H-shaped patch antenna was used. The load matching network was designed so that the 50 ⍀ passive load in the PA circuit could be replaced by the antenna. A measured PAE of 67.5% and a very good harmonic suppression at the second and third harmonics was obtained. In the second AIA design, to further minimize the size, cost, and losses, direct integration between the antenna and the PA has been proposed. For this design optimum load impedances at the fundamental frequency and second harmonic were obtained by adjusting the antenna probe feed position and the length of the drain bias network. An increased in PAE to 68.2% was obtained which is a little higher than obtained in the first AIA design. The simulated results for both circuits show good agreement with the measured results. ACKNOWLEDGMENTThe authors acknowledge the assistance of and discussion with Dr. Dave Smith and Dr. Wai Pang Ng. VECTOR SEQUENCE ACCELERATOR FOR SOLVING PROBLEMS IN COMPUTATIONAL ELECTROMAGNETICS USING THE METHOD OF MOMENTS

The generation of RF/microwave power is required not only in wireless communications, but also in applications such as jamming, imaging, RF heating, and miniature dc/dc converters. Each application has its own unique requirements for frequency, bandwidth, load, power, efficiency, linearity, and cost. RF power is generated by a wide variety of techniques, implementations, and active devices. Power amplifiers are incorporated into transmitters in a similarly wide variety of architectures, including linear, Kahn, envelope tracking, outphasing, and Doherty. Linearity can be improved through techniques such as feedback, feedforward, and predistortion.

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