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In this study, a method for designing and fabricating an X-band dual linear polarization converter is proposed. Using the equivalent circuit model, the unit cell design was analyzed for the three-layered polarization converter structure, dipole-via-dipole, and the parameters affecting the transmission and reflection performance were determined. To manufacture the polarization converter with an arbitrary height of the via structure, a 3D printing technique was adopted. An 8×8 array metasurface was fabricated to measure the propagation properties, and it was verified that the polarization converter shows high performance in transmission and polarization conversion in the entire X-band. [ABSTRACT FROM AUTHOR]

In this study, an equivalent circuit model of a double exponential pulse generator used as a noise source in a high-altitude electro- magnetic pulse (HEMP) conductive disturbance immunity test is proposed. Based on the proposed models, a design methodology for a double exponential pulse generator is presented with various source pulse requirements based on the HEMP conductive disturbance immunity test. To design the proposed equivalent circuit model, the relationship between the equivalent circuit model and source pulse requirements is analyzed and applied to the design methodology with low-impedance conditions. The proposed equivalent circuit model and design methodology are successfully verified experimentally with device-under-test circuits fabricated on printed circuit boards. [ABSTRACT FROM AUTHOR]

High-power electromagnetic fields, which are used as one of the core weapon systems in electronic warfare, can cause malfunctions in communication and power systems. Therefore, it is necessary to study their effects on civil and military facilities. In this paper, an approximated method for analyzing the voltage induced in a cable, placed inside a building, by HEMP was proposed. To calculate the electric field penetrating into the building, an equivalent medium for a multilayer reinforced concrete structure was implemented, and its transmission and reflection characteristics were obtained. The penetration level of the E1 pulse and the load voltage of the cable for unit voltage sources at each load were calculated. Subsequently, the coupling voltage was obtained and verified. [ABSTRACT FROM AUTHOR]

In this study, we analyze the characteristics of wireless power transfer(WPT) based on magnetic resonance in an underwater environment and propose an equivalent model suitable for underwater WPT. The proposed underwater WPT equivalent model is constructed by expanding the free-space WPT T-model reflecting characteristics change according to media. Considering the water salinity, we propose a method to extract the parameters of the proposed model based on the S parameters. To verify the proposed model, a 6.78-MHz underwater WPT system was constructed and compared with the predicted power transfer efficiency of the model. As a result, it was confirmed that the proposed model predicts the variation of characteristics with an average error of less than 3 %. [ABSTRACT FROM AUTHOR]

In this paper, a new high-frequency equivalent circuit model of printed spiral coils (PSCs) for radio-frequency interference (RFI) measurement has been proposed. To achieve high-frequency modeling, the proposed model consists of distributed components designed based on the design parameters of the PSCs. In addition, an analytic model for PSCs based on T-pi conversion has been proposed. To investigate the feasibility of the proposed model for RFI measurement, the transfer function between a microstrip line and a PSC has been extracted by combining the proposed model and mutual inductance. The self-impedances of the proposed model and the transfer function have been successfully validated using three-dimensional field simulation and measurements, revealing noticeable correlations up to a frequency of 6 GHz. The proposed model can be employed for high-frequency probe design and RFI noise estimation in the gigahertz range wireless communication bands. [ABSTRACT FROM AUTHOR]