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This paper reports magnetic near-field probe for high frequency band up to 10 GHz and novel measurement technique for improvement of spatial resolution. We fabricated two types of magnetic near-field probe and evaluated frequency characteristics for magnetic and electric near-field in isolation. For the measurement results, we proposed accurate equivalent circuit of probes and evaluated each value...
In this paper, we propose a parameter optimization algorithm for EMC macro-modeling of IC/LSI power currents called the LECCS (linear equivalent circuit and current source) model. The unnecessary electro-magnetic wave from a digital electronics device may cause the electromagnetic interference (EMI) to other apparatus. Thus, its reduction has been regarded as one of the highest priority issues in...
We applied a LECCS (linear equivalent circuit and current source) model that has been proposed as a model for EMI simulation of an LSI to evaluate package EMI characteristics. We divided the LSI into the chip part and the package part and described it using the LECCS model. We simulated the power supply current spectrum while changing the package part. The measurement results, obtained using the MP...
An IR thermal imaging technique is used to measure the aperture excitations of phased array antennas. IR images of the heating patterns produced in a thin, lossy detector screen placed directly on the surface of the arrays are used to measure the aperture fields. These images can be used for field diagnostics at the remote locations of the antennas. The overall "state of health" of the arrays...
This paper describes a new digital wireless data acquisition system that can be used to measure electromagnetic interference (EMI) in power stations or other similar harsh environments. It comprises of a remote acquisition unit (RAU), a wireless data communication network (WDCN) and a PC-based control platform as a front end of the field-distributed-data-acquisition system, RAU captures, digitizes...
The power of ultra-wideband (UWB) signals has an extremely large frequency bandwidth which is a potential interference to narrow band systems. So UWB systems must obey the rules of frequency management of FCC when share frequency resources with traditional narrowband systems. It's presented the analysis of power spectral density (PSD) of direct sequence code UWB (DS-UWB) signals and some key factors...
A novel directional ultra-wideband (UWB) planar antenna is presented in this paper. The obtained antenna bandwidth is in order of 10:1. The directional behaviour is taken by slating a planar monopole antenna with respect to the ground plane. The UWB and directional characteristics of this antenna are obtained by optimizing simultaneously four parameters: bevelling and slating angles, the size of the...
This paper contains the results of computer simulations performed for several realistic scenarios of electromagnetic (EM) field evaluation near the cellular base station (CBS) and some analysis of obtained results. The motivation of this study is exposure assessment of EM energy on biological objects. There are scenarios of field distribution indoors, near the hill, obstacle like a wall and finally...
A simultaneous measurement method using parallel modulated probe array is proposed to measure the electromagnetic radiation. Each modulated probe is excited by a local signal with different frequency, so that the received IF signal contains different frequency components which indicate the relative magnitude of the RF signal at positions of the probes, and all the IF components are measured simultaneously...
For the measurement of nanosecond pulsed current, time domain calibration of current probes is discussed. A dynamic model for a self-integrating Rogowski coil is established based on the time domain calibration data. This modeling method can be used to describe the low-frequency distortion of the probe and it can also be used to compensate the distorted output of the probe. The validity of the established...
Electromagnetic compatibility (EMC) measurements are typically performed in anechoic rooms. However, the use of mode stirred chambers presents an alternative approach to such test facilities. This paper presents an investigation of the influence of exciting wires' phase shift on field distribution in an alternative mode stirred chamber. The TLM numerical simulations also demonstrate the applicability...
Ad-hoc wireless networks are comprised of mobile communications nodes (users and supporting relays) that typically have just enough radiating power to reach adjacent nodes, and in particular must operate in non-planned electromagnetic environments where propagation and EMC conditions are precarious and inter-node communications capabilities are highly variable. Nodal locations evolve from necessity,...
Regulations protecting people from exposure to harmful levels of radio frequency (RF) electromagnetic radiation (EMR) are now in force in Australia. The EMR regulations set limits for the specific absorption rate (SAR) of virtually all consumer RF transmitting devices. This paper will discuss the Australian EMR regulations and the SAR measurement methodologies prescribed for the compliance testing...
This paper presents a hardware and a soft ware study results which can perform measurement, analysis, and simulation of EM (electromagnetic) environment that affects on mobile radio receivers. EM environment data with GPS (Global Positioning System) information were collected, and EM environment was simulated based on these. A simulation program which can be an evaluating tool for the analysis of...
Two methods for evaluating the impedance of loaded power ground plane structures are compared. It is found that while one method is attractive in that it does not require a matrix inversion, it only provides an approximation solution for the loading effect. Furthermore, the approximation deteriorates as the values of the loading impedances are reduced
Fuel cell vehicle and hybrid electric vehicle are prospective new automotive technologies, but they may cause serious EMC problem. This paper gives the impedance characteristics of the power cables on the real chassis in the driving system by measurement. An equivalent circuit model is set up to describe the distribution parameters of the power cables. Impedance characteristics of cables on different...
In present digital systems a great deal of effort is put in signal integrity issues. This paper presents a way of improving the crosstalk immunity of digital systems using binary phase shift modulation. The results show that this improvement is achievable but it's dependent on the technology used. Simulations of all these aspects are presented using the effective bit duration and the jitter as quality...
The impact of any number of lumped elements connected to the power-bus has been taken into account recently by using a modified modal summation. The formulas derived provide excellent results for calculating the power-bus impedance in the case of small admittances connected to the PCB. In the case of very large admittances, some errors in the calculations can be observed. In this paper, we further...
In this contribution, an efficient finite element based domain decomposition method (DDM) is applied to analyze large electromagnetic problems with finite number of different building blocks. The method is based on three key ingredients: (a) the optimized Robin transmission condition across interfaces; (b) the new cement method for non-conforming triangulations and, (c) an fast dual-primal finite...
In this paper we discuss approach to estimation of CCI level. As one of the main principals for cellular communication systems design is the separation of the similarly tuned transmitters by some distance D, an attempt to find the function of CCI level from value of distance D has been made in this investigation
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