What is the antenna feed?
The
feed antenna feed is a combination of all ingredients that are used for the purposes and transmission of radio frequency waves. The antenna feed can be considered as part of the antenna from the first amplifier to the front end transmitter in the case of the receiving antenna. In the transmission antenna, the antenna feed can be considered part after the last power amplifier. The antenna feed includes radio wave transformation functions into electrical signals and transmission to the receiver components. It is generally considered to be part of an antenna used for the purposes of converting radio waves into electrical signals and vice versa. For this purpose, the antenna feeding must be associated with the resistance of the load. Antenna impedance is a combination of resident, capacity and inductance. Impedance should also be compared to ensure maximum energy transfer conditions - load resistance and feed impedance. Comparison can be made by considering the requirements for frequency and design parameters of the antenna, such as profit, direction and radiation efficiency.
feed impedance includes two resistance elements, which are resistance to loss and resistance to radiation. Resistance to loss is the resistance that offers the actual ingredients of the antenna and feed impedance is the resistance offered at the antenna input to the signal. Therefore, the loss and impedance of the feed must cooperate to achieve the right work antennas. Resistance to radiation is the resistance that the antenna offers radiation power, or in other words, represents distracted radiation power.
efficiency, profit and absolute profit are very important considerations in designing antenna feed. The overall efficiency of the antenna describes losses on the input terminal and through the antenna components. It represents reflection, line and dielectric losses inside the antenna. The gain of the antenna can be considered as the ratio of radiation efficiency to the overall input power. It is a product of efficiency and radiation. Absolute profit is the product of maximum efficiency and directionality. Antenna polarizationIt is also a very important aspect for the design and function of the antenna.