SB (Strip Braid) Coaxial Cable

SB316 SB142 SB142i SB400 SB304 SB393

Construction: Dielectric: solid PTFE

Inner braid: flat silver plated copper strip

Interlayer: aluminum polimide polyester tape

Outer braid: round silver plated copper

Jacket: FEP, translucent colors, solid colors or clear

Operating temperature: -55 +200° C

Velocity of Propagation: 70%

Impedence: 50 Ohms

Capacitance: 29.4 pF/ft

Shielding Effectiveness: <-95 dB

Harbour’s SB coaxial cables have been designed for low attenuation at high frequencies, while using similar dimensions to MIL-DTL-17 constructions. Standard connectors may frequently be used, thereby avoiding tooling charges.

Solid PTFE dielectrics are manufactured with tight tolerances to ensure impedance uniformity and to effect VSWR levels that meet or exceed MIL-DTL-17 specifications for cables of comparable size. The strip braid configuration is by far the most effective means of lowering attenuation levels of coaxial cable at high frequencies while providing shielding effectiveness levels that exceed those of flexible MIL-DTL-17 cables. Flat strips of silver plated copper are braided over the dielectric core, frequently with an intermediate metallized mylar or kapton layer, and an outer round wire braid. This shielding technique provides superior shielding effectiveness and lower transfer impedance than any standard double braided mil-spec construction.

FEP jackets are typically used, but alternate designs are available such as flame retardant PVC and abrasion resistant overall braids. Marker tapes or surface printing are used for positive identification.

The chart on the following page outlines just a few designs Harbour manufactures. Some of the more popular constructions are standard stock items, and many additional cables are available for prototype assemblies. Many cables not referenced have been designed to meet specific customer requirements.

Attenuation Calculation and K Factors Although typical and maximum attenuation values are given for discrete frequencies, typical attenuation values may be calculated by using K1 and K2 factors for each construction. The K1 factor is calculated by taking into consideration the type, strand factor, and diameter of the center conductor, and the impedance of the cable. The K2 factor is calculated by taking into consideration the velocity of propogation and the dissipation factor of the dielectric.

SB（帶編織）同軸電纜
SB316 SB142 SB142i SB400 SB304 SB393
結構：絕緣：固體PTFE
內蒙古編織：平鍍銀銅條
中間層：鋁polimide聚酯膠帶
外編織：圓鍍銀銅
外套：FEP，半透明色，純色或透明
工作溫度：-55 + 200℃
傳播速率：70％
阻抗：50歐姆
電容：29.4前鋒/英尺
屏蔽效能：<-95分貝

Harbour的SB同軸電纜已被設計為在高頻低衰減，同時使用類似的尺寸符合MIL-DTL-17的結構。標準的連接器可能會經常被使用，從而避免模具的費用。

固體電介質的PTFE與嚴格的公差製造，以確保阻抗的均勻性和以實現滿足VSWR水平或超過MIL-DTL-17規格可比尺寸的電纜。條帶編織結構是通過降低同軸電纜的衰減水平在高頻率，同時提供超出這些柔性MIL-DTL-17電纜屏蔽效果的水平的最有效的手段。的鍍銀銅扁平帶編織在電介質芯，經常與中間的金屬化的聚酯薄膜或聚酰亞胺薄膜層，和一個外圓形金屬絲編織。這種屏蔽技術提供卓越的屏蔽效能和較低的傳輸阻抗比任何標準的雙編軍用規範建設。

FEP外套通常使用，但備用設計，可如阻燃PVC耐磨整體辮子。標記磁帶或表面印刷用於陽性鑑定。
圖表下頁上列出只是一些設計港生產。一些比較流行的結構是標準的庫存物品，以及許多額外的電纜可用於原型組件。未引用許多線纜的設計，以滿足特定客戶的要求。

衰減計算與雖然典型和最大衰減值K係數是給出了離散頻率，典型的衰減值可通過使用K1和K2因子為每個施工來計算。該K1因子由考慮到的類型，鏈因子，以及中心導體的直徑，電纜的阻抗計算出的。 K2的係數是通過考慮到傳播史的速度和電介質的損耗因數計算出的。