S E P T E M B E R / O C T O B E R 2 0 1 5 www.insidegnss.com A GNSS single-antenna system can be compared to a singlepixel camera. Electromagnetic waves traveling 20,000 kilometers from every overhead direction can reach us. Yet once at the antenna, this diverse set of information is collapsed into a single magnitude and phase value, then sent off to the receiver so that value can be extracted....

Software radio or software defined radio (SDR) is a quite attractive field of research in terms of theoretical crossover research themes between radio engineering and computer science in academia as well as new multi-standard or all-purpose radio system products in industry [1], [2]. In order to promote research and development in a field of SDR this paper briefly introduces some prospective as...

Passive intermodulation (PIM) measurements of antennas and the design of dual-polarised microstrip antenna elements are investigated in this thesis. The emphasis is on the development of a passive intermodulation source localisation method and on the studies of the PIM source behaviour under various impedance loading conditions. Passive intermodulation distortion can be harmful in wireless comm...

In this paper, a miniaturized coplanar waveguide fed (CPW-fed) tapered slot antenna (TSA) is introduced for breast cancer detection. Here, a modified CPW to slot-line transition structure with an air-bridge is employed to broaden the transition bandwidth and increase the radiation efficiency. Through these applied modifications, negative features of the original TSA (limitation of transition) a...

Despite its long history, the Theory of Characteristic Modes has only been utilized in antenna design for perfect electric conductors. This is due to computational problems associated with dielectrics and magnetic materials. In particular, the symmetric form of the PMCHWT surface formulation for the Method of Moments (MoM) solves for both external (real) and internal (non-real) resonances of a ...

We use a recently developed expression for the bivariate Rayleigh cumulative distribution function (CDF) to derive a novel analytical formula for the average signal-to-noise ratio (SNR) of the correlated dual selection combining (SC) system under slow Rayleigh fading. We relate the average SNR diversity gain to spatial correlation as well as to antenna separation. Furthermore, we also develop a...

A compact millimeter-wave (MMW) wideband high-gain antenna is proposed and implemented. The development is based on the design principle of wideband Fabry-Perot resonator antennas (FPRAs). The antenna consists of triple-layer dielectric slabs and a PEC ground, and it is fed by a rectangular waveguide. All slabs are used to form the superstrate that exhibits the increasing reflection phase at th...

[1] Cross-beam wind is usually estimated using a full correlation analysis (FCA) method applied to signals from spaced antennas. In this paper we present a cross-correlation ratio (CCR) method for wind measurements. The CCR method is illustrated using theory, and data obtained with the National Center for Atmospheric Research’s multiple antenna profiling radar. The standard errors of estimated ...