EMWorks Blog

ElectroMagnetic Design Made Easy

https://www.emworks.com/blog/motor-design/permanent-magnet-linear-generators-design-challenges

PERMANENT MAGNET LINEAR GENERATORS DESIGN CHALLENGES

EMS

A permanent magnet linear generator (PMLG) is simply a generator made up of a stator, translator, and air gap. The stator is usually made up of copper windings and laminations which aim at minimizing the eddy current losses. The translator consists of permanent magnets that can be either rings, cylinders, or rectangles and made of rare earth material. Depending on the required force and the air gap magnetic field, the magnets can be arranged radially, axially, or in Halbach fashion.

Kousseil Ben Ahmed | 22/10/2021
https://www.emworks.com/blog/s-parameters/a-technique-to-improve-the-frequency-response-of-a-microstrip-lowpass-filter

A TECHNIQUE TO IMPROVE THE FREQUENCY RESPONSE OF A MICROSTRIP LOWPASS FILTER

HFWorks

Lowpass filters are essential ingredients of microwave and wireless devices and systems. However, they suffer from a limited harmonic rejection in the stopband. A remedy which is traditionally used by microwave engineers is to add attenuation poles to extend the stopband bandwidth. Unfortunately, such workaround usually increases the overall size of the filter which is, definitely, undesirable and hinders the ever-increasing demand for miniaturization. In recent years, a new technique to limit the harmonic rejection in the stopband, has become popular among microwave engineers. This technique, which consists of etching-out slots or defects on the ground plane of a printed microstrip board, is called a Defected Ground Structure (DGS). You can actually think of a DGS as a simplified form of Electromagnetic Band Gap (EBG) structure.

Nesrine Selmi | 14/10/2021
https://www.emworks.com/blog/ems-knowledge-base/wireless-power-transfer-for-implantable-biomedical-devices

WIRELESS POWER TRANSFER FOR IMPLANTABLE BIOMEDICAL DEVICES

EMS EMWorks2D

Wireless Power Transfer (WPT) is a technique to transmit electric power without connecting wires using electromagnetic fields and waves. Generally speaking, WPT methods can be categorized to either non-radiative –near field- or radiative –far field. A power transfer is considered non-radiative if the maximum diameter of both the receiver and transmitter is less than half of the operating wavelength (π·π‘šπ‘Žπ‘₯ < πœ†/2) and the transfer distance π‘Ÿ is less than the wavelength (π‘Ÿ < πœ†). Similarly, if π·π‘šπ‘Žπ‘₯ > πœ†/2 and π‘Ÿ < 2π·π‘šπ‘Žπ‘₯2 / πœ†, it is still considered a non-radiative situation. However, a transfer is considered radiative if π·π‘šπ‘Žπ‘₯ < πœ†/2 and π‘Ÿ > 2πœ† or if π·π‘šπ‘Žπ‘₯ > πœ†/2 and π‘Ÿ > 2π·π‘šπ‘Žπ‘₯2 / πœ†. In terms of frequencies, the aforementioned conditions, translate to a frequency range of 10kHz-200MHz, and 300MHz-300GHz for non-radiative and radiative, respectively.

David Lee | 29/09/2021
https://www.emworks.com/blog/antenna/the-effect-of-a-meander-line-on-the-mutual-coupling-reduction-between-antenna-elements

THE EFFECT OF A MEANDER LINE ON THE MUTUAL COUPLING REDUCTION BETWEEN ANTENNA ELEMENTS

HFWorks

The miniaturization of antenna arrays imposes on the designer to place a large number of elements in a small footprint. This action gives rise to the so-called mutual coupling, which, in turn, causes crosstalk and distortion leading to the deterioration in the antenna performance and potential distortion of the radiation pattern. We won’t exaggerate if we say that such mutual coupling is the biggest obstacle to the miniaturization of antenna arrays. Over the years, antenna designers have found workarounds but with limited success. The workarounds include bandgap and ground defected structures as well as 3-dimensionncal vias.

Nesrine Selmi | 16/09/2021
By applications
By products

Upcoming Webniar

6f3ef77ac0e3619e98159e9b6febf557-home_image-28.jpg

How Safe is Wearing a Metal During an MRI Scan?

Thursday, November 04, 2021
eb163727917cbba1eea208541a643e74-home_image-28.png

An Efficient Technique to Reduce the Mutual Coupling between Antenna Elements

Thursday, November 18, 2021