Some antennas, such as chip antennas, have either low or high impedance when fabricated. The need for impedance matching techniques in antennas comes from the fact that antenna impedances are not always 50 Ohms. Impedance Matching Techniques in Antennas: Defining Impedance Matching Requirements Starting from a filtration perspective is the easiest impedance matching technique in antennas or other RF circuit elements. Impedance matching circuits are rather simple they act like filters that ensure an antenna’s feedline impedance matches the input impedance at the input port of the antenna. Impedance matching techniques for antennas are intended to ensure maximum power transfers into the antenna so that the element can radiate strongly.Īntenna impedance matching involves matching the input impedance at the end of the antenna’s feedline to the feedline’s characteristic impedance.įilter circuits are normally used, as they can be configured to provide specific impedance right at the desired transmission frequency.Īlthough antennas come in a variety of shapes and sizes, they have one thing in common: they need to have impedance matching enforced at the end of the feedline to ensure maximum power transfer into the load.
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