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A co-design method for the dual-band low noise amplifier (LNA) and band-pass filter (BPF) is presented in this paper. After the dual-band BPF and two single-band LNAs are designed separately by the traditional method, the two single-band matching networks (MNs) of the LNAs are transformed into one dual-band MN. Further, the dual-band MN and BPF are combined into the dual-band filtering MN, of which...
Placement variation is one example of parameters that critically affects the performance of RF absorbers. In this work, four designed variation patterns - W, X, Y, and Z were discussed to compare the reflectivity (S11) of designed wedge microwave absorbers. Two sub-shapes were investigated in this work - straight wedge and oblique wedge, each type having three variation of top width dimension. The...
In-situ EMC testing is, for large fixed systems and installations within the scope of the European EMC Directive, not a primary requirement other than unintended RF emissions may not affect intended radio frequency communication services, like the requirements of IEC/EN 55011 outside the end-user's premises. Whatever happens on the premises of the industrial end-user is a matter of negotiations and...
The 3D imaging microwave altimeter is a proposed instrument for obtaining centimeter level accuracy of topography for ocean and meter-level accuracy of topography for land. In order to ensure the normal operation of the system and improve its performance, the EMI and EMC problems should be considered in design phase. In this paper, the architecture of altimeter system is shown and the main EMI sources...
With the growing numbers of mobile phone users, base stations and other ubiquitous communication apparatuses, electromagnetic hazard to human health is luring prior concerns in general populations and government organizations. This paper presents government management on RF radiation issues through inter-department coordination effort in Taiwan. Regulation and techniques for measuring/reducing EM...
This paper presents a fast analysis of the electromagnetic interference (EMI) problem associated with a microstrip amplifier. This study is mainly based on the recently developed fast model which fully makes use of the commercial circuit solver. By using this fast model, the electric field radiated from an RF microstrip amplifier on the printed circuit board (PCB) is efficiently characterized. In...
Using spread spectrum clocking techniques with digital systems is quite commonly used to reduce RF emission at the higher harmonics, this to fulfill the existing EMC regulations. Results have been reported frequently. However, with analogue interfaces, fixed frequency sampling is still in place for the sake of signal reconstruction and processing algorithms. In this paper the use of discrete spread...
An enhanced remote sensing technique for the detection and identification of deeply buried objects is presented in this paper. A new RF Tomographic Technique is proposed for developing RF CAT Scans of buried objects using spectral and spatial diversity. This imaging technique uses an embedded ring of subsurface radiators as the source of strong underground radiated transmissions. Distributed surface-contact...
This paper deals with the propagation of RF disturbances injected inside an integrated circuit. To increase our knowledge about this topic, an on-chip voltage sensor is implemented inside a test vehicle to quantify the conducted RF disturbances injected on the power supply of its I/Os. The experiment results give information about coupling paths taken by conducted disturbances carried into I/Os. I/O...
A single inductor matching network that carried low noise is designed to achieve the input wideband matching. This way has lower complexity that reduces chip area and holds the good reflection coefficient. Besides, the current reuse technique was used to achieve low power consumption. The design is simulated by Taiwan Semiconductor Manufacturing Company (TSMC) 0.18μm RF CMOS process. Through a 1V/5...
A novel 1550 nm fiber laser structure Chirped Pulse Amplification system has been present in this paper. The Phase Locked Loop structure and pulse picker structure has been arranged to get accurate and stable phase noise control and repetition rate frequency exchanging. The Grating stretcher and DCF stretcher and Grating compressor structure make completed chirp function for overall Amplification...
There has been growing concern about the possible adverse health effects resulting from exposure to radiofrequency radiations (RFR), such as those from mobile communication devices. Since the introduction of mobile phones many investigations have been conducted on alleged health effects, but there is still a lot of uncertainty and no definitive conclusions have been reached so far. Although thermal...
Hardware developers often seem to view compliance with exposure standards as a necessary evil to be put off for fear a non-compliant outcome could end a project, or because it is assumed that the device poses no health risk. The public, on the other hand, continues to see health risks in even the lowest power devices, such as cell phones; while simultaneously adopting new technologies. If developers...
A number of possible physical mechanisms for radiofrequency (RF) interactions with biological systems have been proposed over the past 50 years. Evaluation of proposed mechanisms of interaction suggests there is no physical reason to expect a low-level non-thermal effect between 100 MHz and 150 GHz, possibly excepting those conditions suitable for radical pair effects on biochemical rates. Experimental...
This paper summarizes the weight of scientific evidence on whether or not exposure of laboratory animals to radiofrequency (RF) energy a) causes or promotes tumor development and b) affects the integrity of the blood-brain barrier (BBB). Forty-four studies of tumorigenesis were identified. In addition to the studies of spontaneous tumorigenesis in animals exposed to RF energy alone, 21 of the 44 studies...
In this paper, the Adaptive Frequency Sampling(AFS) technique is modified to macromodel the RF components. The conventional AFS can just express the frequency response as a rational function, but ends up with inefficiency in macromodelling So the proposed scheme here enables the AFS to macromodel the problem by finding the equivalent circuit of the frequency response, since the coefficients of the...
With the continuous trend towards smaller mobile devices with sophisticated functionality and multiple wireless bands, concerns about possible insufficient over-the-air (OTA) performance and increased Specific Absorption Rate (SAR) values are growing within the wireless-telephone industry. These new phones must also comply with the hearing aid compatibility (HAC) standards. The aim of this paper is...
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