Standing wave ratio is a number used to indicate whether the antenna and the radio transmitter match. If the SWR value is equal to 1, it means that the transmitted wave has no reflection at all and is emitted to the antenna, which is the ideal situation. If SWR is greater than 1, a portion of the wave is reflected back, eventually turning into heat and heating the feeder. The reflected waves can also generate a considerable voltage at the transmitter outlet, potentially damaging the transmitter.
The load is equal to the reference voltage standing wave ratio =1
The standing-wave ratio cables are mainly used for Notebook, mobile phone, GPS, measuring instrument, bluetooth technology, etc.
Test graph (standing wave ratio)
When the signal on the transmission line transmission, because of the influence of the process instability, uneven places in impedance will form a reflection, the incident wave and reflected wave on transmission line, the incident wave and reflected wave voltage amplitude phase of the same place together for maximum voltage amplitude Vmax, while the incident wave and reflected wave phase instead of local voltage amplitude subtraction for minimum voltage amplitude Vmin, maximum voltage amplitude Vmin Vmax and minimum voltage amplitude ratio is called voltage standing wave ratio.