Characterization of Electromagnetic Properties of Molded - - PowerPoint PPT Presentation

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Characterization of Electromagnetic Properties of Molded - - PowerPoint PPT Presentation

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Institut fr Hochfrequenztechnik und Funksysteme d F k t Characterization of Electromagnetic Properties of Molded Interconnect Devices Materials M ld d I t t D i M t i l and their Effect on Radio Frequency Applications - 9 th

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Institut für Hochfrequenztechnik d F k t und Funksysteme

Characterization of Electromagnetic Properties of M ld d I t t D i M t i l Molded Interconnect Devices Materials and their Effect on Radio Frequency Applications

  • 9th International MID Congress 2010 -

g

  • C. Orlob

1

  • C. Orlob

September 30th, 2010

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Outline

  • 1. Introduction
  • 2. Measurement methods

3 M t lt

  • 3. Measurement results

4 C l i & O tl k

  • 4. Conclusion & Outlook

2

  • C. Orlob

September 30th, 2010

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SLIDE 3

Outline

  • 1. Introduction
  • 2. Measurement methods

3 M t lt

  • 3. Measurement results

4 C l i & O tl k

  • 4. Conclusion & Outlook

3

  • C. Orlob

September 30th, 2010

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Introduction MID-LDS technology

Integration of electrical and mechanical devices on 3D-surfaces g Potential for increasing level of integration and reducing costs g g g Broad spectrum of attractive RF applications Broad spectrum of attractive RF-applications Mobile Phone WLAN Automotive Radar RFID 60 GH UWB W-USB 60 GHz-UWB 1 GHz 10 GHz 100 GHz 13,56 MHz

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September 30th, 2010

13,56 MHz

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Introduction MID-LDS process

Process steps:

  • 1. Injection molding
  • 2. Laser based surface activation

Specifically developed polymers required:

  • 3. Build up of metallization by current-free copper baths

laser beam Spec ca y de e oped po y e s equ ed Provided with an additive (organic metal complex) for laser activation Electromagnetically not yet characterized in RF-range MID activated surface g y y g

Goal Goal

Characterization of electromagnetic properties of MID-LDS

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September 30th, 2010

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Introduction P itti it Permittivity

Complex permittivity is defined as: In RF region ε ‘ always decreases with increasing frequency In RF-region εr

always decreases with increasing frequency

For limited bandwidth εr

‘ remains stationary

ε ’’ and tan δ = ε ’’/ ε ’ characterize the dielectric losses εr

and tan δ = εr / εr characterize the dielectric losses

tan δ typically increases with increasing frequency Antenna performance depends on permittivity: Example: Input reflection coefficient of a patch antenna p p p variation of εr' ± 12% variation of fr ± 6%

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September 30th, 2010

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SLIDE 7

Outline

  • 1. Introduction
  • 2. Measurement methods

3 M t lt

  • 3. Measurement results

4 C l i & O tl k

  • 4. Conclusion & Outlook

7

  • C. Orlob

September 30th, 2010

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Measurement methods Admittance cell

E4991RF Impedance/Material Analyzer with test fixture 16453A Fast and simple permittivity measurements up to 1 GHz Low sample requirements: planar plates Electrodes Electrodes

C li d i l R t Cylindrical Resonator

Suitable for loss tangent determination sample Measurement at few frequency points: 2, 7 GHz, 3,9 GHz,… Medium sample requirements: thin, long rods coaxial feeding

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Measurement methods

Typical RF-PCB device

Coplanar Waveguide

Suitable for broadband permittivity measurements (>decade) Suitable for the determination of total loss (dielectric + conduction) High sample requirements: accurately structured and metalized plaques Precise knowledge of metallization required (thickness, conductivity, surface roughness)

Rectangular Waveguide

X-band waveguide

g g

Suitable for accurate determination of permittivity and permeability M di l i l hi d h d Medium sample requirements: accurately machined, homogeneous and bulky samples (thickness > 10 mm)

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SLIDE 10

Outline

  • 1. Introduction
  • 2. Measurement methods

3 M t lt

  • 3. Measurement results

4 C l i & O tl k

  • 4. Conclusion & Outlook

10

  • C. Orlob

September 30th, 2010

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Measurement results Materials under test

Pocan DP T 7140 LDS: Solid PET/PBT polymer including organic metal complex (LDS additive) From data sheet: ε ‘ = 4 1 tan δ = 0 0138 at f = 1 MHz From data sheet: εr = 4.1, tan δ = 0.0138 at f = 1 MHz Assumed to be homogeneous and isotropic Non-magnetic (checked with rectangular waveguide method) Ultramid T 4381 LDS: Solid PA6/6T polymer including organic metal complex (LDS additive) F d t h t

‘

4 4 t δ 0 015 t f 1 MH From data sheet: εr

‘ = 4.4, tan δ = 0.015 at f = 1 MHz

Assumed to be homogeneous and isotropic Non-magnetic (checked with rectangular waveguide method)

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Measurement results

D t i d di l t i t t

Pocan DP T 7140 LDS

Determined dielectric constant:

  • Results are self-consistent
  • Low permittivity material: εr

‘ falls from 4 to 3.9

Uncertainty Admittance Cell: ∆εr

‘/εr ‘ = 14%

Uncertainty Rectangular Waveguide: ∆εr

‘/εr ‘ = 1%

Determined dielectric loss factor: Medium loss close to tan δ = 0.01

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Measurement results

Determined dielectric constant:

Ultramid T 4381 LDS

Determined dielectric constant: Results are self-consistent Low permittivity material: εr

‘ around 3.6

Uncertainty Admittance Cell: ∆εr

‘/εr ‘ = 14%

Uncertainty Rectangular Waveguide: ∆εr

‘/εr ‘ = 1%

Determined dielectric loss factor: Medium loss material

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Measurement results Antenna Design on MID

Comparison of simulated and measured S11 Realized antenna Measured permittivity values suitable for antenna design Permittivity values comparable to common RF- substrates (FR-4, Rogers 4003C)

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Measurement results Attenuation due to Losses

CPW sample (Cu metallization) Roughness of metallization Attenuation constant Higher attenuation than Ro4003C due to higher Higher attenuation than Ro4003C due to higher loss tangent and higher conduction losses (conductivity, surface roughness)

Reference material:Ro4003C (εr

‘ = 3.55, tan δ = 0.0027 at f = 10 GHz )

Glass reinforced hydrocarbon/ceramic with electrodeposited copper foil

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Outline

  • 1. Introduction
  • 2. Measurement methods

3 M t lt

  • 3. Measurement results

4 C l i & O tl k

  • 4. Conclusion & Outlook

16

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September 30th, 2010

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Conclusion & Outlook Conclusion

Characterization of complex permittivity of MID-LDS materials Pocan DP T 7140 LDS and Ultramid T 4381 LDS: Consistent results achieved with four different measurement methods Low permittivity near εr

‘ = 3.9 and εr ‘ = 3.6 (comparable with typical RF substrates)

Medium dielectric losses near tan δ = 0.01 and tan δ = 0.018 Results are suitable for a first antenna design Results are suitable for a first antenna design

Outlook

Improved material characterization: Including additional material types (LCP, PEEK,…) Up to 80 GHz for applications like automotive radar, 60-GHz UWB More detailed study of process-oriented loss mechanisms 17

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September 30th, 2010

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Conclusion & Outlook Patch Antenna

Single element of an antenna array Example for Automotive Radar: Resonance Frequency: fr = 77 GHz g y Substrate thickness: h = 127 um Dielectric constant: εr‘ = 4.6 Antenna Gain: Low loss substrates required for high gain

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September 30th, 2010