App Description
When the antenna input impedance and the characteristic impedance of the feeder are inconsistent, the generated reflected wave and the incident wave are superimposed on the feed line, and the ratio of the maximum value to the minimum value of the adjacent voltage is the voltage standing wave ratio, which is to check the transmission efficiency of the feeder basis.
The voltage standing wave ratio is less than 1.5, and the voltage standing wave ratio at the operating frequency is less than 1.2.
If the voltage standing wave ratio is too large, the communication distance will be shortened, and the reflected power will return to the power amplifier part of the transmitter, which will easily burn out the power amplifier tube and affect the normal operation of the communication system.
When the voltage standing wave ratio is equal to 1, it means that the impedance of the feeder and the antenna are completely matched. At this time, the high-frequency energy is completely radiated by the antenna, and there is no reflection loss of energy.
When the standing wave ratio is infinite, it means total reflection, and the energy is not radiated at all.
iPhone Screenshots
(click to enlarge)
App Changes
- September 21, 2018 Initial release