CN214625335U - Dielectric filter - Google Patents

Abstract

An object of the utility model is to provide a satisfying under the circumstances of passband minimum rejection ratio, reduce the volume of product, solve the dielectric filter of the too big problem of dielectric block volume, this dielectric filter includes the dielectric body, eight perforating holes of setting on the dielectric body, the metal level, input and output electrode, optimize filter structural characteristic, the volume of dielectric block has been reduced, the metal pattern is external on the open face of filter, it is wide to go up coupling capacitance and coupling inductance and reach the wide band that needs through the adjustment metal pattern, two external zeros in filter both ends, improve the effect of near-end outband attenuation ratio.

Description

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. Dielectric filters require a minimum insertion loss in the pass band and a minimum attenuation ratio outside the pass band. When a communication system is designed on a device, the device is required to be smaller and smaller, and when the volume of a dielectric block is reduced, if the pattern design on the surface of a filter is unreasonable, the characteristic of the filter is influenced, and the quality of a communication signal is further influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a satisfying under the circumstances of passband minimum suppression ratio, reducing the volume of product, solving the dielectric filter of the too big problem of dielectric block volume, 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;

eight through holes which penetrate through the dielectric body at intervals from left to right, wherein one end of each through hole is positioned on the open surface, the other end of each through hole is positioned on the short-circuit surface, metal layers are arranged on the inner walls of the eight through holes to form eight resonance holes, and the eight resonance holes comprise a first resonance hole, a second resonance hole, a third resonance hole, a fourth resonance hole, a fifth resonance hole, a sixth resonance hole, a seventh resonance hole and an eighth resonance hole which are sequentially arranged from left to right;

the metal layer is arranged on the top surface, the bottom surface, the two side surfaces and the short circuit surface in the area outside the hollow-out area A and the hollow-out area B, wherein the 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;

an open end face pattern formed by the hollow area A and the metal layer is formed on the open face, wherein the metal layer arranged on the open face comprises a first metal block arranged around the first resonance hole, a second metal block arranged around the second resonance hole, a third metal block arranged around the third resonance hole, a fourth metal block arranged around the fourth resonance hole, a fifth metal block arranged around the fifth resonance hole, a sixth metal block arranged around the sixth resonance hole, a seventh metal block arranged around the seventh resonance hole, an eighth metal block arranged around the eighth resonance hole, a first metal line segment, a second metal line segment and a third metal line segment; the first metal wire section is arranged on the lower side of the opening surface corresponding to the second resonance hole, the second metal wire section is arranged on the lower side of the opening surface corresponding to the seventh resonance hole, and the third metal wire section is arranged on the lower side of the opening surface corresponding to the third resonance hole to the sixth resonance hole;

the hollow area A comprises a first sub-frame area surrounding the outer side of the first metal block, a second sub-frame area surrounding the outer side of the second metal block, a third sub-frame area surrounding the outer side of the third metal block, a fourth sub-frame area surrounding the outer side of the fourth metal block, a fifth sub-frame area surrounding the outer side of the fifth metal block, a sixth sub-frame area surrounding the outer side of the sixth metal block, a seventh sub-frame area surrounding the outer side of the seventh metal block and an eighth sub-frame area surrounding the outer side of the eighth metal block;

a first metal straight-line segment, a second metal straight-line segment, a third metal straight-line segment, a fourth metal straight-line segment, a fifth metal straight-line segment and a sixth metal straight-line 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 sixth sub-frame region, between the sixth sub-frame region and the seventh sub-frame region, and between the seventh sub-frame region and the eighth sub-frame region; one end of the first metal straight line segment is positioned in the hollow area A, and the other end of the first metal straight line segment is connected with the first metal line segment; one end of the sixth metal straight line segment is positioned in the hollow area A, and the other end of the sixth metal straight line segment is connected with the second metal line segment; one end of the second metal straight line segment, one end of the third metal straight line segment, one end of the fourth metal straight line segment and one end of the fifth metal straight line segment are positioned in the hollow area A, and the other ends of the second metal straight line segment, the third metal straight line segment, the fourth metal straight line segment and the fifth metal straight line segment are connected with the third metal straight line segment;

one hollow area B extends to the open surface, and two ends of the hollow area B 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 two ends of the hollow area B are respectively connected with the seventh sub-frame area and the eighth 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 and is connected with the first metal line segment;

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 and is connected with the second metal line segment.

In some embodiments, a hollow spacer is disposed between the fourth sub-frame region and the fifth sub-frame region.

