CN107959094A - filter with improved structure - Google Patents

Abstract

The invention discloses a filter with an improved structure, which comprises: a substrate, a plurality of resonant metal layers, a grounding metal layer, a metal pattern layer, an input electrode and an output electrode. The substrate is provided with a plurality of resonance holes, one end of each resonance hole is positioned on the open surface of the substrate, and the other end of each resonance hole is positioned on the short circuit surface. The plurality of resonant metal layers are arranged in the plurality of resonant holes. The grounding metal layer is arranged on the short circuit surface, the top surface, the bottom surface and the two side surfaces of the substrate and is electrically connected with the plurality of resonant metal layers to form a short circuit end; the input electrode and the output electrode are arranged on the bottom surface or the open surface of the substrate and are not electrically connected with the grounding metal layer. The filter with the improved structure provided by the invention is characterized in that the metal pattern layer, the plurality of resonant metal layers and the grounding metal layer form a mutual coupling filter so as to adjust the length of the resonant metal layers and the metal pattern layer to achieve the required use frequency band.

Description

Structurally Improved Filters

technical field

This invention relates to a filter, and more particularly to an improved filter having a surface-mounted structure that alters the frequency response.

Background technique

It is known that surface mount filters have been widely used in wave collectors (LNB), satellite navigation systems (GPS) and WIFI systems. The filter used in this wireless communication system is to filter out the noise contained in the signal received by the wireless communication system, so as to ensure the quality of signal transmission and reception in the communication system.

The currently used filter has a carrier with a plurality of resonant holes penetrating the carrier, one end of the plurality of resonant holes is located on the open surface, the other end is on the short-circuit surface, on the short-circuit surface of the carrier, The top surface, the bottom surface and the two side surfaces are covered with an outer conductive layer to form the ground of the filter. Inner conductive layers are coated in the plurality of resonant holes to form a resonator, and the plurality of inner conductive layers are electrically connected to the outer conductive layer to form a short circuit end, and the resonant holes located on the open surface form an open end. An input welding pad and an output welding pad are made on the bottom surface, and a gap is formed between the input welding pad and the output welding pad and the outer conductive layer. When the filter is welded on the circuit board, the input welding pad and the output welding pad The pads provide signal input and output, and the outer conductive layer on the bottom surface is connected to the ground of the circuit board.

The design of the approved pattern on the surface of the filter mentioned above will be different due to the application in different communication systems, and if the pattern on the surface of the filter is not properly designed, it will also affect the characteristics of the filter.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a filter with improved structure and improve the characteristics of the filter structure. Therefore, the present invention arranges the metal pattern layer on the open surface to increase the overall coupling capacitance of the filter structure to achieve the desired The required frequency band is also provided with functions such as low insertion loss and out-band rejection.

Another object of the present invention is to provide a filter with improved structure. The single resonant hole on the filter is composed of two holes of different shapes, which can reduce the size of the filter, increase the Q value of the filter structure, and suppress Spurious response.

Another object of the present invention is to provide a filter with improved structure. A single resonant hole on the filter is composed of two different hole shapes, and the depths of the two hole shapes are not equal, so that the performance of the filter structure can be adjusted. As well as improving the frequency response of the filter structure.

For reaching above-mentioned purpose, the present invention provides a kind of structurally improved filter, comprises:

A substrate with an open surface, a short-circuit surface, a top surface, a bottom surface and two side surfaces, the substrate has a plurality of resonance holes, the plurality of resonance holes penetrate the substrate, one end of the plurality of resonance holes is located on the open face with the other end on the short-circuit face;

A plurality of resonant metal layers are arranged in the plurality of resonant holes;

