the first signal; the third band-pass filter circuit is configured to receive the second signal and output a third signal of which the frequency is between the fifth frequency and the sixth frequency in the second signal to the second port; wherein the first frequency is smaller than the second frequency; the third frequency is between the first frequency and the second frequency; the fifth frequency is between the third frequency and the second frequency.

Description

Filters, integrated passive components, electronic devices and display devices Technical Field

[0001] The present disclosure relates to the field of electronic technology, and in particular to filters, integrated passive devices, electronic devices and display devices. Background Art

[0002] As an essential component in communication systems, filters have a wide range of applications.

[0003] Traditional filters come in many different types, including LC filters and cavity filters. Cavity filters are larger and are generally used in areas such as base stations. LC filters have a low degree of integration, are typically large in size, and are primarily used in low-frequency applications, resulting in poor filtering characteristics for high-frequency signals.

[0004] Summary of the Invention

[0005] The filter provided by the embodiment of the present disclosure includes: a first port, a second port, a first band-pass filtering circuit, a second band-pass filtering circuit, and a third band-pass filtering circuit;

[0006] The first bandpass filter circuit is connected to the first port and is configured to suppress a signal with a frequency between the first frequency and the second frequency in the initial signal input to the first port and then output a first signal;

[0007] The second band-pass filter circuit is coupled to the first band-pass filter circuit and is configured to receive the first signal and output a second signal having a frequency between a third frequency and a fourth frequency in the first signal;

[0008] The third band-pass filter circuit is coupled to the second band-pass filter circuit, and is configured to receive the second signal and output a third signal of the second signal having a frequency between the fifth frequency and the sixth frequency to the second port;

[0009] wherein the first frequency is less than the second frequency;

[0010] The third frequency is between the first frequency and the second frequency;

[0011] The fifth frequency is between the third frequency and the second frequency.

[0012] In some possible implementations, the sixth frequency is greater than the second frequency, and the fourth frequency is greater than the sixth frequency.

[0013] In some possible implementations, the first bandpass filter circuit includes: a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor, and a ground terminal;

[0014] A first electrode of the first capacitor is connected to the first port, and a second electrode of the first capacitor is connected to the second band-pass filter circuit;

[0015] A first electrode of the first inductor is connected to a first electrode of the first capacitor, and a second electrode of the first inductor is connected to a second electrode of the first capacitor;

[0016] The first electrode of the second capacitor is connected to the first electrode of the first capacitor, and the second electrode of the second capacitor is connected to the first electrode of the second inductor;

[0017] The second electrode of the second inductor is connected to the ground terminal;

[0018] A first electrode of the third capacitor is connected to a first electrode of the second inductor, and a second electrode of the third capacitor is connected to a second electrode of the second inductor.

[0019] In some possible implementations, the first capacitor is a strip capacitor.

[0020] In some possible implementations, the second band-pass filter circuit includes: a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third inductor, a fourth inductor, and a ground terminal;

[0021] A first electrode of the fourth capacitor is connected to the first band-pass filter circuit, and a second electrode of the fourth capacitor is connected to the first electrode of the fifth capacitor;

[0022] The second electrode of the fifth capacitor is connected to the third band-pass filter circuit;

[0023] The first electrode of the sixth capacitor is connected to the first electrode of the fourth capacitor, and the second electrode of the sixth capacitor is connected to the ground terminal;

[0024] The first electrode of the third inductor is connected to the first electrode of the sixth capacitor, and the second electrode of the third inductor is connected to the second electrode of the sixth capacitor;

[0025] The first electrode of the seventh capacitor is connected to the second electrode of the fifth capacitor, and the second electrode of the seventh capacitor is connected to the ground terminal;

[0026] A first electrode of the fourth inductor is connected to a first electrode of the seventh capacitor, and a second electrode of the fourth inductor is connected to a second electrode of the seventh capacitor.

[0027] In some possible implementations, at least one of the fourth capacitor and the fifth capacitor is a strip-shaped capacitor.

