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This paper describes a simple method to optimize the design of a high-power T-bar coaxial-to-rectangular waveguide (WR2300) transition including coaxial RF window using CST Microwave Studio code. S-parameter analysis has been iteratively used to find matching solutions at 350 MHz. A narrow-band structure has been analyzed with an aim to establish a computer-based electromagnetic design methodology for practical high-power coaxial-to-rectangular waveguide transition. Low RF power measurement results of the cold test model of the coaxial RF window and T-bar transition assembly agree quite closely with the predicted value at designed frequency by simulation.