| 摘要 |
The present invention provides a coupling arrangement for coupling out a RF signal of a transmission line connecting a first and a second RF unit, such like an IQ modulator and a power amplifier. The coupling arrangement comprises first and second coupling means that are adapted to be coupled to respective first and second transmission lines connecting the RF units. The first and second transmission lines separately provide transmission of respective first and second RF signals forming a differential RF signal. Preferably, the first coupling means are adapted to provide coupling out of the first RF signal, thereby inevitably affecting transmission of the first RF signal. The second coupling means provide a substantially equal impact on the transmission of the second RF signal, such that the net impact of first and second coupling means on the differential RF signal nearly vanishes. Hence, an impact of the first coupling means on the transmission of the first RF signal may be completely compensated by means of the impact of the second coupling means on the transmission of the second RF signal.
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