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The planar inverted-F antenna (PIFA) is widely used in mobile and portable radio systems due to its excellent features. However, it is not yet employed as an ultra wide band antenna because it was considered a narrowband antenna. This paper introduces an ultra wideband planar inverted-F antenna based on three techniques, which are (a) changes in the widths of feed and shorting plates, (b) addition...
This paper introduces a novel modification to the design of mechanical stirring paddles in reverberation chambers. The work focuses on lower modal densities with a view to increasing the overall effectiveness of the mechanical stirring operation in this range from a statistical perspective. The research indicates that by cutting tapered slots into the stirrer plate, the induced surface current can...
This study designs and fabricates a suspending antenna on silicon substrate with backside electromagnetic band-gap (EBG) structures using surface and bulk micromachining techniques. The proposed Si-based antenna with dimension 7 mm × 18 mm × 0.5 mm only and is constructed of a ground copper plane, supporting copper vias, a suspending F-shape copper conducting layer and backside silicon cavities (to...
The ultra wide band (UWB) systems require antennas having a very broad impedance bandwidth. The planar inverted-F antenna (PIFA) is widely used in mobile and portable devices due to its excellent performance. But it is not used as an ultra wide band antenna as it is assumed to be a narrow band antenna. This paper is aimed at addressing this problem by introducing a PIFA antenna having a parasitic...
This paper represents a simulated and experimental study of the planar inverted-F antenna (PIFA). It involves the changes in different parameters to observe their effects on the antenna characteristics such as the resonant frequency, impedance bandwidth and radiation pattern. It is found that the characteristics are affected by a number of parameters which include dimensions of ground plane, length,...
Recently, Wheeler cap method was extended to measure wideband antennas. This paper presents an investigation on the effects of the loss of wheeler cap on antenna efficiency measurement results. Two caps/cavities (one large and one small) are employed for this study and numerical simulation is also conducted to aid the analysis. Both the experimental and numerical results show the loss due to the imperfection...
This paper represents a simulated and experimental study of the planar inverted-F antenna (PIFA) involving the changes in the widths of shorting and feeding plates and feeding position under the radiating top plate to observe their effects on the characteristics of PIFA, which includes such as the resonant frequency, impedance bandwidth and radiation pattern. It is found that feeding plate width plays...
A number of approaches can be used to design the high impedance surface (HIS) structure. The most commonly used approach is the full wave numerical simulator due to its accuracy and flexibility. So far, majority of the conventional simulation models proposed by researchers can only predict either the resonant frequency and reflection phase angle or the beginning of the band gap location of the HIS...
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