MULTI-BAND RECEIVING ACTIVE ANTENNA USING ACTIVE ANTENNA IMPEDANCE MATCHING CIRCUIT

摘要

PURPOSE: An active antenna for receiving a multiband by using an active antenna impedance matching circuit is provided to reduce a manufacturing cost of an antenna by reducing limits on a shape and a size of an antenna for receiving standards. CONSTITUTION: A manual antenna(101) receives a signal of various frequency bands. The manual antenna is formed with a length shorter than a resonant length corresponding to the lowest frequency band among use frequency bands. An active matching circuit unit(102) amplifies the signal received from the manual antenna. An input terminal(102a) of the active matching circuit unit offsets the imaginary part impedance of the manual antenna. An output terminal(102b) of the active matching circuit unit is matched with the input impedance of a receiver(110) having every set band of 50. [Reference numerals] (102) Active matching circuit unit; (110) Receiver