FDTD ANALYSIS ON PBG VIA STRUCTURES PRINTED ON CPW LINES

摘要

There have recently been a number of studies on thephotonic band-gap (PBG) structures in microelectronicsand communications areas. In most of the studies, thePBG filtering behaviour was fulfilled by a periodicpattern of perforations on the ground planes of microstriplines. However, similar band-gap characteristics can alsobe realized by using a periodic pattern of conducting pins,which are commonly called vias, printed on thetransmission-lines. In this article, some PBG structuresusing such via arrangements implemented on coplanarwaveguide (CPW) lines are proposed and analyzed by awell-known numerical method, the finite difference timedomain (FDTD) method. In addition, a chirping-and-tapering technique is employed onto the PBG pattern tofurther enhance the stop-band region and to suppress theside-lobes in the low frequency region. Results show agood band-gap behaviour on the given via structures. Theproposed PBG via structures may be applied in themicroelectronics and communications areas.