5 results about "Transmission loss" patented technology

The invention discloses a method and system for positioning terminal on high-speed railway based on MR data and the method comprises the following steps: according to the MR data, determining the switch sequences of a terminal described in the figures; using the geometric algorithm to calculate the angle of the cut-out cell relative to the cell; calculating the RRU sequence in the cell; calculating the latitudes and longitudes of the cut-in point and the cut-out point: according to the latitude and longitude data of the cell inside a network management system and the distance from the terminal to the cell, calculating the latitudes and longitudes of the cut-in point Cin and the cut-out point Count through the spherical geometry method wherein the distance from the terminal to the cell is calculated through a transmission loss model; and through the statistic of the total sampling points in the cell, obtaining the latitudes and longitudes of the remaining points with an equalization method. According to the invention,, without having to mapping with the test data, it is possible to position the a terminal through the MR data and the engineering wireless parameter information operation, which overcomes the shortcoming that in prior art, a high-speed railway user positions, testing is required. Therefore, both manual labor and resources can be saved and efficiency is increased.

The invention discloses an integrated Dewar applied to a linear pulse tube refrigerator and a method for manufacturing the integrated Dewar. The integrated Dewar comprises a regenerator section, a cold head section and a pulse tube section; the three sections are connected with one another by bolts, the regenerator section is connected with a regenerator hot-end heat exchanger, and the pulse tube section is laterally sealed by a chuck and is connected with a pulse tube section hot-end heat exchanger; a working face is pressed on a cold face of a cold head by Z-shaped supports of embedding groove structures of annular platforms on end surfaces of the regenerator section and the pulse tube section; and the regenerator section is provided with a lead pin, and a middle section is provided with a window and a bleeder valve seat. The integrated Dewar and the method have the advantages that the integrated Dewar is of a triple-section structure and can be coupled with the linear pulse tube refrigerator advantageously, and most parts of the working face directly cling to the cold head, so that cold transmission loss is reduced; the integrated Dewar is applied to the linear pulse tube refrigerator, the linear pulse tube refrigerator is coupled with a cooled device by the aid of the integrated Dewar, and accordingly the integrated Dewar has an extremely positive significance in the aspect of improving the practicality of the linear pulse tube refrigerator.

The invention discloses a novel surface acoustic wave or transverse wave exciter acoustic-microwave device chip structure. The chip structure comprises a surface acoustic wave or transverse wave exciter acoustic-microwave device chip circuit and a chip substrate; a first groove and a second groove are arranged in the chip substrate; a first piezoelectric material is filled in the first groove; a first electrode is arranged on the first piezoelectric material; one end of the first electrode is connected with the first piezoelectric material; the other end of the first electrode is connected with the signal input end of the chip circuit; a second piezoelectric material is filled in the second groove; a second electrode is arranged on the second piezoelectric material; one end of the second electrode is connected with the second piezoelectric material; and the other end of the second electrode is connected with the signal output end of the chip circuit. By means of the novel surface acoustic wave or transverse wave exciter acoustic-microwave device chip structure provided in the invention, the transmission loss and microwave insertion loss of the device can be reduced; and the performances of the device, such as the frequency and the quality factor, can be improved.

The invention discloses a device for lowering transmission loss in a feeder tube. The device has the characteristics that the device comprises an interface waveguide tube, a butt joint waveguide tube and a dust blocking net, wherein the head end of the interface waveguide tube is provided with an interface flange, the end surface of the interface flange is provided with at least one annular slot, the diameter of the annular sealing slot is greater than the diameter of a wedge-shaped annular slot, and an insulator filling material is arranged in one annular slot; the head end of the butt joint waveguide tube is provided with a butt joint flange, and the end surface of the butt joint flange is flat; and the dust blocking net is arranged between the end surface of the butt joint flange and the end surface of the interface flange, and the butt joint flange and the interface flange are fixed through a plurality of fasteners. When the device for lowering the transmission loss in the feeder tube is used, the diffraction and the leakage of electromagnetic wave on the butt joint flange interface in a waveguide tube transmission process can be effectively avoided, and transmission power is protected from losses so as to guarantee the transmission efficiency and the transmission safety of the waveguide tube.