| In this dissertation, two novel design architectures utilizing either a periodic structure or an active integrated antenna (AIA) for harmonic tuning in transmitter front-end designs will be first presented. These techniques promise to significantly improve the power amplifier efficiency, reduce losses and weight, as well as maintaining good linearity requirements of advanced wireless communication systems. These two concepts will be illustrated through several design examples that have been developed recently. At the end of this dissertation a new power combining scheme, which has either one or four amplifiers on depending upon the levels of input signal will be introduced. This approach is realized by utilizing a unique combiner that is lossless and has constant gain under both scenarios. As a result, for the system where variable output power is required, this combining scheme can be used in an amplifier design with optimum efficiency. |
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