CN101714683B - Dielectric filter with trap graphs and duplexer - Google Patents
Dielectric filter with trap graphs and duplexer Download PDFInfo
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- CN101714683B CN101714683B CN2009102522537A CN200910252253A CN101714683B CN 101714683 B CN101714683 B CN 101714683B CN 2009102522537 A CN2009102522537 A CN 2009102522537A CN 200910252253 A CN200910252253 A CN 200910252253A CN 101714683 B CN101714683 B CN 101714683B
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- 239000011248 coating agent Substances 0.000 claims description 74
- 238000000576 coating method Methods 0.000 claims description 74
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 229910010293 ceramic material Inorganic materials 0.000 claims description 7
- 230000005684 electric field Effects 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 3
- 239000004020 conductor Substances 0.000 description 8
- 239000002184 metal Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 5
- 229930006000 Sucrose Natural products 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 5
- 239000005720 sucrose Substances 0.000 description 5
- 230000001939 inductive effect Effects 0.000 description 3
- 230000008447 perception Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention relates to a dielectric filter with trap graphs and a duplexer. The dielectric filter and the duplexer comprise an extended conductive layer and an elongated conductive layer, wherein the extended conductive layer is positioned between two adjacent through holes on the upper surface and is connected with a conductive layer at the rear side, and an uncoated area is formed between the extended conductive layer and the two adjacent through holes; and the elongated conductive layer is positioned in the uncoated area under the two adjacent through holes of the upper surface, and the elongated conductive layer is vertical to the extended conductive layer. The elongated conductive layer and the uncoated area of the two adjacent through holes form equivalent capacitance in an electric field, and can form attenuation poles in the required low-frequency band and the high-frequency band so as to establish attenuation properties in the required low-frequency band and the high-frequency band, facilitate the design of the product and reduce the volume.
Description
Technical field
The present invention relates to a kind of dielectric filter and duplexer with trap graphs, be specifically related to a kind of dielectric filter and duplexer that not only can improve low-frequency band but also can improve the trap graphs of high frequency band attenuation characteristic.
Background technology
Dielectric filter has required the sideband of frequency band for decay.Usually, the medium block made by ceramic material of dielectric filter and a plurality of coaxial resonators that form in this medium block form.In dielectric filter, should require frequency band to have minimum insertion loss and the frequency band sideband has the minimal attenuation ratio.The traditional sucrose filter will realize that the good decay of frequency band sideband need to form in the dielectric filter two ends increase trap through hole and corresponding additional space, when the system equipment limited space of working medium filter, just can only lose the attenuation characteristic of frequency band sideband, can't both take into account.
Figure 1A to Fig. 1 C shows the traditional sucrose filter, and wherein Figure 1A shows profile and the structural representation of dielectric filter, and Figure 1B shows the equivalent circuit diagram of dielectric filter, and Fig. 1 C shows the typical frequencies propagation characteristic curve chart of dielectric filter.
Dielectric filter shown in Figure 1A comprises medium block, on this medium block, have upper surface, the lower surface parallel with upper surface and with upper surface four sides vertical with lower surface.In medium block, be formed with the first through hole 308, the second through hole 309, the 3rd through hole 310, the 4th through hole 311.
The lower surface of dielectric filter and four sides are coated with conductive coating, in the first through hole 308, the second through hole 309, the 3rd through hole 310 and the 4th through hole 311, be coated with conductive coating, the dielectric filter upper surface is coated with conductive coating at the peripheral part around four through holes, peripheral conductive layer 315 zones that upper surface is connected with four sides scribble conductive coating, between the second through hole 309 and the 3rd through hole 310, have a conductive coating that positive side is connected with the dorsal surface conductive coating, this conductive coating forms the inductive coupled district 320 of metal.Leading flank 303 in upper surface the first through hole 308 and the 4th through hole 311 correspondences arranges respectively conductive coating, thereby forms a signal input attenuator 318 and a signal output pad 319.
Around four through holes between conductive coating zone and peripheral conductive layer 315 zones without coating area 312 formation loading condenser figures.
