CN111952702A - A bandpass filter and electronic equipment - Google Patents

Abstract

The invention provides a band-pass filter and electronic equipment. The band-pass filter includes a base body, a first-order resonator and a second-order resonator arranged inside the base body, and input ends and The output end; the first-order resonator is above the second-order resonator in the height direction of the substrate, and the first-order resonator and the second-order resonator are partially cross-coupled; both the first-order resonator and the second-order resonator are It includes a first compensation stripline, a main resonance stripline and a second compensation stripline. The first compensation stripline, the main resonance stripline and the second compensation stripline are arranged at intervals along the height direction of the base body. The resonant stripline is U-shaped. Compared with the prior art, the band-pass filter of the present invention can maximize the use of the internal space of the band-pass filter, which is beneficial to realize the miniaturization design of the filter.

Description

A bandpass filter and electronic equipment

technical field

The invention belongs to the technical field of filters, and more particularly, relates to a band-pass filter and electronic equipment.

Background technique

With the development of modern society informatization, wireless communication technology is widely used in all walks of life in society, and new communication standards and systems emerge in an endless stream. The application in multiple fields and the increasingly tight spectrum resources also promote the continuous innovation of wireless communication technology, and the radio frequency communication system continues to develop in the direction of miniaturization and high performance. As a key device in radio frequency communication systems, filter size reduction has always been a research focus of modern radio frequency communication systems. However, it is difficult to further miniaturize existing filters.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a band-pass filter to solve the technical problem that the filter is difficult to miniaturize in the prior art.

In order to achieve the above object, the technical solution adopted in the present invention is to provide a band-pass filter, comprising a base body, a first-order resonator and a second-order resonator arranged inside the base body, and Input and output terminals at both ends of the base body;

the first-order resonator is above the second-order resonator in the height direction of the substrate and the first-order resonator and the second-order resonator are partially cross-coupled;

The first-order resonator and the second-order resonator each include a first compensation stripline, a main resonance stripline, and a second compensation stripline, the first compensation stripline, the main resonance stripline The stripline and the second compensation stripline are arranged at intervals along the height direction of the base body, and the main resonance stripline is U-shaped;

One end of the first compensation stripline is grounded, and the other end is suspended; both ends of the main resonance stripline are suspended, and the main resonance stripline of the first-order resonator is connected to the input end , the main resonance stripline of the second-order resonator is connected to the output end; one end of the second compensation stripline is grounded, and the other end is suspended.

In one embodiment, the main resonant stripline includes a first connection segment, a second connection segment and a third connection segment connected in sequence, the first connection segment and the third connection segment are parallel to each other;

The second connection section of the main resonance stripline of the first-order resonator and the third connection section of the main resonance stripline of the second-order resonator are arranged to intersect, and the main resonance of the first-order resonator The third connecting section of the stripline is arranged to intersect with the second connecting section of the main resonance stripline of the second order resonator.

In one embodiment, the first order resonator and the second order resonator each include two of the first compensation striplines and two of the second compensation striplines; each of the main resonance strips In the stripline, the first connection segment and the third connection segment are respectively arranged opposite to the corresponding first compensation stripline, and the first connection segment and the third connection segment are respectively associated with the corresponding first compensation stripline. The second compensation striplines are arranged oppositely.

In one embodiment, the distance between the first compensation stripline and the main resonance stripline is less than or equal to 0.06 mm, and the distance between the second compensation stripline and the main resonance stripline is less than or equal to 0.06 mm. Equal to 0.06mm.

In one embodiment, the bandpass filter includes a first tap connecting the main resonant stripline of the first order resonator to the input and a main resonant strip connecting the main resonant strip of the second order resonator The shape line is connected to the second tap of the output terminal.

In one embodiment, the projection of the input end, the first tap and the first order resonator in the height direction of the substrate is the same as the output end, the second tap and the second The projection of the order resonator on the height direction of the substrate is center-symmetrical.

In one embodiment, the first tap is a single-layer folded stripline, and the second tap is a single-layer folded stripline.

In one embodiment, the band-pass filter further includes two side ground plates disposed on the left and right sides of the base body, and one end of the first compensation strip line grounded is connected to the corresponding side ground plates , and the grounded end of the second compensation strip line is connected to the corresponding side grounding plate.

In one embodiment, the band-pass filter further includes an upper ground plate provided on the upper side of the base body and a lower ground plate provided on the lower side of the base body.