[0028] In some possible implementations, the third band-pass filter circuit includes: an eighth capacitor, a ninth capacitor, a tenth capacitor, a fifth inductor, a sixth inductor, and a ground terminal;

[0029] A first electrode of the eighth capacitor is connected to the second band-pass filter circuit, and a second electrode of the eighth capacitor is connected to the second port;

[0030] The first electrode of the fifth inductor is connected to the first electrode of the eighth capacitor, and the second electrode of the fifth inductor is connected to the second electrode of the eighth capacitor;

[0031] The first electrode of the ninth capacitor is connected to the second electrode of the eighth capacitor, and the second electrode of the ninth capacitor is connected to the first electrode of the sixth inductor;

[0032] The second electrode of the sixth inductor is connected to the ground terminal;

[0033] The first electrode of the tenth capacitor is connected to the first electrode of the sixth inductor, and the second electrode of the tenth capacitor is connected to the second electrode of the tenth capacitor.

[0034] In some possible implementations, the eighth capacitor is a strip-shaped capacitor.

[0035] In some possible implementations, the connection between the capacitor and the inductor in the filter is a short and thick connection.

[0036] In some possible implementations, the capacitance values ​​of the capacitors in the filter are the same.

[0037] In some possible implementations, the capacitance value of the capacitor in the filter ranges from 0.1 pF to 10 pF.

[0038] In some possible implementations, the inductors in the filter have the same inductance value.

[0039] In some possible implementations, the inductance value of the inductor in the filter ranges from 0.1 to 10 nH.

[0040] In some possible implementations, the filter is formed on a glass substrate.

[0041] In some possible implementations, the filter is a high-frequency filter.

[0042] The integrated passive device provided by the embodiment of the present disclosure includes the above-mentioned filter.

[0043] The electronic device provided by the embodiment of the present disclosure includes the above-mentioned integrated passive device.

[0044] The display device provided by the embodiment of the present disclosure includes the above-mentioned electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] FIG1 is a schematic diagram of some structures of filters provided by an embodiment of the present disclosure;

[0046] FIG2 is a schematic diagram of another structure of a filter provided by an embodiment of the present disclosure;

[0047] FIG3 is a graph showing some curves provided by an embodiment of the present disclosure;

[0048] FIG4 is another graph provided by an embodiment of the present disclosure;

[0049] FIG5 is a graph showing some other curves provided by an embodiment of the present disclosure;

[0050] FIG6 is a graph showing some other curves provided by an embodiment of the present disclosure;

[0051] FIG7 is a graph showing some other curves provided by an embodiment of the present disclosure;

[0052] FIG8 is a graph showing some other curves provided by an embodiment of the present disclosure;

[0053] FIG9 is a graph showing some other curves provided by an embodiment of the present disclosure;

[0054] FIG10 is a graph showing some other curves provided by an embodiment of the present disclosure;

[0055] FIG11 is a schematic diagram of some further structures of filters provided by embodiments of the present disclosure;

[0056] FIG12 is a schematic diagram of some further structures of filters provided by an embodiment of the present disclosure;

[0057] FIG13 is a schematic diagram of some further structures of the filter provided by the embodiment of the present disclosure. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. And in the absence of conflict, the embodiments in the present disclosure and the features in the embodiments can be combined with each other. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0059] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0060] It should be noted that the sizes and shapes of the figures in the accompanying drawings do not reflect the actual scale and are only for the purpose of illustrating the present invention. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions.

[0061] With the nation's advancement in aerospace, defense, satellite remote sensing, and radar communications, communications technology has rapidly developed, placing increasingly stringent demands on the performance, size, and reliability of microwave and radio frequency devices. Furthermore, the rapid adoption of 5G technology has significantly increased the use of high-speed signals in daily life and industry. Therefore, the development of high-speed signal electronics has become central to the evolution of communications technology.

[0062] Communication systems include many common RF structures, such as filters, baluns, duplexers, and switches. These structures are typically combined with external circuits and discrete capacitors and inductors on a printed circuit board (PCB). These components and circuits occupy a significant portion of the PCB surface, exceeding 50%, significantly hindering the miniaturization of communication systems.