Equivalent circuit Figure 1B of dielectric filter shown in Figure 1A.Input in Figure 1B (IN) and output (OUT) mean respectively signal input attenuator 318 and the signal output pad 319 in Figure 1A.Between the first through hole 308 in Figure 1A and the second through hole 309, be equivalent to the capacitor C 1 in Figure 1B without coating distance.Between the 3rd through hole 310 in Figure 1A and the 4th through hole 311, be equivalent to the capacitor C 2 in Figure 1B without coating distance.The inductive coupled district 320 of metal between the second through hole 309 and the 3rd through hole 310 is equivalent to the inductance L in Figure 1B.Fig. 1 C shows reflection loss S22 and transmission characteristic or the attenuation characteristic S32 of dielectric filter, at low frequency point C place, forms decay P1 and at high-frequency point D place, forms decay P2.
Along with the raising of the communication technology to the filter sideband attenuation, require filter, at passband sideband place, better decay is arranged.Yet above-mentioned traditional sucrose filter can't form respectively than P1 at sideband low frequency point C and high-frequency point D place, P2 better decays.While when filter, requiring to reach P1, P2 at curve point E, F frequency place when the AB passband width is constant, even decay when better, above-mentioned dielectric filter can't be realized especially.If reach above-mentioned requirements, two trap through holes need to be set again on above-mentioned traditional sucrose filter, in filter, through hole 201,202 is two trap through holes as shown in Figure 2, so just need to, for the trap through hole provides additional space, be unfavorable for the miniaturization of device and communication equipment thereof.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of dielectric filter with trap graphs, and this dielectric filter has better decay at passband sideband place, thereby is conducive to the design of product and can reduces volume.
For achieving the above object, the first technical scheme of the present invention's employing is:
A kind of dielectric filter with trap graphs, have a medium block consisted of ceramic material, this medium block has the trailing flank of the upper surface as open surface, the leading flank that is provided with signal input attenuator and signal output pad, coated conductive layer, the left surface of coated conductive layer, the right flank of coated conductive layer and the lower surface of coated conductive layer; Between the upper surface of this medium block and lower surface, be provided with row's through hole, the axis of described through hole is parallel to each other, arranged side by side, and each through hole coated inner wall conductive layer is with this structure resonator in a row; Periphery around each through hole on upper surface is coated with respectively a local conductive layer, every local conductive layer surrounding is without coating area, these connect mutually without coating area, its innovation is: be provided with at least one on without coating area and extend conductive layer described, every is extended conductive layer and all with the conductive layer of trailing flank, is connected, and extension conductive layer extend between a pair of adjacent through hole without in coating area; On without coating area, also be provided with an elongated conductive layer, this elongated conductive layer between leading flank and local conductive layer without coating area in, the center line of elongated conductive layer is vertical with the center line of described extension conductive layer.
Related content in technique scheme is explained as follows:
1, in such scheme, the left side of described upper surface, right side and posterior edges place are provided with peripheral conductive layer, and this periphery conductive layer is connected with the conductive layer on being coated on left surface, right flank and trailing flank.
2, in such scheme, described row's through hole number is four, i.e. the first through hole, the second through hole, the 3rd through hole and the 4th through hole, and described adjacent through hole is respectively the second through hole and the 3rd through hole.
3, in such scheme, described elongated conductive layer is corresponding without coating area between the first through hole and the second through hole from left to right, and the right side terminates between the 3rd through hole and the 4th through hole corresponding without coating area.
4, in such scheme, also comprise two trapped wave holes, this trapped wave hole structure is identical with described through hole, and one is positioned at the left side of a row as the through hole of resonator, and another is positioned at the right side of a row as the through hole of resonator.
For achieving the above object, the second technical scheme that the present invention adopts is:
A kind of dielectric duplexer with trap graphs, has an integral type medium block formed by ceramic material, this medium block has the upper surface as open surface, be provided with the signal input attenuator, the leading flank of signal output pad and antenna terminal, the trailing flank of coated conductive layer, the left surface of coated conductive layer, the right flank of coated conductive layer and the lower surface of coated conductive layer, between the upper surface of this medium block and lower surface, be provided with row's through hole, the axis of described through hole is parallel to each other, side by side, each through hole coated inner wall conductive layer is with this structure resonator in a row, periphery around each through hole on upper surface is coated with respectively a local conductive layer, every local conductive layer surrounding is without coating area, these connect mutually without coating area, its innovation is: at least two extend conductive layer lay respectively between at least two pairs of adjacent through holes of upper surface without in coating area, and be connected with the conductive layer of described trailing flank, this extends between conductive layer and described adjacent two through holes is without coating area, described at least two extension conductive layer parts are positioned on the upper surface on described antenna terminal right side, all the other extend conductive layers be positioned at described antenna terminal left side upper surface on, two elongated conductive layer between leading flank and local conductive layer without coating area in, an elongated conductive layer is positioned on the upper surface on described antenna terminal right side, another elongated conductive layer is positioned on the upper surface in described antenna terminal left side, and the center line of elongated conductive layer is vertical with the center line of described extension conductive layer.
