values for characteristics i need is under 100uH

You'll have to make room for a larger inductor.
A 100μH inductor has an impedance of only 62.8Ω at 100kHz which will not adequately block the signal from the voltage source and load.

 

so it looks like 100mH inductor is hard to find at required current and size limitations. Any ideas. I reran simulation with 100uH and signal looks way different. More like sign wave.

Hi again,

If you use a smaller inductor then you need to raise the transmission frequency. The results are proportional so if you decrease the inductance by a factor of 10 then you must increase the frequency by a factor of 10 to get similar results. Transmitters rarely operate at the fundamental information frequency anyway, they usually have a carrier. The carrier frequency may be many times higher than the message frequency for good resolution as well as other reasons. On the receive side a demodulator turns the carrier back into the actual message signal.

 

So how high a transmission frequency could you go to?
It sounds like you are using binary frequency-shift keying to send the signal.

 

The plan was to use 100Khz and 400khz. what do you think is the minimum inductance I can get away to block ac from dc.

 

I managed to get it to work reasonably well with 1mH inductors as shown below, but I don't think you can go much below that without increasing the frequency.

 

i will try to build this with what i have in stock. I will let you know how it goes