[0063] As an essential and important component in communication systems, filters have a very wide range of applications. There are many different types of traditional filters, including LC filters and cavity filters. Cavity filters are relatively large and are generally used in areas such as base stations. LC filters achieve filtering functions by arranging different numbers of inductors, capacitors, and resistors according to circuit design, and can be used in some small electronic devices. However, LC filters composed of traditional discrete components have a low degree of integration. Common devices are large in size and are mainly used in low-frequency areas, with poor filtering characteristics for high-frequency signals. The technical indicators of filters in use include passband frequency, bandwidth, insertion loss, out-of-band suppression, etc. In the 5G era, the core goal of communication technology development is to have large bandwidth, low loss, and fast out-of-band attenuation.

[0064] Transmission line filters have a simple structure in the microwave range, but this structure is frequency-dependent and often results in a relatively large size. In the RF domain, where frequencies typically reach GHz, the device length is typically reduced to a half-wavelength or quarter-wavelength resonant unit to meet operational requirements. This significantly increases the size of the device and prevents it from meeting the demands of miniaturization. Traditional LC filters, constructed from discrete components, have a low level of integration, a low Q factor, and poor insertion loss, making them incompatible with the wide bandwidth, high roll-off, and high out-of-band rejection required by RF. Furthermore, traditional LC circuits are primarily used in lower frequency bands and are rarely used in high-frequency applications. Simultaneously achieving low in-band insertion loss and high out-of-band rejection is extremely challenging.

[0065] Based on this, the filter provided by this disclosure combines a high-Q inductor with an ultra-thin, small-sized, large capacitor through a bandpass filter circuit, effectively achieving low insertion loss within the passband, rapid attenuation at the band edges, multiple transmission zeros, and excellent out-of-band rejection. Furthermore, the disclosed circuit design can be applied to the field of integrated passive technology, effectively achieving the goals of miniaturization and low cost of filters.

[0066] The filter provided by the embodiment of the present disclosure, as shown in Figure 1, includes: a first port A, a second port B, a first band-pass filter circuit 10, a second band-pass filter circuit 20 and a third band-pass filter circuit 30; wherein the first band-pass filter circuit 10 is connected to the first port A, and is configured to suppress the signal with a frequency between the first frequency and the second frequency in the initial signal input to the first port A and then output the first signal; the second band-pass filter circuit 20 is coupled to the first band-pass filter circuit 10, and is configured to receive the first signal and output the second signal with a frequency between the third frequency and the fourth frequency in the first signal; the third band-pass filter circuit 30 is coupled to the second band-pass filter circuit 20, and is configured to receive the second signal and output the third signal with a frequency between the fifth frequency and the sixth frequency in the second signal to the second port B; wherein the first frequency is less than the second frequency; the third frequency is between the first frequency and the second frequency; and the fifth frequency is between the third frequency and the second frequency.

[0067] In the embodiment of the present disclosure, through the mutual cooperation of the first port, the second port, the first band-pass filter circuit, the second band-pass filter circuit and the third band-pass filter circuit, the transmission zero point is increased, the out-of-band suppression effect is improved, and a filter with multiple transmission zero points, a large bandwidth, a high roll-off characteristic and high out-of-band suppression is formed.

[0068] In the embodiment of the present disclosure, the sixth frequency is greater than the second frequency, and the fourth frequency is greater than the sixth frequency.

[0069] For example, the first frequency is 0.8 GHz, the second frequency is 2.7 GHz, the third frequency is 1 GHz, the fourth frequency is 6 GHz, the fifth frequency is 1.6 GHz, and the sixth frequency is 5.2 GHz. Of course, in specific implementations, the first to sixth frequencies can be determined according to actual application requirements and are not limited here.

[0070] In the embodiment of the present disclosure, as shown in Figure 2, the first band-pass filter circuit 10 includes: a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L1, a second inductor L2 and a ground terminal GND; wherein, the first electrode of the first capacitor C1 is connected to the first port A, and the second electrode of the first capacitor C1 is connected to the second band-pass filter circuit 20; the first electrode of the first inductor L1 is connected to the first electrode of the first capacitor C1, and the second electrode of the first inductor L1 is connected to the second electrode of the first capacitor C1; the first electrode of the second capacitor C2 is connected to the first electrode of the first capacitor C1, and the second electrode of the second capacitor C2 is connected to the first electrode of the second inductor L2; the second electrode of the second inductor L2 is connected to the ground terminal GND; the first electrode of the third capacitor C3 is connected to the first electrode of the second inductor L2, and the second electrode of the third capacitor C3 is connected to the second electrode of the second inductor L2.