1, in such scheme, the left side of described upper surface, right side and posterior edges place are provided with peripheral conductive layer, and this periphery conductive layer is connected with the conductive layer on being coated on left surface, right flank and trailing flank.
2, in such scheme, also comprise two trapped wave holes, this trapped wave hole structure is identical with described through hole, and one is positioned at the left side of a row as the through hole of resonator, and another is positioned at the right side of a row as the through hole of resonator.
Operation principle of the present invention and advantageous effect thereof: extend conductive layer between adjacent two through holes of upper surface, and be connected with the conductive layer of described trailing flank, this extends between conductive layer and described adjacent two through holes is without coating area; Elongated conductive layer be positioned at described upper surface adjacent two through holes below without coating area, this elongated conductive layer is vertical with described extension conductive layer.This elongated conductive layer and adjacent two through holes without coating area, form to form the equivalent capacity in electric field, can form attenuation pole in the low-frequency band required and high frequency band, thereby in desired low-frequency band and high frequency band, set up attenuation characteristic, thereby be conducive to the design of product and can reduce volume.
The accompanying drawing explanation
Accompanying drawing 1A is the stereogram of existing dielectric filter;
Accompanying drawing 1B is the equivalent circuit diagram of the dielectric filter shown in Figure 1A;
Accompanying drawing 1C is the typical frequencies propagation characteristic curve chart of the dielectric filter shown in Figure 1A;
Accompanying drawing 2 is existing stereogram with dielectric filter of low-frequency band and high frequency band trap attenuation characteristic;
Accompanying drawing 3A is the stereogram that the present invention has the dielectric filter of trap graphs;
Accompanying drawing 3B is the vertical view of the dielectric filter shown in accompanying drawing 3A;
Accompanying drawing 3C is the equivalent circuit diagram of the dielectric filter shown in accompanying drawing 3A;
Accompanying drawing 3D is the typical frequencies propagation characteristic curve chart of the dielectric filter shown in accompanying drawing 3A;
Accompanying drawing 3E is the transfer curve figure comparison diagram of accompanying drawing 3D and accompanying drawing 1C;
Accompanying drawing 3F is the transfer curve figure comparison diagram of trap graphs for a change;
Accompanying drawing 4 has the second embodiment stereogram of the dielectric filter of trap graphs for the present invention;
Accompanying drawing 5 has the dielectric duplexer of trap graphs for the present invention.
In above accompanying drawing: 201, the first trapped wave hole, 202, the second trapped wave hole, 301, medium block, 302, upper surface, 303, leading flank, 304, trailing flank, 305, left surface, 306, right flank, 307, lower surface, 308, the first through hole, 309, the second through hole, 310, the 3rd through hole, 311, the 4th through hole, 312, without coating area, 313, extend conductive layer, 314, elongated conductive layer, 315, the periphery conductive layer, 316, inner conducting layer, 317, local conductive layer, 318, the signal input attenuator, 319, the signal output pad, 320, the inductive coupled district of metal, 321, conductive layer, 401, first extends conductive layer, 402, second extends conductive layer, 403, the 3rd extends conductive layer, 404, the 5th through hole, 405, the 6th through hole, 406, the first attenuator extends conductive layer, 407, the second attenuator extends conductive layer, 408, the first elongated conductive layer, 409, the second elongated conductive layer, 501, antenna terminal.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
Embodiment mono-: a kind of dielectric filter with trap graphs
Shown in accompanying drawing 3A, a kind of dielectric filter with trap graphs, has an integral type medium block 301 formed by ceramic material, this medium block 301 has the trailing flank 304 of the upper surface 302 as open surface, the leading flank that is provided with signal input attenuator 318 and signal output pad 319, coated conductive layer, the left surface 305 of coated conductive layer, the right flank 306 of coated conductive layer and the lower surface 307 of coated conductive layer, and this coated conductive layer forms the external conductor as bucking electrode or grounding electrode.
Between the upper surface 302 of this medium block 301 and lower surface 307, be provided with the through hole 308,309,310,311 of a row as resonator, the axis of described through hole is parallel to each other, arranged side by side; On the inner surface of each through hole, be provided with the coat of metal and form inner conductor layer 316, around each through hole, be provided with local conductor layer 317 on upper surface, electric conducting material is coated to the peripheral inwall of through hole.Each through hole surrounding is without coating area 312.
