In this study, the authors present a thin wideband electromagnetic planar absorber for X- and Ku-band, which also has polarisation-sensitive transparent window at frequencies lower than L-band. The design is based on two-layer capacitive circuit with back-metal layer replaced frequency-selective surface. structure studied normal incident waves two orthogonal linear polarisations. optimised to gain high transparency low one of polarisations same time good absorption efficiency both...

The recently developed dumb-bell shaped defected ground structure (DGS) is successfully used to mutual coupling reduction of a two-element microstrip antenna array. Comparison the proposed DGS with other techniques shows unique capability reduce coupling. Influence designed on radiation pattern array also investigated

A novel circularly polarized cylindrical dielectric resonator antenna excited by an external tape helix is presented. The fed a coaxial line through small hole on finite size ground plane. configuration offers compact and easy to fabricate feeding network providing 3 dB axial-ratio bandwidth of 6.4%. prototype the proposed fabricated measured. Measured simulated return loss, axial-ratio, radiation pattern, realized gain are presented discussed together with design guidelines.

A semicircle arc projection is introduced to miniaturize the patch in circular microstrip antennas. The idea has been inspired from effectiveness of a cuboid ridge size reduction rectangular antenna. prototype proposed antenna together with conventional fabricated and measured. two antennas are compared, results presented discussed. parametric study also carried out on characteristics projection.

In this letter, we use a helix to excite two orthogonal HE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11δ</sub> modes in phase quadrature hollow cylindrical dielectric resonator antenna generate circular polarization. As compared our previous work, it is shown that replacing the with cylindrical-shaped one leads significant enhancement 3-dB axial-ratio bandwidth. A design guideline provided, and three cases are presented. prototype for of...

An effective approach to reduce the patch size in rectangular microstrip antennas is presented. The proposed based on inductively loading using a cuboid ridge. A theoretical background of transmission line model has been provided. prototype antenna fabricated and measured. results, advantages limitations are presented discussed.

A Jaumann absorber with its metal backing replaced a combined low-pass and polarizer FSS is investigated respect to absorption polarization-dependent low-frequency transparency properties. This structure applied an idealized curved wing-front end, monostatic radar cross-section determined. The FSS-Jaumann preserves similar the planar in higher frequency interval enables partial TE z polarization at 1 GHz. In addition, once significant reduction two-dimensional for both TM over 2–16 GHz...

A full-wave analysis for determining the resonant frequency, quality factor and far-zone radiation patterns of a circular disk annular ring microstrip patches, printed on uniaxial anisotropic substrate is presented.Green's functions structure are determined in Hankel transform domain (HTD) using Hertz potential vectors.Galerkin's method, together with parsval's relation then applied to compute frequency factor.The expressed terms transforms tangential fields substrate.Wave equation solved...

A study of a novel method to detect mechanical deformations windings in power transformer, while operation, is presented. We employ an approximate model transformer winding surrounded by the transformer-tank wall and magnetic core. T

In this paper we present a comparison of two methods for radar cross section reduction (RCSR) wing-front profile. The aim is to reduce RCS over the frequency range 1-16 GHz in forward sector traveling direction. We achieved 5 dB dimensional mono-static (RCS) 68% (or more) band polarization with electric field parallel wing surface (TM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">z</sub> ). It shown that Jaumann screen has better RCSR...

A novel approach to diagnostics of transformer winding deformations, caused by mechanical forces from short-circuit currents, is presented. We employ a simple model as two-dimensional parallel plate waveguide. The upper represents the tank wall and lower iron core which carries magnetic flux. Between two plates, we set conductors. utilize commercial simulation software simulate generation measurement microwave radiation at both ends structure. interacts with metallic structures in measured...

We designed a partially transparent Jaumann absorber. The metallic sheet of the was replaced by triangular lattice Gangbuster FSS together with polarizer. This design applied to wing front end. showed that monostatic RCS performance improves. Furthermore, resulting screen is around 1GHz which assumed be an antenna operating frequency placed inside wing. However resistive layers absorber cause large loss at 1 GHz for planar case. To reduce this loss, additional work in progress where...

Stacking method is used to enhance the 3 dB axial ratio and impedance bandwidth of circularly polarized cylindrical dielectric resonator antennas excited by an external tape helix. In this method, a cylinder with lower permittivity than basement placed concentrically on top cylinder. The new configuration offers up 11% 31%.

In this paper we compare radiation patterns and mutual coupling in finite infinite square lattice arrays of dielectric resonator antenna (DRA) elements. The array elements are cavity backed, slot fed cylindrical DRAs that utilizes the HE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11δ</sub> mode. It is observed degree for non-edge very close to between corresponding array. However, a large difference center element two corner with respect...

Microstrip patch antennas are popular as they simple to design and directional which allow them be placed in close proximity other objects. These traditionally made from etching printed circuit boards. However, new emerging manufacturing techniques applications include additive manufacturing, 3D printing textile geometries considered. It is only convention that determines the substrate should have a uniform thickness. widely known electric fields microstrip antenna not therefore this could...

A full-wave analysis for determining the resonant frequency and quality factor of a circular patch microstrip antenna printed on uniaxial anisotropic substrate is presented. Green's functions structure are determined in Hankel transform domain (HTD) using Hertz potential vectors. Galerkin's method, together with parsval's relation then applied to compute factor. Wave equation solved cylindrical coordinates estimate basis function. The numerical results show that there substantial deviation...