A cordless phone antenna, responsible for transmitting and receiving radio signals, typically presents a low impedance to the connected circuitry. Impedance, a measure of opposition to alternating current flow, is a broader concept than just resistance, encompassing both resistance and reactance. While a high direct current resistance could indicate a fault or open circuit, the operative characteristic concerning signal transmission is the antenna’s impedance at the operational frequency. An improperly matched impedance will lead to signal reflections and reduced transmission efficiency.
Efficient radio communication relies on effective impedance matching between the transmitter, antenna, and receiver. A mismatch results in a portion of the signal being reflected back towards the source, reducing the power radiated. This, in turn, diminishes the effective range and signal quality. Historical antenna design has always focused on optimizing impedance matching to maximize signal strength and minimize losses. Modern cordless phone designs continue to emphasize this, employing sophisticated matching networks to ensure optimal performance.