Entities With Antenna Planar Microwave Research

Compared to household microwave oven, commercial microwave oven has higheroutput power, higher using frequency, higher heating efficiency, and higher reliability.The non-turntable commercial microwave oven but with obvious antenna, hasbeen recognized as a highly efficient matching mode for microwave oven by theindustry.Double magnetron can meet the high output power over2000W.This thesis is following above-mentioned requirements of commercial microwaveoven, using G34L, the brand new platform of non-turntable commercial microwaveoven, as the R&D object. With theory and practice combined, it is to develop aprofessional commercial microwave oven that is with high output power, high efficiency,high reliability.The major contents of the R&D include:1. To design the measurement, position of waveguide, installation way and position ofantenna according to the structure feature of microwave oven cavity.2. To fix the measurement of antenna and antenna shaft, and the position andmeasurement of adjusting shaft, based on the testing result of network analysisequipment. And therefore complete the cold matching design of cavity.3. To verify the safety performance and cooking effects of double antenna microwaveoven, according to the performance test standard of microwave oven and foodcooking test standard.4. To verify part of the above experiments with emulation technique.This thesis has proved the following results through lots of tests:（1）When the cavity measurement is not ideally matched to magnetron, we canadd to the improvement of adjusting shaft. The normal height of adjusting shaft is9m.Changing the height has relatively big impact on the matching.（2）The major issue of microwave oven with antenna is its uniformity. Bychanging the measurement and shape of antenna, we can improve its uniformity.（3）The antenna shaft part that is deep into waveguide can be considered as sensor. According to the theory of mirror, its height can be reduced by half.