The present invention also provides an electronic device comprising the bandpass filter as described above.

The beneficial effects of the band-pass filter and the electronic device provided by the present invention are: compared with the prior art, the first-order resonator and the second-order resonator of the band-pass filter of the present invention both include a first compensation stripline , the main resonance stripline and the second compensation stripline, by setting the first compensation stripline and the second compensation stripline respectively on the upper and lower sides of the main resonance stripline, so that the first compensation stripline and the second compensation stripline The parallel-plate capacitors formed by coupling the two compensation striplines with the main resonant stripline are equivalently loaded on the main resonant stripline, providing compensation capacitance for the first-order resonator and the second-order resonator, and increasing the first-order resonator. and the electrical length of the second-order resonator, effectively reducing the physical length of the first-order resonator and the second-order resonator, and realizing the miniaturization design of the filter; The stripline is set in a bent shape, which can ensure the physical length of the main resonance stripline, so that the internal space of the bandpass filter can be maximized, and the miniaturization design of the filter can be realized.

By adopting the above-mentioned band-pass filter, the electronic device of the present invention is advantageous for realizing a miniaturized design.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

1 is a schematic perspective view of a three-dimensional structure of a bandpass filter provided by an embodiment of the present invention;

2 is a schematic diagram of an exploded perspective structure of a bandpass filter provided by an embodiment of the present invention;

3 is a schematic three-dimensional structural diagram of a first-order resonator provided by an embodiment of the present invention;

4 is a schematic diagram of a front view structure of a bandpass filter provided by an embodiment of the present invention;

5 is a schematic top-view structural diagram of a bandpass filter provided by an embodiment of the present invention;

6 is an equivalent circuit diagram of a bandpass filter provided by an embodiment of the present invention;

FIG. 7 is a simulation result diagram of a bandpass filter provided by an embodiment of the present invention.

Among them, each reference sign in the figure:

100-substrate; 210-first-order resonator; 220-second-order resonator; 230-first compensation stripline; 240-main resonance stripline; 241-first connecting segment; 242-second connecting segment ; 243 - the third connection section; 250 - the second compensation strip line; 310 - the input end; 320 - the output end; 410 - the first tap; 420 - the second tap; ; 611-upper gap; 612-upper adhesion slot; 620-lower ground plate; 621-lower gap; 622-lower adhesion slot.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

It is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated A device or element must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first", "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

Referring to FIGS. 1 to 3 , an embodiment of the present invention provides a band-pass filter, including a substrate 100 , a first-order resonator 210 , a second-order resonator 220 , an input end 310 and an output end 320 , wherein the first The first-order resonator 210 and the second-order resonator 220 are disposed inside the base body 100 , and the input end 310 and the output end 320 are respectively disposed at the input end 310 and the output end 320 at both ends of the base body 100 . Specifically, the first-order resonator 210 is above the second-order resonator 220 in the height direction of the substrate 100 and the first-order resonator 210 and the second-order resonator 220 are partially cross-coupled; the first-order resonator 210 and the second order resonator 220 each include a first compensation stripline 230, a main resonance stripline 240, and a second compensation stripline 250, the first compensation stripline 230, the main resonance stripline 240, and the second compensation stripline 230 The striplines 250 are arranged at intervals along the height direction of the base 100, and the main resonance stripline 240 is U-shaped; one end of the first compensation stripline 230 is grounded, and the other end is suspended; both ends of the main resonance stripline 240 are suspended set up, and the main resonance stripline 240 of the first-order resonator 210 is connected to the input end 310, the main resonance stripline 240 of the second-order resonator 220 is connected to the output end 320; one end of the second compensation stripline 250 Ground, and the other end is left floating. The band-pass filter in the embodiment of the present invention includes a first-order resonator 210 and a second-order resonator 220, that is, the band-pass filter is a second-order band-pass filter. The filter may also include more resonators, which is not limited herein.

