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There is a book named "Microwave Devices & Circuits" by Bhal & Bhartia. You can find it very usefull. I have done implementation of Low Pass filter (Butterworth & Chebyscheff). Refer the code attached.
The code is in Matlab format.
Also the filter supposed to be in Ladder form with parallel capacitors and serial inductors.
And the code will only provide the length of the strip segments in the picture.
The width of them is related to the impedance of the elements (Zi, Zl, Zc), you can get it easily using microstrip impedance relation.