Jigyasa Sharma, Dhirendra Kumar, and Asok De. “Filters Modified ComplementarySplit-Ring Resonator Geometries With Face to Face Orientations in Substrate Integrated Waveguide for Applications As Band Pass”. International Journal of Advances in Microwave Technology, vol. 2, no. 3, Oct. 2020, pp. 122-5, https://ijamt.com/index.php/ijamt/article/view/55.