The beneficial effects of the bandpass filter of the embodiment of the present invention are:

(1) Compared with the prior art, in the bandpass filter of the embodiment of the present invention, the first-order resonator 210 and the second-order resonator 220 both include a first compensation stripline 230 and a main resonance stripline 240 and the second compensation stripline 250, by disposing the first compensation stripline 230 and the second compensation stripline 250 on the upper and lower sides of the main resonance stripline 240 respectively, so that the first compensation stripline 230 and the second compensation stripline 250 are The parallel plate capacitors formed by the compensation stripline 250 coupled with the main resonance stripline 240 are equivalently loaded on the main resonance stripline 240 to provide compensation capacitance for the first-order resonator 210 and the second-order resonator 220, and increase the first-order resonator 210 and the second-order resonator 220. The electrical lengths of the first-order resonator 210 and the second-order resonator 220 effectively reduce the physical lengths of the first-order resonator 210 and the second-order resonator 220, and realize the miniaturized design of the filter;

(2) The main resonant stripline 240 is U-shaped. By setting the main resonant stripline 240 in a bent shape, the physical length of the main resonant stripline 240 can be ensured, thereby maximizing the utilization of the interior of the bandpass filter. space, which is conducive to realizing the miniaturization design of the filter.

Further, as a specific implementation of the present invention, in the bandpass filter of the embodiment of the present invention, the base body 100 is provided with an upper plane and a lower plane, wherein the upper plane is located above the lower plane in the height direction of the base body 100 , the first-order resonator 210 is located on the upper plane, the second-order resonator 220 is located on the lower plane, and the first-order resonator 210 and the second-order resonator 220 are spaced apart in the height direction of the substrate 100, so set, The first-order resonator 210 and the second-order resonator 220 do not intersect in the direction perpendicular to the height direction of the base 100 , and the first-order resonator 210 and the second-order resonator 220 are only at the height of the base 100 intersect in the direction.

Further, as a specific embodiment of the present invention, please refer to FIG. 3 , and in conjunction with FIG. 2 , the structures of the first-order resonator 210 and the second-order resonator 220 are the same, and the main resonant stripline 240 includes the first-order resonator 210 and the second-order resonator 220 connected in sequence. A connecting section 241, a second connecting section 242 and a third connecting section 243, the first connecting section 241 and the third connecting section 243 are parallel to each other; the second connecting section 242 of the main resonance stripline 240 of the first-order resonator 210 Intersect with the third connection section 243 of the main resonance stripline 240 of the second-order resonator 220 , and the third connection section 243 of the main resonance stripline 240 of the first-order resonator 210 and the second-order resonator 220 The second connection sections 242 of the main resonance stripline 240 are arranged to intersect, so that the first-order resonator 210 and the second-order resonator 220 are partially cross-coupled in the height direction of the base body 100 .

Further, as a specific embodiment of the present invention, please refer to FIG. 3 and FIG. 4 , the first-order resonator 210 and the second-order resonator 220 each include two first compensation striplines 230 and two second compensation striplines Stripline 250; in each main resonance stripline 240, the first connection segment 241 and the third connection segment 243 are respectively disposed opposite to the corresponding first compensation stripline 230, and the first connection segment 241 and the third connection segment 243 are respectively disposed opposite to the corresponding second compensation striplines 250 . Through the above arrangement, the third connection segment 243 disposed opposite to the first connection segment 241 and the first compensation stripline 230 above it, between the first connection segment 241 and the second compensation stripline 250 below it, and the opposite A parallel plate capacitor equivalently loaded on the main resonance stripline 240 is formed between the first compensation stripline 230 above and between the oppositely arranged third connection segment 243 and the second compensation stripline 250 below, which is The resonator provides a large-value compensation capacitor, increases the electrical length of the resonator, reduces the resonant frequency of the resonator, and greatly reduces the physical size of the resonator, which is beneficial to the miniaturized design of the filter.

Further, as a specific embodiment of the present invention, the width of the first compensation stripline 230 is slightly larger than the width of the main resonance stripline 240. Specifically, the width of the first compensation stripline 230 is slightly larger than that of the first compensation stripline 230. The width of the first connection segment 241 and the width of the third connection segment 243 are set in such a way that when the first compensation stripline 230 and the first connection segment 241 are slightly misaligned during the lamination process, the first compensation stripline 230 and the The area of the overlapping portion of a connection section 241 remains unchanged; when the first compensation stripline 230 and the third connection section 243 are slightly misaligned during the lamination process, the overlap between the first compensation stripline 230 and the third connection section 243 The area of the part remains unchanged, so that the capacitance value of the compensation capacitor is stable and the yield of the filter is improved.

