Current Issue : April - June Volume : 2017 Issue Number : 2 Articles : 5 Articles
A novel circular polarized rectenna with out-of-band suppression is proposed in this paper. The circular polarization is realized by\ncorner perturbation on a rectangular radiation patch and enhanced by a diagonal slim slot etched at the center of the patch. An\nopen stub connecting to the quarter wavelength impedance transformer is used to suppress out-of-band wave through harmonics\nnotching. The results of simulations and experiments agree very well, which show that the rectenna obtained âË?â??19 dB return loss at\n2.4GHz and âË?â??15.5 dB, âË?â??18.1 dB, and âË?â??11.4 dB suppression on second, third, and fourth harmonic frequency bands, respectively.The\nreflection coefficient in overall out-of-band, up to 10GHz, is limited up to âË?â??3 dB. Integrated with a voltage doubling rectification\ncircuit, the proposed rectenna can obtain 75.5% RF-to-DC conversion efficiency....
A wideband dual-polarized planar antenna is designed and analyzed by using the theory of characteristic modes (TCM). The\neigenvalue, eigencurrent, characteristic pattern, and modal weighting coefficient are analyzed to bring physical insight to this kind\nof antenna.Theresults demonstrate that there are two modes resonant in the operating band for each polarization, which have been\ncombined to form a wider frequency band. A bandwidth of 60.2% (1.72ââ?¬â??3.2GHz) for VSWR < 1.5 with high isolation of 32 dB is\nachieved simultaneously. The size of the radiator structure is 0.33...
This paper presents a reliable microwave and microfluidic miniature sensor dedicated to\nthe measurement of glucose concentration in aqueous solution. The device; which is integrated with\nmicrotechnologies; is made of a bandstop filter implemented in a thin film microstrip technology\ncombined with a fluidic microchannel. Glucose aqueous solutions have been characterized for\nconcentration ranging from 80 g/L down to 0.3 g/L and are identified with the normalized\ninsertion loss at optimal frequency. The sensitivity of the sensor has consequently been estimated at\n7.6 Ã?â?? 10âË?â??3 dB/(g/L); together with the experimental uncertainty; the resolution of the sensor comes\nto 0.4 g/L. These results demonstrate the potentialities of such a sensor for the quantitative analysis\nof glucose in aqueous solution....
This paper presents a high gain millimeter-wave (mmW) low-temperature cofired ceramic (LTCC) microstrip antenna array with a\ncompact, simple, and low-profile structure. Incorporating minimum mean square error (MMSE) adaptive algorithms with the proposed\n64-element microstrip antenna array, the numerical investigation reveals substantial improvements in interference reduction.\nA prototype is presented with a simple design for mass production. As an experiment, HFSS was used to simulate an antenna with\na width of 1mm and a length of 1.23 mm, resonating at 38GHz. Two identicalmmWLTCC microstrip antenna arrays were built for\nmeasurement, and the center element was excited. The results demonstrated a return loss better than 15 dB and a peak gain higher\nthan 6.5 dBi at frequencies of interest, which verified the feasibility of the design concept....
Progress on the development of the multi-channel, ground\npenetrating radar imaging system is presented from hardware and software\nperspectives. A new exponentially tapered slot antenna, with an operating\nbandwidth from 100 MHz to 1.5 GHz was fabricated and tested using\nthe eight-port vector network analyzer, designed by Rhode and Schwarz\nIncorporated for this imaging project. An eight element antenna array\nmounted on two carts with automatic motor drive, was designed for optimal\ncommon midpoint (CMP) data acquisition. Data acquisition scenarios\nwere tested using the acoustic version of the NORSAR2D seismic ray tracing\nsoftware. This package enables the synthesis and analysis of\nmulti-channel, multi-offset data acquisitions comprising more than a\nhundred thousand traces. Preliminary processing is in good agreement\nwith published bistatic ground-penetrating radar images obtained in the\ntunnels of the Low-noise Underground Laboratory (LSBB) at Rustrel,\nFrance....
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