Characteristics of ONU antenna

Antenna gain: The gain coefficient is a parameter that comprehensively measures the energy conversion and directional characteristics of the antenna. Its definition is:
The product of directional coefficient and antenna efficiency is denoted as: D is the directional coefficient and is the antenna efficiency. It can be seen that the higher the sum of antenna directional coefficients, the higher the gain coefficient. And its physical significance: the gain coefficient of the antenna describes the multiple times that the antenna amplifies its output power in the maximum radiation direction compared to an ideal directionless antenna. It can also be popularly understood as the ratio of a directional antenna to an ideal omnidirectional antenna (whose radiation is equal in all directions) generating a signal of a certain size at a certain point in a certain distance. Antenna efficiency: Antenna efficiency is defined as the ratio of antenna radiation power to input power.
The radiation resistance R of commonly used antennas is used to test the ability of antennas to radiate power. The radiation resistance of antennas is a virtual quantity defined as follows: with a resistor R, when the current passing through it is equal to the maximum current on the antenna, the power lost is equal to its radiation power. Obviously, the level of radiation resistance is an important indicator to measure the radiation ability of an antenna, that is, the larger the radiation resistance, the stronger the radiation ability of the antenna.
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