As an optional implementation manner of the present invention, in the bandpass filter of the embodiment of the present invention, the widths of the first connection segment 241 and the third connection segment 243 are both 0.02 mm smaller than the width of the first compensation stripline 230, for example , the widths of the first connecting segment 241 and the third connecting segment 243 are both 0.3 mm, and the width of the first compensation strip line 230 is 0.32 mm. It can be understood that the widths of the first connection segment 241 , the third connection segment 243 and the first compensation stripline 230 can be appropriately adjusted according to actual selection and specific requirements, which are not limited here.

Further, as a specific embodiment of the present invention, the width of the second compensation stripline 250 is slightly larger than the width of the main resonance stripline 240. Specifically, the width of the second compensation stripline 250 is slightly larger than the width of the second compensation stripline 250. The width of the first connection segment 241 and the width of the third connection segment 243 are set in such a way that when the second compensation stripline 250 and the first connection segment 241 are slightly misaligned during the lamination process, the second compensation stripline 250 and the first connection segment 241 are slightly misaligned. The area of the overlapping portion of a connecting segment 241 remains unchanged; when the second compensation stripline 250 and the third connecting segment 243 are slightly misaligned during the lamination process, the overlap between the second compensation stripline 250 and the third connecting segment 243 The area of the part remains unchanged, so that the capacitance value of the compensation capacitor is stable and the yield of the filter is improved.

As an optional implementation manner of the present invention, in the bandpass filter of the embodiment of the present invention, the widths of the first connection segment 241 and the third connection segment 243 are both smaller than the width of the second compensation stripline 250 by 0.02 mm, for example , the widths of the first connecting segment 241 and the third connecting segment 243 are both 0.3 mm, and the width of the second compensation stripline 250 is 0.32 mm. It can be understood that the widths of the first connection segment 241 , the third connection segment 243 and the second compensation stripline 250 can be appropriately adjusted according to actual selection and specific requirements, which are not limited here.

As an optional embodiment of the present invention, the distance between the first compensation stripline 230 and the main resonance stripline 240 is less than or equal to 0.06 mm, and the distance between the second compensation stripline 250 and the main resonance stripline 240 is less than or equal to 0.06 mm. is equal to 0.06 mm, thereby effectively ensuring that the first compensation stripline 230 and the second compensation stripline 250 form compensation capacitances with the main resonance stripline 240 respectively. It should be noted that the above-mentioned pitch refers to the distance in the height direction of the base body 100 . Of course, according to the actual selection and specific requirements, the distance between the first compensation stripline 230 and the main resonance stripline 240 and the distance between the second compensation stripline 250 and the main resonance stripline 240 can be adjusted appropriately. This is not a unique limitation.

As an optional embodiment of the present invention, the distance between the first compensation stripline 230 and the main resonance stripline 240 is equal to the distance between the second compensation stripline 250 and the main resonance stripline 240, that is, the first compensation strip The stripline 230 and the second compensation stripline 250 are arranged mirror-symmetrically with respect to the main resonant stripline 240. This arrangement can ensure the symmetry of the first-order resonator 210 and the second-order resonator 220 and reduce the passband insertion loss. . In this embodiment, the main resonance stripline 240 of the first-order resonator 210 is located in the upper plane, the main resonance stripline 240 of the second-order resonator 220 is located in the lower plane, and the first order resonator 210 A compensation stripline 230 is located below the second compensation stripline 250 of the second-order resonator 220 in the height direction of the substrate 100 .

Further, as a specific embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 4 , the band-pass filter includes a first-order resonant stripline 240 connecting the main resonance stripline 240 of the first-order resonator 210 with the input end 310 . A tap 410 and a second tap 420 connecting the main resonant stripline 240 of the second order resonator 220 to the output terminal 320 . In this embodiment, the first connection section 241 of the main resonance stripline 240 of the first-order resonator 210 is connected to the input end 310 through the first tap 410 , and the main resonance stripline 240 of the second-order resonator 220 The first connection section 241 is connected to the output terminal 320 through the second tap 420 .

As an optional embodiment of the present invention, the first tap 410 is a single-layer folded stripline, and the second tap 420 is a single-layer folded stripline, which can ensure connection reliability and reduce the influence of parasitic parameters. In this embodiment, the first tap 410 and the main resonance stripline 240 of the first-order resonator 210 are located in the same plane, and the second tap 420 and the main resonance stripline 240 of the second-order resonator 220 are located in the same plane, The reliability of the connection can be further guaranteed.