A grounded metal layer is provided on the short-circuit surface, the top surface, the bottom surface and the two side surfaces; wherein, the ground metal layer provided on the short-circuit surface is electrically connected to the plurality of resonant metal layers in the plurality of resonant holes The resonant metal layer forms an open end on the open surface; the ground metal layer is arranged on the bottom surface and is E-shaped, and there are holes on both sides of the E-shaped ground metal layer to expose the substrate two bare areas, the two bare areas extending on the open surface;

a metal pattern layer, disposed on the open surface, and electrically connected to the ground metal layer;

an input electrode disposed in one of the two bare areas;

an output electrode arranged in the other bare area of the two bare areas;

Wherein, a filter structure with mutual coupling is formed between the metal pattern layer and the plurality of resonant metal layers and between the ground metal layers, and the length of the resonant metal layer and the metal pattern layer can be adjusted to achieve the required the frequency band used.

Wherein, the metal pattern layer is composed of a plurality of lines, and the multi-lines include a first side line, a second side line, a first straight line, a second straight line and a third straight line, and the first side line is set at The junction of the open surface and the top surface, the junction of the two side surfaces and the open surface, and the junction of the open surface and the bottom surface are electrically connected to the grounded metal surface, and the second edge is set between the open surface and the bottom surface. The junction of the bottom surface is electrically connected with the ground metal layer.

Wherein, one end of the input electrode is disposed in one of the two bare areas, and the other end extends on the open surface and is adjacent to one of the plurality of resonance holes.

Wherein, one end of the output electrode is disposed in the other bare region of the two bare regions, and the other end extends on the bare region of the open surface and is adjacent to one of the plurality of resonant holes.

Wherein, the metal pattern layer is composed of a plurality of rectangular blocks and straight line segments, and the plurality of rectangular blocks are respectively arranged around the plurality of resonant holes on the open surface, and resonate with the plurality of resonant holes in the plurality of resonant holes. The metal layers are electrically connected, and a gap is formed between the plurality of rectangular blocks; the straight line segment is arranged on one side of the plurality of rectangular blocks.

Wherein, one end of the input electrode and the output electrode are respectively arranged on the two bare areas on the bottom surface of the substrate, the other ends of the input electrode and the output electrode both extend on the open surface and are L-shaped, and the The other ends of the input electrode and the output electrode are adjacent to the other side of the first rectangular block and the fourth rectangular block and form a gap.

Wherein, the multiple resonance holes include multiple circular holes and multiple elliptical holes with different diameters.

Wherein, the plurality of resonant metal layers are disposed on the inner walls of the plurality of elliptical holes and the plurality of circular holes.

Wherein, the plurality of resonant holes are elliptical holes with circular holes inside.

Wherein, the depth of the elliptical hole is smaller than the depth of the round hole.

Wherein, the metal pattern layer is in an inverted E shape, and the inverted E-shaped grounding metal layer surrounds one side of the plurality of resonant holes and is electrically connected with the grounding metal layers on the top surface and two side surfaces; The E-shaped grounding metal layer has an annular portion surrounding the elliptical hole with the smallest diameter, and the annular portion is electrically connected to the grounding metal layer on the bottom surface.

The present invention also provides a filter with improved structure, including:

A substrate, which has an open surface, a short-circuit surface, a top surface, a bottom surface and two side surfaces, the substrate has a plurality of resonance holes, the plurality of resonance holes penetrate the substrate, one end of the plurality of resonance holes on the open face with the other end on the short-circuit face;

A plurality of resonant metal layers are arranged in the plurality of resonant holes;

A grounded metal layer is provided on the short-circuit surface, the top surface, the bottom surface and the two side surfaces; wherein, the ground metal layer provided on the short-circuit surface is electrically connected to the plurality of resonant metal layers in the plurality of resonant holes The resonant metal layer is located on the open surface and forms an open end; the ground metal layer is arranged on the bottom surface and is E-shaped, and the two sides of the E-shaped ground metal layer have the base exposed two bare areas of , the two bare areas extending on the open face;

a metal pattern layer disposed on the open surface;

an input electrode disposed in one of the two bare areas;

an output electrode arranged in the other bare area of the two bare areas;

Wherein, the filter structure with mutual coupling is formed between the metal pattern layer and the plurality of resonant metal layers and between the ground metal layers, and the length of the plurality of resonant metal layers and the metal pattern layer can be adjusted to achieve required frequency band.

