CN214411477U - Improved dielectric filter - Google Patents

Abstract

An object of the utility model is to provide a through structural coupling in order to reach required frequency range and improve the filter of institutional advancement of outband attenuation ratio through outband attenuation zero, specifically, this dielectric filter includes the dielectric member, N +4 perforating holes, ground metal layer, input electrode and output electrode, forms fretwork area A on the open face of dielectric member, and the left and right sides is equipped with two fretwork area B respectively on this bottom surface, and these two fretwork area B extend to respectively the open face on.

Description

Improved dielectric filter

Technical Field

The utility model relates to a dielectric filter.

Background

In general, a dielectric filter is composed of a dielectric block made of a ceramic material and a plurality of coaxial resonance holes penetrating the dielectric block. The dielectric filter requires a minimum insertion loss in a pass band and a minimum attenuation ratio outside the pass band, and ensures the quality of signal transmission of the communication system. The open side of the dielectric filter is coated with metal patterns, the design of the patterns can be different according to the required operating frequency spectrum of the communication system, and if the design of the patterns on the surface of the filter is not reasonable, the characteristics of the filter can be affected, and the quality of communication signals can be affected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a through structural coupling in order to reach required service frequency range and improve the filter of institutional advancement of outband attenuation ratio through outband attenuation zero, specifically, this dielectric filter includes:

the dielectric body is provided with an open surface, a short circuit surface, a top surface, a bottom surface and two side surfaces, wherein a hollow area A is formed on the open surface, two hollow areas B are respectively arranged on the left side and the right side of the bottom surface, and the two hollow areas B respectively extend to the open surface;

n +4 through holes, wherein N is a natural number not less than 1, the through holes penetrate through the dielectric body at intervals from left to right, one end of each through hole is located on the open surface, the other end of each through hole is located on the short-circuit surface, the inner walls of the N +4 through holes are provided with metal layers to form N +4 resonant holes, and the N +4 resonant holes comprise a first resonant hole, a second resonant hole, N middle resonant holes, a penultimate resonant hole and a penultimate resonant hole which are sequentially arranged from left to right;

the grounding metal layer is arranged on the top surface, the bottom surface, the two side surfaces and the areas of the open surface and the short circuit surface outside the hollow area A and the hollow area B, wherein the grounding metal layer arranged on the short circuit surface is electrically connected with the metal layer on the inner wall of the through hole to form a short circuit end, and the through hole is electrically connected with the open surface to form an open end;

the hollow-out area A comprises a first sub-frame area surrounding a first resonance hole, a second sub-frame area surrounding a second resonance hole, a penultimate sub-frame area surrounding a penultimate resonance hole, a last sub-frame area surrounding the penultimate resonance hole and N middle sub-frame areas surrounding N middle resonance holes respectively, and metal blocks are formed between the first sub-frame area and the first resonance hole, between the second resonance hole and the second sub-frame area, between the penultimate resonance hole and the penultimate sub-frame area, between the N middle resonance holes and the N middle sub-frame areas respectively;

wherein, one hollow area B extends to the open surface and both ends thereof are respectively connected with the first sub-frame area and the second sub-frame area on the open surface, the other hollow area B extends to the open surface and both ends thereof are respectively connected with the sixth sub-frame area and the seventh sub-frame area on the open surface,

one end of the input electrode is arranged at one hollow-out area B, and the other end of the input electrode extends to the open surface to be L-shaped and is connected with the metal layer on the open surface, so that the input electrode is used for connecting a signal to the second resonance hole and simultaneously forms an external zero point with the first resonance hole;

and one end of the output electrode is arranged at one hollow-out area B, and the other end of the output electrode extends to the open surface to be L-shaped and is connected with the metal layer on the open surface, so that the input electrode is used for connecting a signal to the penultimate resonance hole and simultaneously forms an external zero point with the penultimate resonance hole.

In some embodiments, the number of the resonance holes is seven, and the resonance holes include a first resonance hole, a second resonance hole, a third resonance hole, a fourth resonance hole, a fifth resonance hole, a sixth resonance hole, and a seventh resonance hole, and the leading sub-frame region, the second resonance hole, the third resonance hole, the fourth resonance hole, the fifth resonance hole, the sixth resonance hole, and the seventh resonance hole are surrounded by the leading sub-frame region, the second sub-frame region, the third sub-frame region, the fourth sub-frame region, the penultimate sub-frame region, and the last sub-frame region, respectively.

