Microwave Devices Research Papers - Academia.edu (original) (raw)

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Because the body is electrochemical in nature, any force that disrupts or changes human electrochemical phenomena will affect the physiology of the body. This is described in Robert O. Becker’s book, The Body Electric and in Ellen Sugarman’s book, Warning, The Electricity around You May Be Hazardous to Your Health. This information is controversial, but from the best sources my research has found.

- by sumit sharma
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- Electromagnetism, Microcontrollers, RF and Microwave Systems, Microwave Devices

High frequency models of transistors are of interest because they have
applications to computer aided design of high frequency circuits. When
these models are derived, a problem encountered is that measured transistor S-parameters do not agree with the hybrid-π model. In this article, a simplified method is described to obtain an optimized
classical hybrid-π model that predicts the measured S-parameters of the device across the desired frequency band. The modeling capabilities of the CAD program Touchstone (now is incorporated with ADS) were utilized to create such a transistor model. The optimization
goal is to minimize the error function between the measured S-parameters and those of the RF transistor equivalent circuit.
This technique has been implemented to obtain a high frequency circuit model for the RF transistor BFY 90 across the band from 100 MHz to 500 MHz. Such a model can be used in time-domain circuit analysis programs to predict the transistor behavior.

- by Firas Mohammed
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- RF Design and Applications, Microwave Devices

International Journal of Microwave Engineering (JMICRO) is a peer-reviewed, open access journal which invites high quality manuscripts that focuses on Engineering and theory associated with microwave / millimeter-wave technology, guided wave structures, electromagnetic theory and implementation. Authors are invited to submit original research works that stimulate the development of latest technology in industry and academia. Good quality review papers and short communications are also acceptable.

Nickel nanowires with vertical alignment on the copper substrate were synthesized by direct current
electrodeposition method using polycarbonate template. The pore diameter of the template was 100 nm.
The morphological study of Ni nanowires was carried out by using scanning electron microscopy (SEM).
The reflective properties of the nanowires have been studied for the wavelength range of 380 to 700 nm of
visible light. The measurement of the incident and reflected light was carried out by using a high resolution
camera and a fiber. The analysis of the results showed that the reflection of incident light is low for lower
and upper region of wavelength. The peaks in the reflective spectrum are observed at 470 nm and 540 nm.

The existence of a large number of wireless standards motivates the investigation of a multi-standard wireless receiver architecture that uses the same hardware to meet performance requirements. This paper presents an architecture of a reconfigurable receiver operating at both Low-IF and Zero-IF modes for GSM-1800 and UMTS-2100 wireless standards. The reconfigurability in the RF front-end part is achieved by a reconfigurable filter based on a dual mode resonator with the possibility of using MEMS switches to tune the center frequency and the bandwidth of the preselector filter. System-level analysis and derivation of block-level specification for the specified standards are developed to design the receiver. Simulation results of both system-level analysis of the reconfigurable receiver and circuit design of the reconfigurable filter are presented and discussed. Simulation results indicate that the designed receiver meets the minimum requirements specified in GSM-1800 and UMTS-2100 wireless standards with a good margin.

abdellatif slimani 1 , saad dosse bennani 2 , ali el alami 3 and mohamed amellal 4 A 4-8 GHz ultra wide band microstrip array antennas with improved gain for weather Radar applications was designed and fabricated. The microstrip radiating elements of the proposed array antennas are powered using a T-junction power divider with quarter wave-transformer impedance for a best matching. The design of this array antennas is based on the geometry of a linear array antennas well studied [ref (8)], which is based on minimizing of the electromagnetic (EM) coupling between the radiating elements and as decreasing the number of side lobes. The array antennas with dimension of (110 × 214 × 1.58 mm 3) is fabricated on FR-4 epoxy dielectric with relative permittivity of 4.4 and thickness h ¼ 1.58 mm, it is performed in the full-wave EM solver High Frequency Structure Simulator, CST and verified by measurement. The proposed broadband array antennas show a better performance than the references antennas in deferent parameter which cited after.

The mechanical and thermo-mechanical integrity of GaN-on-diamond wafers used for ultra-high power microwave electronic devices was studied using a micro-pillar based in situ mechanical testing approach combined with an optical investigation of the stress and heat transfer across interfaces. We find the GaN/diamond interface to be thermo-mechanically stable, illustrating the potential for this new material for reliable GaN electronic devices.

- by Dong Liu and +1
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- Power Electronics, Electronics, Microwave, Raman Spectroscopy
- by Joydeep Banerjee
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- Electrical Engineering, Microwave Devices

International Journal of Antennas is a peer-reviewed, open access journal that publishes original research as well as review articles in the field of antennas and its allied domain. This journal aims to bring together leading academic scientists, researchers, engineers and research scholars to exchange and share their experiences and research results in their specialized arena in antenna engineering. The journal invites good quality research and review papers for publications.

A method of detecting a missing parallel-connected bond-wires in packaged microwave transistors is described. Instead of the conventional way of testing the transistor in the amplifier configuration, the new method tests the device as an oscillator. Using the oscillation frequency as the screening criterion reduces test complexity and allows easy integration with existing automated test handlers.
Keywords - missing parallel bond-wires, wirebond, microwave transistor packaging, automated test handler.

- by Chin-Leong Lim
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- Electronic Engineering, RF Electronic, Microwave Devices, RF/Microwave Engineering

Microwave Devices Research Papers - Academia.edu (original) (raw)

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