Source: https://patents.google.com/patent/US7764149B2/en
Timestamp: 2019-12-12 01:43:12
Document Index: 387298543

Matched Legal Cases: ['Application No. 10', 'art 340', 'art 340', 'art 345', 'art 345', 'Application No. 10']

US7764149B2 - Electromagnetic bandgap structure and printed circuit board - Google Patents
Electromagnetic bandgap structure and printed circuit board Download PDF
US7764149B2
US7764149B2 US12/007,122 US712208A US7764149B2 US 7764149 B2 US7764149 B2 US 7764149B2 US 712208 A US712208 A US 712208A US 7764149 B2 US7764149 B2 US 7764149B2
US12/007,122
US20080266018A1 (en
Mi-Ja Han
Hyo-Jic Jung
2007-04-30 Priority to KR10-2007-0041991 priority Critical
2007-04-30 Priority to KR1020070041991A priority patent/KR100851075B1/en
2008-01-07 Application filed by Samsung Electro Mechanics Co Ltd filed Critical Samsung Electro Mechanics Co Ltd
2008-01-07 Assigned to SAMSUNG ELECTRO-MECHANICS CO., LTD. reassignment SAMSUNG ELECTRO-MECHANICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAN, MI-JA, JUNG, HYO-JIC, KIM, HAN, PARK, DAE-HYUN
2008-10-30 Publication of US20080266018A1 publication Critical patent/US20080266018A1/en
2010-07-27 Publication of US7764149B2 publication Critical patent/US7764149B2/en
239000002184 metal Substances 0 abstract claims description 169
229910052751 metals Inorganic materials 0 abstract claims description 169
An electromagnetic bandgap structure and a printed circuit board that can solve a mixed signal problem between an analog circuit and a digital circuit are disclosed. In accordance with an embodiment of the present invention, the electromagnetic bandgap structure can include a metal layer; and a plurality of mushroom type structures including a metal plate and a via. Here, the plurality of mushroom type structures can be formed on the metal layer in a stacked structure. With the present invention, the small sized electromagnetic bandgap structure can have a lower bandgap frequency.
This application claims the benefit of Korean Patent Application No. 10-2007-0041991, filed on Apr. 30, 2007, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
The present invention relates to a printed circuit board, more specifically to a printed circuit board that can solve a mixed signal problem between an analog circuit and a digital circuit.
FIG. 2 is a sectional view showing an electromagnetic bandgap structure that solves a problem mixed signals between an analog circuit and a digital circuit in accordance with a conventional art, and FIG. 3 is a plan view showing a metal plate configuration of the electromagnetic bandgap structure shown in FIG. 2. FIG. 4 is a perspective view showing the electromagnetic bandgap structure shown in FIG. 2, and FIG. 5 is a schematic view showing an equivalent circuit of the electromagnetic bandgap structure shown in FIG. 2.
The electromagnetic bandgap structure 200 includes a first metal layer 210-1, a second metal layer 210-2, a first dielectric layer 220 a a second dielectric layer 220 b, a meal plate 232 and a via 234.
The first metal layer 210-1 and the metal plate 232 are connected to each other through the via 234. A mushroom type structure 230 is formed to include the metal plate 232 and the via 234 (refer to FIG. 4).
If the first meal layer 210-1 is a ground layer, the second metal layer 210-2 is a power layer. Also, if the first metal 210-1 is the power layer, the second layer 210-2 is the ground layer.
In other words, the repeated formation of the mushroom type structure 230 (refer to FIG. 3) results in a bandgap structure preventing a signal having a certain frequency band from being penetrated. At this time, the mushroom type structures 230, including the metal plates 232 and the vias 234, are repeatedly formed between the ground layer and the power layer.
The function preventing a signal having a certain frequency band from being penetrated, which is based on resistance RE and RP, inductance LE and LP, capacitance CE, CP and CG and conductance GP and GE, is approximated to the equivalent circuit shown in FIG. 5.
A mobile communication terminal is a good example for an electronic apparatus employing the board realized with the digital circuit and the RF circuit together. In the case of the mobile communication terminal, solving the problem mixed signals needs the noise shielding of an operation frequency band of the RF circuit between 0.8 and 2.0 GHz. The small sized mushroom type structure is also required. However, the foregoing electromagnetic bandgap structure may not satisfy the two conditions needed to solve the problem mixed signals.
