Electromagnetic shielding of plastic packaging in low-cost laser modules

Cheng, Wood-Hi; Cheng, Ji-Yen; Wu, Tzong–Lin; Wang, C.M.; Wang, S.C.; Jou, Wern-Shiarng

doi:10.1049/el:20000170

Cited by 14 publications

(6 citation statements)

References 2 publications

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“…Low cost, high EM shielding optical laser modules made with the modified thermosets using compression molding technology were reported [5,11]. Instead of using compressing molding, a systematic investigation on the EM shielding effectiveness (SE) of nylon66 or LCP composites using injection molded thermoplastic packaging was conducted in the author's previous work [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

The electromagnetic shielding effectiveness of carbon nanotubes polymer composites

Jou

Hsu

2007

Journal of Alloys and Compounds

112

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Section: Introductionmentioning

confidence: 99%

The electromagnetic shielding effectiveness of carbon nanotubes polymer composites

Jou

Hsu

2007

Journal of Alloys and Compounds

112

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“…Low-cost, high EM shielding, optical laser modules made with modified thermosets using compression molding technology were reported, 3,7 and a systematic investigation on the EM shielding effectiveness (SE) of injection-molded thermoplastic packaging using nylon66 and LCP composite was conducted in previous works. 1,2 With an optimized weight percentage of CF mixed in the Nylon66 and LCP composite, high EM shielding can be obtained.…”

Section: Introductionmentioning

confidence: 99%

A novel structure of woven continuous-carbon fiber composites with high electromagnetic shielding

Jou

2004

Journal of Elec Materi

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A novel structure employing the woven continuous-carbon fiber (CCF) epoxy composite with high electromagnetic (EM) shielding is presented experimentally and theoretically. The influences of weave type, number, and angle of overlapped plates upon the shielding effectiveness (SE) of the woven CCFepoxy composite are investigated. The minimum SE of the single, double, and triple-plain or balanced-twill woven CCF-composite plates was measured to be as high as 50 dB, 60 dB, and 70 dB, respectively. More than 100 dB in SE was obtained for the triple-overlapped, plain-weave CCF composite at a frequency of 0.9 GHz. The weight percentage of the single CCF-composite plate required for electronic application is 4.8% only, which is less than one quarter of the CF content, and the performance in SE is 10 dB higher in comparison with long, CF-filled, liquid-crystal polymer (LCP) composites. The SE calculated theoretically is consistent with that measured by the experiment.

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“…A low cost, high EM shielding opticallaser module, made with modified thermosets using compression molding technology, was reported, 5 and a systematic investigation on the EM shielding effectiveness (SE) of injection-molded thermoplastic packaging using a nylon66 composite was conducted by our research team. 1 With an optimized weight percentage of carbon fibers mixed in the nylon66 composite, a high EM shielding can be obtained.…”

Section: Introductionmentioning

confidence: 99%

The influence of fiber orientation on electromagnetic shielding in liquid-crystal polymers

Jou

Chiu

et al. 2002

J. Electron. Mater.

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The influence of conductive carbon-fiber orientation and weight percentage on the electromagnetic (EM) shielding effectiveness (SE) in liquid-crystal polymer (LCP) composites was investigated experimentally and theoretically. The experimental results show that the SE of LCP composites with longitudinal fiber orientation is higher than random fiber orientation under the same weight percentage of carbon fibers filled. This is because longitudinal fiber orientation is parallel to the electric field of the incident EM wave, and most of the energy of the incident wave is reflected by the longitudinal fiber. In comparison with nylon66 composites, the SEs of LCP composites with longitudinal fiber orientation are also higher than nylon66 composites with the same content of carbon fibers. Furthermore, the SE of 20% conductive carbon-fiber-filled LCP composites was measured to be 50 dB at a frequency of 0.3 GHz and 53 dB at 1 GHz, which is at least 10 dB higher than that of nylon66 composites. The SE predicted by theoretical models and measured by experiments was in good agreement for carbon-fiber-filled LCP composites of longitudinal and random fiber orientations.

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Electromagnetic shielding of plastic packaging in low-cost laser modules

Cited by 14 publications

References 2 publications

The electromagnetic shielding effectiveness of carbon nanotubes polymer composites

The electromagnetic shielding effectiveness of carbon nanotubes polymer composites

A novel structure of woven continuous-carbon fiber composites with high electromagnetic shielding

The influence of fiber orientation on electromagnetic shielding in liquid-crystal polymers

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