[0071] Exemplarily, the first capacitor C1 is a strip-shaped capacitor.

[0072] Among them, through the mutual cooperation of the first capacitor C1, the second capacitor C2, the third capacitor C3, the first inductor L1 and the second inductor L2, the initial signal with a frequency between the first frequency and the second frequency in the initial signal input by the first port A is filtered, and the initial signal with a frequency outside the first frequency and the second frequency is retained, and the retained initial signal is input into the second band-pass filter circuit 20 as the first signal.

[0073] Among them, the first bandpass filter circuit 10 mainly plays the role of suppressing low-frequency out-band. By using relatively few components, two transmission zero points are formed outside the low-frequency band, and the position of the transmission zero point can also be adjusted by fine-tuning the inductor and capacitor for frequency, which plays a good role in suppressing low-frequency out-band.

[0074] For example, as shown in FIG3 , where the horizontal axis represents frequency and the vertical axis represents loss, FIG3 shows that the first bandpass filter circuit 10 not only produces a passband characteristic around 3 GHz, but also produces transmission zeros around 1.1 GHz and 2.6 GHz, effectively blocking the passage of signals near these two frequencies and achieving out-of-band low-frequency suppression. However, the circuit structure does not have a significant suppressive effect at out-of-band high frequencies. Furthermore, FIG3 shows that the first bandpass filter circuit 10 can produce additional transmission zeros within the out-of-band low-frequency range. These transmission zeros can effectively suppress transmission loss in the low-frequency portion outside the passband, thereby improving suppression.

[0075] Exemplarily, the second capacitor C2, the second inductor L2, and the third capacitor C3 are mainly generated at a transmission zero point of 1.1 GHz, and their impedance curves are shown in FIG4 , where the abscissa is frequency and the ordinate is amplitude.

[0076] Exemplarily, the first capacitor C1 and the first inductor L1 are mainly generated at a transmission zero point of 2.6 GHz, and the impedance curve thereof is shown in FIG5 , where the abscissa is the frequency and the ordinate is the amplitude.

[0077] Exemplarily, the inductor in the first bandpass filter circuit 10 can be implemented by a 3D glass-based, high-resistance silicon-based or ceramic-based winding inductor, or by a 2D winding inductor formed of a resin material, which is not limited here.

[0078] For example, the capacitor in the first bandpass filter circuit 10 can be implemented by an ultra-thin two-layer capacitor structure, or by a multi-layer thickened capacitor structure, which is not limited here.

[0079] The sizes of the inductor and capacitor in the first bandpass filter circuit 10 can be designed according to the device size, so that the size of the device can be reduced to the millimeter level, which is much smaller than the common centimeter level device.

[0080] In the embodiment of the present disclosure, as shown in Figure 2, the second band-pass filter circuit 20 includes: a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a third inductor L3, a fourth inductor L4 and a ground terminal GND; wherein, the first electrode of the fourth capacitor C4 is connected to the first band-pass filter circuit 10, and the second electrode of the fourth capacitor C4 is connected to the first electrode of the fifth capacitor; the second electrode of the fifth capacitor C5 is connected to the third band-pass filter circuit 30; the first electrode of the sixth capacitor C6 is connected to the first electrode of the fourth capacitor C4, and the second electrode of the sixth capacitor C6 is connected to the ground terminal GND; the first electrode of the third inductor L3 is connected to the first electrode of the sixth capacitor C6, and the second electrode of the third inductor L3 is connected to the second electrode of the sixth capacitor C6; the first electrode of the seventh capacitor C7 is connected to the second electrode of the fifth capacitor C5, and the second electrode of the seventh capacitor C7 is connected to the ground terminal GND; the first electrode of the fourth inductor L4 is connected to the first electrode of the seventh capacitor C7, and the second electrode of the fourth inductor L4 is connected to the second electrode of the seventh capacitor C7.

[0081] The first electrode of the fourth capacitor C4 in the second band-pass filter circuit 20 is connected to the second electrode of the first capacitor C1 in the first band-pass filter circuit 10 .

[0082] Exemplarily, at least one of the fourth capacitor C4 and the fifth capacitor C5 is a strip-shaped capacitor.

