| Seismic Electromagnetic Detection of satellite digital transmitter box can play a very good shielding effect. But because of it is need cooling, ventilation and electrical connections with the outside, inevitably there are some circular hole seams. Electromagnetic scattering is likely to cause electromagnetic interference to other space-borne detection equipment, which caused by these circular hole seams. This is the key factor that affecting the digital transmitter box's shielding effectiveness.In this paper, use one of the mainstream methods-vector finite element boundary integral method. For the characteristics of the electric smaller size of circular hole seam electromagnetic scattering, the complex internal structure of seam and the circular hole seam outside objective area has simple structure and is infinite open, analyses the circular hole seam's electromagnetic scattering characteristic, derive circular hole seam electromagnetic scattering basic conditions, According to the variational principle get functional equation. Discreting this formula, get the vector finite element boundary integral equation method formula.Based on derived formula and Ansoft HFSS, simulate circular hole seam of satellite digital transmitter box without wires are insert into them and insert some wires into it (the wires have the same length,but the boxes'length are different), boxes'cooling holes,electromagnetic scattering of the whole box. Analysis of the obtained results:From the beginning 1350MHz, insert wire hole slit scattering scattering than the conductors did not insert the value of big. The individual frequency (1.380GHz) the situation is the opposite; the same length of wire, insert the box of different lengths, scattering in varying degrees, insert the longer wire box, scattering more serious. The individual frequency (0.90GHz,1.380GHz) On the contrary, it is consistent according to the theory of expected wire-driven aperture. To determine whether the data-transmission transmitter onboard equipment to work to provide detailed data on impact.The paper provide each kind of graphics about all the simulations,such as grid cover figure, field cover figure, convergence figure, calculation chart and 2D and 3D far field direction figure. Besides all the calculation equations are convergence, the results are accurate.For analysis of many kind of circular hole seams'electromagnetic scattering problem,the paper private a new method. |
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