An Impulse-Radio-Based Ultrawideband Rf Front-End Module With a New Multilayered Microwave Sampler

In this paper we develop a new impulse-radio-based RF front-end module for ultrawideband communications.The proposed transceiving module is designed based a novel compact microwave sampler.The microwave sampler consists of a multilayered magic-T and a balanced sampling bridge.By utilizing a wideband microstripto-slotline Marchand balun, the newly proposed magic-T features an improved bandwidth of 94.2%.The design concept, circuit topology, and experimental results of the magic-T and microwave sampler are investigated in the first half of this paper.By utilizing the equivalent time sampling theory, in the second half of this paper we investigate an impulse-radio-based ultrawideband transceiving front-end module.Two transmission data rates, 90 and 270 Kbps, are demonstrated with various bit patterns.The experimental results reveal that the transceiving module has a coverage range up to 4.5 m.The circuit configuration, modulation scheme, and system performance of the front-end module are discussed thoroughly.The tradeoff for increasing the data rate is discussed at the end of this paper as well.