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2025/06/10

SMA同軸連接器標準規格全解析|頻率、尺寸、材質一次看懂

SMA同軸連接器標準規格全解析|頻率、尺寸、材質一次看懂 

SMA同軸連接器標準規格全解析|頻率、尺寸、材質一次看懂

 

SMA連接器是什麼?為什麼工程師一定要懂它的標準規格?

SMA(SubMiniature version A)同軸連接器是一種廣泛應用於射頻(RF)訊號傳輸的標準連接器,涵蓋無線通訊、測試設備、雷達系統等領域。SMA連接器的標準規格涉及尺寸、阻抗、頻率範圍及機械特性。

選對SMA連接器,不僅能提升訊號穩定度,更能延長設備壽命、避免維修風險。

本文從工程實務出發,深入整理SMA連接器的標準尺寸、電氣性能、材料選擇與應用領域,協助工程師與採購快速掌握挑選關鍵。

 

 

1. SMA連接器的基本規格總覽

SMA連接器的標準規格涵蓋以下機械與電氣特性:

  • 連接方式: 螺紋式(1/4英吋-36螺紋)
  • 阻抗: 50Ω(標準SMA),75Ω(特殊應用)
  • 頻率範圍: DC至18GHz(標準),高頻版本可達26.5GHz
  • 插入力與拔出力: 典型值為2.26至3.4牛頓(N)
  • 插拔壽命: 500至1000次插拔循環
  • 工作溫度範圍: -55°C至+165°C
  • 耐電壓: 1000V(峰值)

 

 

2. SMA連接器的機械尺寸(符合MIL-STD-348B)

為了確保互通性與製造一致性,SMA連接器的尺寸需符合軍規MIL-STD-348B:

 

項目 標準值
外導體直徑 約 4.2 mm
中心導體直徑 約 0.94 mm
螺紋規格 1/4 吋 - 36 UNS
介電間隙 0.05 mm

 

 

3. 材料與表面處理影響連接品質

不同的材質設計會影響連接器的導電性、耐用性、耐腐蝕性:

  • 🔩 外殼材質:黃銅(性價比高)、不鏽鋼(抗壓耐磨)
  • 中心導體:鍍金鋇銅合金,確保低接觸電阻
  • 🔬 介電材料:PTFE(低介電損耗,適用高頻)
  • 💎 表面處理:鍍金(標準)、鍍鎳(耐磨)、鍍銀(特殊訊號需求)

 

 

4. SMA連接器的主要應用領域

因其高頻性能與機械穩定性,SMA廣泛應用於以下場景:

  • 📡 無線通訊:5G基地台、Wi-Fi天線、無線模組連接
  • 🧪 測試量測設備:網路分析儀、高頻探針、示波器
  • 🛩️ 航太軍用系統:雷達、精密導航、衛星連線
  • 🏥 醫療影像:MRI、超音波、高頻治療儀器

 

 

5. 國際標準確保品質與通用性

選用具備國際認證的SMA連接器,有助於確保在各類系統中的可靠性與相容性:

  • MIL-STD-348B:美國軍規尺寸標準
  • IEC 61169-15:國際電工委員會制定的RF連接器規範
  • RoHS / REACH:符合歐盟環保指令,無毒材料保障

 

 

結語:選對SMA連接器,系統更穩定

SMA連接器不只是簡單的“接頭”,它的頻率範圍、材質、尺寸與端接方式都會直接影響你的系統效能。

若您正在為射頻系統挑選連接器,建議從標準規格開始,根據使用環境與頻率需求做出最佳選擇。

 

📣 延伸閱讀
《如何挑選最適合的SMA同軸連接器?從頻率到環境,一次搞懂關鍵選擇要點》

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對規格選擇還有疑問?歡迎寄信至:service@chinnan.com.tw

🛒 立即選購

高品質 SMA 連接器,快速出貨、技術支援 → 點此前往 SMA 商品頁面

 


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