无线功率mW 和dBm 的换算(国外英文资料).docVIP

无线功率mW 和dBm 的换算(国外英文资料) The transmitting power of the launcher and the radiation capability of the antenna are calculated Radio frequency signals transmitted by a radio transmitter are transmitted to an antenna via a feeder (cable) and radiated by an antenna in the form of an electromagnetic wave. electromagnetism When the wave reaches the receiving site, it is received by the antenna (only a small fraction of the power is received) and sent to the radio receiver via a feeder. Therefore, in the wireless network engineering, it is very important to calculate the transmitting power of the launcher and the radiation ability of the antenna. Tx is a short for launch (Transmits). The emission power of radio waves refers to the energy within a given frequency range. There are usually two measurements Measurement standard: 1, power (W): relative to 1 watts (Watts) linear level. For example, the transmit power of the WiFi wireless network card is usually 0.036W, or People say 36mW. 2, gain (dBm): relative to 1 MW (milliwatt) of the proportional level. For example, the WiFi wireless card has a transmit gain of 15.56dBm. Conversion of power units mW and dBm: 1, dBm = 10, x, log [power mW] 2, mW = 10 [gain dBm / 10 dBm] In wireless systems, antennas are used to convert current waves into electromagnetic waves, which can also be used to transmit and receive signals during conversion This measure of energy magnification becomes Gain. The measure of antenna gain is dBi. Because of the power in the wireless system The energy of the magnetic wave is produced by the transmitting energy of the transmitting device and the amplification and superposition of the antenna. Therefore, the measurement of emission energy is the best one of the same measure gain (dB) for example, the power of the transmitting device is 100mW or 20dBm; the gain of the antenna is 10dBi; otherwise: Total emission energy = transmit power (dBm) + antenna gain (dBi) 20dBm10dBi = = 30dBm Or = = 1000mW = 1W In a smal