Since the smaller sized mushroom type structure causes the bandgap frequency band shielding the noise to be increased, the mobile communication terminal is not effectively operated in the operation frequency band of the RF circuit between 0.8 and 2.0 GHz.
Accordingly, the present invention provides an electromagnetic bandgap structure and a printed circuit board that can allow the size not to be increased and have a low bandgap frequency band.
The present invention also provides an electromagnetic bandgap structure and a printed circuit board that can solve a problem mixed signal in an electronic apparatus (e.g. a mobile communication terminal) employing the board having the digital circuit and the RF circuit, realized therein together.
In addition, the present invention provides an electromagnetic bandgap structure and a printed circuit board that can allow the noise having a certain frequency band not to penetrate it.
An aspect of present invention features an electromagnetic bandgap structure including a first metal layer; a first dielectric layer, stacked on the first metal layer; a first metal plate, stacked on the first dielectric layer; a first via, connecting the first metal layer to the first metal plate; a second dielectric layer, stacked on the first metal plate and the first dielectric layer; a second metal layer, stacked on the second dielectric layer and having a hole formed at a predetermined position; a third dielectric layer, stacked on the second metal layer; a second metal plate, stacked on the third dielectric layer; and a second via, penetrating the hole formed in the second metal layer and connecting the first metal plate and the second metal plate.
Here, the second via can be formed to have an identical center axis to the first via, and the second via can be formed to have an identical center axis to the hole. At this time, a diameter of the hole can be set to be larger than that of the second via.
There can be a plurality of two-layered mushroom type structures including the first metal plates, the first vias, the second metal plates and the second vias. Here, a plurality of holes can be formed in the second metal layer, according to a position of each second via of the two-layered mushroom type structures
The plurality of holes can be formed to be away from each other at regular intervals.
Another aspect of present invention features an electromagnetic bandgap structure including a metal layer; and a plurality of mushroom type structures including metal plates and vias. Here, the plurality of mushroom type structures can be formed on the metal layer in a stacked structure
Here, each metal plate of any two adjacent ones of the plurality of mushroom type structures can be formed between metal layers.
Another aspect of present invention features an printed circuit board having an analog circuit and a digital circuit. The printed circuit board can include an electromagnetic bandgap structure which is disposed between the analog circuit and the digital circuit, the electromagnetic bandgap structure including a first metal layer; a first dielectric layer, stacked on the first metal layer; a first metal plate, stacked on the first dielectric layer; a first via, connecting the first metal layer to the first metal plate; a second dielectric layer, stacked on the first metal plate and the first dielectric layer; a second metal layer, stacked on the second dielectric layer and having a hole formed at a predetermined position; a third dielectric layer, stacked on the second metal layer; a second metal plate, stacked on the third dielectric layer; and a second via, penetrating the hole formed in the second metal layer and connecting the first metal plate and the second metal plate.
Here, the first metal layer can be any one of a ground layer and a power layer, and the second metal layer can be the other.
The second via can be formed to have an identical center axis to the first via, and the second via can be formed to have an identical center axis to the hole. At this time, a diameter of the hole can be set to be larger than that of the second via.
There can be a plurality of two-layered mushroom type structures including the first metal plates, the first vias, the second metal plates and the second vias. Here, a plurality of holes can be formed in the second metal layer, according to a position of each second via of the two-layered mushroom type structures.
The analog circuit can be an RF circuit receiving a wireless signal from an outside.
Another aspect of present invention features a printed circuit board having an analog circuit and a digital circuit. The printed circuit board can include an electromagnetic bandgap structure which is disposed between the analog circuit and the digital circuit, the electromagnetic bandgap structure including a metal layer; and a plurality of mushroom type structures including metal plates and vias. Here, the plurality of mushroom type structures can be formed on the metal layer in a stacked structure.
FIG. 1 is a sectional view showing a printed circuit board including analog circuit and a digital circuit;
FIG. 2 is a sectional view showing an electromagnetic bandgap structure that solves a problem mixed signals between an analog circuit and a digital circuit in accordance with a conventional art;
FIG. 3 is a plan view showing a metal plate configuration of the electromagnetic bandgap structure shown in FIG. 2;
FIG. 4 is a perspective view showing the electromagnetic bandgap structure shown in FIG. 2;
FIG. 5 is a schematic view showing an equivalent circuit of the electromagnetic bandgap structure shown in FIG. 2;
FIG. 6 is a perspective view showing an electromagnetic bandgap structure which solves a mixed signal problem between an analog circuit and a digital circuit;
FIG. 7 is a sectional view showing an electromagnetic bandgap structure shown in FIG. 6; and
FIG. 8 is graphs showing results that are computer-simulated by using electromagnetic bandgap structures in accordance with a conventional art and an embodiment of the present invention.
