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A multi-band antenna, which consists of a diversity antenna in the DCS/PCS/UMTS bands and a MIMO antenna in the LTE17/LTE4 bands, is proposed and designed for mobile handset applications. The proposed antenna consists of the meandered PIFAs with branch lines. The radiation efficiency of the proposed antenna is higher than 30% in the LTE17/LTE4 bands and higher than 40% in the DCS/PCS/UMTS bands. The...
In this paper, a new method for increasing the total efficiency of a dual band compact antenna which usually has low values is presented. A newly-devised modified version of the SRR (Split Ring Resonator) is used to create another band with a higher total efficiency compared to those of the two bands and establish a configurable shift mechanism so as to merge it with the lower band of the original...
A compact inverted-F antenna with multiband operations for LTE, WWAN, WiMAX and WLAN applications is presented. The antenna consists of multi-branch strips and is fabricated on both sides of the ceramic substrate, which has a compact size of 90(L)×10(W)×0.5(T) mm3 to be embedded inside an ultra-thin laptop computer as an internal antenna. Three operating bands covering 673–993 MHz, 1673–3153 MHz and...
In this paper, a 2.4/5-GHz dual-band planar inverted-F antenna (PIFA) design is proposed. Compared to existing dual-band PIFAs, the antenna offers the advantage of a simpler and more compact design. The PIFA is designed for wireless local area network (WLAN) applications at 2.4 GHz (2.40–2.48 GHz) and 5 GHz (5.15–5.85 GHz). The size of the antenna is 94×50 mm, which makes it suitable for portable...
A new planar antenna with double access and three separated bands is presented in this article. The first access operates over two bands, a narrow band for GPS standard (1.575 GHz), and a wideband covering PCS (1.85–1.99 GHZ) and UMTS (1.92–2.17 GHz) standards and also six sub-bands between (1.85–2.025 GHZ) intended to be used on the new norm 3GPP (LTE). The second access operates over a wideband...
In this paper, a novel and compact dual-band planar monopole antenna with well-tuning mechanisms of each individual band is proposed. This antenna is fabricated on a low-cost, easily available FR4 substrate by using etching or milling machines. The lower operation frequency can be adjusted to cover GSM 1800 band (1805 – 1880 MHz), and the upper band covers Worldwide Interoperability for Microwave...
The concept, design procedure, and measurement results of a monopole slots antenna that operates at both GPS and Iridium frequencies of 1.575 GHz and 1.62 GHz with circular polarization and GSM850/GSM900/DCS/PCS bands with a vertical linear polarization are presented. The antenna structure is based on an L-shaped monopole slot to generate a wideband circular polarization [1]. With the integration...
We have already proposed an adaptive antenna of VHF band for the vehicle using the defogger. The defogger is used as the shared aperture by implementing several ports. In addition, by introducing the ESPAR concept, adaptive beam pattern can be formed with single receiving channel. In this paper, we present by numerical simulation that the proposed antenna has broadband characteristics and the degradation...
This paper presents several antenna topologies for intra-vehicle communication in the unlicensed 2.45 GHz ISM band (2.4 GHz – 2.485 GHz). The antennas are implemented using flexible foam materials compatible with the production process of dashboards, as dashboards offer a large platform for easy and unobtrusive integration. In order to obtain the optimal intra-vehicle antenna, the different topologies...
Vehicular communications, among vehicles and between vehicles and infrastructures are based on wireless communication technology known as dedicated short range communications (DSRC), which are in great development with the aim of reduce the traffic problems and improve the road safety. This study is based on the development of a solution to an antenna to be used in the mobile module, usually named...
We study the impact characteristic and the performance of composite surface antenna (CSA). The antenna, which operates in GPS band (1.575 GHz) and DMB band (2.635 GHz), was embedded in composite sandwich structure consisting of glass/epoxy laminate, carbon/epoxy laminate, adhesive films and nomex honeycomb. When 20 J of impact energy was applied to arbitrary points on the antenna, the maximum contact...
Objective comparisons of different FM-reception systems with FM-antenna diversity systems are important for optimization and development. An advanced analyzing and evaluation system for FM-antenna diversity systems is introduced. With the possibility to record real FM-signals and the preprocessing of FM-signals, which takes into account the influence of the reception scenario and the diversity antennas,...
In this paper, the satellite coverage of GPS antennas on a small, highly dynamic spinning projectile is investigated. Since the projectile has varying pitch and roll, the antenna needs to have omni-directional coverage. A patch antenna is selected as the basic element, but it by itself cannot provide the necessary coverage. To obtain the desired coverage, multiple elements are placed around the circumference...
This paper presents simulations and experimental analysis of the electromagnetic propagation and of the field distribution generated in and around a tire by a sensor node operating in ISM and UWB (4.5 GHz) bands.
A 77-GHz slot array antenna with a single-mode post-wall waveguide is presented for automotive radars. First, transmission losses and fabrication costs of various transmission lines in millimeter-wave band are compared. The measured transmission loss in the 77-GHz post-wall waveguide integrated in a PTFE substrate at 77 GHz is shown 0.20 dB/cm, which is less than that of the microstrip line. Then,...
This paper proposes the design of a thin-strip on-glass antenna for a DAB automotive application. The proposed antenna uses a triangular thin-strip monopole as a radiating element, including a ground strip matching technique to obtain an improved impedance matching. The antenna radiation pattern, reflection coefficient [∣S11∣ (dB)], polarization, and absolute gain in the operating frequency band are...
Ultra wide-band (UWB) radar is an attractive technology in a variety of applications including security systems. In that pursuit, it is essential to develop low-cost systems that produces clear target images. We have recently developed an imaging method for a simple radar system with a single antenna, namely the frequency-domain DORT (French acronym for decomposition of the time reversal operator)...
In this paper, we present a three-dimensional model-based inversion algorithm for inverting electromagnetic data. In this approach, the shapes of the models are described by points and the so-called radial basis functions are used as the interpolation function connecting these points. The use of the radial basis functions renders the surfaces intrinsically smooth so that in the optimization process...
A model-based inversion algorithm is presented within the contrast source formulation of the inverse scattering problem. The inversion technique assumes that the scatterers at hand are limited to small areas within wide investigation domains or that they can be expressed in terms of very few unknown coefficients thanks to suitable representation bases. Accordingly, the associated inverse problem is...
The finite-difference time-domain (FDTD) method is used to calculate the specific extinction cross-section (SECS) of the carbon-fiber powder at 35 GHz. The digitized models with a random process using the turning bands method are simulated for the carbon-fiber powder. The digitized models of the carbon-fiber power having 12500 to 5832000 cubical particles with sell sizes in the range of 7 to 100 µm...
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