This letter proposes a novel calibration method for a multiport amplifier (MPA) to achieve optimum port-to-port
I. IntroductionModern satellite communication systems generally adopt various techniques to increase the flexibility of the antenna and the power allocation of their coverage [1]. To adaptively control communication traffic during the lifetime of a satellite, using an architecture based on the multiport amplifier (MPA) is an effective approach in multibeam systems. The theoretical analysis of an MPA with respect to classical power amplification architectures reflects that it has lower DC power consumption with lower saturation power amplifiers (PAs) [2].In this case, the isolation characteristic among the output ports of the MPA is important for successful operation. A fair port-to-port isolation characteristic can be achieved by Manuscript received Dec. 1, 2012; revised Feb. 2, 2013; accepted Feb. 12, 2013. Seong-Mo Moon (phone: +82 42 860 0862, smmoon@etri.re.kr), Dong-Hwan Shin (dhshin@etri.re.kr), Hong-yul Lee (hylees@etri.re.kr), Man-seok Uhm (msuhm@etri.re.kr), and In-Bok Yom (ibyom@etri.re.kr) are with the Broadcasting
plane cross-polarization of the antenna is quite high especially at Ϸ 60°(theoretical) and Ϸ 40°(measured), it is about Ϫ16 dB at 1.8 GHz, while the E-plane cross-polarization is very low. This is mainly due to the infinite ground plane assumption used in the calculation.
CONCLUSIONS
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