Raytron Technical Review RESEARCH ARTICLE cca-coaxial-rf

CCA同轴电缆射频性能优化

CCA for Coaxial Cables: RF Performance Optimization

RAYTRON技术团队¹ *

¹RAYTRON集团技术研究中心, 中国

^*通讯作者

收稿: 2025年12月接受: 2026年2月发布: 2026年3月

DOI: 10.1234/raytron.2026.WP-02-06

1. 引言

CCA广泛用作同轴电缆的中心导体。

1.1 CCA为何适用于射频

在射频频率下：电流在表面附近流动（趋肤效应），铜包覆层承载电流，铝芯提供结构支撑。

2. 趋肤效应基础

2.1 趋肤深度

创建趋肤效应示意图

MEDIA TODO

Figure Fig. 1 趋肤效应示意图

δ = √(ρ/πfμ)

(1)

2.2 有效导电深度

对于有效射频导电：t_effective ≈ 3-4 × δ

1 GHz最小铜厚度：~8-10 μm

创建铜厚度与频率关系图

MEDIA TODO

Figure Fig. 3 铜厚度与频率关系

3. 衰减性能

3.1 衰减对比

创建衰减对比曲线

MEDIA TODO

Figure Fig. 2 衰减对比曲线

4. 设计优化

5. 应用指南

6. 结论

CCA在同轴电缆应用中提供与实心铜等效的射频性能，同时具有成本和重量优势。

常见问题

Why is CCA suitable for RF applications?

At radio frequencies, skin effect causes current to flow primarily in the outer copper cladding. Since the aluminum core carries minimal current, CCA performs nearly identically to solid copper while offering significant weight and cost advantages.

What is skin effect and why does it benefit CCA?

Skin effect is the tendency of high-frequency current to concentrate near the conductor surface. At 100 MHz, skin depth is only 6.6 μm in copper. CCA's copper cladding carries this surface current effectively, making the aluminum core structurally rather than electrically important.

How much attenuation difference exists between CCA and copper coax?

CCA coaxial cables typically show 3-8% higher attenuation than solid copper equivalents, with the difference decreasing at higher frequencies. For most applications (CATV, satellite, CCTV), this difference is negligible.

What minimum copper thickness is needed for RF?

For effective RF conduction, copper thickness should be 3-4 times the skin depth. At 1 GHz, this means approximately 8-10 μm minimum. Most CCA coaxial cables exceed this requirement significantly.

图表

创建趋肤效应示意图

Fig. 1 趋肤效应示意图

创建衰减对比曲线

Fig. 2 衰减对比曲线

创建铜厚度与频率关系图

Fig. 3 铜厚度与频率关系

表格

Table 1 CCA同轴应用

应用	CCA使用	原因
CATV入户	主导	成本+高频性能
卫星电视	常见	重量+成本
CCTV	常见	成本效益
射频测试电缆	优质	性能+成本

Table 2 趋肤深度

频率	Cu δ (μm)	Al δ (μm)	电流深度
1 MHz	66	85	3-4× δ
10 MHz	21	27	表面主导
100 MHz	6.6	8.5	很薄
1 GHz	2.1	2.7	最小厚度

Table 3 最小铜厚度要求

频率	电流位置	所需铜厚度
<1 MHz	部分在芯材	显著
1-100 MHz	主要在包覆层	中等
>100 MHz	几乎全部在包覆层	薄层足够

Table 4 衰减对比(RG-6)

频率	Cu (dB/100m)	CCA (dB/100m)	差异
10 MHz	1.2	1.3	+8%
100 MHz	4.0	4.2	+5%
500 MHz	9.5	9.8	+3%
1 GHz	14.0	14.5	+4%

参考文献

Pozar, D. M. Microwave Engineering (4th ed.) Wiley (2011)
SCTE SCTE Standards for Coaxial Cable SCTE (2020)

权威参考链接

ASTM International IEC (International Electrotechnical Commission) ISO (International Organization for Standardization) SAE International IEEE

CCA同轴电缆射频性能优化

CCA for Coaxial Cables: RF Performance Optimization

1. 引言

1.1 CCA为何适用于射频

2. 趋肤效应基础

2.1 趋肤深度

2.2 有效导电深度

3. 衰减性能

3.1 衰减对比

4. 设计优化

5. 应用指南

6. 结论

常见问题

Why is CCA suitable for RF applications?

What is skin effect and why does it benefit CCA?

How much attenuation difference exists between CCA and copper coax?

What minimum copper thickness is needed for RF?

图表

表格

参考文献

权威参考链接

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