This paper describes an outdoor MIMO measurement campaign conducted in the 2GHz band employing a sounding bandwidth of 20MHz. The study aimed to compare the MIMO performance of two prototype devices with a reference dipole antenna module. The results obtained reveal a systematic blocking of one of the PDA antenna ports with the user’s thumb alongside a significant reduction in the available MIM...

We describe a means for improving the coupling of illumination to, and the collection of scattered radiation from, an optical antenna. This is achieved by integrating optical antennas with concentric ring gratings. Electromagnetic simulations demonstrate that the ring grating improves the coupling to the antenna, even if the incident illumination is focused by an aplanatic lens such as a micros...

In this note we discuss a technique for definin”g the geometry of ~:$ipole antenna such that low-frequency parameters of the antenna, such as capacitance and mean charge separat~on distance, are readily calculable. This technique involves the assumption of an appropriate static charge distribution which we call an equivalent-charge distribution. Calculating the potential distribution from the e...

In this paper, a balanced antenna for mobile handset applications with enhanced bandwidth performance, that covers four bands (GSM1800, GSM1900, UMTS and 2.4-GHz WLAN), is investigated. The antenna is a slot planar dipole with folded structure and a dual-arm on each monopole. A wide bandwidth planar balun is employed to feed the wideband balanced antenna from an unbalanced source. A prototype o...

This paper describes the characteristics of a software developed on MatLab Scripts to obtain the radiation patterns of linear antenna arrays using dipoles as the elements. The software includes, among several other options: the analysis and design of arrays with progressive phase, arrays with non uniform amplitude excitation and arrays with non uniform separation. Some special attributes of the...

This paper increases directivity and gain of Small Planar Dipole Antenna (SPDA) by using Symmetrical Pyramidal Block (SPB) which operates in X band at 11 GHz. The SPB consists four sides; each of which is metamaterial with Epsilon Negative Medium (ENG) and Epsilon Near-Zero (ENZ). The results simulated using the High Frequency Structure Simulator (HFSS) show that the SPB is capable of enhancing...

An Unmanned Aerial System (UAS) has been developed which is based on an aerodynamically functionalized planar wideband antenna. The antenna utilizes a planar circular dipole metallization scheme. The aerodynamic structure implements a planform similar to the Nutball flier, a hobbyist flight architecture. The resulting codesign achieved a large impedance bandwidth defined by a voltage standing w...

Several diversity techniques employing multiple antennas in the base station have been developed for mobile communication systems. However, the performance of diversity methods strongly depends on the correlation between antenna elements. When multiple co-polarized antennas are used in base station, the practical factor limiting the number of diversity branches is the required antenna separatio...

A comparative investigation is performed for examining the radiation characteristics of a dipole antenna array on multilayered bianisotropic substrate with a grounded soft and hard surface possessing certain direction of the conductivity. Eight continuous magnetic groups of symmetries for describing the constitutive features of such bianisotropic structure are considered, respectively. Numerica...