Further, as a specific embodiment of the present invention, as shown in FIG. 4 and FIG. 5 , the projection of the input end 310 , the first tap 410 and the first order resonator 210 in the height direction of the base body 100 is the same as that of the output end 320 , The projections of the second tap 420 and the second-order resonator 220 on the height direction of the base body 100 are center-symmetrical. 6 is an equivalent circuit diagram of a bandpass filter according to an embodiment of the present invention, wherein Z ₀ is the characteristic impedance of the transmission line, C _e is the coupling capacitance between the two resonators, θ ₁ and θ ₂ are the electrical lengths. Said, the first-order resonator 210 is divided into two parts with electrical lengths θ _{1 and θ 2 by the first tap 410, the second-order resonator 220 is divided into two parts with electrical lengths θ 1 and θ 2 by the} second tap 420, the first The electrical lengths of the two transmission lines separated by the tap 410 and the second tap 420 are exactly the same. By analyzing the transmission matrix of the equivalent circuit prototype, it can be known that at the corresponding frequency points of θ1≈π/2 and θ2≈π/2, transmission zeros will be generated, which are located in the upper and lower sidebands of the bandpass filter, respectively. It can be seen that, through the above setting, the electrical length of the signal passing through the two transmission paths separated by the first tap 410 and the second tap 420 is the same, and the resulting phase difference is zero. In the case of any additional electrodes without affecting the frequency response of the passband, a transmission zero is generated in each of the upper and lower sidebands, which improves the square coefficient of the bandpass filter and the passband selectivity.

Further, as a specific embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 3 , the bandpass filter further includes two side ground plates 500 arranged on the left and right sides of the base body 100 , and the side ground plates 500 Specifically, the grounded end of the first compensation strip line 230 can be connected to the corresponding side ground plate 500, and the grounded end of the second compensation strip line 250 can be connected to the corresponding side ground plate 500, so that the One end of the first compensation stripline 230 and one end of the second compensation stripline 250 are grounded.

Further, as a specific embodiment of the present invention, as shown in FIG. 1 and FIG. 2 , the bandpass filter further includes an upper ground plate 610 arranged on the upper side of the base body 100 and a lower ground plate 610 arranged at the lower side of the base body 100 The floor 620, the upper grounding plate 610 and the lower grounding plate 620 can be, but are not limited to, metal parts, so that the upper grounding plate 610, the lower grounding plate 620 and the two side grounding plates 500 are enclosed to form a cavity structure. The first-order resonator 210 , the second-order resonator 220 , the first tap 410 and the second tap 420 are all located in the cavity structure, which can reduce electromagnetic radiation loss and reduce the influence of external electromagnetic interference signals on the performance of the band-pass filter. In this embodiment, the upper ground plane 610 is connected to the side ground plane 500 , and the lower ground plane 620 is connected to the side ground plane 500 .

Further, as a specific embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 5 , the edges of the upper ground plate 610 corresponding to the input end 310 and the output end 320 are respectively provided with upper notches 611 for forming a dielectric region, The edges of the lower ground plate 620 corresponding to the input end 310 and the output end 320 are respectively provided with a lower gap 621 for forming a dielectric region, the input end 310 is provided corresponding to an upper gap 611 and a lower gap 621, and the output end 320 corresponds to an upper gap 611 and a lower gap 621. A lower gap 621 is provided to reduce the capacitance to ground of the input end 310/output end 320, so as to achieve the purpose of impedance matching.

Further, as a specific embodiment of the present invention, as shown in FIG. 1 , FIG. 2 and FIG. 5 , one or more upper bonding holes 612 are formed on the edge of the upper ground plate 610 corresponding to the side ground plate 500 . 620 corresponding to the edge of the side ground plate 500 is provided with one or more lower bonding holes 622. The functions of the upper bonding holes 612 and the lower bonding holes 622 are to make the upper and lower ceramic sheets better in the lamination process of the LTCC process. the adhesion together, as well as preventing cracking of printed metal electrode layers with large areas during the sintering process.

As an optional embodiment of the present invention, the base body 100 may be a ceramic medium, specifically, but not limited to, a ceramic powder with a dielectric constant of 11-15 and a dielectric loss factor tanα≤0.0005. For example, the base body 100 may be formed by using It is made of ULF140 ceramic powder with a dielectric constant of 13.3. Of course, the material of the base body 100 can be appropriately modified according to actual selection and specific requirements, which is not limited herein.