Wherein, the multiple resonance holes include multiple circular holes and multiple elliptical holes with different diameters.

Wherein, the plurality of resonant metal layers are disposed on the inner walls of the plurality of elliptical holes and the plurality of circular holes.

Wherein, the plurality of resonant holes are elliptical holes with circular holes inside.

Wherein, the depth of the elliptical hole is smaller than the depth of the circular hole.

The present invention provides a filter with improved structure. A filter structure with mutual coupling is formed between the metal pattern layer, the plurality of resonant metal layers and the grounded metal layer. The length of the resonant metal layer and the metal layer can be adjusted. Pattern layers to achieve the desired band of use.

Description of drawings

FIG. 1 is a schematic diagram of the appearance of the filter structure of the first embodiment of the invention;

Figure 2 is a schematic bottom view of Figure 1;

Fig. 3 is a rear view schematic diagram of Fig. 1;

FIG. 4 is a schematic diagram of the appearance of the filter structure of the second embodiment of the present invention;

5a is a schematic diagram of measurement curves of input reflection coefficient (S11) and forward transmission coefficient (S21) of the filter structure of the first embodiment of the present invention;

5b is a schematic diagram of the measurement curves of the input reflection coefficient (S11) and the forward transmission coefficient (S21) of the filter structure of the second embodiment of the present invention;

FIG. 6 is a schematic diagram of the appearance of the filter structure of the third embodiment of the present invention;

Fig. 7 is a schematic side sectional view of Fig. 6 at position 7-7;

FIG. 8 is a schematic diagram of the appearance of the filter structure of the fourth embodiment of the present invention.

In the picture:

filter structure 10;

matrix1;

open face 11;

Bare empty areas 111, 112, 113, 114;

Short circuit surface 12;

top surface 13;

bottom surface 14;

Bare empty area 141;

side 15, 16;

Resonant hole 17;

Oval holes 171a, 172a, 173a;

Round holes 171b, 172b, 173b;

Resonant metal layer 2;

Ground metal layer 3;

E-shaped pattern 31;

metal pattern layers 4, 4a, 4b;

rectangular blocks 41a, 42a, 43a, 44a;

ring portion 41b;

straight line segment 45a;

first edge 41;

second sideline 42;

first straight line 43;

second straight line 44;

interval 441;

third straight line 45;

Interval 451

gaps 46a, 47a;

input electrodes 5, 5a;

Output electrodes 6, 6a;

Curves 20, 20a, 30, 30a;

Cutoff band transmission zeros 201, 201a.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

Please refer to FIG. 1-FIG. 3 , which are schematic views of the appearance, bottom view and rear view of the filter structure of the first embodiment of the present invention. As shown in the figure: the filter with improved structure of the present invention, the filter structure 10 includes: a substrate 1, a plurality of resonant metal layers 2, a grounded metal layer 3, a metal pattern layer 4, an input electrode 5 and a Output electrode 6. Wherein, the inner metal layer 2 , the ground metal layer 3 , the input electrode 5 and the output electrode 6 cover the substrate 1 to form a dielectric filter structure. Wherein, the substrate 1 is made of high dielectric constant ceramic material into a square body, and has an open surface 11 , a short circuit surface 12 , a top surface 13 , a bottom surface 14 and two side surfaces 15 , 16 . A plurality of resonant holes 17 are disposed on the base 1 , the resonant holes 17 pass through the base 1 , one end of the resonant holes 17 is located on the open surface 11 , and the other end of the resonant holes 17 is opened on the short-circuit surface 12 . In this drawing, the resonance hole 17 is a circular hole.

