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High thermal density amplifier, which is mainly composed of RADAR, is used to amplify transmit
and receive signals. In this paper the antenna system includes that amplifier, which is accompanied by
very significant heat dissipation levels and have narrow cooling space. So, We suggested the
liquid-cooling system to ensure thermal reliability and investigated a circulation of cooling water which
have the optimized temperature, flow rate and pressure loss. In this paper, we find the optimum values
of design factors through theoretically with TDC(Thermal Design with CFD) and evaluated by product
test. As the results, the performance of the Cooling system shows the propriety under the high operating
temperature condition, +63  d d d