In some embodiments, the upper sides of the first sub-frame area, the second sub-frame area, the third sub-frame area, the fourth sub-frame area, the fifth sub-frame area, the sixth sub-frame area, the seventh sub-frame area and the eighth sub-frame area extend to the junction of the open surface and the top surface;

the lower sides of the first sub-frame area and the second sub-frame area extend to the joint of the open surface and the bottom surface so that the first sub-frame area and the second sub-frame area can be connected with one hollow area B; the lower sides of the seventh sub-frame area and the eighth sub-frame area extend to the joint of the open surface and the bottom surface so that the seventh sub-frame area and the eighth sub-frame area can be connected with the other hollow-out area B;

the first metal line segment is formed between the first sub-frame area and the second sub-frame area; the second metal line segment is formed between the seventh sub-frame area and the eighth sub-frame area.

In some embodiments, the open surface forms metal borderlines on left and right sides of the first and eighth sub-frame regions, respectively.

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

The utility model discloses optimize the wave filter structural characteristic, reduced the volume of dielectric block, 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, and the wave filter both ends are external two zeros, improve the effect of near-end outband attenuation ratio.

Drawings

Fig. 1-3 are schematic structural diagrams of the dielectric filter provided by the present invention;

fig. 4 is a circuit equivalent diagram of the dielectric filter provided by the present invention;

fig. 5 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. 1-3, the present invention provides a dielectric filter, which includes a dielectric body 200, eight through holes disposed on the dielectric body 200, a metal layer, and input and output electrodes;

the dielectric body 200 is an integral dielectric block made of a ceramic material, and has an open surface 201, a short-circuit surface 202, a top surface 204, a bottom surface 203 and two side surfaces 205,206, wherein a hollow area a219 is formed on the open surface 201, two hollow areas B217, 218 are respectively arranged on the left and right sides of the bottom surface 203, and the two hollow areas B217, 218 respectively extend to the open surface 201;

eight through holes are arranged through the dielectric body at intervals from left to right, one end of each through hole is positioned on the open surface 201, the other end of each through hole is positioned on the short-circuit surface 202, metal layers are arranged on the inner walls of the eight through holes to form eight resonant holes 207, 208, 209, 210, 211, 212, 213 and 214, and the eight resonant holes comprise a first resonant hole 207, a second resonant hole 208, a third resonant hole 209, a fourth resonant hole 210, a fifth resonant hole 211, a sixth resonant hole 212, a seventh resonant hole 213 and an eighth resonant hole 214 which are sequentially arranged on the dielectric body from left to right;

the top surface 204, the bottom surface 203, the two side surfaces 205,206 and the short-circuit surface 202 of the dielectric body 200 are provided with metal layers in the areas except the hollow-out area a219 and the hollow-out areas B217, 218, wherein the metal layers arranged on the short-circuit surface 202 are electrically connected with the metal layers on the inner walls of the through holes to form a short-circuit end, and the through holes are electrically connected with the open surface 201 to form an open end;

an open end face pattern formed by a hollow area a219 and a metal layer is formed on the open face 201, wherein the metal layer on the open face includes a first metal block 220 disposed around the first resonance hole 207, a second metal block 221 disposed around the second resonance hole 208, a third metal block 222 disposed around the third resonance hole 209, a fourth metal block 223 disposed around the fourth resonance hole 210, a fifth metal block 224 disposed around the fifth resonance hole 211, a sixth metal block 225 disposed around the sixth resonance hole 212, a seventh metal block 226 disposed around the seventh resonance hole 213, an eighth metal block 227 disposed around the eighth resonance hole 214, a first metal line segment 233, a second metal line segment 234, and a third metal line segment 240; the first wire segment 233 is disposed on the lower side of the open surface corresponding to the second resonance hole 208, the second wire segment 234 is disposed on the lower side of the open surface corresponding to the seventh resonance hole 213, and the third wire segment 240 is disposed on the lower side of the open surface 201 corresponding to the third to sixth resonance holes 209 to 212;

the hollow-out area a comprises a first sub-frame area surrounding the outer side of the first metal block 220, a second sub-frame area surrounding the outer side of the second metal block 221, a third sub-frame area surrounding the outer side of the third metal block 222, a fourth sub-frame area surrounding the outer side of the fourth metal block 223, a fifth sub-frame area surrounding the outer side of the fifth metal block 224, a sixth sub-frame area surrounding the outer side of the sixth metal block 225, a seventh sub-frame area surrounding the outer side of the seventh metal block 226, and an eighth sub-frame area surrounding the outer side of the eighth metal block 227;

a first metal straight line segment 236, a second metal straight line segment 228, a third metal straight line segment 229, a fourth metal straight line segment 231, a fifth metal straight line segment 232 and a sixth metal straight line segment 237 are respectively formed between the first sub-frame region and the second sub-frame region, the second sub-frame region and the third sub-frame region, the third sub-frame region and the fourth sub-frame region, the fifth sub-frame region and the sixth sub-frame region, the sixth sub-frame region and the seventh sub-frame region, and the seventh sub-frame region and the eighth sub-frame region; one end of the first metal straight line segment 236 is located in the hollow area a219, and the other end is connected with the first metal line segment 233; one end of the sixth metal straight line segment 237 is located in the hollow area a, and the other end of the sixth metal straight line segment is connected with the second metal line segment 234; one end of the second metal straight line segment 228, the third metal straight line segment 229, the fourth metal straight line segment 231 and the fifth metal straight line segment 232 is located in the hollow area a219, and the other end of the second metal straight line segment is connected with the third metal straight line segment 240;

