| 摘要 |
There is disclosed an active impedance matching network for an electrically-small antenna. The network may include a plurality of negative impedance converters (NICs) 1-4 individually connectable between a transceiver 6 and the antenna 5. Each of the NICs is respectively configured for optimum performance at a respective different power output of the transceiver. Switches 200-203, 100-103 are used to select the appropriate NIC, based on the transmit power. Alternatively, the network may include a negative impedance converter (10, Fig. 9) with a bias voltage (11, Fig. 9) which is controlled based on the power output of the transceiver. |
