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A new compact size linearly tapered slot antenna for ultra-wideband (UWB) imaging system is proposed. Compared with the traditional tapered slot antenna which is symmetric on both sides, half of the conventional linearly tapered slot is etched on the radiator to reduce the physical size of the structure. Corrugations are applied on the radiator for further improving the antenna performance. Both simulated...
A miniaturized elliptically tapered slot antenna fed by a novel balun is proposed for directional ultrawideband (UWB) applications. The feeding configuration consists of a stepped microstrip line and a folded slotline connected with a circular slot. An arc-shaped parasitic strip is printed inside the circular slot. This design achieves the minimization of the physical size and the capability of signal...
A novel framework for real-time image patch matching is proposed in this paper. It is composed of two parts: (a) a one-way descriptor based on Discrete Cosine Transform (DCT), (b) an optimal affine parameter quantization for descriptor dimensionality reduction. With these improvements, the patch matching is much faster than the state-of-art method and the training stage is fast enough to be performed...
In this paper, coplanar waveguide (CPW) method is proposed for identifying the surface wave band-gap of mushroom-like EBG structure. Two lines are cut off from the complete ground plane of the EBG structure and the defected ground plane can be viewed as a coplanar waveguide with characteristic impedance of 50 Ohm. The other layer of the EBG structure is not changed. The surface wave band-gap range...
This paper proposed a new 2-dimension-code-like feature based on the Haar-like feature proposed by Viola et al. The feature can be calculated in different scales rapidly once the integral image is calculated and this characteristic is inherited from the Haar-like feature. Instead of reducing the dimensions after calculating redundant features, we calculate feature vectors with fixed dimensions for...
Characteristic of ground-wave propagation and approximate calculation technique of electric field intensity over the inhomogeneous surface is investigated. The attenuation factor of ground-wave propagating along two kinds of mixed path is calculated, the consequences is also compared and analyzed. Finally, guidance is given for the appropriate selection of geology in the area where transmitting and...
A simple ground plane structure that can reduce mutual coupling between closely-packed antenna elements is proposed. The structure consists of a dumb-bell-like pattern etched in a single ground plane. It is found that isolation of more than -40 dB can be achieved between two parallel individual planar inverted F antennas (PIFAs) sharing a common ground plane. Comparison of the proposed dumb-bell-like...
A simple and compact planar inverted-F antenna (PIFA) with size of 35 mm ?? 25 mm ?? 6 mm for personal communication handset applications is proposed in this paper. The radiating patch is folded at end and etched with two slits to create multiple resonant frequency bands. The antenna covers following frequency bands: Global System for Mobile communication (GSM900, 880-960 MHz)/Digital Communication...
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