Application Of Multiresolution Time Domain Technique On ACPW

Coplanar waveguide (CPW) is widely used in microwave, millimeter-wave, optical and high temperature superconductor microwave devices as a kind of important planar transmission line. The microstrip is replaced by CPW in some kind of circuits, and CPW is taking more important rule in microwave integrated circuit. Asymmetric Coplanar Waveguide (ACPW) is a new kind of transmission line originated from CPW. Compared to CPW, ACPW is more common and flexible with the reason that the slotline width of ACPW is different.Although there are many researches about CPW, the theory and application researches for ACPW are little owing to the restriction of test condition and actual application experience. Base on the computational electromagnetics, the characteristic impedance and dispersion of ACPW are computed and analyzed with multi-resolution time domain technique (MRTD) for theory researches of ACPW. The alternating direction implicit (ADI) technique is applied to improve the MRTD method in order to solve the restriction of time step, and artificial network is applied to further improve the MRTD method with avoiding disadvantage of MRTD in dealing with absorbing boundary.CPW can be used as transmission line or to make some kinds of microwave passive devices in aspect of actual application. However, the overall layout of microwave devices is restricted because that the slot width of CPW must be same. The layout of microwave devices may be flexible with ACPW getting rid of the restriction. The better performance will be obtained easily because the degree of freedom of ACPW is better than CPW when microwave devices are optimized. Novel ACPW filters used in MEMS system are presented by means of the advantages of ACPW to replace inductor and capacitance in MEMS system. A ultra-wideband ACPW filter is fabricated and measured with a vector network analysis. And a novel ACPW/microstrip transition is given in order to transit from ACPW to microstrip.