| 摘要 |
A wireless terminal for use in the transmitting and receiving frequency bands of a frequency duplex system comprises transmitting and receiving stages (Tx, Rx) and signal propagating means ( 22, 24, 26 ) coupled to the transmitting and receiving stages. The signal propagating means comprises a narrow band antenna structure ( 24 ), such as a Planar Inverted-F Antenna (PIFA), having sufficient bandwidth to cover the larger one of the transmitting and receiving frequency bands and a BAW receiving filter ( 26 ) and a BAW transmitting filter ( 22 ) coupled by respective feeds to the antenna structure ( 24 ). The filters ( 22, 26 ) enable the antenna structure to have a small volume and be reusable at different FDD frequencies.
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