FIG. 6 is a perspective view showing an electromagnetic bandgap structure which solves a mixed signal problem between an analog circuit and a digital circuit, and FIG. 7 is a sectional view showing an electromagnetic bandgap structure shown in FIG. 6.
Referring to FIG. 6 and FIG. 7, the electromagnetic bandgap structure 300 in accordance with an embodiment of the present invention can include a first metal layer 210-1, a second metal layer 210-2, having a hole 350 formed at a predetermined position, a first dielectric layer 220 a, a second dielectric layer 220 b, a third dielectric layer 220 c, a first metal plate 330, a second metal plate 335, a first via 340 and a second via 345.
In other words, the first dielectric layer 220 a can be stacked on the first metal layer 210-1, and the first metal plate 330 can be stacked on the first dielectric layer 220 a. The first metal layer 210-1 and the first metal plate 330 can be connected to each other through the first via 340. The second dielectric layer 220 b can be stacked on the first metal plate 330 and the first dielectric layer 220 a, and the second metal layer 210-2 can be stacked in the second dielectric layer 220 b. The third dielectric layer 220 c can be stacked in the second metal layer 210-2, and the second metal plate 335 can be stacked in the third dielectric layer 220 c. The first metal plate 330 and the second metal layer 335 can be connected to each other through the second via 345 penetrating the hole 350 formed in the second metal layer 210-2. Here, the first metal plate 330, the first via 340, the second metal plate 335 and the second via 345 can be arranged in the type in which the mushroom type structures are stacked as a two-layered structure (hereinafter, referred to as a “stacked mushroom type structure 370”) by using the first metal layer 210-1 as a base surface.
As described with reference to FIG. 6 and FIG. 7, the below description is based on the type in which the mushroom type structures are stacked as the two-layered structure (i.e. the two-layered mushroom type structure). However, the electromagnetic bandgap structure 300 of the present invention is not limited to the two-layered mushroom type structure. Alternatively, the electromagnetic bandgap structure 300 can have the type in which the mushroom type structures are stacked in 3 or 4 or more-layered structure.
In other words, the electromagnetic bandgap structure 300 of the present invention can include a plurality of mushroom type structures having metal plates and vias. Here, the plurality of mushroom type structures can be formed on any one metal layer in the stacked structure. At this time, each metal plate of any two adjacent ones of the plurality of mushroom type structures can be formed between metal layers.
Each element of the electromagnetic bandgap structure 300 of the present invention will be described hereinafter.
The first metal layer 210-1 and the second metal layer 210-2 can be used as means for connecting an electrical power. For example, if the first metal layer 210-1 is a ground layer, the second metal layer 210-2 can be a power layer. If the first metal layer 210-1 is the power layer, the second metal layer 210-2 can be the ground layer. In other words, the first metal layer 210-1 and the second metal layer 210-2 can be each one of the ground layer and the power layer, which are placed close to each other, and a dielectric layer 220 can be placed between the ground layer and the power layer.
Accordingly, it is natural that any metal material capable of being provided with the power and transferring an electrical signal can be used without any limitation. The same can be applied to the first metal plate 330, the second metal plate 335, the first via 340 and the second via 345, which are described below.
The dielectric layer 220 can be formed between the first metal layer 210-1 and the second metal layer 210-2 and in an upper part of the second metal layer 210-2. The dielectric layer 220 can be distinguished into the first dielectric layer 220 a, the second dielectric layer 220 b and the third dielectric layer 220 c according to their formation time.
Here, the first dielectric layer 220 a, the second dielectric layer 220 b and the third dielectric layer 220 c, respectively, can consist of materials having different dielectric constants, but alternatively, at least one dielectric layer can consist of materials having the same dielectric constant. For example, the second dielectric layer 220 b and the third dielectric layer 220 c can be formed by using the same dielectric material for the convenience of the stacking process and the adjustment of the bandgap frequency.
