Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
A wide-band Quasi-Yagi antenna with loop excitation and a performance comparison between a dipole based Quasi-Yagi are presented, targeting the 5.8 GHz band. The proposed Quasi-Yagi antenna with loop excitation has a very wide measured bandwidth of 1.43 GHz which covers from 5.574–7 GHz. It has a very high Front-to-back ratio (FBR) of 18.7 dB with a ground size of 11 mm. The proposed antenna has a...
Chronic wounds affect millions of patients around the world and requires a major portion of health care budget for treatment. In this article, we present an unprecedented low cost continuous wireless monitoring system, realized through inkjet printing on a standard bandage strip, which can send early warnings as well as record long term wound progression data. The smart bandage can communicate upto...
The gain of an antenna can be enhanced through the integration of a lens, however this technique has traditionally been restricted to planar antennas due to fabrication limitations of standard manufacturing processes. Here, with a unique combination of 3D and 2D inkjet printing of dielectric and metallic inks respectively, we demonstrate a Fresnel lens that has been monolithically integrated to a...
Inkjet printing or printing for realization of inexpensive and large area electronics has unearthed as an attractive fabrication technique. Though at present, mostly the metallic inks are printed on regular microwave substrates. In this paper, a fully printed multilayer fabrication process is demonstrated where the substrate is also realized through printing. A novel Fe2O3 based magnetic ink is used...
This paper presents a systematic and efficient approach for design of a dual-mode antenna. In this approach, characteristic mode analysis is performed on the antenna structure to assess the suitability of the proposed structure for wideband dual-mode operation. After its suitability is assessed, a parametric study is performed on characteristic modes of the structure to extract some guidelines for...
This is an era of wearable gadgets which demands flexible and wearer friendly wireless components. This paper presents a modified inverted-F antenna (IFA) which has seamlessly been integrated with the fabric through inkjet printing. Surface roughness of the textile has been reduced using a rapid UV curable flexible interface layer. Smooth interface layer helps achieving very fine features which may...
The main objective of this paper is to design a very directive reflectarray antenna (RA) for biomedical imaging applications and breast cancer detection. The RA consists of a horn antenna as a feeder and a reflection surface based on double ring (DR) unit cell that achieves 350° phase range at a resonant frequency of 2.2 GHz. The designed RA is a pencil beam antenna with a high directivity gain of...
In this paper, a new strategy for designing compact Circularly-Polarized (CP) arrays is proposed. This approach consists of using small parasitic superdirective arrays as unit elements. An array is designed for 866MHz RFID band and a parametric analysis on the inter-element distance is performed to highlight the trade-offs between the antenna-dimensions, -directivity and radiation efficiency. For...
Two circularly polarized open loop antennas, backed by square patch AMC ground planes and operating at the GPS Li band are presented. The first one is fed by a co-planar waveguide (CPW) and the second one is fed by a vertical probe. The CPW antenna has provided measured S11 and AR bandwidths of ∼11% and 6% respectively compared to ∼21% and 5% for the vertical probe fed antenna. Both antennas have...
This paper presents a new method for extracting relative complex permittivity (εr) of dielectric materials by eliminating calibration standards. To validate proposed method it is compared with well known three techniques in literature. All measurements are done by using waveguide measurement techniques which is broadband over X-band (8.2GHz–12.4GHz) frequency range with VNA. While these three methods...
This paper introduces a miniaturization technique of a microstrip Wilkinson power divider while enhancing harmonic suppression. This technique based on substituting the quarter wavelength microstrip lines employed in conventional Wilkinson power dividers with Inductive loaded microstrip line which consist of two inductors and a microstrip line. Through ABCD matrix the general design equations for...
This paper presents a step-by-step procedure to extract the effective permittivity of dry and wet snow in an electromagnetic simulator. The S-parameters are extracted using HFSS (High Frequency Structure Simulator), which is a Finite Element Method (FEM) full wave simulator. The permittivity curve is calculated using the S21 retrieval method. The calculated permittivity is compared with theoretical...
In this paper, characterization and dosimetry for two Transverse Electromagnetic (TEM) cells by measurements and simulations at the frequency of 1800 MHz are presented. The characterization consists of assessing the S-parameter and the dosimetry consists of getting the Specific Absorption Rate (SAR) values for two TEM cells with 20 cm and 40 cm length. Two Petri dishes put inside the TEM cells and...
This paper presents a measurement campaign carried out at 3.5 GHz. The objective is to characterize the electromagnetic waves propagation in indoor environment. A double directional channel sounder was used to perform these measurements. The collected data were then processed with a high resolution algorithm to extract the multipath parameters. A comparison between measurement results and a ray tracing...
In this paper, an optimum design of a novel non-uniformly excited planar array is presented by the use of Invasive Weed Optimization algorithm. In the proposed planar array, elements are arranged in a bee-hived configuration and positioned in XY plane producing a symmetrical pattern in every φ cut. The optimization algorithm is utilized for determining the amplitudes and phases of array elements to...
In this paper, the Theory of characteristic modes (TCM) is used for analyzing the behavior of a defected ground structure (DGS) as an Isolation enhancement method for Multi-Input-Multi-Output (MIMO) antenna systems. For analysis purposes a MIMO antenna system consisting of PIFA elements is used. Modes of the antennas were analyzed and the modes contributing to coupling were blocked by the DGS. The...
This paper presents a circularly polarized antenna based on new electromagnetic band-gap material antenna approach called pixel. The pixel concept was published in many papers concerning the agile radiating matrix antenna. In this paper we study the pixel generating circularly polarized field. This study will be the main step to introduce agility in beam forming of the matrix antenna for the space...
A new compact multiband resonator based on one modified cell of dual-composite right/left-handed microstrip structure is presented in this paper. This introduced topology proposes triple band for 7.4 GHz, 9.2 GHz, and 13 GHz with insertion loss 2.3 dB, 0.6 dB, and 0.55 dB, respectively. Moreover, the return losses are equal 13 dB, 43 dB, and 10 dB, respectively. The paper elaborates the equivalent...
In this paper, we study the characteristics of linear co-prime arrays (CPAs) from an array factor (AF) perspective. We start by deriving an exact expression for the array factor and compare it with the approximate formula in [1] as well as that of a uniform linear array (ULA). This is followed by comparing the AF of CPA of ideal (isotropic) elements with an actual implementation considering Dipole...
A compact dual ultra-wide band power dividers based on three cells of dual composite right/left handed microstrip structure presented in this article. This introduced topology proposes dual band for multiband orthogonal frequency division multiplexing from 1 GHz–4.8 GHz with insertion loss −5 dB for three way power divider. The second band designed for direct sequence ultra-wideband from 6.2 GHz–9...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.