The plurality of resonant metal layers 2 are disposed on inner walls of the plurality of resonant holes 17 , so that the plurality of resonant holes 17 form a resonator of the filter structure 10 .

The ground metal layer 3 is disposed on the short circuit surface 12 , the top surface 13 , the bottom surface 14 and the two side surfaces 15 , 16 . Wherein, the ground metal layer 3 is arranged on the short-circuit surface 12 and the plurality of resonant metal layers 2 in the plurality of resonant holes 17 are electrically connected to form a short-circuit end, and the plurality of resonant metal layers 2 are located on the open surface 11 form an open end. The ground metal layer 3 is arranged on the bottom surface 14 to form an E-shaped pattern 31, and two bare empty regions 141 that expose the substrate 1 are formed on both sides of the E-shaped pattern 31, and the two bare empty regions 141 extend over on the open face 11.

The metal pattern layer 4 is composed of a plurality of lines, and the plurality of lines includes a first side line 41 , a second side line 42 , a first straight line 43 , a second straight line 44 and a third straight line 45 . The first edge 41 is located at the intersection of the open surface 11 and the top surface 13, the intersection of the open surface 11 and the two side surfaces 15, 16, and the intersection of the open surface 11 and the bottom surface 14, and is connected to the The ground metal surface 3 is electrically connected. The second edge 42 is located at the intersection of the open surface 11 and the bottom surface 14 and is electrically connected to the ground metal layer 3 . The first straight line 43 is disposed between the two adjacent resonant holes 17 and is electrically connected to the first side line 41 and the second side line 42 . The second straight line 44 is arranged between the two adjacent resonant holes 17 and is electrically connected with the first side line 41 and the second side line 42, wherein the second straight line 44 is a dashed line with a space thereon 441. The third straight line 45 is arranged between the two adjacent resonant holes 17 and is electrically connected with the first side line 41 and the second side line 42, wherein the third straight line 45 is a dashed line with a The gap 451 is adjacent to the first edge 41 . The open surface 11 is surrounded by a plurality of bare surfaces 41, a second edge 42, a first straight line 43, a second straight line 44 and a third straight line 45 of the metal pattern layer 4. Outside the empty areas 111, 112, 113, 114, and between the resonant metal layer 2 of the resonant hole 17 and the grounded metal layer 3, the electrical characteristics of the filter structure 10 with mutual coupling can be adjusted by adjusting the resonant metal layer 2 The length and the metal pattern layer 4 are used to achieve the required bandwidth, and to provide functions such as low insertion loss and out-band rejection.

One end of the input electrode 5 is disposed on the bare area 141 , and the other end extends on the bare area 111 of the open surface 11 and is adjacent to one of the plurality of resonant holes 17 . The input electrode 5 is used to provide a signal input in the filter structure 10 for filtering processing.

One end of the output electrode 6 is disposed on the bare area 141 , and the other end extends on the bare area 114 of the open surface 11 and is adjacent to one of the plurality of resonant holes 17 . The signal output filtered by the filter structure 10 is provided by the output electrode 6 .

By means of the input electrode 5 , the output electrode 6 and the ground metal layer 3 of the bottom surface 14 of the filter structure 10 , the filter structure 10 can be surface-mounted on a circuit board (not shown in the figure).

Please refer to FIG. 4 , which is a schematic diagram of the appearance of the filter structure according to the second embodiment of the present invention. As shown in the figure: the filter structure 10 disclosed in the second embodiment is substantially the same as the filter structure 10 in the first embodiment, the difference lies in the metal pattern layer 4a, the input electrode 5a and the output of the second embodiment Electrode 6a. The metal pattern layer 4a is composed of a plurality of rectangular blocks 41a, 42a, 43a, 44a and a straight line segment 45a. The plurality of rectangular blocks 41a, 42a, 43a, 44a are respectively arranged around the plurality of resonant holes 17 and electrically connected with the plurality of resonant metal layers 2 in the plurality of resonant holes 17, and the plurality of rectangular blocks Each of 41a, 42a, 43a, 44a has a gap 46a formed therebetween. The straight line segment 45a is disposed on one side of the plurality of rectangular blocks 41a, 42a, 43a, 44a.

