Modeling On The Electromagnetic Coupling Behavior Of Electronic Equipments In The Environment Of High-intensity Radiated Fields

The high-intensity radiated fields (HIRF), with the characteristics of broad spectrum, high fieldintensity and long duration, is a comprehensive electromagnetic field, including the electromagneticenergy radiated from all kinds of ground-based, naval and airborne radio frequency (RF) transmitters.It is considered as one of the most rigorous electromagnetic threats for civil aircrafts. It is veryimportant and valuable to analyze the interference-coupling mechanism of inner airborne electronicequipments in the environment of HIRF. The exterior connected power wires and signal wires ofelectronic equipments, is one of the most important way to induce the interference signal from HIRF.Therefore, the field-to-wire and field-to-cable-bundle coupling issues in the environment of HIRF aredeeply researched as follows:1. The BLT (Baum-Liu-Tesche) equation is used to analyze the electromagnetic coupling ofoverhead wires and shield cables excited by external electromagnetic field, respectively. Themodeling method of field-to-wire coupling for overhead wires with arbitrary layout is presented byintroducing the concept of ideal junction. Simulated results show that the field-to-wire coupling foroverhead wires with arbitrary layout excited by external electromagnetic field can be analyzedefficiently.2. Combined the full-wave method with BLT-equation method, a decoupled method foranalyzing the coupling issue between external electromagnetic field and a penetrating cable on ashielding box is presented. The exciting field on the cable is solved by a full-wave commercialsoftware. Then, the source vector of BLT equation is generated by introducing the exciting field intoAgrawal’s model. By solving the BLT equation, the electromagnetic response on the load is obtained.Two cases of a penetrating cable and a penetrating shield cable on a shielding box are simulated,respectively. The numerical results show that the accuracy by the presented combined method issimilar with that by complete full-wave method, and the computation efficiency is improved greatly.3. Combined the equivalent cable bundle method (ECBM) and the BLT-equation method, anequivalent method for analyzing the electromagnetic coupling of cable bundles excited by externalelectromagnetic field is derived. By ECBM, a complex multi-core cable can be transformed into acable bundle model composed with no more than four conductor wires. Then, the simplified cablebundle model is analyzed by BLT-equation method. A case for an overhead cable bundle and apenetrating cable bundle on a shielding box is calculated. Simulated results show that the efficiencyfor analyzing field-to-cable-bundle coupling is improved greatly by introducing the ECBM. 4. Combined the iterative physical optics (IPO) method and the BLT-equation method, amodeling approach for dealing with the field-to-wire coupling inside an open-ended cavity isproposed. The efficiency for evaluating the electromagnetic profile inside large cabins is greatlyincreased by IPO method. Two cases of field-to-wire coupling in a rectangular cabin and a cylindricalcabin are simulated. Numerical results demonstrate the accuracy and efficiency of proposed method.