attenuation of the dip and the loading width from the width of the FWHM of the dip, while the position of the applied weight was detected from the resonance wavelength that appeared according to grating period of the region where the weight was applied. A better position resolution is expected, if a metal bar with fewer grooves per grating period is used. Furthermore, a wider region can be measured, if longer metal bar with more period grooves is used. CONCLUSIONSAn MLPFG array sensor was investigated for measuring the amplitude and width of an applied weight as well as detecting its position. The MLPFG array sensor consisted of an SMF placed between a rubber cover and a 45-cm-long metal bar with 10 different groove grating periods on the upper surface. When the SMF under the rubber cover was pressed by weights, LPFGs were formed with resonance wavelengths corresponding to the grating periods under the applied weights. The resonance wavelength of the LPFG formed when pressing the SMF depended on the loading position of the weight, and the amplitude of the dip was inversely proportional to the amplitude of the applied weight. Moreover, the FWHM of the dip was proportional to the loading width of the weight. Experimental results showed that the MLPFG array sensor can be utilized for measuring the amplitude and loading width of an applied weight and detecting its position. An MLPFG sensor with different characteristics can be expected when using a longer metal bar with a different number of grooves per grating period and different grooves.ABSTRACT: Using a coplanar waveguide (CPW) feed with a shortcircuiting stub, the fed circular slot antenna for W-band operation is presented. The obtained results show that the impedance bandwidth, which is determined by 10 dB return-loss of the proposed slot antenna, can reach to 21% with the center frequency at 94 GHz (80 GHz-100 GHz), and the gain achieves 3.05 dBi at 92 GHz with good radiation performance.ABSTRACT: This article presents a new miniature reconfigurable digital video broadcasting-handheld (DVB-H) antenna for a portable TV or tablet PC device. The antenna consists in a Printed-Inverted-F-Antenna (PIFA) loaded by a varactor diode. The radiating element has a size of 30 Â 30 Â 5 mm 3 and is mounted on a 230 Â 130 mm 2 ground plane. This antenna is able to maintain a return loss below À10 dB on a 8-MHz bandwidth reconfigurable channel from 450 to 900 MHz. Then, this radiating element reaches to cover the whole frequency band specification of the DVB-H standard while keeping a good efficiency despite of the strong miniaturization.
A W‐band coplanar waveguide (CPW) low‐loss annular branch‐line bandpass filter for planar integrated millimeter‐wave circuits is presented. It is designed by using the annular branch‐line coupler as a transversal filtering section by loading the coupled ports of the coupler with suitable open load stubs and taking the isolated port as the output node. The proposed W‐band bandpass filter shows very good performance, insertion‐loss of 0.7 dB with a 14.9% of 3 dB relative bandwidth at center frequency of 94 GHz and return loss is better than −27 dB at the center frequency. The designed and fabricated bandpass filter exhibits the good performance for monolithic integrated millimeter‐wave circuit applications. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2400–2403, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26264
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