In some embodiments, a first metal segment, a second metal segment, a third metal segment, a fourth metal segment, a fifth metal segment and a fifth metal segment are respectively formed between the first sub-frame region and the second sub-frame region, between the second sub-frame region and the third sub-frame region, between the third sub-frame region and the fourth sub-frame region, between the fifth sub-frame region and the penultimate sub-frame region, and between the penultimate sub-frame region and the last sub-frame region, so that an inductive coupling is formed between the first resonant hole and the second resonant hole, between the second resonant hole and the third resonant hole, between the third resonant hole and the fourth resonant hole, between the fifth resonant hole and the penultimate resonant hole, and between the penultimate resonant hole and the last resonant hole; and a hollow section is formed between the fourth sub-frame area and the fifth sub-frame area, so that the fourth resonance hole and the fifth resonance hole form capacitive coupling.

In some embodiments, one end of the first metal segment, the second metal segment, the third metal segment, the fourth metal segment and the fifth metal segment is located in the hollow area a on the open surface, and the other end of the first metal segment, the second metal segment, the third metal segment, the fourth metal segment and the fifth metal segment is connected to the metal layer on the open surface.

In some embodiments, the N +4 resonant holes are arranged in parallel at equal heights in the dielectric body.

In some embodiments, an open end face pattern formed by the hollow area A and the metal layer is formed on the open face,

the metal layer consists of a first metal block, a second metal block, N middle metal blocks, a penultimate metal block, a last metal block, a first metal sideline, a second metal line segment, a third metal line segment and a fourth metal line segment, wherein the first metal sideline is arranged at the joint of the open surface and the adjacent two sides, top surface and bottom surface of the open surface and is respectively connected with the left side, the right side, the bottom surface and the top surface; the second metal line segment is arranged at the lower side of the opening surface corresponding to the first sub-frame area and the second sub-frame area, the third metal line segment is arranged at the lower side of the opening surface corresponding to the N middle sub-frame areas, and the fourth metal line segment is arranged at the lower side of the opening surface corresponding to the penultimate sub-frame area and the last sub-frame area;

the first metal block, the second metal block, the N middle metal blocks, the penultimate metal block and the last metal block are respectively formed on the peripheral sides of the first resonance hole, the second resonance hole, the N middle resonance holes, the penultimate resonance hole and the last resonance hole;

the first sub-frame area, the second sub-frame area, the N middle sub-frame areas, the penultimate sub-frame area and the last sub-frame area are respectively formed on the peripheral sides of the first metal block, the second metal block, the N middle metal blocks, the penultimate metal block and the last metal block.

In some embodiments, one of the hollow-out regions B is U-shaped, and both sides thereof extend to the open surface respectively, and both ends thereof are connected to the first sub-frame region and the second sub-frame region on the open surface respectively; one end of the input electrode is arranged at the hollow-out area B, and the other end of the input electrode extends to the open surface and is electrically connected with the second metal line segment of the open surface;

in some embodiments, the dielectric filter further comprises a metal shield.

The utility model provides a modified dielectric filter, metal pattern locate dielectric filter on the terminal surface that opens a way, increase the structural coupling of wave filter in order to reach required service frequency range on the one hand, and on the other hand passes through outband decay zero point, improves outband decay ratio.

Drawings

Fig. 1-4 are schematic structural diagrams of the dielectric filter provided by the present invention;

fig. 5 is a circuit equivalent diagram of the dielectric filter provided by the present invention;

fig. 6 is a measurement curve diagram of the dielectric filter provided by the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "longitudinal", "transverse", "top", "bottom", "inner", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1-4, an embodiment of the present invention provides an improved dielectric filter, which includes a dielectric body, N +4 through holes, a grounded metal layer, an input electrode, and an output electrode:

specifically, the dielectric body 100 has an open surface 101, a short-circuit surface 102, a top surface 104, a bottom surface 103, and two side surfaces 105,106, wherein a hollow area a119 is formed on the open surface, two hollow areas B116,117 are respectively disposed on the left and right sides of the bottom surface, and the two hollow areas B116,117 respectively extend to the open surface;

