The normal zero-IF topology with the single quadrature channels is very sensitive to the phase-error of the phase-shiftnetwork of LO.
驻极体传声器目前主要是民用,单指向性驻极体传声器设计与生产的关键在于内部相移网络的控制。
2
"China's 3g rollout will still be in its early phase in 2011, but the focus of attention will continue to shift away from expanding network coverage and toward increasing network affordability."
The excitation network comprises hybrid elements so as to introduce a certain phaseshift between the radiating elements allowing a dual circular polarization.