As such, selecting or adjusting the dielectric material (i.e. the corresponding dielectric constant) included in each dielectric layer adequately can make it possible to approach a desired bandgap frequency band (i.e. between 0.8 and 2.0 GHz) in accordance with the present invention. Of course, each stacked thickness of the three dielectric layers 220 a, 220 b and 220 c can also be adequately adjusted to approach the desired bandgap frequency band.
For example, even though the electromagnetic bandgap structures 300 have the same size, the corresponding bandgap frequency band can approach the desired frequency band by largely decreasing the stacked thickness of the second dielectric layer 220 b or the third dielectric layer 220 c and increasing the stacked thickness of the first dielectric layer 220 a as much as the stacked thickness of the second dielectric layer 220 b or the third dielectric layer 220 c is decreased. Here, the bandgap frequency can refer to the frequency prevented from being transferred among the electromagnetic wave transferred from one side to the other side.
The first via 340 can connect the first metal layer 210-1 to the first metal plate 330. Also, the second via 345 can connect the first metal plate 330 to the second metal plate 335. At this time, as shown in FIG. 6 and FIG. 7, the second via 345 can be formed to have the same center axis as the first via 340. Of course, the second via 345 can be formed to have a different center axis from the first via 340. For describing the method of forming these vias, the method of forming the first via 340, for example, will be described below.
The first metal layer 210-1, the first dielectric layer 220 a and the first metal plate 330 can be successively stacked. A via land (not shown) can be formed at a position in the metal plate 330. Here, the position of the metal plate 330 can be the position in which the first via 340 is desired to be formed for the electrical connection to the first metal layer 210-1. The via land, which is to reduce the position error in the drilling process for forming the first via 340, can be formed more largely than the sectional area size of the first via 340. Then, through the drilling process, the via can be formed to penetrate the via land and the first dielectric layer 220 a. Alternatively, the via penetrating the via land, the first dielectric layer 220 a and the first metal layer 210-1 can be formed. After the via is formed, the plating process can be performed to allow a plating layer to be formed on the internal wall of the via in order to electrically connect the first metal layer 210-1 to the first metal plate 330. According to the plating process, a plating layer can be formed on the internal wall of the via excluding the center part among the inside part of the via or the entire inside part of the via can be completely filled. In case that the inside part of the via has an empty center part, the empty center part can be filled with the dielectric material or air. Through the foregoing processes, the first via 340 can have one end part 340 a, connected to the first metal layer 210-1, and the other end part 340 b, connected to the first metal plate 330.
The second via 345 can be formed through the similar processes to the aforementioned processes of forming the first via 340. Through the processes, the second via 345 can have one end part 345 a, which is connected to the first metal plate 330, and the other end part 345 b, which is connected to the second metal plate 335. Of course, the process of forming the hole 350 can be performed by removing a predetermined part of the second metal layer 210-2 before forming the second via 345 connecting the first metal plate 330 to the second metal plate 335. For example, the hole 350 can be formed at a position of the second metal layer 210-2, and then, the second via 345 penetrating the hole 350 can be formed. At this time, the process of forming the hole 350 can be performed after the third dielectric layer 220 c is stacked in the second metal layer 210-2 or before the third dielectric layer 220 c is stacked in.
Here, the second via 345 can be formed to have the same center axis as the hole 350 in order to connect the metal plates to each other by penetrating the hole 350 formed on the second metal layer 210-2. Similarly, the hole 350 formed on the second metal layer 210-2 can have a larger diameter than the second via 345 in order to allow the second via 345 to penetrate the hole 350 formed on the second metal layer 210-2 and to connect the metal plates to each other.
Although FIG. 6 and FIG. 7 illustrate the case that one first via 340 and one second via 345 are connected to each metal plate, a plurality of vias can be connected to each metal plate. Also, even if the first metal plate 330 and the second metal plate 335 have a regular square shape, the first and second metal plates 330 and 335 can have various shapes such as polygons, for example, triangles and hexagons, circles and ellipses.
Also, a plurality of stacked structures 370 (e.g. a two-layered mushroom type structure in the embodiment of the present invention) including the first metal plate 330, the first via 340, the second metal plate 335 and the second via 345 can be arranged as described in FIG. 3, for example. In other words, it is possible to block a signal having a frequency band corresponding to the operation frequency band of the analog circuit (e.g. the RF circuit) among the electromagnetic wave proceeding from the digital circuit to the analog circuit by allowing the stacked structure 370 to be away from each other at predetermined intervals to be repeatedly arranged.