n +4 through holes are arranged through the dielectric body at intervals from left to right, wherein N is a natural number not less than 1, one end of each through hole is positioned on the open surface 101, the other end of each through hole is positioned on the short-circuit surface 102, the inner walls of the N +4 through holes are provided with metal layers to form N +4 resonant holes, and specifically, the N +4 resonant holes comprise a first resonant hole 107, a second resonant hole 108, N middle resonant holes 109,110,111, a penultimate resonant hole 112 and a penultimate resonant hole 113 which are sequentially arranged from left to right;

the grounding metal layers are arranged on the top surface, the bottom surface, the two side surfaces and the areas of the open surface and the short-circuit surface outside the hollow-out area A119 and the hollow-out areas B116 and 117, namely the metal layers are used as shielding electrodes or grounded external metal shielding case conductors; the open surface 101 and the short circuit surface 102 except the hollow-out area A119 and the hollow-out areas B116,117, the other areas are coated with metal layers, the open surface 301 is formed by the hollow-out area A and the metal layers to form an open end surface pattern, thus, the top surface, the bottom surface, the two side surfaces and the open surface are electrically connected with the short circuit surface through the metal layers (the metal block surrounding the open end of each through hole is electrically connected with the metal layer of the through hole), wherein the grounding metal layer arranged on the short circuit surface 102 is electrically connected with the metal layer of the inner wall of the through hole to form a short circuit end, and the through hole is electrically connected with the open surface 101 to form an open end;

and the hollow area A forming the open face end face pattern is divided into the following areas: the hollow-out region a119 includes a first sub-frame region surrounding the first resonance hole 107, a second sub-frame region surrounding the second resonance hole 108, a penultimate sub-frame region surrounding the penultimate resonance hole 112, a last sub-frame region surrounding the penultimate resonance hole 113, and N middle sub-frame regions surrounding the N middle resonance holes 109,110,111, respectively, and metal blocks 120,121,122,123,124,125,126 are formed between the first sub-frame region and the first resonance hole, between the second resonance hole and the second sub-frame region, between the penultimate resonance hole and the last sub-frame region, between the N middle resonance holes and the N middle sub-frame regions, respectively, that is, a metal block is surrounded on the open end side of each resonance hole, and a hollow-out region is formed on the outer side of the metal block.

One hollow-out area B116 extends to the open surface 101 in a U shape, two ends of the hollow-out area B are respectively connected with a first sub-frame area and a second sub-frame area of the hollow-out area A119, the other hollow-out area B117 extends to the open surface, and two ends of the hollow-out area B117 are respectively connected with a last sub-frame area and a penultimate sub-frame area of the hollow-out area A119 on the open surface;

one end of the input electrode 114 is arranged at one hollow-out region B116, and the other end of the input electrode extends to the metal layer on the open surface 101 to be connected, so that the input electrode connects a signal to the second resonant hole 108 and forms a plug-in zero point with the first resonant hole 107;

one end of the output electrode 115 is arranged at one hollow-out region B117, and the other end of the output electrode extends to the open surface 101 to be L-shaped and is connected with the metal layer on the open surface, so that the input electrode connects a signal to the penultimate resonant hole 112 and forms an external zero point with the penultimate resonant hole 113;

in some embodiments, the number of the resonance holes is seven, including a first resonance hole 107, a second resonance hole 108, a third resonance hole 109, a fourth resonance hole 110, a fifth resonance hole 111, a sixth resonance hole 111, and a seventh resonance hole 112, and first sub-frame regions, second sub-frame regions, third sub-frame regions, fourth sub-frame regions, penultimate sub-frame regions, and last sub-frame regions are formed around the first resonance hole 107, the second resonance hole 108, the third resonance hole 109, the fourth resonance hole 110, the fifth resonance hole 111, the sixth resonance hole 112, and the seventh resonance hole 113, respectively; specifically, a first metal segment 131, a second metal segment 127, a third metal segment 128, a fourth metal segment 130 and a fifth metal segment 132 are respectively formed between the first sub-frame region and the second sub-frame region, between the second sub-frame region and the third sub-frame region, between the third sub-frame region and the fourth sub-frame region, between the fifth sub-frame region and the penultimate sub-frame region, and between the penultimate sub-frame region and the last sub-frame region, so that the first resonance hole 107 and the second resonance hole 108, the second resonance hole 108 and the third resonance hole 109, the third resonance hole 109 and the fourth resonance hole 110, the fifth resonance hole 111 and the penultimate resonance hole 112, and the penultimate resonance hole 112 and the last resonance hole 113 form inductive coupling; a hollow section 129 is formed between the fourth sub-frame region and the fifth sub-frame region, so that the fourth resonance hole 110 and the fifth resonance hole 111 form capacitive coupling;