Be provided with the leading flank 303 of signal input attenuator 318 and signal output pad 319, on leading flank 303, form adjacent with upper surface 302 without coating area 312, this without coating area 312 be connected to upper surface 302 without coating area, signal input attenuator 318 is positioned on the leading flank 303 corresponding with the first through hole 308 without coating area 312, signal input attenuator 318 is by being connected to signal input attenuator 318 as resonator the first through hole 308 without coating area 312 without coating area 312 and upper surface 302 of leading flank 303, in like manner, signal output pad 319 is set on the leading flank 303 corresponding with the 4th through hole 311 without in coating area 312, signal output pad 319 is connected to as resonator the 4th through hole 311 without coating area 312 without coating area 312 and upper surface by leading flank 303.
The left side of described upper surface 302, right side and posterior edges place are provided with peripheral conductive layer 315, and this periphery conductive layer 315 is connected with the conductive layer on being coated on left surface 305, right flank 306 and trailing flank 304.
Described row's through hole number is four, and described adjacent two through holes are respectively the second through hole 309 and the 3rd through hole 310.
One is extended conductive layer 313 between adjacent two through holes of upper surface 302, and is connected with the conductive layer of described trailing flank 304, forms metal perception layer, and this extends between conductive layer 313 and described adjacent two through holes is without coating area 312; Elongated conductive layer 314 be positioned at described upper surface 302 adjacent two through holes below without coating area 312, this elongated conductive layer 314 is vertical with described extension conductive layer 313.
Described elongated conductive layer 314 from left to right between the first through hole 308 and the second through hole 309 without coating area 312, the right side terminate between third through-hole 310 and fourth hole 311 without coating area 312.
Dielectric filter also can comprise two be positioned at described upper surface and with described through hole trapped wave hole in a straight line, this trapped wave hole structure is identical with described through hole, one is positioned at the left side of a described row as the through hole of resonator, and another is positioned at the right side of a described row as the left side of the through hole of resonator.
Fig. 3 C shows the equivalent circuit diagram of the dielectric filter shown in Fig. 3 A.IN end and OUT end mean respectively signal input attenuator 318 and signal output pad 319.By the distance between signal input attenuator 318 and the first through hole 308, be equivalent to capacitor Cin, and the distance between signal output pad 319 and the 4th through hole 311 is equivalent to capacitor Cout.The length through-hole diameter of each through hole 308,309,310,311 and be equivalent to resonator DR1, DR2, DR3, the DR4 of not only having perception but also having capacitive around the local conductive layer 317 of each through hole, be connected with each node N1, N2, N3, N4 on Fig. 3 c respectively.
The equivalent capacity C1 without coating area 312 formation electric fields between the local conductive layer of the local conductive layer of the first through hole 308 and the second through hole 309, the equivalent capacity C2 without coating area 312 formation electric fields between the local conductive layer of the local conductive layer 317 of the 3rd through hole 310 and the 4th through hole 311.Between the local conductive layer of the local conductive layer of the second through hole 309 and the 3rd through hole 310 without coating area 312 and between local conductive layer 317 form the equivalent inductance L of electric fields.
Elongated conductive layer 314 forms trap graphs, forming the equivalent trap capacitor C N of electric field and being connected between node N1 and N2 without coating area 312 distances between the local conductive layer 317 of elongated conductive layer 314 and the second through hole 309, the local conductive layer 317 of the 3rd through hole 310.
With reference to figure 3D, form the equivalent capacity CN of the electric field of formation between the local conductive layer 317 of local conductive layer 318, the 3rd through hole 310 peripheries of trap graphs and the second through hole periphery according to elongated conductive layer 314, in lower sideband and high frequency sideband, form attenuation pole C, D respectively, according to the attenuation pole existed, at lower sideband position C, forming pad value is NP1, and at high frequency sideband position D, forming pad value is NP2.
As accompanying drawing 3E, the decay that the transfer curve that can obviously find out the dielectric filter built according to the utility model principle from the curve comparison on figure forms at lower sideband C and high frequency sideband D is significantly better than the traditional sucrose filter.
