the dimension of the filter should be around 27-30 mm2. I searched for some journals and articles from the IEEE site and I found a relevent article. I'm attaching the pdf file here. However the design in it is made with a resonant frequency at 5.3GHz,lower cut-off frequency at around 5GHz and upper cut-off frequency at 6.0GHz. The objective of my design is that the resonant,lower and upper cut-off frequency should be in the Ku band (12-18GHz).I tried varying the parameters of the lumped components designed in the article and it just affects the bandwidth while the resonant frequency remains at 5.3GHz. Please kindly have a look at the file and help me solve the problem.Thanks alot in advance.For your info,I'm using ADS(Advanced Design System) as a simulation tool.