specifically, one end of the first metal segment 131, the second metal segment 127, the third metal segment 128, the fourth metal segment 130, and the fifth metal segment 132 is located in the hollow area a119 on the open surface 102, and the other end thereof is connected to the metal layer on the open surface 101.

The 7 resonant holes are arranged on the dielectric body in parallel at equal heights.

In this embodiment, as described above, an open end face pattern is formed on the open face 101, where the open end face pattern is formed by the hollow area a119 and a metal layer, the metal layer is formed by the first metal block 120, the second metal block 121, the N middle metal blocks 122,123,124, the penultimate metal block 125, the last metal block 126, the first metal edge 118, the second metal line 133, the third metal line 135, and the fourth metal line 134, and the first metal edge 118 is disposed at the junction of the open face 101 and the adjacent two sides 105,106, the top 104, and the bottom 103, and is electrically connected to the left side 105, the right side 106, the bottom 103, and the top 106, respectively; the second metal line segment 133 is arranged at the lower side of the open face corresponding to the first sub-frame area and the second sub-frame area, the third metal line segment 135 is arranged at the lower side of the open face corresponding to the N middle sub-frame areas, and the fourth metal line segment 134 is arranged at the lower side of the open face corresponding to the penultimate sub-frame area and the last sub-frame area;

a first metal block 120, a second metal block 121, N intermediate metal blocks 122,123,124, a second last metal block 125, and a last metal block 126 are formed on the peripheral sides of the first resonance hole 107, the second resonance hole 108, the N intermediate resonance holes 109,110,111, the second last resonance hole 112, and the last resonance hole 113, respectively;

it should be noted here that the "metal block" may be in any shape, such as rectangular and other arbitrary shapes; the "sidelines" include, but are not limited to, straight lines, broken lines, or curved lines; the "line segment" includes but is not limited to a straight line segment, a broken line segment or an arc line segment.

The first sub-frame area, the second sub-frame area, the N middle sub-frame areas, the penultimate sub-frame area, and the last sub-frame area are formed on the peripheral sides 126 of the first metal block 120, the second metal block 121, the N middle metal blocks 122,123,124, the penultimate metal block 125, and the last metal block, respectively.

In some embodiments, one of the hollow-out regions B116 is U-shaped, and both sides thereof extend to the open surface 101 respectively, and both ends thereof are connected to the first sub-frame region and the second sub-frame region on the open surface 101 respectively; one end of the input electrode 114 is arranged at the hollow-out region B, and the other end extends to the open surface 101 and is electrically connected with the second metal line segment 133 of the open surface 101, which is positioned at the lower side of the primary sub-frame region and the secondary sub-frame region;

the other hollow-out area B117 is U-shaped, two sides of the hollow-out area B extend to the open surface 101 respectively, and two ends of the hollow-out area B are connected with the last sub-frame area and the penultimate sub-frame area on the open surface 101 respectively; one end of the output electrode is disposed in the hollow-out region B117, and the other end extends to the open surface and is electrically connected to a fourth metal line segment 134 on the open surface, which is located at the bottom of the last sub-frame region and the second last sub-frame region.

In some embodiments, one end of the second metal segment 127, the third metal segment 128, and the fourth metal segment 130 is located in the hollow area a on the open surface, and the other end thereof is connected to the third metal segment 135 on the lower side of the open surface.

In some embodiments, the dielectric filter further comprises a metal shield.

The 7 resonance holes have the same diameter.