One end of the input electrode 5a and the output electrode 6a is arranged on the bare area 141 of the bottom surface 14 of the base body 1, and the other end of the input electrode 5a and the output electrode 6a extends on the open surface 11 in an L shape and the The other sides of the first rectangular block 41a and the fourth rectangular block 44a are adjacent to each other and form a gap 47a.

Similarly, the metal pattern layer 4a of the filter structure 10, the input electrode 5a, the output electrode 6a, the resonant metal layer 2 of the plurality of resonant holes 17, and the ground metal layer 3 have mutual coupling. The electrical characteristics of the filter structure 10 can be achieved by adjusting the length of the resonant metal layer 2 and the metal pattern layer 4 to achieve the required frequency band, and provide low insertion loss (insertion loss) and sideband rejection (out-band rejection), etc. effect.

Please refer to FIG. 5 a and FIG. 5 b , which are schematic diagrams of the measurement curves of the input reflection coefficient ( S11 ) and the forward transmission coefficient ( S21 ) of the filter structures of the first embodiment and the second embodiment of the present invention. As shown in the figure: since the pattern design of the metal pattern layer 4 and 4a of the filter structure 10 of the first embodiment and the second embodiment of the present invention are different, there is a curve 20, 20a and the curves 30, 30a of the forward transmission coefficient (S21). Therefore, the position of the transmission zero point 201 of the cut-off band shown on the curve 20 is on the right when performing the forward transmission coefficient measurement of the filter structure of the first embodiment. The position of the cut-off band transmission zero point 201a shown on the curve 20a for measuring the forward transmission coefficient of the filter structure 10 of the second embodiment is on the left.

It can be seen from the above measurements that the metal pattern layers 4 and 4a of the filter structure 10 of the present invention are different in pattern design in the first embodiment and the second embodiment. In addition to being able to design different frequency bands, the filter structure 10 The position of the transmission zero of the cut-off band is also different.

Please refer to FIG. 6 and FIG. 7 , which are the appearance of the filter structure of the third embodiment of the present invention and the schematic side cross-sectional view at position 7-7 in FIG. 6 . As shown in the figure: this embodiment is roughly the same as the first embodiment, the difference is that the plurality of resonant holes 17 are composed of the plurality of oval holes 171a, 172a, 173a with different diameters, and in this embodiment the diameter is small The elliptical hole 173a is located between two large diameter elliptical holes 171a, 172a. And each of the plurality of elliptical holes 171a, 172a, 173a has a round hole 171b, 172b, 173b, and the plurality of round holes 171b, 172b, 173b are adjacent to the upper edge of the inner diameter of the plurality of elliptical holes 171a, 172a, 173a . Next, the resonant metal layer 2 is disposed on the inner walls of the plurality of oval holes 171a, 172a, 173a and the plurality of round holes 171b, 172b, 173b. The plurality of resonant holes 17 are designed to communicate with the circular holes 171b (172b, 173b) with the elliptical holes 171a (172a, 173a), mainly to reduce the size of the filter structure 10, to increase the Q value of the filter structure, and Spurious responses can be suppressed. In this figure, the length of the elliptical holes 171a (172a, 173a) is smaller than the length of the circular holes 171b (172b, 173b), and the filter structure can be adjusted with the length of the plurality of elliptical holes 171a (172a, 173a) 10, and improve the frequency response of the filter structure 10.

Secondly, the input electrode 5 and the output electrode 6 are only disposed in the bare area 141 of the bottom surface 14 , and the other ends of the input electrode 5 and the output electrode 6 do not extend on the open surface 11 .

