In the transmission of radio frequency (RF) signals, we always aim to extend the transmission distance as much as possible. To achieve longer transmission ranges, we usually boost the transmitting power of signals to expand communication coverage. Accordingly, there is a demand for coaxial cables that support high-power transmission while keeping signal loss to a minimum.

In the transmission of radio frequency (RF) signals, we always aim to extend the transmission distance as much as possible. To achieve longer transmission ranges, we usually boost the transmitting power of signals to expand communication coverage. Accordingly, there is a demand for coaxial cables that support high-power transmission while keeping signal loss to a minimum.

Back in 1929, Bell Labs conducted extensive experiments and finally found that coaxial cables with characteristic impedances of 30 ohms and 77 ohms deliver optimal performance for high-power transmission and low signal loss respectively. Specifically, 30-ohm coaxial cables feature the maximum power transmission capacity, while 77-ohm coaxial cables have the lowest signal loss. The widely adopted 50-ohm system impedance is an engineering compromise, which strikes a balance between maximum power transmission and minimal signal loss. Practical application also proves that a 50-ohm system impedance achieves excellent impedance matching with the port impedance of half-wavelength dipole antennas and quarter-wavelength monopole antennas, resulting in the lowest reflection loss.

In contrast, television and FM radio receiving systems typically use a 75-ohm system impedance. This is because minimizing signal transmission loss is paramount for these systems. For radio stations equipped with signal transmitters, 50 ohms is the standard matching impedance. These transmitting devices prioritize maximum power transmission while also considering signal loss. This explains why the 50-ohm impedance specification is widely used in Bluetooth, Wi-Fi, walkie-talkies, and other similar communication devices. All products from Texin Electronics are equipped with a 50-ohm impedance to maximize transmitted power.