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The rigorous moment method analysis of probe-fed rectangular dielectric resonator antenna on a finite ground plane and finite substrate is presented. The antenna and the ground plane are modeled as a linear and surface electric current, but the dielectric and the substrate are assumed as a volume polarization current The dielectric resonator (DR) is treated via a set of combined field integral equations...
The aim of this paper is to present a new synthesis method based on spherical harmonics optimization. In previous works, this method has shown a remarkable effectiveness for E-field estimation around real base station antennas which are formed as linear array. The presented work extends our method to the modeling of some antennas which are different from the classical base station antenna. By testing...
This paper describes the design, implementation and characterisation of a uniform circular sector antenna array which has been used for extracting various mobile radio channel parameters. The proposed set-up permits the extraction of angular information using a sectored antenna array configuration. In this paper, the potential capability of the sectored antenna array for DOA (direction-of-arrival)...
As a conclusion, the software IDRA based on UTD provides an efficient solution for fast evaluation of the radiation pattern of an antenna mounted on an electrically large carrier, or of the coupling between two antennas in a complex environment. Coupled with a set of optimisation utilities, it is an optimal tool for antenna implementation on structures.
A design of triple-feed equilateral-triangular microstrip antenna for circular polarization (CP) is proposed. In this design, by feeding the patch through three points and applying proper phase differences between the feeds, CP with axial ratio close to 1 can be achieved. Finite Difference Time Domain (FDTD) method has been applied to analyze this microstrip-fed antenna. The return loss, input impedance,...
This study was performed on slot loaded microstrip patch antennas. Slots reduce antenna resonant frequency and are used for antenna miniaturization. However, as the antenna size is reduced, the feeding becomes more difficult, and input impedance becomes more sensitive to the feed location. In this paper the effects of feed location on input impedance and bandwidth of two types of slot loaded patch...
A symmetrically half section of a hemispherical dielectric resonator antenna (DRA) has been studied and proposed as a novel broadband antenna. The input return loss characteristics, associated resonant modes and their field patterns and the radiation characteristics over the operating band of a probe-fed DRA have been investigated using Ansoft HFSS solver. Suitable radiation patterns with nearly 40%...
A new system based on five-port reflectometers, which measures simultaneously direction of arrival (DoA) in azimuth plane and propagation time of arrival (ToA) of incoherent signals and coherent signals for indoor communication applications is presented in this paper. The receiver operating at 2.4 GHz consists of seven five-ports and a Uniform Linear Array (ULA) of seven quasi-Yagi antennas. The data...
Studies on the narrowband characterization of the on-body propagation channel show variations of up to 40dB in link loss for different antenna position and body posture. Channels on the body trunk show small variance of the path gain probability density function, whilst those involving the arms or legs a much greater variance. For most cases the monopole antenna located with the ground plane parallel...
An analytical solution is presented for the induced currents in highly conducting prolate and oblate spheroids due to the presence of an external axisymmetric inducing field produced by carrying-current circular turns. Exact analytical expressions are derived for the magnetic vector potential, the power losses and the forces acting upon the spheroids. The magnetic vector potential outside and inside...
This paper presents the Simulink implementation of a Multiple Input Multiple Output (MIMO) beamforming system based on the code filtering approach (CFA) and Alamouti's transmit diversity. This model can be used as a platform to test the use of DSPs/FPGs in new generation of MIMO-beamforming systems and will allow evaluating the Bit Error Rate (BER) and the beampattern performances. This goal is achieved...
A novel fractal shape is introduced as a miniaturized microstrip patch antenna. Also by applying a new feeding method, wide impedance bandwidth is achieved. Measured and simulated results are in good agreement and show 68% size reduction (compare to a square patch) and up to 27% impedance bandwidth.
In this paper, a frequency reconfigurable antenna using the ON/OFF states of a MEMS (Micro-Electro-Mechanical System) switch, is presented. This structure is based on a multifrequency planar inverted-F antenna (PIFA), designed with an L-shaped open slot etched upon its main plate. As a proof-of-principle, an ON state RF MEMS switch, modeled by a piece of copper of 1×1mm2, is inserted into the slot...
This paper deals with a numerical approach to compute thin wires with FDTD in dispersive materials. An original method has been carried out to extend classical thin wire formalism to frequency-dependent media.
Enhancing gain through double-superstrate configuration for microstrip patch antennas has been studied. Numerical results indicate that using double-superstrate configuration will increase the directivity remarkably, even with moderate superstrate dielectric constants. It also takes the advantage of wider bandwidth. It is shown that by using superstrates with relative permittivity of 3, directivity...
In this paper, the complex 3D farfield radiation pattern of a two branch circular patch antenna with polarization diversity is studied. Farfield coupling (FFC) magnitude [1] is extracted for 3D and azimuth plane radiation patterns; the diversity antenna correlation coefficient (ρe) is calculated from farfield coupling magnitude for space angles.
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