| 摘要 |
The invention is a radio which operates in multiple bands. A radio which operates in n frequency bands in accordance with the invention includes n radio modules (24, 26), each radio module operating in one of the n frequency bands and having an output with an output impedance; and a multiplexer (102) having n inputs and an output with each of the n inputs being coupled to an antenna; and wherein the output impedance of the radio modules is only matched to the impedance of the antenna in its operating band and is mismatched to the impedance of the antenna in the n-1 other frequency bands of the other radio modules and the multiplexer comprises n transmission lines, each transmission line being located in a different input, presenting a matched impedance to the antenna in the operating band of the radio module that it connects to and transforms the output impedance of the radio module in the n-1 other frequency bands to substantially an open circuit.
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