Near-Field Wireless Power Transfer systems have attracted attention for their potential applications, such as implanted medical devices, radio frequency identification, and portable electronic devices in general. In this context, a compact model short-range NF-WPT operating ISM bands is proposed, employing the concept of ground plane aperture resonators or Defected Ground Structures (DGS). This...

This paper is dedicated mainly to the study of couplings between planar resonators in multilayer structures with modified (defected) ground plane. Couplings between two miniaturized resonators are investigated, by full electromagnetic field simulation. Based on the results of this study, several models of planar microwave bandpass filters, with a single or with two apertures, are designed, veri...

This article presents analysis approach and applications of symmetrical three-conductor coupled microstriplines with aperture in the ground plane for the design of microwave filters. Analysis is based on splitting the entire symmetrical three-conductor coupled line structure into simple two-conductor coupled lines. Various possible terminations have been shown in three-conductor coupled lines t...

An unequal Wilkinson power divider with adjustable power dividing ratio is proposed. The proposed power divider consists of rectangular defected ground structure (DGS), isolated island in DGS, and varactor diodes. The impedance of the microstrip line greatly increases due to the DGS, and varies because of the varying capacitance of diodes. The measured unequal dividing ratios vary from 1.97–13....

This paper presents analysis and design of a compact ultra wide band (UWB) filter using three parallel folded coupled lines in a defected ground structure in multi-layer structure. Defected ground has been incorporated under the coupled lines of the filter to improve the coupling over a wide bandwidth. The closed form expressions for even and odd mode impedances for the coupled lines with defec...

Microstrip antennas have numerous advantages such as small size, low fabrication cost, light weight and can be easily installed in the systems and it finds its applications in various systems like aircraft, satellite and spacecraft. But it has drawback of narrow bandwidth. To overcome this drawback, Microstrip Antennas with Defected Ground structure can be used. In this paper, a microstrip patc...

In this paper, we propose various defected ground structures (DGS) for improving the return loss and impedance bandwidth of an ultra wideband antenna. A comparative parametric analysis has been made on the basis of return loss, gain, radiation pattern characteristics and impedance bandwidth. Simulation results are analyzed and presented for an ultra wideband antenna with four slots in its radia...