one hollow-out area B217 extends to the open surface 201, and both ends of the hollow-out area B are respectively connected with the first sub-frame area and the second sub-frame area on the open surface 201, the other hollow-out area B218 extends to the open surface, and both ends of the hollow-out area B are respectively connected with the seventh sub-frame area and the eighth sub-frame area on the open surface,

an input electrode 215, one end of which is disposed at one of the hollow areas B217, and the other end of which extends to the open surface and is connected to the first metal line segment 233; the output electrode 216 has one end disposed in one of the hollow areas B218, and the other end extending to the open surface 201 and connected to the second metal line segment 234.

The input electrode 215 is positioned in a hollow area B217 on the bottom surface 203 corresponding to the second resonant hole 208, and the signal input electrode 215 connects a signal to the second resonant hole 208 serving as a resonator through the hollow area B217 on the surface 203 and the hollow area A219 on the open surface 201; similarly, the signal output electrode 216 passes through the hollow area B218 on the bottom surface 203 corresponding to the seventh resonant hole 226, so that the signal output electrode 216 connects the signal to the seventh resonant hole 226 as the same resonator through the hollow area B218 on the bottom surface 203 and the hollow area a219 on the open surface 201.

Under the condition of the same resonant hole, the frequencies of two zero points are higher and far higher than the required frequency, and the insertion loss of two sides is larger, so that the aperture of the resonant holes 207 and 214 on two sides is reduced, the frequencies of the resonant holes 207 and 214 as the zero points are in proper positions, and the function of high inhibition is achieved at the high end; the holes 208 and 213 are enlarged to increase the hole diameter, and the frequencies of the resonance holes 208 and 214 are increased, so that the insertion loss on the two sides is improved, and the effect of reducing the insertion loss is achieved.

In some embodiments, a hollow spacer 230 is disposed between the fourth sub-frame region and the fifth sub-frame region.

In some embodiments, the upper sides of the first sub-frame region, the second sub-frame region, the third sub-frame region, the fourth sub-frame region, the fifth sub-frame region, the sixth sub-frame region, the seventh sub-frame region, and the eighth sub-frame region extend to the junction of the open surface 201 and the top surface 204;

the lower sides of the first sub-frame area and the second sub-frame area extend to the joint of the open surface 201 and the bottom surface 203 so that the two sub-frame areas can be connected with one hollow area B; the lower sides of the seventh sub-frame area and the eighth sub-frame area extend to the joint of the open surface and the bottom surface so that the seventh sub-frame area and the eighth sub-frame area can be connected with the other hollow-out area B;

the first metal line segment 232 is formed between the first sub-frame region and the second sub-frame region; the second metal line segment 234 is formed between the seventh sub-frame region and the eighth sub-frame region.

In some embodiments, the open surface 201 forms metal borders 238,239 on the left and right sides of the first and eighth sub-frame regions, respectively.

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

Fig. 4 shows a circuit equivalent diagram of the dielectric filter, where the input terminal IN represents the signal input electrode 215, the output terminal OUT represents the signal output electrode 216, the second resonance hole 208 serves as the first resonator R2, the distance equivalent capacitance Cin between the signal input electrode 215 and the first resonator R2, and the distance from the first resonance hole R1 forms the first attenuation pole N1 outside the high-frequency band, the third resonance hole serves as the second resonator R3, the distance equivalent inductance L1 between the first resonator R2 and the second resonator R3, the fourth resonance hole serves as the third resonator R4, the distance equivalent inductance L2 between the second resonator R3 and the third resonator R4, the fifth resonance hole serves as the fourth resonator R5, the distance equivalent capacitance C between the third resonator R4 and the fourth resonator R5, the sixth resonance hole serves as the fifth resonator R6, the distance equivalent inductance L3 between the fourth resonator R5 and the fifth resonator R6, the seventh resonant hole is used as the sixth resonator R7, the distance between the fifth resonator R6 and the sixth resonator R7 is equivalent to the inductance L4, the distance between the signal output electrode 216 and the sixth resonator R7 is equivalent to the capacitance Cout, and the distance from the eighth resonant hole R8 forms a second attenuation pole N2 outside the low-frequency side band.

