Parametric studies on effects of defected ground structure (DGS) for dual band bandstop microstrip filterFarah Shazuani Mahmud, Muhammad Shahrazel Razalli, Hasliza A Rahim, Wee Fwen Hoon and Mohd Zaizu IlyasEPJ Web Conf., 162 (2017) 01063DOI: https://doi.org/10.1051/epjconf/201716201063