[0083] Among them, through the mutual cooperation of the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the third inductor L3 and the fourth inductor L4, the first signal with a frequency outside the third frequency and the fourth frequency in the first signal input by the first band-pass filter circuit 10 is filtered, and the first signal with a frequency between the third frequency and the fourth frequency is retained, and the retained first signal is input into the third band-pass filter circuit 30 as the second signal.

[0084] Exemplarily, the inductor in the second bandpass filter circuit 20 can be implemented by a 3D glass-based, high-resistance silicon-based or ceramic-based winding inductor, or by a 2D winding inductor formed of a resin material, which is not limited here.

[0085] Exemplarily, the capacitor in the second band-pass filter circuit 20 may be implemented by an ultra-thin two-layer capacitor structure, or by a multi-layer thickened capacitor structure, which is not limited here.

[0086] The sizes of the inductors and capacitors in the second bandpass filter circuit 20 can be designed according to the device size, so that the size of the device can be reduced to millimeter level, which is much smaller than the common centimeter level device.

[0087] The second bandpass filter circuit 20 primarily suppresses low-frequency out-of-band and high-frequency out-of-band signals. By using relatively few components, it forms a transmission zero between the low frequencies of 0 GHz and 1 GHz. It also suppresses high frequencies above 6 GHz. Furthermore, the position of the transmission zero can be adjusted by fine-tuning the inductor and capacitor, effectively suppressing low-frequency out-of-band signals. The second bandpass filter circuit 20 also provides impedance matching for the connection between the first bandpass filter circuit 10 and the third bandpass filter circuit 30.

[0088] Exemplarily, the second band-pass filter circuit 20 is different from the first band-pass filter circuit 10. The second band-pass filter circuit 20 has a certain inhibitory effect outside the low-frequency band and the high-frequency band, and can connect the impedance matching of the first band-pass filter circuit 10 and the third band-pass filter circuit 30, thereby playing the role of a band-pass filter. As shown in Figure 6, the horizontal axis is frequency and the vertical axis is loss. It can be seen from Figure 6 that the second band-pass filter circuit 20 can generate a transmission zero point in the low-frequency range outside the band less than 1GHz. The transmission zero point can effectively suppress the transmission loss of the low-frequency part outside the passband and improve the suppression. At the same time, it can also suppress the high-frequency part greater than 6GHz, but the suppression effect is not obvious.

[0089] In the embodiment of the present disclosure, as shown in Figure 2, the third band-pass filter circuit 30 includes: an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a fifth inductor L5, a sixth inductor L6 and a ground terminal GND; wherein, the first electrode of the eighth capacitor C8 is connected to the second band-pass filter circuit 20, and the second electrode of the eighth capacitor C8 is connected to the second port B; the first electrode of the fifth inductor L5 is connected to the first electrode of the eighth capacitor C8, and the second electrode of the fifth inductor L5 is connected to the second electrode of the eighth capacitor C8; the first electrode of the ninth capacitor C9 is connected to the second electrode of the eighth capacitor C8, and the second electrode of the ninth capacitor C9 is connected to the first electrode of the sixth inductor L6; the second electrode of the sixth inductor L6 is connected to the ground terminal GND; the first electrode of the tenth capacitor C10 is connected to the first electrode of the sixth inductor L6, and the second electrode of the tenth capacitor C10 is connected to the second electrode of the tenth capacitor C10.

[0090] The first electrode of the eighth capacitor C8 in the third band-pass filter circuit 30 is connected to the second electrode of the fifth capacitor C5 in the second band-pass filter circuit 20 .

[0091] Exemplarily, the eighth capacitor C8 is a strip-shaped capacitor.

[0092] Among them, through the mutual cooperation of the eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the fifth inductor L5 and the sixth inductor L6, the second signal with a frequency outside the fifth frequency and the sixth frequency in the second signal input by the second band-pass filter circuit 20 is filtered, and the second signal with a frequency between the fifth frequency and the sixth frequency is retained, and the retained second signal is input into the second port B as the third signal.

[0093] Exemplarily, the connection between the capacitor and the inductor in the filter is a short and thick connection.

[0094] Exemplarily, the inductor in the third bandpass filter circuit 30 can be implemented by a 3D glass-based, high-resistance silicon-based or ceramic-based winding inductor, or by a 2D winding inductor formed of a resin material, which is not limited here.

