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In this paper, the novel impedance matching method using multiport network analysis and the particle swarm optimization (PSO) algorithm is proposed. To evaluate the accuracy and reliability of the proposed method, the real handset model is employed, and the target impedance matching is conducted. Good impedance matching results are obtained in the long term evolution (LTE) band8. The calculated results...
Conventionally, EBG structures are used in the printed circuit boards (PCBs) level [1]. We proposed the Pinwheel Meander-line Perforated Plane (PMPP) structure as the solution [2]. In this paper, we modify the PMPP to reduce the area and electromagnetic emission (EMI). By reducing the thickness of dielectric layers and plane from 30μm to 10μm, we reduce the number of meander-line curves from 5 to...
A Comparison of 4 different types of antennas, — a biconical (dipole like-type) antenna, a single log periodic dipole antenna (LPDA), a dual-stacked log periodic antenna (dual-stacked LPDA, HL043E) and Extended-Double Ridge Guide (Ext-DRG) Horn antenna has been performed. The aims are to obtain an analysis of the homogeneity of the field as well as the required power, i.e, the efficiency. For all...
The distribution of the roots in point and discretized continuous spectra is investigated as functions of terahertz frequencies in a metal-insulator-metal waveguide. The shape of the roots distribution affects the various electromagnetic wave transmission through the metal slit. The lossy transmittances in metals are found compared to no loss with a perfect conductor.
A hybrid numerical scheme for calculating the scattering by a tail-wing structure is proposed, which is based on an iterative physical optics and the physical theory of diffraction. The proposed method is numerically verified for a simply modeled conducting tail-wing structure.
This paper describes the efficiency of the fast electromagnetic simulation method for analysing the PCBs. This method is constructed by combination of the multi graphics processing unit (GPU) systems and the weakly conditionally stable algorithms. The weakly conditionally method is faster than the conventional ones in the case of fine cell including the computational domain. In addition, this method...
Radiated immunity testing is one of common applications performed in reverberation chambers as per many EMC standards such as IEC 61000-4-21, DO160F, DO160G and MIL-STD461F. Although there are a good number of standards that support EMC testing in reverberation chambers, there are differences in analysis and application methods between them, which may lead to discrepancies in test results. In this...
In the emission standard CISPR32 for multimedia equipment (MME), the specification provided for cabling on the reference ground plane (RGP) stipulates that the thickness of the insulation shall not be more than 150 mm. However, the emission standard does not specify a minimum insulation thickness. Therefore, it is assumed that measurements will be conducted at various insulation thicknesses across...
Conflicts of interest in determining permitted levels of EMI of electronic products between different standard committees result in a deadlock. In this context, the conventional approach used in defining the levels is not sufficient anymore to overcome contemporary EMI cases due to technology which rapidly advances. On the other hand, customers need to be protected by EMI standards which must adapt...
Configurations, such as the physical layout of the measurement setup and operation conditions of equipment under test (EUT) especially the complexity of the displayed image for conducted emission measurements specified in CISPR 32[1] differ from those in CISPR 13 [2]. CISPR 32 requires a typical system configuration but CISPR 13 does not require the system. After CISPR 32 was published, multimedia...
FFT-based measuring receivers can be used for EMI compliance measurements in accordance with Amendment 1 to 3rd Edition of CISPR 16-1-1 if this standard is referenced in the product standard. The use is motivated by reducing the scan time by several orders of magnitude and to get more insight due to the possibility of applying longer measurement times and enhanced measurement function like the persistence...
With recent advanced CMOS technologies, integrated circuits (ICs) have higher integration densities. The current consumption caused by the simultaneous switching in the highly integrated ICs has been increased, which leads to the increase of power supply noises. This paper investigates a joint impact of two design techniques on power supply noise reduction: a multi-frequency clocking (MFC) and a globally...
In this paper, a board-level signal integrity design depending on printed circuit board (PCB) stack-up configuration is presented. The design object is an embedded Multi-Chip Package (eMCP) interface which is employed for low-cost and high-performance memory interface in low-or mid-tier mobile devices. The eMCP interface is fabricated on a PCB with a 2-6-2 layer stack-up and staggered micro-via process...
Electromagnetic interference (EMI) suppression becomes more and more prominent in the design of electronic systems, especially in the design of modular systems. An advanced EMI suppression approach for modular systems is proposed in this paper. In this approach, the output spectrum of a system or a module is analyzed and decomposed into several types which are called elements in this paper. Each element...
In this paper, a transmission array of a focused microwave thermotherapy system is introduced for those with diseases of the leg. A microwave time reversal analysis is introduced to understand microwave focusing. The transmitter circuit of a transmission array is evaluated by measuring the phase control and the magnitude control at the array output port. The results are satisfied to focus fields at...
The miniaturization of unit cells in planar electromagnetic bandgap (EBG) structures has been difficult because the stopband frequency depends on the unit-cell size. To solve this problem, we developed an EBG structure that uses two power planes (dual power plane: DPP) with the addition of a capacitive coupling element. This enables us to easily enlarge the capacitance formed in the unit cell and...
The fast switching operation of wide-bandgap power semiconductor devices deteriorates the Electromagnetic interference (EMI) noise characteristics of a power converter. The parasitic inductance in a power module is one cause of noise generator. This paper calculates parasitic inductance in a wiring pattern of module with Partial Element Equivalent Circuit (PEEC) method, and evaluates the current distribution...
A method to predict the modulated noise coupling to an antenna is proposed and experimentally validated using a practical mobile phone. The baseband noise of a liquid crystal display (LCD) is modulated with the Tx carrier signal of cellular communication, resulting in a radio frequency desensitization problem. The modulation mechanism is understood and its circuit representation is proposed to estimate...
In this paper, to estimate the Wi-Fi throughput between smart TV and AP (Access Point), the novel methodology is realized by modeling of Wi-Fi 802.11n communication considered real system characteristics. Also, analysis of throughput performance of digital TV by noise effect using the simulation methodology is presented. This result shows very good agreement between measurement and the proposed methodology.
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