It is worth mentioning that the straight line segment 45a of the metal pattern layer 4a of the second embodiment can be arranged on one side of the plurality of resonant holes 17, so that the straight line segment 45a and the plurality of resonant holes 17 The resonant metal layer 2 generates coupling capacitance and inductance, so that the filter structure 10 can improve reflection coefficient (S11) matching and out-band rejection, and reach the required frequency band.

Please refer to FIG. 8 , which is a schematic diagram of the appearance of the filter structure according to the fourth embodiment of the present invention. As shown in the figure: this embodiment is roughly the same as the third embodiment, the difference is that the metal pattern layer 4b is an inverted E-shape, and the inverted E-shape surrounds one side of the plurality of resonant holes 17 and the top surface 13 and the ground metal layer 3 on the two sides 15 and 16 are electrically connected. Wherein, the inverted E-shaped grounding metal layer 3 has a ring portion 41 b surrounding the small-diameter elliptical hole 173 b, and is electrically connected to the grounding metal layer 3 on the bottom surface 14 .

By virtue of the inverted E-shaped design of the metal pattern layer 4b and the plurality of resonant metal layers 2 in the plurality of resonant holes 17, the electrical characteristics of the filter structure 10 having mutual coupling can be adjusted by adjusting the resonant metal layer 2 The length and the metal pattern layer 4b are used to achieve the required frequency band.

The above-mentioned embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention. The protection scope of the present invention shall be determined by the claims.

Claims (16)

1. A kind of 1. improved wave filter of structure, it is characterised in that including：

   One matrix, thereon with an open surface, a short-circuit face, a top surface, a bottom surface and two side faces, has multiple common on the matrix Shake hole, and the plurality of resonance holes run through the matrix, and one end of the plurality of resonance holes is located on the open surface, and the other end is located at the short circuit On face；

   Multiple resonance metal layers, in the plurality of resonance holes；

   One ground metal layer, on the short circuit face, the top surface, the bottom surface and the two side faces；Wherein, on the short circuit face Ground metal layer is electrically connected to form short-circuit end with the plurality of resonance metal layer in the plurality of resonance holes, the resonance metal layer position Open end is formed on open surface；The ground metal layer is arranged on the bottom surface and is in E shapes, and two of the ground metal layer in the E shapes With two exposed naked dummy sections of the matrix are made, which extends on the open surface for side；

   One metal pattern layer, is electrically connected on the open surface, and with the ground metal layer；

   One input electrode, in one of them naked dummy section of the two naked dummy section；

   One output electrode, in another naked dummy section of the two naked dummy section；

