Coaxial Cable High – Frequency Performance Tested Well - Micro Coaxial Cable factory-(FRS)

In the era of rapid development of 5G communication, satellite navigation, and high – speed data transmission, coaxial cables, as the core medium for signal transmission, face increasingly strict requirements for high – frequency performance. Poor high – frequency performance can lead to signal attenuation, interference, and even system failure. Therefore, in – depth testing of the high – frequency performance of coaxial cables is crucial to ensure the stability and reliability of the entire transmission system.

1. Core Indicators of Coaxial Cable High – Frequency Performance Testing

To accurately evaluate the high – frequency performance of coaxial cables, several core indicators must be focused on, and each indicator directly affects the signal transmission effect in high – frequency scenarios.

1.1 Characteristic Impedance

Characteristic impedance is the inherent impedance of the coaxial cable when transmitting high – frequency signals, and its stability is the basis for ensuring signal matching. If the characteristic impedance fluctuates greatly, it will cause signal reflection, resulting in signal distortion. In the test, we refer to the international standard IEC 60169 – 2, using a vector network analyzer (VNA) to measure the characteristic impedance of the cable in the frequency range of 1 GHz to 18 GHz. The test results show that the characteristic impedance of the tested coaxial cable is stably maintained at 50 Ω ± 2 Ω, which fully meets the requirements of high – frequency communication systems (generally requiring a fluctuation range of no more than ± 5 Ω).

1.2 Attenuation

Attenuation refers to the loss of signal strength when it is transmitted through the coaxial cable. In high – frequency bands, the skin effect and dielectric loss of the cable will be significantly enhanced, leading to an increase in attenuation. We tested the attenuation of the cable at different frequencies (1 GHz, 5 GHz, 10 GHz, 15 GHz, 18 GHz) under the standard environment (temperature 23 ± 2 °C, relative humidity 50 ± 5%). The data shows that at 1 GHz, the attenuation is only 0.15 dB/m; at 10 GHz, the attenuation is 0.42 dB/m; even at 18 GHz, the attenuation is controlled at 0.65 dB/m, which is 15% lower than the industry average level (about 0.76 dB/m at 18 GHz). This low attenuation performance ensures that the signal can be transmitted over a longer distance without obvious strength loss.

1.3 Shielding Effectiveness

In high – frequency environments, external electromagnetic interference (EMI) is very serious, and the shielding effectiveness of the coaxial cable determines its ability to resist external interference and prevent internal signal leakage. According to the ANSI/SCTE 47 standard, we used the reverberation chamber method to test the shielding effectiveness of the cable in the frequency range of 30 MHz to 18 GHz. The test results show that the shielding effectiveness of the cable is greater than 90 dB throughout the frequency band, which means that the external interference signal can be attenuated by more than 10^9 times, effectively ensuring the purity of the transmitted signal.

1.4 Voltage Standing Wave Ratio (VSWR)

VSWR is an important indicator to reflect the degree of signal reflection in the coaxial cable. A lower VSWR indicates better signal matching and less reflection loss. In the test, we connected the coaxial cable to a standard signal source and a load, and measured the VSWR using a VNA. The results show that in the frequency range of 1 GHz to 18 GHz, the VSWR of the cable is always less than 1.2, which is far lower than the industry’s common requirement of ≤ 1.5. This indicates that the cable has excellent signal matching performance in high – frequency bands.

2. Testing Process and Quality Control

The accuracy of high – frequency performance testing of coaxial cables not only depends on advanced equipment but also requires strict control of the testing process.

First, before the test, we conduct a comprehensive inspection of the coaxial cable samples, including checking the integrity of the cable jacket, the tightness of the inner conductor and outer shield, and ensuring that there are no defects such as scratches or kinks on the cable surface. These defects may affect the test results, so unqualified samples are directly excluded.

Then, the testing equipment is calibrated. The vector network analyzer, reverberation chamber, and other equipment are calibrated regularly according to the national metrological standards to ensure the accuracy of the test data. For example, the VNA is calibrated once a month, and the error of the measured data is controlled within ± 0.05 dB.

During the test, the environmental factors are strictly controlled. The temperature, relative humidity, and electromagnetic environment of the test site are kept stable. For example, when testing attenuation, if the temperature changes by more than 2 °C, the test will be suspended until the temperature returns to the standard range. This avoids the impact of environmental factors on the test results.

After the test, the data is analyzed and verified. The test data is sorted and analyzed using professional data processing software, and the consistency of the data is verified. If there is any abnormal data, the test is repeated to ensure the reliability of the results.

3. Significance of Excellent High – Frequency Performance

The excellent high – frequency performance of coaxial cables tested is of great significance for various application fields. In 5G base stations, the low attenuation and stable characteristic impedance of the cable ensure that the 5G signal can be transmitted over a longer distance with high quality, reducing the number of base stations and lowering the construction cost. In satellite navigation systems, the high shielding effectiveness of the cable prevents external electromagnetic interference from affecting the navigation signal, improving the positioning accuracy of the system. In high – speed data centers, the low VSWR of the cable ensures the smooth transmission of large – capacity data, avoiding data loss and delay.

4. Choose FRS for Reliable Coaxial Cables

When you are looking for coaxial cables with excellent high – frequency performance, FRS brand factory is your trustworthy partner. FRS has been committed to the R & D and production of high – performance coaxial cables for more than 10 years. Each coaxial cable produced by FRS undergoes the same strict high – frequency performance testing as described in this article. From the selection of raw materials (high – purity copper conductors, low – loss dielectric materials) to the precision manufacturing process (advanced extrusion technology, tight shielding weaving), FRS strictly controls every link to ensure that each cable has stable and excellent high – frequency performance.

Whether you need coaxial cables for 5G communication, satellite navigation, or high – speed data transmission, FRS can provide you with customized solutions. With a professional R & D team and perfect after – sales service, FRS will escort your signal transmission system. Choose FRS, choose reliable high – frequency coaxial cables.