The distance B 1 of local conductive layer 317 that as accompanying drawing 3B and 3E as mentioned above, can be by changing trap graphs and the second through hole 309 peripheries, the local conductive layer 317 of the 3rd through hole 310 peripheries or the length D2 of change trap graphs 314 realize the movement of attenuation pole.
Shown in accompanying drawing 3F, shown when the length D2 of elongated conductive layer 314 formation trap graphs and the length D2 that elongated conductive layer 314 forms trap graphs shorten that characteristic curve relatively.The trap limit is transferred to C2, D2 by C1, D1 respectively.
The present embodiment testing equipment is the network analyzer of Agilent company, and model is AGILENT-15071B.
Embodiment bis-: a kind of dielectric filter with trap graphs
Shown in accompanying drawing 4, a kind of dielectric filter with trap graphs, has an integral type medium block 301 formed by ceramic material, this medium block has the trailing flank 304 of the upper surface 302 as open surface, the leading flank that is provided with signal input attenuator 318 and signal output pad 319, coated conductive layer, the left surface 305 of coated conductive layer, the right flank 306 of coated conductive layer and the lower surface 307 of coated conductive layer, and this coated conductive layer forms the external conductor as bucking electrode or grounding electrode.
Between the upper surface 302 of this medium block and lower surface 307, be provided with the through hole of a row as resonator, the axis of described through hole is parallel to each other, arranged side by side; On the inner surface of each through hole, be provided with the coat of metal and form inner conductor layer 316, around each through hole, be provided with local conductor layer 317 on upper surface, electric conducting material is coated to the peripheral inwall of through hole.Each through hole surrounding is without coating area 312.
Be provided with the leading flank of signal input attenuator 318 and signal output pad 319, on leading flank 303, form adjacent with upper surface 302 without coating area 312, this without coating area 312 be connected to upper surface 302 without coating area, signal input attenuator 318 is positioned on the leading flank 303 corresponding with the first through hole 308 without coating area 312, signal input attenuator 318 is connected to first through hole resonator 308 without coating area 312 by signal input attenuator 318 without coating area 312 and upper surface 302 by leading flank 303, in like manner, signal output pad 319 is set on the leading flank 303 corresponding with the 4th through hole 311 without in coating area 312b, by leading flank 303, without coating area 312, signal output pad 319 is connected to fourth hole resonator 311 without coating area 312 and upper surface.Upper surface 302 is provided with the first attenuator be connected with signal input attenuator 318 and extends conductive layer 406, and surface 302 is provided with the second attenuator extension conductive layer 407 be connected with signal output pad 319 simultaneously.
The left side of described upper surface 302, right side and posterior edges place are provided with peripheral conductive layer 315, and this periphery conductive layer 315 is connected with the conductive layer on being coated on left surface 305, right flank 306 and trailing flank 304.
Described row's through hole number is six, has three pairs of adjacent two through holes to be respectively the 5th through hole 404 and the first through hole 308, is the second through hole 309 and the 3rd through hole 310, is the 4th through hole 311 and the 6th through hole 405.
This dielectric filter comprises that three are extended conductive layer, first extend conductive layer 401 between upper surface 302 the 5th through hole 404 and the first through hole 308 without coating area, and be connected with the conductive layer of described trailing flank 304, form metal perception layer, this extends between conductive layer 401 and described adjacent two through holes is without coating area 312; In like manner, second extend conductive layer 402 between upper surface 302 second through holes 309 and the 3rd through hole 310 without coating area; The 3rd extend conductive layer 403 between upper surface 302 the 4th through hole 311 and the 6th through hole 405 without coating area.The second elongated conductive layer 408 be positioned at described upper surface 302 through hole below without coating area 312, this second elongated conductive layer 408 is vertical with described three extension conductive layers 401,402,403.
Dielectric filter also can comprise two be positioned at described upper surface 302 and with described through hole trapped wave hole in a straight line i.e. the first trapped wave hole 201, the first trapped wave hole 202, this trapped wave hole structure is identical with described through hole, one is positioned at the left side of a described row as the through hole of resonator, and another is positioned at the right side of a described row as the left side of the through hole of resonator.
Embodiment tri-: a kind of dielectric duplexer with trap graphs
As shown in Figure 5, a kind of dielectric duplexer with trap graphs, have an integral type medium block consisted of ceramic material, this medium block has the trailing flank 304 of the upper surface 302 as open surface, the leading flank that is provided with signal input attenuator 318, signal output pad 319 and antenna terminal 501, coated conductive layer, the left surface 305 of coated conductive layer, the right flank 306 of coated conductive layer and the lower surface 307 of coated conductive layer.
