| 摘要 |
<p>A wireless communication unit (200) includes a transmitter (220) for generating a transmit radio signal and an antenna (202), operably coupled to the transmitter (220), for radiating the radio signal. An isolator circuit (226) is operably coupled between the transmitter (220) and the antenna (202) and includes a first directional coupler (310) providing a first transmission path for routing a first portion of the transmit signal and a second transmission path (320) for routing a second portion of the transmit signal. A second coupler (340) is operably coupled to the first directional coupler (310), for combining the first portion of the transmit signal and the second portion of the transmit signal and providing a combined transmit signal to the antenna (202). A radio frequency transmitter integrated circuit is also described.</p><p><Paragraphs id="pa02" num="0002" xmlns:base="http://www.sipo.gov.cn/XMLSchema/base">In this manner, by provision of a first directional coupler and a second coupler between the transmitter and the antenna, a return path to the transmitter for signals reflected at the antenna has acceptable isolation, with minimised insertion loss.
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