EMI shielding performance by metal plating on mold compound

Tai, Min Fee; Kok, Swee Leong; Mukai, Kenichiroh

doi:10.1109/iemt.2016.7761978

Cited by 6 publications

(7 citation statements)

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“…Therefore, the shielding of electromagnetic waves can be represented by the sum of reflection (

), absorption (

), and multiple reflections (

) loss of materials i.e., SE =

[ 65 , 66 , 67 ]. In this case,

can be ignored [ 7 , 68 ] if

is greater than 9 dB. Therefore,

and

can be derived by Simon formalism [ 69 , 70 ]:

where

is the volume resistivity (Ω∙cm), which is the same as the reciprocal of the electrical conductivity ( σ ), f is the frequency (MHz), and t is the thickness of the shielding material (cm).…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the shielding of electromagnetic waves can be represented by the sum of reflection (SE R ), absorption (SE A ), and multiple reflections (SE M ) loss of materials i.e., SE = SE R + SE A + SE M [65][66][67]. In this case, SE M can be ignored [7,68] if SE R is greater than 9 dB. Therefore, SE R and SE A can be derived by Simon formalism [69,70]:…”

Section: Shielding Effectiveness Measurementmentioning

confidence: 99%

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Electromagnetic Shielding Performance of Different Metallic Coatings Deposited by Arc Thermal Spray Process

2020

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Advancement in electronic and communication technologies bring us up to date, but it causes electromagnetic interference (EMI) resulting in failure of building and infrastructure, hospital, military base, nuclear plant, and sensitive electronics. Therefore, it is of the utmost importance to prevent the failure of structures and electronic components from EMI using conducting coating. In the present study, Cu, Cu-Zn, and Cu-Ni coating was deposited in different thicknesses and their morphology, composition, conductivity, and EMI shielding effectiveness are assessed. The scanning electron microscopy (SEM) results show that 100 µm coating possesses severe defects and porosity but once the thickness is increased to 500 µm, the porosity and electrical conductivity is gradually decreased and increased, respectively. Cu-Zn coating exhibited lowest in porosity, dense, and compact morphology. As the thickness of coating is increased, the EMI shielding effectiveness is increased. Moreover, 100 µm Cu-Zn coating shows 80 dB EMI shielding effectiveness at 1 GHz but Cu and Cu-Ni are found to be 68 and 12 dB, respectively. EMI shielding effectiveness results reveal that 100 µm Cu-Zn coating satisfy the minimum requirement for EMI shielding while Cu and Cu-Ni required higher thickness.

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“…Therefore, the shielding of electromagnetic waves can be represented by the sum of reflection (

), absorption (

), and multiple reflections (

) loss of materials i.e., SE =

[ 65 , 66 , 67 ]. In this case,

can be ignored [ 7 , 68 ] if

is greater than 9 dB. Therefore,

and

can be derived by Simon formalism [ 69 , 70 ]:

where

is the volume resistivity (Ω∙cm), which is the same as the reciprocal of the electrical conductivity ( σ ), f is the frequency (MHz), and t is the thickness of the shielding material (cm).…”

Section: Resultsmentioning

confidence: 99%

Section: Shielding Effectiveness Measurementmentioning

confidence: 99%

Electromagnetic Shielding Performance of Different Metallic Coatings Deposited by Arc Thermal Spray Process

2020

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“…A shielded metal lid was traditionally used to block EMI radiation from device to device. Furthermore, conformal shielding will be a more effective method to decrease the EMI, because it has a smaller size and a lighter weight than a shielding cover [10][11][12][13][14][15][16][17][18][19]. Some novel shielding structures were applied to packages based on conformal shielding technology [20,21].…”

Section: Introductionmentioning

confidence: 99%

Improving Electromagnetic Compatibility Performance of Narrowband-Iot Sip Module

Sun¹,

Zhou²,

Huang³

et al. 2021

PIER M

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A package-board co-design method was applied for a Narrowband Internet of Things (NB-IoT) SiP module. The electromagnetic interference (EMI) generated by the module was studied by improving the transmission quality of radio frequency (RF) signal. The SiP models of the initial design and the optimized design were simulated separately to show that the optimized design significantly increased effective transmission power of the RF signal and suppressed near-field electromagnetic radiation intensity to a certain extent. In addition, the optimized design model was verified by measurement. The measured results show good agreement with the simulated ones and demonstrate that the package-board co-design method can improve the electromagnetic compatibility (EMC) of NB-IoT applications.

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“…The second is the absorption loss, which occurs in low density, thin matching thickness, high complex permittivity values along with high conductivity, as well as magnetic materials where the electromagnetic waves pass through the shielding material and are converted into heat via ohmic loss. The third is multireflection loss, caused by electromagnetic waves propagating in a completely different direction through the materials that cannot be penetrated due to the retro-reflection or electromagnetic scattering into the shielding materials [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the conducting nature of metals, the absorption of shielding materials is greater and the chances to bounce back the waves are less. Thus, the multireflection loss (B) between two surfaces of the metal materials is very low and can be neglected [11,12]. Absorption loss in metals can be expressed using Equation (2) as follows: A = 0.085t fµ r σ r [dB] (2)…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Shielding Performance of Carbon Black Mixed Concrete with Zn–Al Metal Thermal Spray Coating

et al. 2020

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The electromagnetic pulse (EMP) is a destructive phenomenon which harms the building, telecommunication, and IT based infrastructure. Thus, it is required to reduce the effect of EMP using shielding materials. In the present study, we have used different thickness of concrete walls by incorporating 1 and 5 wt% of carbon black, as well as 100 µm thick Zn–Al coating using the arc thermal metal spraying method (ATMSM). The EMP was evaluated using waveguide measurement fixture for shielding performance of the concrete wall in the range of 0.85 to 1 GHz frequency. The results reveal that the maximum value, i.e., 41.60 dB is shown by the 5-300-N specimen before application of Zn–Al coating where the thickness of concrete wall was 300 mm and 5% carbon black. However, once the 100 µm thick Zn–Al coating was applied on concrete specimen, this value was increased up to 89.75 dB. The increase in shielding values around 48 dB after using the Zn–Al coating is attributed to the reflection loss of the metal thermal spray coating. Thus, the Zn–Al coating can be used for EMP application instead of metallic plate.

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EMI shielding performance by metal plating on mold compound

Cited by 6 publications

References 0 publications

Electromagnetic Shielding Performance of Different Metallic Coatings Deposited by Arc Thermal Spray Process

Electromagnetic Shielding Performance of Different Metallic Coatings Deposited by Arc Thermal Spray Process

Improving Electromagnetic Compatibility Performance of Narrowband-Iot Sip Module

Electromagnetic Shielding Performance of Carbon Black Mixed Concrete with Zn–Al Metal Thermal Spray Coating

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