[0095] Exemplarily, the capacitor in the third band-pass filter circuit 30 may be implemented by an ultra-thin two-layer capacitor structure, or by a multi-layer thickened capacitor structure, which is not limited here.

[0096] The sizes of the inductor and capacitor in the third bandpass filter circuit 30 can be designed according to the device size, so that the size of the device can be reduced to millimeter level, which is much smaller than the common centimeter level device.

[0097] Among them, the third bandpass filter circuit 30 mainly plays the role of suppressing high and low frequency out-bands. By using relatively few components, a transmission zero point is formed at 5.3GHz outside the high frequency band, and a transmission zero point can be formed at 1.6GHz outside the low frequency band. The position of the transmission zero point can also be adjusted by fine-tuning the inductor and capacitor for frequency, which plays a good role in high frequency out-band suppression.

[0098] For example, the third band-pass filter circuit 30 has a different function than the first band-pass filter circuit 10 and the second band-pass filter circuit 20. The third band-pass filter circuit 30 mainly suppresses high-frequency out-of-band signals and can generate transmission zeros at 1.6 GHz and 5.2 GHz, effectively blocking the passage of signals near these two frequencies, thereby suppressing high-frequency out-of-band signals. The third band-pass filter circuit 30 does not have a significant suppressive effect on low-frequency out-of-band signals, but it does have a relatively significant suppressive effect on high-frequency out-of-band signals. As shown in FIG7 , where the horizontal axis represents frequency and the vertical axis represents loss, FIG7 shows that the third band-pass filter circuit 30 can generate additional transmission zeros in the high-frequency out-of-band range. These transmission zeros can effectively suppress transmission loss in the high-frequency portion out of the passband, thereby improving suppression.

[0099] Exemplarily, the eighth capacitor C8 and the fifth inductor L5 are mainly generated at a transmission zero point of 5.2 GHz, and their impedance curves are shown in FIG8 , where the abscissa is frequency and the ordinate is amplitude.

[0100] Exemplarily, the ninth capacitor C9, the tenth capacitor C10 and the sixth inductor L6 are mainly generated at the transmission zero point of 1.6 GHz, and their impedance curves are shown in FIG9 , where the abscissa is frequency and the ordinate is amplitude.

[0101] In summary, the first band-pass filter circuit 10, the second band-pass filter circuit 20, and the third band-pass filter circuit 30 can all form the characteristics of a simple band-pass filter, but the first band-pass filter circuit 10 mainly serves to suppress low-frequency out-of-band, while the second band-pass filter circuit 20 can suppress both low frequencies between 0 GHz and 1 GHz and high frequencies above 6 GHz, and can serve to connect the first band-pass filter circuit 10 and the third band-pass filter circuit 30. The third band-pass filter circuit 30 mainly suppresses high frequencies out-of-band. The first band-pass filter circuit 10, the second band-pass filter circuit 20, and the third band-pass filter circuit 30 are combined to form the final filter. The filter curve is shown in Figure 10, where the horizontal axis is frequency and the vertical axis is loss. It can be seen that the filter has a good suppression effect on both low-frequency and high-frequency out-of-band, and the standing wave within the passband is also relatively good, which is conducive to tolerance consistency in production.

[0102] For example, the capacitance values ​​of the capacitors in the filter provided by the embodiments of the present disclosure can be set to be the same. This can reduce the design difficulty. Of course, the capacitance values ​​of these capacitors can also be set to different values ​​so that the capacitance values ​​of different capacitors can be specifically designed according to their functions.

[0103] For example, the inductors in the filter provided by the embodiments of the present disclosure can have the same inductance value. This can reduce the design difficulty. Of course, the inductance values ​​of these inductors can also be set to different values, so that the inductance values ​​of different inductors can be specifically designed according to their functions.

[0104] Illustratively, the capacitance value of the capacitor in the filter provided by the embodiment of the present disclosure ranges from 0.1 pF to 10 pF.

[0105] Illustratively, the inductance value of the inductor in the filter provided by the embodiment of the present disclosure ranges from 0.1 to 10 nH.

[0106] Illustratively, the filter disclosed herein is formed on a glass substrate.

