| 摘要 |
A multimode front end for a wireless communication apparatus, which communication apparatus is arranged for at least time division duplex, TDD, and frequency division duplex, FDD, types of signals, the front end comprising a reception chain (RX) for processing received FDD and TDD signals; a transmission chain (TX) for creating FDD and TDD signals to be transmitted; transmission means (5, 6) for receiving and transmitting signals; and a duplex filter (4, 10, 22) for filtering the FDD transmission band and FDD reception band and for separating them from each other, which duplex filter is functionally connected to the transmission means (5, 6), reception chain (RX) and transmission chain (TX). The invention is characterized by at least one pair of TDD reception filter-TDD transmission filter (24, 27; 25, 23), which filters are arranged on a common frequency band and functionally connected to the transmission/reception means (5, 6), the TDD reception filter (24, 25) being functionally connected to the reception chain (RX) and the transmission chain (RX) being functionally connected to the TDD transmission filter (23, 27).
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