Analyze the signal loss of coaxial cable

Coaxial cable procurement telephone: 400-6263-698, welcome to purchase. In general, when coaxial cable transmits data signals, it will continuously lose signals, which will lead to the decrease of amplitude after the signal reaches the end point, and sometimes it will fail to meet the normal operating requirements. Deso Industrial Defense Division pointed out that the factors affecting signal loss involve resistance resistance loss, dielectric loss, mismatch loss and leakage loss. Now let's make a systematic analysis of these loss factors. I believe you can have a deeper understanding after reading them Coaxial cable The signal is lost.

1. Resistance loss

Resistance loss refers to the consumption of signal energy by the DC resistance of cable and eddy current caused by high-frequency induction of conductor. The resistance value is related to the raw materials and production process used for the cable. At the same time, it will change with the change of transmission frequency, because the conductor has skin effect in the transmission of AC signals. With the increase of frequency, the effective resistance will continue to increase.

2. Dielectric loss

Dielectric loss is the loss of signal caused by the dielectric (insulator) between the central conductor and the outer conductor of the coaxial cable. An important parameter for measuring dielectric is dielectric constant. It refers to the ratio of the capacitance when a certain substance is used as the dielectric in the same capacitor to the capacitance when it is vacuum, which is called the "dielectric constant" of the substance. The dielectric constant usually varies with temperature and the frequency of electromagnetic waves propagating in the medium.

3. Mismatch loss

Mismatch loss is mainly related to the physical structure of coaxial cable. If the coaxial cable breaks away from the nominal impedance or the cable impedance is uneven in the design and production, it will lead to the mismatch loss of the signal. During construction, excessive bending, deformation, damage of cables and water ingress of joints will also cause mismatch loss.

4. Leakage loss

Leakage loss is the signal radiated from the braided gap of the cable shield. It also causes the energy loss of the signal in the transmission process. It is an important problem in high frequency transmission. Therefore, the braiding coverage of the cable cannot be too low.

about Connector This is the end of the coaxial cable signal loss analysis. In a word, the DC resistance of the cable only plays a major role in signal attenuation at low frequencies; At high frequencies, signal attenuation is mainly determined by skin effect and dielectric loss. With the increase of coaxial cable transmission signal frequency, the signal attenuation increases exponentially. Therefore, the transmission loss of the cable is important to consider the high-frequency loss. Of course, in addition to the design, production and processing of cables, improper construction in use will also have a significant impact on the normal use of cables.

Deso Electronics is a professional coaxial cable RF Connector The manufacturer, with 15 years of production experience, can help users quickly solve various problems in the production of coaxial cables. What are you hesitating about? If you are considering cooperating with a RF coaxial cable manufacturer, please call 400-6263-698 for free consultation. The pictures used in the article "Analysis of coaxial cable signal loss" are all high-definition pictures of our products, which are only for our customers' free reference. Please do not copy them for commercial purposes. Thank you for your cooperation.

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