Study of bias networks with RF choke for ultra-wideband systems

• In this letter, bias networks with three different radio frequency chokes for ultra-wideband systems have been studied. The bias network with a butterfly stub results in not only the broadest band, but also the highest robustness. Resonances generated within the DC path of the bias network are investigated and explained. Both simulation and experimental results show that microstrip bias networks for ultra-wideband systems can be optimized to avoid or reduce the resonance phenomena.

Nyckelord

Amplifier

bias network

broadband

butterfly radial stub

microstrip

RF-choke

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