What are the RF properties of coaxial cable

How much do you know about coaxial cable? When you talk about coaxial cable, you will talk about the RF properties of coaxial cable. Do you know what the RF properties of coaxial cable are?The Konnra Connectors engineer will focus on introducing the RF properties of coaxial cables to you. We hope that you can master the RF properties of these coaxial cables through our explanation.
RF cable
The RF properties of coaxial cable mainly include six aspects: characteristic impedance, parasitic capacitance, transmission loss, transmission delay, return loss and rated power. The specific contents are as follows:
1. Characteristic impedance of coaxial cable
It is an equivalent parameter in theoretical calculation, which reflects the measurement of the resistance degree of RF signal transmission when the wire transmits RF signal, and reflects the signal loss and signal delay of the transmission line at the physical level.When the characteristic impedance of each part of the coaxial cable is consistent, the signal energy can be maximized for transmission. If the characteristic impedance is discontinuous, the reflection loss of RF signal energy will occur. The size of end-to-end source impedance and load impedance should also be consistent with the characteristic impedance to ensure the maximum transmission of signal power.
2. Parasitic capacitance of coaxial cable
Because of coaxial line inner conductor, dielectric, and the existence of the outer shield is a transmission line's ability to store electrical charge, so the signal present certain effect of capacity, the size of the capacitance can limit the maximum working frequency of transmission lines can transport, so in the high frequency applications, should pay attention to the length of the transmission line and the size of the parasitic capacitance of the high frequency signal attenuation.
3. Transmission loss of coaxial cable
Transmission loss is one of the important RF properties of coaxial cables. Due to the dc resistance of conductors and the effect of high frequency convergence, the transmission line has a certain heat loss to the signal. The longer the transmission line, the greater the loss.
RF cable
4. Transmission delay of coaxial cable
Due to the existence of the dielectric in the transmission line, there is a certain delay in the transmission of high-frequency signals in the dielectric, and the delay is different for signals of different frequencies. Therefore, when transmitting broadband high-frequency signals, it is necessary to pay attention to the influence of transmission delay.
5. Return loss of coaxial cable
Because the manufacturing process, quality of a transmission line is different, it can appear the characteristic impedance of inconsistent and discontinuity of the situation, in this way, will lead to the RF signal reflection loss, this is because the wire return loss caused by insufficient ideal, just based on the coaxial line the quality of the product itself, loss will exist a certain differences.
6. Rated power of coaxial cable
Conductive resistance and high frequency skin effect will make coaxial cable in high power high frequency signal transmission, makes its own fever, dielectric breakdown risk have been at the same time, RF coaxial wire is an affordable transmission power, under the condition of the transmission power, RF coaxial wire can be normal use, more than the power limit, coaxial line failure may occur.


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