This paper presents a low profile dual polarized directional antenna composed of loop and dipole arrays mounted on a ground plane with each loops and dipoles being fed independently. Each loop antenna is paired with a reflector while each dipole antenna is paired with a director and a reflector. The proposed antenna is intended for an indoor base station (BS) with resonance frequency of 2.4 GHz...

This invited paper details some of the hardware modelling and impairment analysis carried out in the EU mmMAGIC project. The modelling work includes handset and Access Point antenna arrays, where specific millimeter-wave challenges are addressed. In power amplifier related analysis, statistical and behavioural modelling approaches are discussed. Phase Noise, regarded as a main impairment in mil...

The problem of designing a class of linear antenna arrays with broad nulls against interfering sign& Of variable direction of qrival is considered. The problem is formulated in an appropriate signal space selected for an efficient representation of array signals of specified angular occupancy. The array-weight vector is then chosen to be orthogonal to this space. The approach is seen to yield a...

This paper presents the characteristics of a software developed on MatLab Scripts to obtain the synthesis of radiation patterns, using linear antenna arrays. Several classical techniques have been considered such as Schelkunoff method, Fourier series and transform methods, Woodward-Lawson method, Taylor line-source methods. In all those cases, algorithms were developed and the results agree wit...

– Modern array signal processing applications place great demands on the underlying antenna array geometry to deliver high performance. This paper discusses a computational solution to an integer multicriteria optimisation (MO) problem that arises in a certain class of nonuniform linear array (NLA) design. “Fully augmentable” arrays have a full and complete set of covariance lag differences; wi...

 This paper presents emPiCASSO, a powerful electromagnetic CAD tool that provides an integrated environment for analysis, synthesis and optimization of multilayer printed antenna arrays. emPiCASSO has been built on an object-oriented foundation that allows for a systematic integration of preprocessing, processing and post-processing utilities of the CAD software. As a result, it offers a host ...

In this paper, channel capacity of multiple-input multiple-output ultra-wide band (MIMO-UWB) systems with single co-channel interference (CCI) is calculated. A ray-tracing approach is used to calculate wanted channel frequency response, and the channel frequency response is further used to calculate corresponding channel capacity. By the ray-tracing approach, two different antenna arrays are ap...

In this paper, ‘T’ character-type array antenna system is proposed which estimates the directions of arrival (DOA) by the virtual uniform rectangular arrays. The proposed system consists of 4 antenna elements distributed like the character ‘T’. The performance of the proposed system in DOA estimation is evaluated by some simulation and experiments. First we show that DOA is estimated correctly ...

In this paper, we consider a distributed virtual multiple-input multiple-output (MIMO) coalition formation algorithm. Energy savings are obtained in the reverse link by forming multi-antenna virtual arrays for information transmission. Virtual arrays are formed by finding a stable match between two sets of single antenna devices such as mobile stations (MSs) and relay stations (RSs) based on a ...

Abstract—In this paper, the problem of secure transmission in two-hop amplify-and-forward (AF) systems with an untrusted relay is investigated. To prevent the untrusted relay from intercepting the source message and to achieve positive secrecy rate, the destination-based cooperative jamming (DBCJ) technique is used. In this method the destination sends an intended jamming signal to the relay. T...