I am Struggling for Development of 4mm* 4mm Size Low pass Filter having passband at 2.4G but strong stopband at 4.8 GHz and 7.2 GHz using Microstrip with Substrate thickness 8 mils.
I am planning to use Defected ground to create miniturization and addtional LC generation with ground discontinuity.. Lumped Element is not acceptable. This is the big issue
I agree. Low pass filters with these small dimensions are usually implemented as semi-discrete designs (printed L and C) in LTCC technology.
Here is one example: https://www.minicircuits.com/pdfs/LFCN-2400.pdf
since ur having a very strict restriction on size.. u cannot design a filter in 4mm *4mm other than LTCC. But in case if u can relax ur size u can design.
By the way what are other specs are they too stringent..??
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Or buy the LTCC component from minicircuits if u r doing a system design.........