A compact planar wideband microstrip antenna is introduced. The a log-periodic with 7 dipole elements. designed to function in the frequency range of 500 700 MHz. It has dimension 268 mm by 145 3 mm. matching better than -10 dB working bandwidth. proposed generates linear polarization. Its maximum gain 4.5 at central frequency. provides low-cost alternative conventional Yagi-Uda TV antennas

Ground penetrating radar (GPR) is a viable tool for fast and high fidelity detection of concealed explosive threats. The effectiveness limited by scattering from rough terrain which considerably obscures the buried target response. To calculate ground scattering, 3-D full-wave algorithm such as finite-difference frequency-domain (FDFD) method required but often prohibitive multiple frames when GPR antennas are distant region. This paper presents real-time modeling moving platform...

Fast detection of hazardous objects in millimeter-wave personnel screening can increase the operating efficiency secure environments. In airports, accurate automatic and classification body-worn reduce number pat-downs while keeping transportation environment safe secure. Since many benign objects, such as paper leather, are lossy materials, being able to characterize them set aside from secondary checks will significantly process time. this article, we introduce an effective...

The efficiency and effectiveness of airport security can be improved through fast high-fidelity detection concealed threat objects. If detected objects accurately characterized, the number false alarms will reduced, whereas terrorist threats more quickly noticed apprehended. This article aims to characterize physical properties weak dielectric (such as explosive threats) covering a conductive plane human body) using single-frequency millimeter-wave (mm-wave) radar system with Fresnel...

Accurate characterization of suspicious body-worn objects may speed up the passenger screening process by reducing number manual screenings, while also maintaining ability to detect more complex threats. This improves experience in preserving strong security. paper presents an innovative real-time method for millimeter wave nearfield radar reconstructing nominal contours human bodies without affixed foreign objects. important step is required characterizing unique aspects concealed when they...

In this paper, an efficient analytical method for characterizing large array of plasmonic nanoparticles located over planarly layered substrate is introduced. The model called dipole mode complex image (DMCI) since the main idea lies in modeling a subwavelength spherical nanoparticle at its electric scattering resonance with induced and representing electromagnetic (EM) fields terms finite images. major advantages proposed are accuracy rapid calculation various kinds periodic aperiodic...

Asthma is a common respiratory disease with huge economic burden leading to activity limitations, morbidity, and mortality. In this study, we aim investigate the prevalence of Oppositional Defiant Disorder (ODD), Attention Deficit Hyperactivity (ADHD) Conduct (CD) among children asthma. This case-control study was performed in pediatric referral health care center (Children's Medical Center Tehran University Sciences) 2017.With random selection, 80 asthma 92 controls age range 5 11 years...

A novel closed form expression is derived for spatial Green's functions of microstrip structures by expanding the spectral function into a Gaussian series. This innovative method called (GGF) due to in representation. The main advantage GGF lies its precision as well rapid convergence. To demonstrate versatility this method, current distribution antenna achieved via combination moments (MoM) and method. It shown that can be computationally very efficient with less than 1% error compared...

Efficient characterization of concealed person-worn objects enhances the security air travel and reduces inspection time.Mm-wave nearfield radar can detect metallic such as guns or knives, well water-based materials that might be associated with peroxide threats.However, it cannot discriminate these potential threats from benign to decrease nuisance alarm rate.Moreover, distinguishing in presence human skin is even more challenging.The authors have previously developed a method using mm-wave...

Ground penetrating radar analysis of reinforced, layered concrete bridge decks requires fast, fully three dimensional modeling for and inversion measured data. However, numerical methods are often computationally expensive impractical real-time use. 2D is but lacks a comprehensive the problem. Here, we develop test an analytic method to effectively simulate deck reinforced by grid rebars, excited air-coupled GPR. The Green's function in combination with moments (MoM) utilized efficiently...

A major problem with forward-looking ground-penetrating radar (FLGPR) detection of buried explosive threats is the scattering from rough ground surface. The authors have previously developed a real-time 3-D algorithm for single-view emulation synthetic aperture FLGPR terrain at low grazing angles. This article extends method to simulation multiview moving platform transmitter/receiver array as fast 15 km/h. need perform new calculation every frame antenna shown be unnecessary, requirement...