The left side of described upper surface 302, right side and posterior edges place are provided with peripheral conductive layer, and this periphery conductive layer is connected with the conductive layer on being coated on left surface, right flank and trailing flank 304.
Between the upper surface 302 of this medium block and lower surface 307, be provided with the through hole of a row as resonator, described row's through hole number is seven, and the axis of described through hole is parallel to each other, arranged side by side; Each through hole surrounding is without coating area 312, three extend conductive layer lay respectively between three pairs of adjacent through holes of upper surface without coating area, and be connected with the conductive layer of described trailing flank 304, this extends between conductive layer and described adjacent two through holes is without coating area, described three are extended left side that is positioned at described antenna terminal 501 of conductive layer, and all the other two are extended the right side that conductive layer is positioned at described antenna terminal 501; Two elongated conductive layer between row's through hole of described upper surface 302 and described leading flank 303 without coating area in, an elongated conductive layer 409 is positioned at the right side of described antenna terminal 501, another elongated conductive layer 408 is positioned at the left side of described antenna terminal 501, and two elongated conductive layer are all vertical with described extension conductive layer.
Also comprise that upper surface 302 is provided with the first attenuator be connected with signal input attenuator 318 and extends conductive layer 406, surface 302 is provided with the second attenuator extension conductive layer 407 be connected with signal output pad 319 simultaneously.
Two be positioned at described upper surface and with described through hole trapped wave hole in a straight line, this trapped wave hole structure is identical with described through hole, one is positioned at the left side of a described row as the through hole of resonator, and another is positioned at the right side of a described row as the left side of the through hole of resonator.
Above-described embodiment only is explanation technical conceive of the present invention and characteristics, and its purpose is to allow the person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (2)
1. dielectric filter with trap graphs, have a medium block consisted of ceramic material (301), this medium block (301) has the trailing flank (304) of the upper surface (302) as open surface, the leading flank (303) that is provided with signal input attenuator (318) and signal output pad (319), coated conductive layer, the left surface (305) of coated conductive layer, the right flank (306) of coated conductive layer and the lower surface (307) of coated conductive layer; Between the upper surface (302) of this medium block (301) and lower surface (307), be provided with row's through hole, the axis of described through hole is parallel to each other, arranged side by side, and each through hole coated inner wall conductive layer is with this structure resonator in a row; At the upper periphery around each through hole of upper surface (302), be coated with respectively a local conductive layer (317), every local conductive layer (317) surrounding is without coating area (312), these connect mutually without coating area (312), it is characterized in that: be provided with at least one on without coating area (312) and extend conductive layer (313) described, every is extended conductive layer (313) and all with the conductive layer of trailing flank (304), is connected, and an extension conductive layer (313) extend between a pair of adjacent through hole without in coating area (312); On without coating area (312), also be provided with an elongated conductive layer (314), this elongated conductive layer (314) be positioned between leading flank (303) and local conductive layer (317) without coating area (312), the center line of elongated conductive layer (314) is vertical with the center line of described extension conductive layer (313); Described row's through hole number is four, namely be followed successively by from left to right the first through hole (308), the second through hole (309), the 3rd through hole (310) and the 4th through hole (311), described adjacent through hole is respectively the second through hole (309) and the 3rd through hole (310); Described elongated conductive layer (314) is corresponding without coating area (312) between the first through hole (308) and the second through hole (309) from left to right, and the right side terminates between the 3rd through hole (310) and the 4th through hole (311) corresponding without coating area (312).
2. dielectric filter according to claim 1, it is characterized in that: the left side of described upper surface (302), right side and posterior edges place are provided with peripheral conductive layer (315), and this periphery conductive layer (315) is connected with the conductive layer on being coated on left surface, right flank and trailing flank.
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| CN101908666A (en) * | 2010-07-27 | 2010-12-08 | 苏州艾福电子通讯有限公司 | Dielectric filter for improving secondary harmonic waves |
| WO2016060151A1 (en) * | 2014-10-16 | 2016-04-21 | 株式会社村田製作所 | Radio frequency module |
| WO2016205307A1 (en) * | 2015-06-17 | 2016-12-22 | Cts Corporation | Multi-band rf monoblock filter |
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| WO2001011711A1 (en) * | 1999-08-06 | 2001-02-15 | Ube Electronics, Ltd. | Dielectric filter with a transmission line |
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