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Microwave Bandpass Filters for Wideband Communications

by Rui Li Sheng Sun Lei Zhu

This book will appeal to scientists and engineers who are concerned with the design of microwave wideband devices and systems. For advanced (ultra)-wideband wireless systems, the necessity and design methodology of wideband filters will be discussed with reference to the inherent limitation in fractional bandwidth of classical bandpass filters. Besides the detailed working principles, a large number of design examples are demonstrated, which can be easily followed and modified by the readers to achieve their own desired specifications. Therefore, this book is of interest not only to students and researchers from academia, but also to design engineers in industry. With the help of complete design procedures and tabulated design parameters, even those with little filter design experience, will find this book to be a useful design guideline and reference, which can free them from tedious computer-aided full-wave electromagnetic simulations. Among different design proposals, wideband bandpass filters based on the multi-mode resonator have demonstrated many unparalleled attractive features, including a simple design methodology, compact size, low loss and good linearity in the wide passband, enhanced out-of-band rejection, and easy integration with other circuits/antennas. A conventional bandpass filter works under single dominant resonant modes of a few cascaded transmission line resonators and its operating bandwidth is widened via enhanced coupling between the adjacent resonators. However, this traditional approach needs an extremely high coupling degree of coupled-lines while producing a narrow upper stopband between the dominant and harmonic bands. As a sequence, the desired dominant passband is restricted to an extent less than 60% in fractional bandwidth. To circumvent these issues and break with the tradition, a filter based on the multiple resonant modes was initially introduced in 2000 by the first author of this book. Based on this novel concept, a new class of wideband filters with fractional bandwidths larger than 60% has been successfully developed so far. This book, presents and characterizes a variety of multi-mode resonators with stepped-impedance or loaded-stub configurations using the matured transmission line theory for development of advanced microwave wideband filters.

Trees Without Wind

by John Balcom Rui Li

Born in Beijing in 1950, the experimental writer Li Rui came of age in the thick of the Cultural Revolution. His experiences shaped not only his perception of China's unraveling but also his novelistic style. Combining the stylistic innovations of Modernist literature, particularly a Faulknerian play with dialogue and form, and content and language drawn from rural China, Li Rui's writing captures the harsh reality of a world turned upside down by ideological conflict.Unfolding in the tense years of the Cultural Revolution (1966-1976), Trees Without Wind takes place in a remote Shanxi village in which a rare affliction has left the residents physically stunted. Director Liu, an older revolutionary and local commune head, becomes embroiled in a power struggle with Zhang Weiguo, a young ideologue who believes he is the model of a true revolutionary. Complicating matters is a woman named Nuanyu, who, like Zhang Weiguo and Director Liu, is an outsider untouched by the village's disease. "Wedded" to all of the male villagers, Nuanyu lives a polygamous lifestyle that is based on necessity and at odds with the puritanical idealism of the Cultural Revolution. The deformed villagers, representing the manipulated masses of China, become pawns in the Party representatives' factional infighting. Director Liu and Zhang Weiguo's explosive tug of war is part of a larger battle among politics, self-interest, and passion gripping a world undone by ideological extremism. A collectively-told narrative powered by distinctive subjectivities, Trees Without Wind is a milestone in the fictional treatment of this historical event.

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