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This study gives experimental results for a rectangular microstrip patch antenna, regarding its parameters and their dependence on the substrate loss tangent. Antenna was modeled to exhibit circular polarization at two frequencies of interest: 826 MHz (a frequency in the digital dividend spectrum, mainly reserved in Europe for LTE networks) and 900 MHz (a frequency in the GSM uplink band). Experimental...
The pregnant woman model is particularly complex structure involving numerous tissues with different electrical parameters. Such complex structures are generally handled by numerical methods implemented in simulation software packages. The structures involving high discretization density (mainly based on Magnetic Resonance Imaging and handled by Finite Difference Time Domain method) consume tremendously...
This study deals with the radiation pattern and impedance calculation for a quarter wavelength monopole antenna placed at the center of circular and square perfect electric conductor (PEC) ground planes. The analysis is based on analytical approximations as well as on two different numerical methods, namely the Method of Moments (MoM) and the Finite-Difference Time-Domain method (FDTD). The previously...
Electromagnetic modeling of large scale problems arising from complex geometries, such as the human body or the specific organ, is generally undertaken by numerical methods implemented in simulation software packages. The structures involving high discretization density (mainly based on MRI images and handled by FDTD method) consume tremendously high computational cost. On the other hand, oversimplified...
The paper analyzes the influence of human head and hand on planar inverted F antenna (PIFA) matching properties. Since PIFA is a very popular design in mobile applications, it is of primary importance to analyze the matching of such an antenna in real application scenarios (close to the head, grasped by the hand). Any matching deviation leads to the reduction of radiated power which should be accounted...
The parameters of antennas printed on electrically thin ungrounded substrate are usually found by simulations or by trial and error method because the value of its effective dielectric constant is unknown. In this paper the effective dielectric constant of a dipole printed on some commonly used substrates, with standard thickness and relative permittivity, was found and its eventual effect on antenna...
Radiation pattern of a commonly used vertical half-wave dipole was measured over sea. A compact setup was designed and produced based on a shallow pool filled with sea water, defining the propagation path entirely over sea. Antenna under test transmitted a wave across the pool towards the receiving antenna that measured the field strength in various positions, to obtain the radiation pattern of the...
The paper presents the design and the response measurements of the simple, one-axis diode-based electric field probe, consisting of short dipole, diode detector, low-pass filter, transmission line and monitoring instrument. Frequency response measurement results were compared to the simulation results, where simulation was achieved by a method of combining the numerical FDTD simulation with dipole/diode...
The paper presents the method for measuring antenna factor and gain of small antennas in the GTEM cell. In order to investigate the suitability of GTEM cell for this kind of measurement, the measurement results for a biconical dipole with broadband matching balun were compared with those obtained by calibration inside fully absorber lined anechoic site. The GTEM measurement results showed great agreement...
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