As shown IN fig. 5, which illustrates a circuit equivalent diagram of the dielectric filter, the input terminal IN represents the signal input electrode 114, the output terminal OUT represents the signal output electrode 115, the equivalent distance capacitance Cin between the first metal segment 131, the second metal segment 133 and the second metal block 121 of the second resonant hole 108, the equivalent distance capacitance Cout between the fifth metal segment 132, the fourth metal segment 134 and the second-to-last metal block 125 of the sixth resonant hole 112, and the equivalent metal blocks on the open surfaces of the resonant holes and the metal blocks around the resonant holes are resonators R1, R2, R3, R4, R5, R6 and R7 which are both capacitive and inductive.

The electric field formed by the hollow area between the second metal block 121 and the third metal block 122 and the electric field formed by the second metal segment 127 are equivalent to an inductor L1, the electric field formed by the hollow area between the third metal block 122 and the fourth metal block 123 and the electric field formed by the third metal segment 128 are equivalent to an inductor L2, the distance between the fourth metal block 123 and the fifth metal block 124 is equivalent to a capacitor C, and the electric field formed by the hollow area between the fifth metal block 124 and the sixth metal block 125 and the electric field formed by the fourth metal segment 130 are equivalent to an inductor L3.

The distances between the first metal segment 131, the second metal segment 133 and the first metal block 120 form a first attenuation pole N1 outside the high frequency band; the distance between the fifth metal segment 132, the fourth metal segment 134, and the fifth metal block 126 forms a second attenuation pole N2 outside the high frequency band.

Fig. 6 is a schematic diagram illustrating a forward transmission coefficient S21 measurement curve of a filter structure, and as shown in the figure, the positions of attenuation poles of the filter structure are different according to out-of-band rejection points, in addition to the frequency band selected by the design, based on the difference of the metal patterns of the filter structure. In the figure, N1 is the attenuation pole formed by the capacitive coupling between the first metal segment 131, the second metal segment 133 and the first metal block 120, and N2 is the attenuation pole formed by the capacitive coupling between the fifth metal segment 132, the fourth metal segment 134 and the fifth metal block 126.

The utility model discloses optimize the wave filter structural characteristic, the metal pattern is external on the open face of wave filter, and coupling capacitance and coupling inductance reach the wide band width that needs through adjusting the metal pattern to provide low insertion loss, two external attenuation poles in wave filter both ends improve the effect of near-end outband attenuation ratio.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific embodiment," "an alternative embodiment," "an example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (7)

1. An improved dielectric filter, comprising:

the dielectric body is provided with an open surface, a short circuit surface, a top surface, a bottom surface and two side surfaces, wherein a hollow area A is formed on the open surface, two hollow areas B are respectively arranged on the left side and the right side of the bottom surface, and the two hollow areas B respectively extend to the open surface;

n +4 through holes, wherein N is a natural number not less than 1, the through holes penetrate through the dielectric body at intervals from left to right, one end of each through hole is located on the open surface, the other end of each through hole is located on the short-circuit surface, the inner walls of the N +4 through holes are provided with metal layers to form N +4 resonant holes, and the N +4 resonant holes comprise a first resonant hole, a second resonant hole, N middle resonant holes, a penultimate resonant hole and a penultimate resonant hole which are sequentially arranged from left to right;

the grounding metal layer is arranged on the top surface, the bottom surface, the two side surfaces and the areas of the open surface and the short circuit surface outside the hollow area A and the hollow area B, wherein the grounding metal layer arranged on the short circuit surface is electrically connected with the metal layer on the inner wall of the through hole to form a short circuit end, and the resonant hole is electrically connected with the open surface to form an open end;

the hollow-out area A comprises a first sub-frame area surrounding a first resonance hole, a second sub-frame area surrounding a second resonance hole, a penultimate sub-frame area surrounding a penultimate resonance hole, a last sub-frame area surrounding the penultimate resonance hole and N middle sub-frame areas surrounding N middle resonance holes respectively, and metal blocks are formed between the first sub-frame area and the first resonance hole, between the second resonance hole and the second sub-frame area, between the penultimate resonance hole and the penultimate sub-frame area, between the N middle resonance holes and the N middle sub-frame areas respectively;

wherein, one hollow area B extends to the open surface and both ends thereof are respectively connected with the first sub-frame area and the second sub-frame area on the open surface, the other hollow area B extends to the open surface and both ends thereof are respectively connected with the sixth sub-frame area and the seventh sub-frame area on the open surface,

one end of the input electrode is arranged at one hollow-out area B, and the other end of the input electrode extends to the open surface to be L-shaped and is connected with the metal layer on the open surface, so that the input electrode is used for connecting a signal to the second resonance hole and simultaneously forms an external zero point with the first resonance hole;

and one end of the output electrode is arranged at one hollow-out area B, and the other end of the output electrode extends to the open surface to be L-shaped and is connected with the metal layer on the open surface, so that the input electrode is used for connecting a signal to the penultimate resonance hole and simultaneously forms an external zero point with the penultimate resonance hole.

