چكيده به لاتين
The structures of spoof surface plasmon polariton are among the developing technologies that have many advantages over other old lines, so helping to advance this technology can be very effective in the future of this emerging science. In this thesis, an automatic design method for a single unit cell of spoof surface plasmon polaritons with almost arbitrary dispersion curve is proposed. So far, to obtain a unit cell with the desired dispersion curve, a simple structure should be considered randomly, and then by changing its geometric dimensions, its dispersion curve should be controlled to reach the desired curve. But in the proposed method in this thesis, it is enough to consider the specifications of the dispersion curve itself and, using the pixelated structure and the particle swarm optimization algorithm, to achieve the correct unit cell. This method provides a lot of freedom to control the dispersion curve. For example, in the first proposed structure, the dispersion curve is controlled to achieve the maximum wave concentration or to have the lowest side frequency, or in the second structure, the second mode of the dispersion curve is independently investigated from the first mode. In the third and fourth structures, this proposed method is also used for SIW structures, and two spoof surface plasmon polariton lines with narrowband and bandpass filter applications are designed and simulated, all of which are detailed in future chapters. Finally, to demonstrate the correctness of the work and the proposed method, three quasi-phasar surface plasmon polariton lines are fabricated, and the test results and simulations are presented, which are in very good agreement with each other.
