| Summary: | 博士 === 國立臺灣科技大學 === 電機工程系 === 102 === In this dissertation, novel multi-operational mode synthesized transmission lines, capable of providing distinct responses in multiple designated bands, are proposed and investigated. With the help of the multi-mode synthesized lines, a number of miniaturized microwave components and an innovative tri-mode heterogeneous integrated phased array are realized and verified without embedding active switches.
First of all, by introducing dual transmission zeros, synthesized transmission lines with simultaneous slow-wave and harmonic suppression properties are proposed and utilized in the realization of miniaturized Wilkinson power divider, branch-line coupler, and rat-race coupler.
Secondly, two dual-mode right-handed/left-handed synthesized lines are proposed and integrated as a miniaturized diplexer on glass integrated passive device (GIPD) process. Each dual-mode synthesized line creates a transmission channel, along with a transmission zero in the stopband; the input impedance of the synthesized line should be infinite at the transmission zero frequency. Profiting from the dual-mode operation, the diplexer requires no additional matching network, making it feature an extraordinarily compact size and low power dissipation. It shows the smallest circuit footprint among the state-of-the-art designs in open literature.
A number of tri-mode synthesized transmission lines are then proposed to develop a new miniaturized triplexer, which also has the advantages of a very compact size and minimal power dissipation among the reported designs. The tri-mode transmission line can be designed to provide either two passbands with a transmission zero, or a single passband along with two transmission zeros. At the transmission zero frequency, the input impedance of the line must be open-circuited or short-circuited, as well. Rigorous synthesis formulae and design approaches are discussed and summarized, which include the equivalent characteristic impedances and electric lengths of the tri-mode lines in the passbands.
Finally, with the help of the developed tri-mode synthesized lines, an innovative heterogeneous integrated phased array is implemented and experimentally verified. One of the core components is the three-channel selector, whose architecture is similar to the triplexer but with dramatically different functions. Other key components like the tri-mode coupler and diplexer are introduced, as well. The integrated phased array is equivalent to a conventional Butler matrix for beam-switching in the low band, but can automatically switch its topology into a Van Atta array and a phase-conjugating array, respectively, in the mid and high bands for retrodirection. This multi-functional integrated phased array is an original idea that has never been reported in open literature.
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