As an optional embodiment of the present invention, the base body 100 can be a rectangular cube with an overall size of 4mm×3.6mm×2mm. Of course, the shape and specific size of the base body 100 can be appropriately modified according to actual selection and specific requirements. There is no unique limitation here.

Further, Fig. 7 is the simulation result diagram of the band-pass filter of the embodiment of the present invention, in the figure S11 is the return loss curve on each frequency in the simulation; S21 is the insertion loss curve on each frequency in the simulation; It can be known from the simulation results, The center frequency of the band-pass filter is 2.08GHz, the 3-dB bandwidth is about 160MHz, the insertion loss in the passband is less than 1.1dB, the return loss in the band is greater than 23dB, and there is a transmission zero at 1.79GHz and 2.84GHz. , with good sideband selectivity. In this embodiment, the total length of the main resonant stripline 240 is 6.6 mm, which is only one-sixth of the wavelength of the dielectric electromagnetic wave corresponding to the filter center frequency of 2.08 GHz, and is much smaller than the length of the conventional stripline half-wavelength resonator.

Embodiments of the present invention further provide an electronic device, including the above-mentioned band-pass filter, which is beneficial to realize the miniaturization design of the electronic device.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. a band-pass filter, it is characterized in that, comprise base body, the first-order resonator and the second-order resonator that are arranged in the interior of described base body, and the input end and output that are respectively arranged at both ends of described base body end; the first-order resonator is above the second-order resonator in the height direction of the substrate and the first-order resonator and the second-order resonator are partially cross-coupled; The first-order resonator and the second-order resonator each include a first compensation stripline, a main resonance stripline, and a second compensation stripline, the first compensation stripline, the main resonance stripline The stripline and the second compensation stripline are arranged at intervals along the height direction of the base body, and the main resonance stripline is U-shaped; One end of the first compensation stripline is grounded, and the other end is suspended; both ends of the main resonance stripline are suspended, and the main resonance stripline of the first-order resonator is connected to the input end , the main resonance stripline of the second-order resonator is connected to the output end; one end of the second compensation stripline is grounded, and the other end is suspended. 2 . The bandpass filter according to claim 1 , wherein the main resonant stripline comprises a first connection section, a second connection section and a third connection section which are connected in sequence, and the first connection section parallel to the third connecting segment; The second connection section of the main resonance stripline of the first-order resonator and the third connection section of the main resonance stripline of the second-order resonator are arranged to intersect, and the main resonance of the first-order resonator The third connecting section of the stripline is arranged to intersect with the second connecting section of the main resonance stripline of the second order resonator. 3. The bandpass filter of claim 2, wherein the first order resonator and the second order resonator each comprise two of the first compensation striplines and two of the second order resonators Compensation stripline; in each main resonance stripline, the first connection segment and the third connection segment are respectively disposed opposite to the corresponding first compensation stripline, and the first connection segment and the third connection segments are respectively arranged opposite to the corresponding second compensation striplines. 4 . The bandpass filter of claim 1 , wherein the distance between the first compensation stripline and the main resonance stripline is less than or equal to 0.06 mm, and the second compensation stripline The distance from the main resonance stripline is less than or equal to 0.06mm. 5. The bandpass filter of claim 1, wherein the bandpass filter comprises a first tap connecting a main resonant stripline of the first order resonator to the input and A second tap connecting the main resonant stripline of the second order resonator to the output. 6 . The bandpass filter according to claim 5 , wherein the projection of the input end, the first tap and the first order resonator in the height direction of the substrate is related to the output. 7 . The projections of the end, the second tap and the second order resonator on the height direction of the base body are center-symmetrical. 7. The bandpass filter of claim 5, wherein the first tap is a single-layer folded stripline, and the second tap is a single-layer folded stripline. 8. The band-pass filter according to any one of claims 1 to 7, wherein the band-pass filter further comprises two side ground plates arranged on the left and right sides of the base body, the first One grounded end of a compensation stripline is connected to the corresponding side ground plane, and one grounded end of the second compensation stripline is connected to the corresponding side ground plane. 9 . The band-pass filter according to claim 8 , wherein the band-pass filter further comprises an upper ground plate arranged on the upper side of the base body and a lower ground plate arranged at the lower side of the base body. 10 . floor. 10. An electronic device, characterized by comprising the bandpass filter according to any one of claims 1 to 9.

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