| 摘要 |
Electronic devices (10) such as cellular phones include radio-frequency transceiver circuitry coupled to an adjustable antenna (40). The adjustable antenna contains conductive antenna structures such as conductive electronic device housing structures (17-1). Electrical components (42-1,42-2,42-3,42-4) such as switches and resonant circuits are used in configuring the antenna to operate in two or more different antenna modes at different respective communications bands. Control circuitry may be used in controlling the switches. The antenna may be configured to operate as an inverted-F antenna in one mode of operation and a slot antenna in a second mode of operation. |
