+Analysis and Optimization of Passive Intermodulation in MicrowaveAnalysis and Optimization of Passive Intermodulation in Microwave Coaxial Cavity Filters In-Kui Cho, Jin Tae Kim, Myung Yung Jeong, Tae-Goo Choy, and Young Il Kang We studied how the passive intermodulation (PIM) power arising in air cavity filters could be calculated and how the design of the filter could be optimized in order to reduce the amplitude of the PIM signal. To do this, using simulated results, we optimized the various parameters of a filter. PIM in an air cavity filter depends on the power dissipated in its cavities. A reduction of this power loss therefore decreases the PIM power in the air cavity filter. Our experimental results confirm that it is possible to design and produce air cavity filters that generate low PIM signals. I. INTRODUCTION The generation of passive inte……