015050082844 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 53, NO. 9, SEPTEMBER 2005 Stopband-Enhanced and Size-Miniaturized Low-Pass Filters Using High-Impedance Property of Offset Finite-Ground Microstrip Line Sheng Sun, Student Member, IEEE, and Lei Zhu, Senior Member, IEEE Abstract―The uniform nite-ground microstrip line (FGMSL) and its constituted circuit elements are thoroughly characterized via self-calibrated method of moments for innovative design of a stopband-enhanced and size-miniaturized low-pass lter (LPF). Firstly, an offset FGMSL is modeled and extracted to quantitatively exhibit its capacity in achieving higher characteristic impedance compared to the innite-ground microstrip line (MSL) counterpart. Secondly, the nite-extended FGMSL section with equally widened stri……