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A novel broadband circularly polarized (CP) planar antenna based on off-centered coplanar waveguide (CPW) feeding method is proposed. To obtain circular polarization, traditional methods are mainly by employing external polarizer or by introducing perturbation segments into radiator. Different from traditional methods, off-centered CPW feeding provides 90° phase difference between the two orthogonal...
A fully differential feedback third-order continuous-time sigma-delta modulator suitable for Mega Hertz wireless communication is presented. Some design optimizations mainly regarding power consumption are demonstrated. The proposed single-bit modulator clocked at 128 MHz achieves 2 MHz signal bandwidth, 11 bits of resolution, 68 dB signal-to-noise ratio and 66 dB dynamic range. Designed in 0.18 μm...
In this paper we provide an architecture for Tactical Information Middleware for bandwidth constrained information management. We propose the ideas of rank-based data dissemination, and the use of a tactical information management query language. These ideas will deal with dynamic changes in bandwidth and explore opportunistic data dissemination. Thus, will lead to a cross layer design of a system...
In this paper, a new technique has been proposed to enhance the impedance bandwidth of the COCO (Coaxial Collinear) antenna. The technique is rotating the coaxial-cable subsections of the antenna. The HFSS is adopted to prove its validity, and the simulated results indicate that the proposed method can widen the bandwidth from 4.2% to 13.5%.
In this environment each mobile peer has a local database that stores and manages a collection of reports (where each report is a product record, or a coupon), and all the local databases maintained by the mobile peers form a mobile e-commerce (or, more generally, a mobile P2P) database. Queries on this database are posed by potential customers, and they search for coupons and products pertaining...
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