   Wherein, formed between the metal pattern layer and the plurality of resonance metal layer and between the ground metal layer with phase mutual coupling The filter construction of conjunction, can be reached required by length and the metal pattern layer for adjusting the resonance metal layer and used frequently Section.
2. 2. the improved wave filter of structure according to claim 1, it is characterised in that wherein, the metal pattern layer is by a plurality of Line forms, which includes one first sideline, one second sideline, a first straight line, a second straight line and one the 3rd straight line, First sideline is arranged on the junction of the junction of the open surface and the top surface, the two side faces and open surface, and open surface with The junction of bottom surface, and be electrically connected with the grounding metal plane, which is arranged on the open surface and the junction of the bottom surface And it is electrically connected with the ground metal layer.
3. 3. the improved wave filter of structure according to claim 2, it is characterised in that wherein, which is arranged on In one of them naked dummy section of the two naked dummy section, the other end is extended on the open surface, and is adjacent to the plurality of resonance holes One of resonance holes.
4. 4. the improved wave filter of structure according to claim 3, it is characterised in that wherein, which is arranged on In another naked dummy section of the two naked dummy section, the other end is extended on the naked dummy section of the open surface, and it is more to be adjacent to this One of resonance holes of a resonance holes.
5. 5. the improved wave filter of structure according to claim 1, it is characterised in that wherein, the metal pattern layer is by multiple Rectangular block and straightway composition, the plurality of rectangular block are respectively arranged on around the plurality of resonance holes on the open surface, and with The plurality of resonance metal layer in the plurality of resonance holes is electrically connected, and the plurality of rectangular block is to each other respectively formed with a gap； The straightway is arranged on the side of the plurality of rectangular block.
6. 6. the improved wave filter of structure according to claim 5, it is characterised in that wherein, the input electrode and the output One end of electrode is respectively arranged on the two naked dummy section of the bottom surface of the matrix, the other end of the input electrode and the output electrode Extend it is on the open surface and L-shaped, and the other end of the input electrode and the output electrode with first rectangle The opposite side of block and the 4th rectangular block is adjacent and formed with a gap.
7. 7. the improved wave filter of structure according to claim 1, it is characterised in that wherein, the plurality of resonance holes include more A circular hole and multiple elliptical apertures with different-diameter.
8. 8. the improved wave filter of structure according to claim 7, it is characterised in that wherein, the plurality of resonance metal layer is set On the inner wall of the plurality of elliptical aperture and the plurality of circular hole.
9. 9. the improved wave filter of structure according to claim 1, it is characterised in that wherein, the plurality of resonance holes are inside Has round-meshed elliptical aperture.
10. 10. the improved wave filter of structure according to claim 9, it is characterised in that wherein, the depth of the elliptical aperture is less than The depth of the circular hole.
11. 11. the improved wave filter of structure according to claim 10, it is characterised in that wherein, which is in one The shape of falling E, should the shape of falling E ground metal layer enclose arranged on the plurality of resonance holes side and with the ground metal layer of the top surface and two side faces It is electrically connected；Wherein, being somebody's turn to do the ground metal layer for the shape of falling E has the ring part being located on the elliptical aperture of diameter minimum, and should Ring part and the ground metal layer of the bottom surface are electrically connected.
12. A kind of 12. improved wave filter of structure, it is characterised in that including：

    One matrix, thereon with an open surface, a short-circuit face, a top surface, a bottom surface and two side faces, have on the matrix it is more each and every one Resonance holes, the plurality of resonance holes run through the matrix, and one end of the plurality of resonance holes is located on the open surface, and it is short that the other end is located at this On road surface；

    Multiple resonance metal layers, in the plurality of resonance holes；

    One ground metal layer, on the short circuit face, the top surface, the bottom surface and the two side faces；Wherein, on the short circuit face Ground metal layer is electrically connected to form short-circuit end with the plurality of resonance metal layer in the plurality of resonance holes, the resonance metal layer position In on open surface and forming open end；Arranged on the bottom surface and it is in E shapes in the ground metal layer, and in the ground metal layer of the E shapes Both sides have make two exposed naked dummy sections of the matrix, which extends on the open surface；

    One metal pattern layer, on the open surface；

    One input electrode, in one of them naked dummy section of the two naked dummy section；

    One output electrode, in another naked dummy section of the two naked dummy section；

    Wherein, formed between the metal pattern layer and the plurality of resonance metal layer and between the ground metal layer with phase mutual coupling The filter construction of conjunction, can reach required use by length and the metal pattern layer for adjusting the plurality of resonance metal layer Frequency range.
13. 13. the improved wave filter of structure according to claim 12, it is characterised in that wherein, the plurality of resonance holes include Multiple circular holes and multiple elliptical apertures with different-diameter.
14. 14. the improved wave filter of structure according to claim 13, it is characterised in that wherein, the plurality of resonance metal layer On the inner wall of the plurality of elliptical aperture and the plurality of circular hole.
15. 15. the improved wave filter of structure according to claim 12, it is characterised in that wherein, the plurality of resonance holes are interior Portion has round-meshed elliptical aperture.
16. 16. the improved wave filter of structure according to claim 15, it is characterised in that wherein, the depth of the elliptical aperture is small In the depth of the circular hole.