For this, the second metal layer 210-2 can form a plurality of holes 350, and the stacked structures 370 can be arranged one by one at a position corresponding to a position in which each hole 350 is formed. At this time, the first metal plates 330 of the plurality of arranged stacked structures 370 can be arranged on the same or different planar surface (in the case of the second metal plates 335, the same can be described). Also, the plurality of holes 350 can be away from each other in regular intervals and be formed on the second metal layer 210-2.
As such, if the electromagnetic bandgap structure 300 by the stacked structure 370 including the first metal plate 330, the first via 340, the second metal plate 335 and the second via 345 is arranged inside the printed circuit board including the analog circuit and the digital circuit, since an inductance value corresponding to the via and a capacitance value corresponding to the dielectric layer can be acquired more enough as compared with the conventional electromagnetic bandgap structure of FIG. 4, the bandgap frequency can be lowered. This will be described more clearly with reference to FIG. 8.
As described above, the electromagnetic bandgap structure 300 of the present invention 300 can be arranged inside the printed circuit board having the analog circuit and the digital circuit. In other words, in accordance with an embodiment of the present invention, the printed circuit board can have the analog circuit and the digital circuit. At this time, the analog circuit can be the RF circuit such as an antenna receiving a wireless signal from an outside.
In the printed circuit board of the present invention, the electromagnetic bandgap structure 300 illustrated in FIG. 6 and FIG. 7 can be arranged between the analog circuit and the digital circuit. For example, the electromagnetic bandgap structure 300 can be arranged between the RF circuit 140 and the digital circuit 130 of the printed circuit board illustrated in FIG. 1. This is to block an electromagnetic wave having a frequency band which is similar to the operation frequency band (e.g. 0.8˜2.0 GHz) of the RF circuit 140 among the transferred electromagnetic wave by arranging the electromagnetic bandgap structure 300 to allow the electromagnetic wave generated from the digital circuit 130 to necessarily pass through the electromagnetic bandgap structure 300 before being transferred to the RF circuit 140.
Accordingly, the electromagnetic bandgap structure 300 of the present invention can be arranged in a closed curve shape about the RF circuit 140 and the digital circuit 130. Alternatively, the electromagnetic bandgap structure 300 can be arranged in a signal transferring path between the digital circuit and the analog circuit. It is obvious that the electromagnetic bandgap structure 300 can be arranged in various ways.
As described above, arranging the electromagnetic bandgap structure 300 inside the printed circuit board can make it possible to prevent an electromagnetic wave having a frequency band of the electromagnetic wave transferred from the digital circuit to the analog circuit from being transferred. This can solve the mixed signal problem
FIG. 8 and the below table 1 show computer-simulated results that compare the case of the conventional electromagnetic bandgap structure 200 (refer to (a) of FIG. 8) with the case of the electromagnetic bandgap structure 300 of the present invention (refer to (b) of FIG. 8).
However, it must be understood clearly that despite the same design condition, FIG. 8 and the below table 1 are merely examples showing that having the stacked structure such as the electromagnetic bandgap structure 300 of the present invention can makes it possible to lower the bandgap frequency bandgap band largely as compared with the conventional electromagnetic bandgap structure 200.
In other words, the numbers shown for each parameter of the following table 1 can be merely values identically set for comparison and it is natural that adjusting various conditions such as the shape and size of the structure, and the thickness, dielectric constant and configuration of each element appropriately can design the electromagnetic bandgap structure to have a desired bandgap frequency band or a lower bandgap frequency band when controlling the bandgap frequency band blocked by the electromagnetic bandgap structure 300 of the present invention.
Each parameter of the following table 1 will be described before the description related to FIG. 8 and the following table 1. The ‘structure size’ refers to the size (area size) of the metal plate in one electromagnetic bandgap structure (refer to 232 of FIG. 3 or 330 (335) of FIG. 6), the ‘structure distance’ refers to the spaced distance between two adjacent electromagnetic bandgap structures. The ‘upper dielectric layer thickness’ refers to the thickness of the second dielectric layer 220 b in the conventional electromagnetic bandgap structure 200, and the thickness of the second and third dielectric layers 220 b and 220 c in the electromagnetic bandgap structure 300 of the present invention. The ‘lower dielectric layer thickness’ refers to the thickness of the first dielectric layer 220 a in the conventional electromagnetic bandgap structure 200 and the electromagnetic bandgap structure 300 of the present invention.
