The arranging density of the feeding antenna is the main factor which decides the spatial sampling rate of the millimeter-wave focal plane array(MFPA) imaging systems. This paper proposes a new kind of feed antenna. Comparing with the other feeding antennas, it has broader waveband, lower side lobe, lower mutual coupling, a moderate gain and constant input impedance in a very wide frequency range. It is easier to form a close feed array which can realize an effective exposure to the lens or the reflector antenna with less over flow loss. A detailed theoretical analysis, simulation and optimization of the design are done to develop the linearly tapered slot antenna(LTSA), its microstrip-slotline transition and antenna feed array. They show the good availablity of LTSA in MFPA imaging systems.
The neutron total cross-sections of thulium(169Tm) were measured in the neutron energy region from 0.01 eV to 100 eV by using the time-of-flight method at the Pohang Neutron Facility,which consists of an electron linac,a water-cooled tantalum target with a water moderator,and a 12 m time of flight path.Two thulium plates with different thicknesses were used for the neutron transmission measurement.The background level was determined by using a notch-filter of Co,In,and Cd sheets.The present measurement was compared with the previous ones,and a new set of resonance parameters of 169Tm isotope was obtained from the transmission rate by using the SAMMY code,with a comparison with the recommended parameters by Mughabghab.
Since P+-MIC Poly-Si thin film has good electricity characteristics and the optic characteristic of semi-transparent and semi-reflective,it is used as the LCD electrode which is both transparent and reflective to form a transflection LCD panel.However,the MIC poly-Si thin film′s transmission and reflection varies in the spectrum of visible light,which results in the aberrance of the white light.Therefore,we put high reflective Al of different area on the electrode to compensate and keep a balance among the three essential colors light transmitting and reflecting from the MIC p-Si electrode.The result indicates that in the spectrum of visible light,the reflection and transmission of red,green and blue light are basically accordant.With the MIC Poly-Si LCD anode technique,the LCD anode is the prolongation of its driving TFT drain,and the Al reflective mirror is prepared with the same Al electrode wire of TFT.Therefore,the high performance transflection LCD would be achieved and the preparation process flow of AMLCD panel would be simplified.Based on the MIC poly-Si transflection electrode technique and the full PMOS poly-Si peripheral driving circuit technology,a 4-MASK process flow is proposed and it is carried on the system-on-panel active matrix substrate for LCD(SOP-AMLCD).The simplification of the process flow would result in the significant reduction of manufacturing costs.
Wavelet multi-scale analysis is applied to the research on lunar gravity field and the explanation of lunar inner structure. In this paper, the nearside of the Moon with higher quality data is chosen as the test area, and free air gravity data from Clementine mission are used as original data to decompose gravity of some specific mare basins. With the results of numerical test, we also explain the hierarchical structure of the Moon, analyze the thickness of mare fillings and the Moho topography under mare basins, and verify the results by comparisons.
We put forward a recurrence spectra of helium M=1 atoms in a parallel electric and magnetic fields with a scaled energy e-G=-0.03 and constant scaled electric field at f-G=0.01 in accordance with the closed-orbit theory and spatial-splitting consistent method.The recurrence spectra of helium M=1 atoms are compared with M=0 in the same conditions.Because of the centrifugal barrier on z axis,the effects of diffraction of ionic core and the correlation of electrons are weakened.This makes the spectra considerably simple,which is completely consonant with the experiments.
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