James T. Aberle

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This paper discusses the implementation of an automatic antenna tuning unit system (ATU) for software-defined and cognitive radio. The ATU simplifies radio frequency (RF) front-end design for multi-band, multi-mode radios by allowing an electrically small reconfigurable antenna to become a frequency-agile selective component (essentially a tunable filter).(More)
This paper proposes a novel RF front-end architecture for software-defined radios (SDRs) based on an electronically tunable antenna pair controlled by an antenna control unit (ACU) consisting of field effect transistor (FET) switches and a field pro-grammable gate array (FPGA). The fundamental gain-bandwidth limitations of electrically small antennas(More)
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