In order to improve the speed of passenger screening while preserving effective capability detect more sophisticated threats, airport security imaging systems must be able accurately characterize concealed body-worn objects. addition improving experience, this system will enhance for traveling public. This article presents a real-time, fully automatic algorithm wideband millimeter-wave (mm-wave) radar reconstruction nominal human body contours, even in presence an affixed weak dielectric...

Ground penetrating radar (GPR) is a viable tool for fast and high fidelity subsurface identification of buried landmines improvised explosive devices (IEDs). The greatest barrier in GPR surveying systems the obscuring effect rough surface clutter. finite difference frequency domain (FDFD) method can be used to calculate scattering terrain. A full 3D FDFD analysis required but computationally burdensome when antennas are distant from target region. We present an efficient hybrid forward-model...

Ataxia telangiectasia (A-T) is a common, genetically inherited cause of early childhood-onset ataxia that classically characterized by progressive cerebellar malfunction, oculocutaneous telangiectasia, genome instability, and immunodeficiency. There vast phenotype variation in patients with A-T recently, dystonia, an extrapyramidal movement disorder. Here, we report the case 10-year-old girl who had experienced repeated diarrhea mild gait since age two years. At seven, ocular were evident...

This paper proposes a method for determining permittivity and thickness of body-borne objects automatically by processing wideband radar images. The algorithm can be used to find the explosive threats rule out benign objects. Having reconstructed millimeter wave image body with an anomaly attached it, we extract nominal contour, which shows surface in absence object, then subtract ideal response from define amount displacement observed is caused signal retardation due presence weak...

Abstract Precise characterization of concealed person-worn objects will speed up the passenger screening process by reducing rate nuisance alarms, while also enhancing airport security imaging systems. This paper presents an automatic, real-time method for wideband millimeter-wave radar identification nominal surface contours human body – even with affixed foreign or when a segment cross-section is not captured without relying on body's bilateral symmetry. The developed verified...

Building on a previously developed virtual-source model for loss-less dielectric slabs attached to metallic planes, we present fast focused raster scanned spot continuous-wave (CW) method find the thickness, permittivity, and loss-tangent of lossy that could potentially be explosive threats. A library reflection responses objects with different sizes electric properties is precomputed, an inversion algorithm incorporates measured data predict object features. It shown this characterization...

In this paper, a novel closed form expression is derived to find the Green' s function of horizontal electric current in parallel-plate waveguide. It achieved by expanding into series Gaussian functions. This new method called (GGF) method. The main advantage GGF lies its precision as well rapid convergence. Numerical results confirm that yields less than 0.2% error compared numerical integration spectral integral. Furthermore, it verified can be excellent agreement with complex images (CI)

Ground penetrating radar (GPR) is a viable tool for fast nondestructive sensing of concrete structures. The finite difference frequency domain (FDFD) method can be used to simulate subsurface wave scattering. A full 3D FDFD preferred in general but computationally burdensome. In this paper, we study deteriorated bridge decks via comprehensive analytic method. Green's function analysis combination with the moments (MoM) effectively model layered structure an embedded grid rebars. scattering...

This paper presents an efficient technique for modeling large array of plasmonic particles deposited on layered substrate, offering energy-efficient solar-systems. Dipole mode (DM) theory along with complex image (CI) will characterize the performance successfully.

Fast and accurate characterization of concealed threats benign objects is great importance for increasing the efficiency mm-wave imaging radar personnel screening systems in airports. Correctly classifying low-loss lossless materials essential detecting threats. Previous work developed a real-time, fully automatic algorithm characterizing lossy vs. materials. This paper extends image-processing-based method to distinguish media, such as materials, that include explosives. The verified...

Distinguishing benign materials from potential hazards is an essential step in speeding up the personnel screening process airports. In our previous works [1], [2], we have introduced automatic algorithm for characterizing lossless and lossy materials. This paper proposes a method having more accurate characterization by automatically tuning parameters lossless, low-loss, mediums. The approach applied to previously developed algorithm. Having location of body-worn object on 2D reconstructed...

The spatial Green's function of the open microstrip structure is usually represented by time-consuming and computationally inefficient spectral integral. This paper introduces a new closed form for applying GGF method. Therefore, numerical integration integral can be avoided entirely, leading to considerable decrease calculating time. Owing remarkable resemblances between CI methods, improvement approximation especially in large distances, some useful techniques such as extraction surface...