Fig. 5 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 drawing, N1 is a distance equivalent capacitance Cin between the sign input electrode 215 and the first resonator R2, and a distance from the first resonance hole R1 forms a first attenuation pole N1 outside the high frequency band, N2 is a distance equivalent capacitance Cout between the signal output electrode 216 and the sixth resonator R7, and a distance from the eighth resonance hole R8 forms a second attenuation pole N2 outside the low frequency band.

The utility model discloses optimize the wave filter structural characteristic, reduced the volume of dielectric block, 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, and the wave filter both ends are external two zeros, 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 (5)

1. A 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;

eight through holes which penetrate through the dielectric body at intervals from left to right, wherein one end of each through hole is positioned on the open surface, the other end of each through hole is positioned on the short-circuit surface, metal layers are arranged on the inner walls of the eight through holes to form eight resonance holes, and the eight resonance holes comprise a first resonance hole, a second resonance hole, a third resonance hole, a fourth resonance hole, a fifth resonance hole, a sixth resonance hole, a seventh resonance hole and an eighth resonance hole which are sequentially arranged from left to right;

the metal layer is arranged on the top surface, the bottom surface, the two side surfaces and the short circuit surface in the area outside the hollow-out area A and the hollow-out area B, wherein the 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;

an open end face pattern formed by the hollow area A and the metal layer is formed on the open face, wherein the metal layer arranged on the open face comprises a first metal block arranged around the first resonance hole, a second metal block arranged around the second resonance hole, a third metal block arranged around the third resonance hole, a fourth metal block arranged around the fourth resonance hole, a fifth metal block arranged around the fifth resonance hole, a sixth metal block arranged around the sixth resonance hole, a seventh metal block arranged around the seventh resonance hole, an eighth metal block arranged around the eighth resonance hole, a first metal line segment, a second metal line segment and a third metal line segment; the first metal wire section is arranged on the lower side of the opening surface corresponding to the second resonance hole, the second metal wire section is arranged on the lower side of the opening surface corresponding to the seventh resonance hole, and the third metal wire section is arranged on the lower side of the opening surface corresponding to the third resonance hole to the sixth resonance hole;

the hollow area A comprises a first sub-frame area surrounding the outer side of the first metal block, a second sub-frame area surrounding the outer side of the second metal block, a third sub-frame area surrounding the outer side of the third metal block, a fourth sub-frame area surrounding the outer side of the fourth metal block, a fifth sub-frame area surrounding the outer side of the fifth metal block, a sixth sub-frame area surrounding the outer side of the sixth metal block, a seventh sub-frame area surrounding the outer side of the seventh metal block and an eighth sub-frame area surrounding the outer side of the eighth metal block;

a first metal straight-line segment, a second metal straight-line segment, a third metal straight-line segment, a fourth metal straight-line segment, a fifth metal straight-line segment and a sixth metal straight-line 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 sixth sub-frame region, between the sixth sub-frame region and the seventh sub-frame region, and between the seventh sub-frame region and the eighth sub-frame region; one end of the first metal straight line segment is positioned in the hollow area A, and the other end of the first metal straight line segment is connected with the first metal line segment; one end of the sixth metal straight line segment is positioned in the hollow area A, and the other end of the sixth metal straight line segment is connected with the second metal line segment; one end of the second metal straight line segment, one end of the third metal straight line segment, one end of the fourth metal straight line segment and one end of the fifth metal straight line segment are positioned in the hollow area A, and the other ends of the second metal straight line segment, the third metal straight line segment, the fourth metal straight line segment and the fifth metal straight line segment are connected with the third metal straight line segment;

one hollow area B extends to the open surface, and two ends of the hollow area B 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 two ends of the hollow area B are respectively connected with the seventh sub-frame area and the eighth 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 and is connected with the first metal line segment;

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 and is connected with the second metal line segment.

2. The dielectric filter of claim 1, wherein a hollow spacer is disposed between the fourth sub-frame region and the fifth sub-frame region.

3. The dielectric filter of claim 1, wherein the upper sides of the first sub-frame region, the second sub-frame region, the third sub-frame region, the fourth sub-frame region, the fifth sub-frame region, the sixth sub-frame region, the seventh sub-frame region and the eighth sub-frame region extend to the junction of the open surface and the top surface;

the lower sides of the first sub-frame area and the second sub-frame area extend to the joint of the open surface and the bottom surface so that the first sub-frame area and the second sub-frame area can be connected with one hollow area B; the lower sides of the seventh sub-frame area and the eighth sub-frame area extend to the joint of the open surface and the bottom surface so that the seventh sub-frame area and the eighth sub-frame area can be connected with the other hollow-out area B;

the first metal line segment is formed between the first sub-frame area and the second sub-frame area; the second metal line segment is formed between the seventh sub-frame area and the eighth sub-frame area.

4. The dielectric filter of claim 1, wherein the open surface forms metal borders on left and right sides of the first and eighth sub-frame regions, respectively.

5. The dielectric filter of claim 1, further comprising a metal shield.

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