TABLE 1 Conventional structure Structure of invention (shown in FIG. 4) (shown in FIG. 6) Structure size 81 mm2 (9 × 9) 81 mm2 (9 × 9) Upper dielectric layer 35 μm 35 μm thickness Lower dielectric layer 100 μm 100 μm thickness Structure distance 1 mm 1 mm Bandgap frequency 1.54 GHz~2.55 GHz 1.05 GHz~2.39 GHz (on a (−)60 dB basis)
Referring to FIG. 8 and table 1, although the conventional electromagnetic bandgap structure 200 and the electromagnetic bandgap structure 300 of the present invention have the same design conditions such as the size of the structure, it can be recognized that the electromagnetic bandgap structure 300 of the present invention has the bandgap frequency band that is lower than approximately 0.5 GHz or more as compared with the conventional electromagnetic bandgap structure. This can be because the electromagnetic bandgap structure 300 of the present invention has the structure in which the mushroom type structures are stacked in a two-layered form (i.e. the stacked structure). This can be described below with reference to the equivalent circuit of FIG. 5.
The electromagnetic bandgap structure 300 of the present invention can acquire an inductance component corresponding to the lengthwise direction of the second via 345 (refer to LE component by the via 234 of FIG. 5) more as compared with the conventional electromagnetic bandgap structure 200 due to having the stacked structure. Also, the capacitance value according to the dielectric material included in the third dielectric layer 220 c and the corresponding thickness (refer to CE and CP component by the dielectric layer 220 of FIG. 5) can be more acquired. As such, the bandgap frequency band blocked through the electromagnetic bandgap structure 300 of the present invention by the additionally acquired inductance value and capacitance value can be lowered as compared with the conventional structure.
Accordingly, if the electromagnetic bandgap structure 300 having the stacked structure like the present invention stacks a lot of mushroom type structures more (i.e. in a multi-layered form), since the acquired inductance value and capacitance value are increased, it can be easily recognized that it is possible to lower the bandgap frequency band more largely.
It can be also easily recognized that the two-layered stacked structure of the electromagnetic bandgap structure 300 of the present invention is very useful and appropriate through the fact that most of the typical printed circuit boards used for electronic apparatuses have the multi-layered (e.g. the printed circuit board applied to a mobile phone has 8 or 10-layered structure). In other words, since the printed circuit board itself is configured to include a plurality of layers, when the electromagnetic bandgap structure 300 of the present invention is applied to the printed circuit board, it can be unnecessary to add a separate stacking process and it is possible to maintain the height and volume of the printed circuit board as they are.
In addition, the electromagnetic bandgap structure 300 of the present invention can lower the bandgap frequency band more or select a desired bandgap frequency band by simply changing the configuration without the design process of minutely adjusting or changing the size, quantity and material of the structure to lower the bandgap frequency band.
1. An electromagnetic bandgap structure, comprising:
a first dielectric layer, stacked on the first metal layer;
a first metal plate, stacked on the first dielectric layer;
a first via, connecting the first metal layer to the first metal plate;
a second dielectric layer, stacked on the first metal plate and the first dielectric layer;
a second metal layer, stacked on the second dielectric layer and having a hole formed at a predetermined position;
a third dielectric layer, stacked on the second metal layer;
a second metal plate, stacked on the third dielectric layer; and
a second via, penetrating the hole formed in the second metal layer and connecting the first metal plate and the second metal plate,
wherein the first metal layer is any one of a ground layer and a power layer, and the second metal layer is the other.
2. The electromagnetic bandgap structure of claim 1, wherein the second via is formed to have an identical center axis to the first via.
3. The electromagnetic bandgap structure of claim 1, wherein the second via is formed to have an identical center axis to the hole,
whereas a diameter of the hole is set to be larger than that of the second via.
4. The electromagnetic bandgap structure of claim 1 further comprising: a plurality of two-layered mushroom type structures including one or more additional first metal plates, one or more additional first vias, one or more additional second metal plates, and one or more additional second vias,
whereas a plurality of holes are formed in the second metal layer, according to a position of each second via of the two-layered mushroom type structures.
