Complex Medium Time Domain Spectrum Analysis Of Microwave Device

Complex medium is widely used in RF microwave devices applied in wireless communication system transceiver front end in order to achieve the appropriate performance. The parameters’ complexity of the constitutive model conduces to the intricacy of the electromagnetic wave that propagates in the complex medium. Meanwhile, the design cost of the RF microwave devices rises greatly due to the numbered method to improve the performance. Thanks to the rapid development of numerical simulation technology and computer hardware technology, device design costs dropped significantly. Therefore, the study of the numerical simulation algorithm plays an important role in engineering.In the numerical simulation methods, the time domain methods can give transient information of the computational domain. The broad-range frequency domain information can be obtained through a simple Fourier transform. Typical time domain method includes the FDTD method and the FETD method. FDTD method is relatively simple, but the meshing and calculation accuracy is not high; The mesh calculation accuracy of the FETD method is relatively high, but there is an undeniable problem that each time step of the FETD method involves a linear equations, therefore the calculation cost and the time consumed is very expensive.The time-domain spectral element method (SETD) employed in this article is a special type of the FETD method. It adds the spectrum method into the finite element method. Different precision of the SETD method is achieved through the selection of different basis functions; Moreover, the inverse matrix of the block diagonal coefficient matrix is easily obtained due to its unique curved hexahedral mesh discrete manner, and thus greatly reduces the complexity of solving equations to save the computation time. Two categories of complex medium are used-the magnetic flux density and magnetic field strength of the complex relationship between the complexity of the medium (ferrite) and electric displacement vector and electric field strength for the derivation of the complex relationship between the complexity of the constitutive relations of the medium (plasma), Maxwell’s equations as the governing equations, we change the original leapfrog iteration of electric field intensityâ†'Magnetic field intensityâ†'electric field intensity (Eâ†'Hâ†'E) respectively to the leapfrog iteration of the electric field intensityâ†'magnetic induction intensityâ†'Magnetic field intensity (Eâ†'Bâ†'H, applicable to ferrites) and to the leapfrog iteration of the electric displacement vectorâ†'electric field intensityâ†'Magnetic field intensity (Dâ†'Eâ†'H, applicable to plasma), we reached the purpose of calculating the two complex medium. Finally, examples of specific complex medium devices are given to verify the correctness of the program presented.