When the size and volume of the mobile phone decreases,the allowablespace for antenna design becoming *** this letter,a quad-band planar inverted F-antenna (PIFA) with meandered for mobile application is *** the surfa...
详细信息
When the size and volume of the mobile phone decreases,the allowablespace for antenna design becoming *** this letter,a quad-band planar inverted F-antenna (PIFA) with meandered for mobile application is *** the surface current path is meandered and folded,it has a low profile and a simple structure that makes it easy to *** PIFA antenna produces the first resonant frequency at 0.9GHz band;an additional resonance near 2 GHz band was generated by adding an open *** impedance matching characteristic was also *** proposed PIFA antenna can cover GSM (880-960 MHz)、 DCS (1710-1880 MHz)、 PCS (1850-1990 MHz)、 UMTS(1920-2170 MHz).A stable radiation pattern and maximum antenna gain is estimated to be 2.33 dBi for both 900/2000 bands operating bandwidth.
Due to the limitations of CCD and CMOS sensors certain exposure settings limit the fidelity with which these technologies can capture a real *** multiple images would be taken at various exposure settings to enable th...
详细信息
Due to the limitations of CCD and CMOS sensors certain exposure settings limit the fidelity with which these technologies can capture a real *** multiple images would be taken at various exposure settings to enable the reconstruction of images that would be more comparable to the human visual *** transform is one of the beyond wavelet transforms;it is almost optimal approximation and can represent directions *** Band limited Shearlet Transform (DBLST) performs the discretization of the Shearlet Transform directly in the frequency domain and is a powerful tool for image *** this paper,a method of multi exposure image fusion based on DBLST is proposed;the simulation results suggest the proposed method can fuse multi exposure images better than wavelet.
This paper presents a compact circular filter with mixed electric and magnetic *** proposed bandpass filter (BPF) contains only two resonators,which has two separate coupling paths:electric coupling path and magnetic ...
详细信息
This paper presents a compact circular filter with mixed electric and magnetic *** proposed bandpass filter (BPF) contains only two resonators,which has two separate coupling paths:electric coupling path and magnetic coupling *** electric coupling is realized by coupled double step impedance resonators (CDSIRs),while the grounded via-hole offers the magnetic coupling.A transmission zero close to the passband is introduced due to the mixed coupling between two *** location of this zero point can be adjusted freely by changing the strength of electric coupling or magnetic *** filter occupies only 0.1λg×0.1λg,where the λg is the guide wavelength at the center frequency of the *** results have been derived by Ansoft HFSS to verify the validity of the method.
暂无评论