5. The electromagnetic bandgap structure of claim 4, wherein the plurality of holes are formed to be away from each other at regular intervals.
6. A printed circuit board having an analog circuit and a digital circuit, the printed circuit board including an electromagnetic bandgap structure that is disposed between the analog circuit and the digital circuit, the electromagnetic bandgap structure comprising:
7. The electromagnetic bandgap structure of claim 6 further comprising: a plurality of two-layered mushroom type structures including one or more additional first metal plates, one or more additional first vias, one or more additional second metal plates, and one or more additional second vias,
8. The printed circuit board of claim 7, wherein the respective hole of each said two-layered mushroom type structure is formed to be away from each other at regular intervals.
9. The printed circuit board of claim 6, wherein the analog circuit is an RF circuit receiving a wireless signal.
10. The printed circuit board of claim 6, wherein the second via is formed to have an identical center axis to the first via.
11. The printed circuit board of claim 8, wherein the second via is formed to have an identical center axis to the hole,
US12/007,122 2007-04-30 2008-01-07 Electromagnetic bandgap structure and printed circuit board Expired - Fee Related US7764149B2 (en)
KR10-2007-0041991 2007-04-30
KR1020070041991A KR100851075B1 (en) 2007-04-30 2007-04-30 Electromagnetic bandgap structure and printed circuit board
US20080266018A1 US20080266018A1 (en) 2008-10-30
US7764149B2 true US7764149B2 (en) 2010-07-27
ID=39829562
US12/007,122 Expired - Fee Related US7764149B2 (en) 2007-04-30 2008-01-07 Electromagnetic bandgap structure and printed circuit board
US (1) US7764149B2 (en)
JP (1) JP4755215B2 (en)
KR (1) KR100851075B1 (en)
CN (1) CN101299904B (en)
DE (1) DE102008003689B4 (en)
TW (1) TWI369164B (en)
US20100085128A1 (en) * 2008-10-08 2010-04-08 Samsung Electro-Mechanics Co., Ltd. Electro-magnetic bandgap structure
US20110157857A1 (en) * 2009-12-25 2011-06-30 Sony Corporation Circuit board laminated module and electronic equipment
US8786507B2 (en) 2011-04-27 2014-07-22 Blackberry Limited Antenna assembly utilizing metal-dielectric structures
US8816921B2 (en) 2011-04-27 2014-08-26 Blackberry Limited Multiple antenna assembly utilizing electro band gap isolation structures
US9755320B2 (en) 2014-07-01 2017-09-05 Asustek Computer Inc. Electromagnetic bandgap structure and electronic device having the same
JP4722968B2 (en) * 2007-06-22 2011-07-13 サムソン エレクトロ−メカニックス カンパニーリミテッド． Electromagnetic band gap structure and printed circuit board
KR100998718B1 (en) 2008-01-21 2010-12-07 삼성전기주식회사 Electromagnetic bandgap structure and printed circuit board
JP5326649B2 (en) * 2009-02-24 2013-10-30 日本電気株式会社 Antenna, array antenna, printed circuit board, and electronic device using the same
AT12325U1 (en) * 2009-06-30 2012-03-15 Austria Tech & System Tech Multilayer conductor plate, especially flame resistant and / or smoke gas suppressive multilayer conductor plate
JP5660044B2 (en) * 2009-10-20 2015-01-28 日本電気株式会社 Wiring board design support device, wiring board design method, and program
JP5660124B2 (en) 2010-03-08 2015-01-28 日本電気株式会社 Structure and wiring board
WO2011111311A1 (en) 2010-03-08 2011-09-15 日本電気株式会社 Structure, wiring substrate, and wiring substrate manufacturing method
EP2549586A1 (en) * 2010-03-19 2013-01-23 Nec Corporation Electronic apparatus
CN102033976B (en) * 2010-09-17 2014-04-09 北京航空航天大学 Compact electromagnetic band gap structure for avoiding high-speed circuit noise
JP5725032B2 (en) * 2010-09-28 2015-05-27 日本電気株式会社 Structure and wiring board