[0107] For example, Figure 11 shows the structure of the filter. As can be seen from Figure 11, the first capacitor C1, the fourth capacitor C4, the fifth capacitor C5, and the eighth capacitor C8 constitute the main transmission path for the above-mentioned signal. The main transmission path is the shortest, ensuring minimal attenuation and optimal loss for the above-mentioned signal. Furthermore, when selecting the transmission path structure, long, large capacitors were used as the transmission path. This arrangement provides both a transmission path and space for expanding the capacitor layout, making the most rational use of the layout space.

[0108] Furthermore, the connections between the first inductor L1, the second inductor L2, the third inductor L3, the fourth inductor L4, the fifth inductor L5, and the sixth inductor L6 and the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 are preferably short and thick. This means that short and thick connections are used between the capacitors and inductors. The resistance of the connection is primarily related to the width and thickness of the connection. The thickness is determined by process parameters and cannot be adjusted in the layout. However, by using thicker connections, the attenuation of the above-mentioned signals is minimized and the loss is optimized.

[0109] Furthermore, as shown in FIG11 , the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, and the tenth capacitor C10 all use large-sized capacitors as much as possible. Because capacitors are made of very thin double-sided dielectrics, the dielectric between the electrodes of the capacitors is very thin, which is prone to process deviations. Using larger capacitors can effectively reduce the impact of process deviations and improve product consistency. It can also reduce the current density of the capacitors and increase the carrying power.

[0110] Exemplarily, FIG12 shows a cross-sectional structural diagram of the capacitor. It can be seen from FIG12 that the capacitor includes two layers of upper and lower electrodes (D1 and D2 in FIG12) and a dielectric J in the electrodes.

[0111] For example, Figure 13 shows the structure of the aforementioned inductor. As can be seen from Figure 13, the inductor is a 3D inductor, in which the inductor is fabricated in glass. The cylinders in the inductor glass are the metal pillars of the glass TGV. The inductor's redistribution layer (RDL) traces are fabricated on the upper and lower surfaces of the glass.

[0112] For example, the filter is composed of multiple inductors and capacitors. The capacitors are mainly made on the upper surface of the glass. The capacitors and inductors are connected by redistribution layer RDL (ReDistribution Layer) wiring. It also contains multiple bonding points PAD, which are used to input and output signals in components and for grounding.

[0113] The filter in the embodiment of the present disclosure is a high-frequency filter, which is used to eliminate interfering clutter signals and obtain a pure high-frequency signal by filtering the input signal or the output signal.

[0114] Based on the same inventive concept, embodiments of the present disclosure further provide an integrated passive device, including the aforementioned filter provided by embodiments of the present disclosure. The principles of this integrated passive device for solving the problem are similar to those of the aforementioned filter. Therefore, the implementation of this integrated passive device can refer to the implementation of the aforementioned filter, and any repetitions will not be repeated here.

[0115] Based on the same inventive concept, embodiments of the present disclosure further provide an electronic device, including the aforementioned integrated passive device provided by embodiments of the present disclosure. The principles of this electronic device for solving the problem are similar to those of the aforementioned integrated passive device. Therefore, the implementation of this electronic device can refer to the implementation of the aforementioned integrated passive device, and any repetitions will not be repeated here.

[0116] Exemplarily, the electronic device may be a radio frequency device.

[0117] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0118] Obviously, those skilled in the art may make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such changes and modifications of the embodiments of the present invention fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A filter, wherein: The filter comprises: a first port, a second port, a first band-pass filter circuit, a second band-pass filter circuit and a third band-pass filter circuit; The first bandpass filter circuit is connected to the first port and is configured to suppress a signal with a frequency between the first frequency and the second frequency in the initial signal input to the first port and then output a first signal; The second band-pass filter circuit is coupled to the first band-pass filter circuit, and is configured to receive the first signal and output a second signal whose frequency in the first signal is between a third frequency and a fourth frequency; The third band-pass filter circuit is coupled to the second band-pass filter circuit, and is configured to receive the second signal, and output a third signal of the second signal whose frequency is between the fifth frequency and the sixth frequency to the second port; wherein the first frequency is less than the second frequency; The third frequency is between the first frequency and the second frequency; The fifth frequency is between the third frequency and the second frequency.

