Abstract: The choke structure of the door is a key component to prevent microwave leakage from the gap between the oven cavity and the door. In this paper, a simplified model for simulation calculation of choke structure of 5.8 GHz frequency microwave oven door is presented. By using CST electromagnetic simulation software, the structure parameters of choke fins affecting the shielding effect of microwave leakage are calculated by parameter-sweep. The key dimensions of choke fins are determined quickly. Basing on this, the final structure with S-parameter S21 is further optimized up to -86dB. The test of 5.8GHz microwave oven shows that the door with the designed choke fins has a good shielding effect, which solves the microwave leakage safety problem of 5.8GHz microwave oven.

Key words: Microwave oven, Microwave leakage, Choke structure