This paper presents the design, simulation, and measurement of two low-cost broadband circularly polarized (CP) printed antennas: a single element and an array at C band. The proposed single element antenna is excited by an L-shaped strip with a tapered end, located along the circular-slot diagonal line in the back plane. From the array experimental results, the 3 dB axial ratio bandwidth can r...

In In this paper, two low profile, single fed cavity backed slot antennas providing a circularly polarized (CP) wave are introduced. One of the antennas presents a right-handed CP (RHCP) wave, while the other one offers a left handed CP (LHCP) wave. The proposed antennas consist of a square shaped Substrtae Integrated Waveguide (SIW) cavity incorporatng two couples of radiating slots to radiate...

The paper presents the results of development and modelling a broadband antenna system for Unmanned Aerial Vehicle (UAV) direction finding. research covered issues analytical description based on prototype – Vivaldi antennas. article mathematical element model. An experimental relationship between geometrical parameters characteristics has been established. A review current state issue designin...

Two optical waveguide sensors based on SOS (silicon-on-sapphire) for detecting CO2 are theoretically proposed. The operational wavelength is 4.23 ?m, which the maximum absorption line of CO2. power confinement factor (?) value over 40% and 50%, propagation loss 0.98 dB/cm 2.99 dB/cm, respectively, in slot SWGS (subwavelength grating slot) waveguide. An inverted tapered structure used transition...

This paper gives the description of the TGB system submitted to the Aspect Based Sentiment Analysis Task of SemEval-2016 (Task 5). The system is built on linear binary classifiers for aspect category classification (Slot 1), on lexicon-based detection for opinion target expressions extraction (Slot 2), and on linear multi-class classifiers for sentiment polarity detection (Slot 3). We conducted...

This paper describes our system submitted to Aspect Based Sentiment Analysis Task 5 of SemEval-2016. Our system consists of two components: binary classifiers trained using single layer feedforward network for aspect category classification (Slot 1), and sequential labeling classifiers for opinion target extraction (Slot 2). Besides extracting a variety of lexicon features, syntactic features, ...

HICKS, CHRIS WAYNE. Experimental and Electromagnetic Modeling of WaveguideBased Spatial Power Combining Systems. (Under the direction of Michael B. Steer.) Recent technological advancements and demands for high power sources at microwave and millimeter-wave frequencies have initiated extensive theoretical and experimental research in the area of quasi-optical and spatial power combining. The wo...