2. The filter according to claim 1, wherein The sixth frequency is greater than the second frequency, and the fourth frequency is greater than the sixth frequency.

3. The filter according to claim 1 or 2, wherein: The first bandpass filter circuit comprises: a first capacitor, a second capacitor, a third capacitor, a first inductor, a second inductor and a ground terminal; A first electrode of the first capacitor is connected to the first port, and a second electrode of the first capacitor is connected to the second band-pass filter circuit; A first electrode of the first inductor is connected to a first electrode of the first capacitor, and a second electrode of the first inductor is connected to a second electrode of the first capacitor; The first electrode of the second capacitor is connected to the first electrode of the first capacitor, and the second electrode of the second capacitor is connected to the first electrode of the second inductor; The second electrode of the second inductor is connected to the ground terminal; A first electrode of the third capacitor is connected to a first electrode of the second inductor, and a second electrode of the third capacitor is connected to a second electrode of the second inductor.

4. The filter according to claim 3, wherein: The first capacitor is a strip capacitor.

5. The filter according to any one of claims 1 to 4, wherein: The second band-pass filter circuit comprises: a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a third inductor, a fourth inductor and a ground terminal; A first electrode of the fourth capacitor is connected to the first band-pass filter circuit, and a second electrode of the fourth capacitor is connected to a first electrode of the fifth capacitor; The second electrode of the fifth capacitor is connected to the third band-pass filter circuit; The first electrode of the sixth capacitor is connected to the first electrode of the fourth capacitor, and the second electrode of the sixth capacitor is connected to the ground terminal; The first electrode of the third inductor is connected to the first electrode of the sixth capacitor, and the second electrode of the third inductor is connected to the second electrode of the sixth capacitor; The first electrode of the seventh capacitor is connected to the second electrode of the fifth capacitor, and the second electrode of the seventh capacitor is connected to the ground terminal; A first electrode of the fourth inductor is connected to a first electrode of the seventh capacitor, and a second electrode of the fourth inductor is connected to a second electrode of the seventh capacitor.

6. The filter according to claim 5, wherein: At least one of the fourth capacitor and the fifth capacitor is a strip-type capacitor.

7. The filter according to any one of claims 1 to 6, wherein: The third band-pass filter circuit comprises: an eighth capacitor, a ninth capacitor, a tenth capacitor, a fifth inductor, a sixth inductor and a ground terminal; A first electrode of the eighth capacitor is connected to the second band-pass filter circuit, and a second electrode of the eighth capacitor is connected to the second port; The first electrode of the fifth inductor is connected to the first electrode of the eighth capacitor, and the second electrode of the fifth inductor is connected to the second electrode of the eighth capacitor; The first electrode of the ninth capacitor is connected to the second electrode of the eighth capacitor, and the second electrode of the ninth capacitor is connected to the first electrode of the sixth inductor; The second electrode of the sixth inductor is connected to the ground terminal; The first electrode of the tenth capacitor is connected to the first electrode of the sixth inductor, and the second electrode of the tenth capacitor is connected to the second electrode of the tenth capacitor.

8. The filter according to claim 7, wherein: The eighth capacitor is a strip-shaped capacitor.

9. The filter according to any one of claims 1 to 8, wherein: The connection between the capacitor and the inductor in the filter is a thick and short connection.

10. The filter according to any one of claims 1 to 9, wherein: The capacitance values ​​of the capacitors in the filter are the same.

11. The filter according to claim 10, wherein The capacitance value of the capacitor in the filter ranges from 0.1 pF to 10 pF.

12. The filter according to any one of claims 1 to 11, wherein: The inductance values ​​of the inductors in the filter are the same.

13. The filter according to claim 12, wherein: The inductance value of the inductor in the filter ranges from 0.1 to 10 nH.

14. The filter according to any one of claims 1 to 13, wherein: The filter is formed on a glass substrate.

15. The filter according to any one of claims 1 to 14, wherein: The filter is a high frequency filter.

16. An integrated passive device, wherein: Comprising a filter as described in any one of claims 1-15.

17. An electronic device, wherein: Comprising the integrated passive device as claimed in claim 16.

18. A display device, wherein: Comprising the electronic device as claimed in claim 17.

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