KR101465968B1 (en) * 2010-12-20 2014-11-28 인텔 코포레이션 A chip apparatus, a method of making same, and a computer system
TWI524586B (en) 2013-08-09 2016-03-01 Global Unichip Corp Electromagnetic energy bandgap circuit includes a planar resonant structure
JP6168943B2 (en) * 2013-09-20 2017-07-26 株式会社東芝 EBG structure, semiconductor device and circuit board
US10403973B2 (en) * 2014-04-22 2019-09-03 Intel Corporation EBG designs for mitigating radio frequency interference
KR101623054B1 (en) 2014-05-16 2016-05-24 한국전기연구원 Electromagnetic band-gap structure and electrical component using the same
JPWO2017195739A1 (en) * 2016-05-11 2019-03-14 日本電気株式会社 Structure and wiring board
KR20180027133A (en) * 2016-09-06 2018-03-14 한국전자통신연구원 Electromagnetic bandgap structure and manufacturing method thereof
WO2006016586A1 (en) 2004-08-10 2006-02-16 Mitsui Mining & Smelting Co., Ltd. Method for manufacturing multilayer printed wiring board and multilayer printed wiring board obtained by the manufacturing method
JP2006093482A (en) 2004-09-27 2006-04-06 Kyocera Corp Glass ceramic wiring board with built-in capacitor
JPH0616586A (en) * 1992-06-30 1994-01-25 Asahi Glass Co Ltd Fluorine-containing alkene and its production
JPH07263908A (en) * 1994-03-18 1995-10-13 Matsushita Electric Ind Co Ltd Chip type high frequency low pass filter
JP2000183541A (en) * 1998-12-11 2000-06-30 Toshiba Corp Multilayer printed board
JP2001144091A (en) * 1999-11-11 2001-05-25 Sanyo Electric Co Ltd Semiconductor ic
KR101183224B1 (en) 2005-10-17 2012-09-14 주식회사 포스코 Reducing for pulverized coal of formed coal storage device
2007-04-30 KR KR1020070041991A patent/KR100851075B1/en not_active IP Right Cessation
2008-01-07 US US12/007,122 patent/US7764149B2/en not_active Expired - Fee Related
2008-01-09 DE DE102008003689A patent/DE102008003689B4/en not_active Expired - Fee Related
2008-01-10 TW TW097101054A patent/TWI369164B/en not_active IP Right Cessation
2008-02-25 JP JP2008043021A patent/JP4755215B2/en not_active Expired - Fee Related
2008-02-27 CN CN200810082717XA patent/CN101299904B/en not_active IP Right Cessation
Japanese Office Action dated Apr. 27, 2010 and issued in corresponding Japanese Patent Application 2008-043021.
Korean Patent Office Action, mailed Mar. 18, 2008 and issued in corresponding Korean Patent Application No. 10-2007-0041991.
US7943864B2 (en) * 2007-06-22 2011-05-17 Samsung Electro-Mechanics Co., Ltd. Printed circuit board having electromagnetic bandgap structure
US7973619B2 (en) * 2008-10-08 2011-07-05 Samsung Electro-Mechanics Co., Ltd. Electro-magnetic bandgap structure
US8254144B2 (en) * 2009-12-25 2012-08-28 Sony Corporation Circuit board laminated module and electronic equipment
CN101299904B (en) 2010-09-08
JP4755215B2 (en) 2011-08-24
JP2008277755A (en) 2008-11-13
KR100851075B1 (en) 2008-08-12
CN101299904A (en) 2008-11-05
DE102008003689B4 (en) 2012-11-15
US20080266018A1 (en) 2008-10-30
DE102008003689A1 (en) 2008-11-13
TWI369164B (en) 2012-07-21
TW200843604A (en) 2008-11-01
US6700789B2 (en) 2004-03-02 High-frequency wiring board
JP2008524845A (en) 2008-07-10 High frequency multilayer printed circuit board including through connection
JP5005649B2 (en) 2012-08-22 Electromagnetic band gap structure and printed circuit board
JP2012065371A (en) 2012-03-29 Multiband antenna array using electromagnetic bandgap structures
US7057564B2 (en) 2006-06-06 Multilayer cavity slot antenna
US20030048234A1 (en) 2003-03-13 Antenna with a magnetic interface
US7423608B2 (en) 2008-09-09 High impedance electromagnetic surface and method
US20040108933A1 (en) 2004-06-10 Symmetrical stacked inductor
DE60308266T2 (en) 2007-09-13 Highly efficient resonant line
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HAN, MI-JA;KIM, HAN;PARK, DAE-HYUN;AND OTHERS;REEL/FRAME:020383/0226