Research Of Periodic Guided Wave Structure

In this Dissertation, electromagnetic characteristics, simulation techniques and engineering applications of periodic guided wave structures are mainly investigated. The current research status and trends of periodic guided wave structures are summarized firstly. Then, by the research of simulation techniques, the electromagnetic characteristics of parallel plate waveguides loaded with periodic substrates are investigated. In engineering applications, electromagnetic bandgap structures, a current research hot spot, are researched.In the first part, the current achievements and existent problems in the periodic guided wave structures are summarized, and the researches in electromagnetic characteristics, simulation techniques and engineering applications are introduced and compared, respectively.In the second part, the electromagnetic characteristics are investigated by the research of simulation techniques. Eigen equations of mode fields in guided wave structures are given in frequency domain firstly. Then, these equations are discritized by two condensed Yee's cell methods. The simulation examples are the parallel plate waveguides loaded with different periodic substrates. From the simulated results, it can be shown that these methods have good accuracy. In this part, the observed complex mode pairs are discussed.In the third part, a ground plane type periodic cell, slotted ground structure, is investigated. First, a microstrip bandstop resonator with slotted ground structure is proposed featuring compactness and suppression of spurious response. Compared with the traditional dumbbell-, H-, and modified dumbbell-shaped slotted ground structures, the size of the proposed structure is reduced greatly. Additionally, the varactor could be embedded in the slot of the ground, so the last resonator would be tunable. Second, a dualband wideband bandpass filter based on slotted ground structure is proposed featuring compactness, broadband, low insertion loss and flexibility to the passbands. By embedding the two special cells each other, a new dualband bandpass filter is gotten. The two passbands could be selected independently. Finally, the slotted ground structure is analyzed by using stepped impedance model. It supplies a gap in the analysis of slotted ground structures in theory. And there are only about 10% relative errors between the theoretic and simulated results.In the forth part, the power/ground structures in high speed circuits are investigated. By analyzing the existence reasons of ground bounce noise, a novelπ-bridged power/ground structure with photonic bandgap is proposed. The ground bounce noise could be suppressed in an ultra wideband from 300MHz to 6GHz, almost the whole noise frequency band. And an improved power/ground structure is proposed to improvethe performance in the lower frequency band further.In the fifth part, we summarize the whole content and propose the future work.