Compact microstrip antenna

Abstract

Microstrip antennas usually require a ground plane that is much larger than the radiating patch. To make a microstrip antenna compact, it is essential to reduce the size of the ground plane. In this paper, it is shown that the ground plane becomes substantially smaller than that of a conventional microstrip antenna with similar radiation characteristics after folding the radiating patch over the ground plate, resulting in a compact folded microstrip antenna. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 74–76, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21265

Thermal Diffusion Process Estimation for Fabrication of Graded Plastic Optical Fibre

“…The fibre that we choose to apply our method is a two-step fibre investigated earlier in Refs. [7,9]. Fibre has the core radius of a = 50 µm and cladding radius b = 100 µm.…”

“…[5,6] However, the multistepcore fibres produced by this method typically have much lower bandwidth than the GI optical fibres. Lee et al [7] have ironed out these sharp step changes of the refraction index between individual layers of the multistep-core fibre by promoting thermal diffusion of dopants between them. Thus, a gradual (rather than step-wise) rise of the refractive index of the core is achieved towards the fibre axis.…”

“…In this study, a contribution to Lee's method [7] is made by determining the index profile that results from the thermal dopant diffusion between layers of the multi-step core fibre. Importantly, the diffusion coefficient D of the diffusion equation is not assumed to be a fixed parameter across the core.…”

L-strip proximity fed shorted rectangular microstrip antenna for mobile communication

“…There are several techniques available for reducing the size of the patch antenna, such as the use of shorting pin [6][7][8][9][10][11][12], shorting wall [13,14], aperture coupled [15][16][17], and chip resistor of low resistance [17,18]. These approaches are adopted to reduce the size of the patch conductor known as the quarter-wave patch.…”