2. The dielectric filter according to claim 1, wherein the number of the resonance holes is seven, including a first resonance hole, a second resonance hole, a third resonance hole, a fourth resonance hole, a fifth resonance hole, a sixth resonance hole, and a seventh resonance hole;

and a first sub-frame area, a second sub-frame area, a third sub-frame area, a fourth sub-frame area, a penultimate sub-frame area and a last sub-frame area are respectively formed around the first resonance hole, the second resonance hole, the third resonance hole, the fourth resonance hole, the fifth resonance hole, the sixth resonance hole and the seventh resonance hole.

3. The dielectric filter according to claim 2, wherein a first metal segment, a second metal segment, a third metal segment, a fourth metal segment and a fifth metal segment are respectively formed between the first sub-frame region and the second sub-frame region, between the second sub-frame region and the third sub-frame region, between the third sub-frame region and the fourth sub-frame region, between the fifth sub-frame region and the penultimate sub-frame region, between the penultimate sub-frame region and the last sub-frame region, so that inductive couplings are formed between the first resonant hole and the second resonant hole, between the second resonant hole and the third resonant hole, between the third resonant hole and the fourth resonant hole, between the fifth resonant hole and the penultimate resonant hole, and between the penultimate resonant hole and the last resonant hole; and a hollow section is formed between the fourth sub-frame area and the fifth sub-frame area, so that the fourth resonance hole and the fifth resonance hole form capacitive coupling.

4. The dielectric filter of claim 3, wherein one end of the first metal segment, the second metal segment, the third metal segment, the fourth metal segment and the fifth metal segment is in the hollow area A on the open surface, and the other end of the first metal segment, the second metal segment, the third metal segment, the fourth metal segment and the fifth metal segment is connected with the metal layer on the open surface.

5. The dielectric filter of claim 1, wherein the N +4 resonant holes are arranged in parallel at equal heights in the dielectric body.

6. The dielectric filter according to claim 1, wherein an open end face pattern is formed on the open face by a hollow area A and a metal layer,

the metal layer consists of a first metal block, a second metal block, N middle metal blocks, a penultimate metal block, a last metal block, a first metal sideline, a second metal line segment, a third metal line segment and a fourth metal line segment, wherein the first metal sideline is arranged at the joint of the open surface and the adjacent two sides, top surface and bottom surface of the open surface and is respectively connected with the left side, the right side, the bottom surface and the top surface; the second metal line segment is arranged at the lower side of the opening surface corresponding to the first sub-frame area and the second sub-frame area, the third metal line segment is arranged at the lower side of the opening surface corresponding to the N middle sub-frame areas, and the fourth metal line segment is arranged at the lower side of the opening surface corresponding to the penultimate sub-frame area and the last sub-frame area;

the first metal block, the second metal block, the N middle metal blocks, the penultimate metal block and the last metal block are respectively formed on the peripheral sides of the first resonance hole, the second resonance hole, the N middle resonance holes, the penultimate resonance hole and the last resonance hole;

the first sub-frame area, the second sub-frame area, the N middle sub-frame areas, the penultimate sub-frame area and the last sub-frame area are respectively formed on the peripheral sides of the first metal block, the second metal block, the N middle metal blocks, the penultimate metal block and the last metal block.

7. The dielectric filter of claim 1, wherein one of the hollow-out regions B is U-shaped, and both sides thereof extend to the open surface respectively and both ends thereof are connected to the first sub-frame region and the second sub-frame region on the open surface respectively; one end of the input electrode is arranged at the hollow-out area B, and the other end of the input electrode extends to the open face and is electrically connected with the second metal line segment of the open face.

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