VR2R-0308
① SA Source
- Source: 開啟完整 SA 文章
- Section:
PCB vs Flyover Cables - Line hint:
276
Context Before
Dielectric loss is driven by the energy absorption nature of the dielectric materials. Dielectric materials, resins and glass fiber cloth, provide insulation and mechanical reinforcement function for the PCB traces.
Evidence
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.
Context After
As the signal propagates, the dielectric absorbs a portion of the energy and dissipates as heat, contributing to insertion loss. Dielectric loss scales with frequency, hence dielectric loss is a dominant limiter of signal performance of long reach PCB traces.
② Atomic Claim
在高頻下，high-speed signal 不只是沿 copper traces 傳輸，而是以 electromagnetic wave 形式傳播，其 electric field 會延伸進 dielectric materials。
- Epistemic Mode:
ASSERTED - Mapping Status:
PARTIAL
③ Semantic Frame
{
"frame_type": "CLAIM_ONLY",
"qualifiers": {
"condition_text": "high-frequency condition",
"numeric_mentions": [],
"temporal_mentions": []
},
"reason": "ELECTROMAGNETIC_PROPAGATION_CONCEPTS_NOT_CANONICALIZED_IN_SOURCE_CLAIM",
"statement": "at high frequency, high-speed signals propagate as electromagnetic waves with electric fields extending into dielectric materials."
}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。