Coax,coax pin and probe size and airbox height

my problem is how to determine the radius for probe,coax,coax pin and the height for coax.Other then,how should the size for airbox.tq

Size the coax for the particular impedance you desire. Take a look at the dimensions of the commercial cables you might use in fabrication as a starting point. Generally the airbox should have about a quarter wavelength of clearance around your model, more if you have a strong computer with plenty of RAM.

can u explain more detail about calculation for air box.

Your original question was in August of last year.

Have you been working on this problem since then? To make a meaningful response I need more details of your situation. Just how you intend to use an airbox with the coax is a mystery.