@SOHEIL
I have a sketch of an SAR drone I did sometime ago (I don't know exactly when). I don't have a scanner at home so
I'm uploading the pics I clicked with my phone -
It's got 2 air inlets, single non-afterburing turbofan engine, dual fins, no tail stabilizers, and, as per me, should be a
swept wing aircraft. The huge belly is where the powerful SAR radar is to be put. The thing on the cockpit area is a
small Electro-Optical/Infra-Red tracking system (like the one F-35 has below the cockpit fuselage), inside the upper
dome is a SATCOM antenna. The design is not all geometrically correct (I used gel pen, no ruler etc.) but see what you think of it. If you give me some time I can now work out the top, rear & bottom views (and front, rear 3-quarters) to fully visualize the design.
This drone is not entirely designed for low-observability, although it has several RCS-reduction features like angled nose, serrated edges on landing gear doors, angled nozzle, etc.
...... what in I am not creative did you not understand 
