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As recommended by 5th generation Public-Private Partnership (5G-PPP) and Next Generation Mobile Networks (NGMN), one of the most important 5G requirements is to minimize the delay within the network for delay-sensitive services. Main objective of this work is to exploit massive MIMO technology to reduce Hybrid Automatic Repeat Query (HARQ) retransmission delay. Massive MIMO indoor environment is created...
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...
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...
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...
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...
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...
This paper proposes a novel multiband Wearable Fractal antenna which suitable for GPS, WiMax and WiFi (Bluetooth) applications in the same time. This antenna is designed to operate at four resonance frequencies are 1.57, 2.7, 3.4 and 5.3 GHz. The proposed wearable antenna may be attached to life jacket to aid for finding the human body if an accident happened so, the specific absorption ratio (SAR)...
This paper introduces a novel dual band shorted square patch, with E-shaped slot and improved radiation properties at GSM and WLAN frequency bands (1.8GHz and 2.4 GHz). The shorted part is designed to operate with a ground plane which is a significant part of the antenna assembly. The proposed antenna has been fabricated on FR4 substrate and has been simulated beside SAM (Specific Anthropomorphic...
In this paper a novel nanoparticle structure has been presented to be used in plasmonic photovoltaic to enhance its efficiency. The proposed structure is a silver gear structure that is expected to make good enhancement of light absorption inside the semiconductor forming the photovoltaics (PV) in the visible range of frequencies (200–800 THz). The nano antenna particle is embedded inside the photovoltaics...
In this paper, we present a micromachined dipole antenna with parasitic radiator. The antenna is designed for operation at 60 GHz. It consists of two Ig/2 dipole radiators fed by coplanar strips waveguide. Two slightly shorter dipoles are placed in proximity to the main radiators. They act as parasitic dipole arms which increase the bandwidth of the antenna. Two versions of the same antenna topology...
A reconfigurable radiation pattern loop antenna is presented in this paper. The loop antenna operates at 2.4 GHz (WLAN/ Bluetooth /LTE/UMTS) having an omnidirectional radiation pattern in the antenna plane. The reconfigurability is achieved using; primary loop antenna that is surrounded by secondary ones which are used to cancel the current and hence the radiation pattern in their direction. Accordingly,...
In this paper, a new miniaturized wide Band-Pass Substrate Integrated Waveguide (SIW) filter is proposed. The miniaturized design is based on two techniques, combining the Slow-Wave and Half-Mode SIW principles. Also different substrates for each layer with high contrast in the effective permittivity are used. This technique shows that the SIW filter is 90% miniaturized with a bandwidth covering the...
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