Antenna gain calculation
2021-10-22
Antenna gain calculation 2021-10-22 www.whwireless.com Estimated 6minutes to finish reading Antenna gain is a very important part of the antenna knowledge structure, of course, is also one of the important parameters for the selection of antennas. Antenna gain for the quality of operation of the communication system also plays a big role, in general, the gain is mainly dependent on reducing the width of the vertical-oriented radiation flap, and in the horizontal plane to maintain the omnidirectional radiation performance. A, the definition of antenna gain. Antenna in a certain direction of the radiation power flux density and reference antenna in the same input power when the maximum radiation power flux density ratio. → Need to pay attention to the following points. (1) if not specially marked, antenna gain are referred to the maximum radiation direction gain. (2) Under the same conditions, the higher the gain, the better the directionality, the farther the wave propagates, i.e. the distance covered increases. However, the wave speed width will not be compressed, the narrower the wave flap, thus leading to poor uniformity of coverage. (3) Antennas are passive devices and do not generate energy. Antenna gain is only the ability to effectively concentrate energy to a particular direction of radiation or receive electromagnetic waves. Second, the formula for calculating antenna gain We can learn from the definition of antenna gain, antenna gain and antenna directional map has a close relationship, the narrower the main flap, the smaller the secondary flap, the higher the gain. 5G 4G 8dbi mimo antenna (1) For parabolic antenna, the gain can be approximated by the following equation. G(dBi) = 10Lg{4.5×(D/λ0)^2} *Note that D: paraboloidal diameter λ0: central operating wavelength 4.5: Statistically validated empirical data 2.4 GHz 13 dBi bipolar omnidirectional MIMO antenna - N-type female connector (2) For an upright omnidirectional antenna, the following equation can also be used to approximate G(dBi) = 10Lg{2L/λ0} *Note that L: Antenna length λ0: central working wavelength Third, gain and transmitting power The RF signal output from the radio transmitter, through the feeder (cable) to the antenna, by the antenna in the form of electromagnetic wave radiation out. After the electromagnetic wave reaches the receiving place, it is received by the antenna (only a very small part of the power is received) and sent to the radio receiver through the feeder. In the engineering of wireless networks it is therefore very important to calculate the transmitting power of the transmitter and the radiation capacity of the antenna. The transmitted power of a radio wave is the energy in a given frequency band range and is usually measured or measured in two ways. Power (W): a linear level relative to 1 watt (Watts). Gain (dBm): a proportional level relative to 1 milliwatt (Milliwatt). → The two expressions can be converted to each other. dBm = 10 x log[power mW] mW ...
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