VR2R-0306
① SA Source
- Source: 開啟完整 SA 文章
- Section:
PCB vs Flyover Cables - Line hint:
276
Context Before
Conductor loss is driven by copper surface roughness. As signals travel down the copper traces in the PCB, energy is lost due to the resistance in copper. At higher frequencies, the signal traveling through the copper crowds toward the surface of the trace, which is known as the skin effect. On top of the natural resistance of copper, if the surface is rough, the current will not travel along a uniform path incurring more resistance and loss.
Evidence
Dielectric loss is driven by the energy absorption nature of the dielectric materials.
Context After
Dielectric materials, resins and glass fiber cloth, provide insulation and mechanical reinforcement function for the PCB traces. At high frequency, high-speed signal doesn’t simply travel through the copper traces, the signal travels as an electromagnetic wave with electric field extending into the dielectric materials.
② Atomic Claim
Dielectric loss 來自 dielectric materials 吸收能量的特性。
- Epistemic Mode:
ASSERTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"frame_type": "CLAIM_ONLY",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"reason": "DIELECTRIC_LOSS_NOT_CANONICALIZED_IN_SOURCE_CLAIM",
"statement": "dielectric loss is driven by dielectric materials absorbing energy."
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| — | — | — |
⑤ Human Review
請在 Properties 逐項確認：
- 原文 → Atomic Claim 是否忠實
- Atomic Claim → Semantic Frame 是否忠實
- Canonical Entity mapping 是否正確
- Epistemic mode 是否保留原文語氣
- 最後選擇
review_action
Review state
Markdown 內文不是正式 approval。只有 Apply bridge 寫入的 Decision Ledger event 才是正式決策。