136results about How to "Improve Phase Consistency" patented technology

The invention discloses a frequency changing method of digital middle-frequency signals used in a repeater station system, which comprises two steps of an up frequency changing process and a down frequency changing process: in the down frequency changing process, the middle-frequency signals after digital analog conversion are processed by digital wave filtering processes such as an extraction process, a bandpass compensation, a signal shaping process, etc. after a digital frequency mixing process, the middle-frequency signals can be moved to a zero middle-frequency, a digital signal with the high speed rate can extracted as two-channel quadrature digital baseband I, Q signal with a low speed rate; in the up frequency changing process, the digital baseband I, Q signals acquired from the down frequency changing process are processed by an interpolation filtering process, then processed by I, Q modulation process and a secondary frequency mixing process, and the signals can be processed by a gain adjustment and control, finally high speed digital middle-frequency signals are outputted. Correspondingly, the invention also discloses a frequency changing system thereof. The invention can be achieved by using PLC units such as FPGA, CPLD, EPLD and DSP, etc., which can improve the integration degree of repeater station equipment; meanwhile, an ASIC chip is removed to decrease heating capacity and to improve the reliability.

The invention provides a compact antenna feed calibration network, and aims at providing the highly-versatile and reliable integrated feed calibration network used for antennas of a base station. According to the compact antenna feed calibration network, an upper-layer antenna metal floor (1) as a top layer is provided with a corresponding intermediate-layer antenna combiner feed network (2) and embedded grooves, combiner modules are embedded into the embedded grooves, the embedded grooves are arranged in a staggered manner at the same interval, combiners are connected antenna ports and ports corresponding to a lower-layer antenna calibration network (3) via four different model design modules, two combiners needed by dual polarization of every two unit subarrays serve as one module, and the modules are fastened and combined with the upper-layer antenna metal floor in a modularized installation way. the intermediate-layer antenna combiner feed network for connecting an antenna unit with the lower-layer antenna calibration network is formed, the lower-layer antenna calibration network is of a strip line structure, and 32 parallel coupling linear directional couplers (15) and a 1-to-32 power divider (14) are distributed in an H-shaped PCB of the lower-layer antenna calibration network.

The invention relates to an arbitrary polarized wave generation and calibration method. The generation method comprises the following steps: generating digital signals in a base band, and carrying out amplitude-phase adjustment and compensation on two paths of orthogonal digital signals; and converting the digital signals into analog signals, up-converting the analog signals into radio frequency signals, carrying out power amplification and distribution on the radio frequency signals through two transmitters, and synthesizing polarized waves in arbitrary polarization directions in an ortho-mode coupler by two signals. In the design of polarized signal calibration, the calibration method includes steps of coupling two paths of a few signals from two paths of transmission signals to enter calibration channels; comparing the consistency of signals in the two channels and searching the minimum difference of two phases of polarization signals by using an optimization algorithm; and comparing the differences of the two paths of signals, feeding the differences back to a polarized wave generation unit, and measuring and compensating the generated signals so as to ensure the consistency of the signals in the two channels.

The invention discloses a compact Wilkinson power divider, which comprises an input port, a first output port and a second output port, wherein the input port is connected with the first output port through an input line, a first transmission line and a first output line which are sequentially connected in series; the input port is connected with the second output port through the input line, a second transmission line and a second output line which are sequentially connected in series; the intersected common end of the first transmission line and the second transmission line is connected witha grounded first capacitor in parallel, the other end of the first transmission line is connected with a grounded second capacitor in parallel and the other end of the second transmission line is connected with a grounded third capacitor in parallel; and a direct isolation resistor is connected between the first transmission line and the second transmission line. The problem of relatively large area of a traditional Wilkinson power divider is solved, meanwhile, the function of equal power distribution is achieved, and the compact Wilkinson power divider is suitable for PCB-level applicationsand integrated circuit applications.

The present invention belongs to the back-cavity antenna design field and provides a low-frequency broadband high-efficiency low-profile back-cavity antenna. The objective of the invention is to solve problems in the prior art. According to the low-frequency broadband high-efficiency low-profile back-cavity antenna of the invention, a bow tie-shaped dipole and a feed Balun are arranged in a reflection cavity; the root portion of the feed Balun is connected with the bottom end surface of the reflection cavity; the top end of the feed Balun is connected with the feed end surface of the tie-shaped dipole; the other end surface of the tie-shaped dipole is connected with an H-shaped medium pull rod; the cavity connection end of the feed Balun is a connection port which is connected with the bottom end surface of the reflection cavity; the end surface of the cavity connection end of the feed Balun is parallel to the bottom surface of the reflection cavity; the dipole connection end of the feed Balun is a connection end which is infinitely closed to the feed end of the tie-shaped dipole; the end surface of the dipole connection end of the feed Balun is parallel to the bottom surface of the reflection cavity; and two ends of the H-shaped medium pull rod are respectively connected with two opposite edges of the opening end surface of the reflection cavity.

The invention provides an ultra wide band bridge based on a thick film manufacturing technology. The ultra wide band bridge comprises a thick film circuit substrate, a coaxial cable, a magnetic core and a capacitor. The ultra wide band bridge is externally provided with three mutually connected ports P1, P2 and P3, wherein the port P1 and the port P3 are two radio frequency ports connected to a resistor power distribution circuit and the port P2 is connected to the unbalanced end of a Balun. When signals are transmitted in a non-inverting mode, the port P1 serves as an input port, and after resistor power distribution, partial power is coupled to the port P3 to be output and partial power is directly output through the port P2. When the signals are transmitted in an inverting mode, the port P2 serves as the input port, the signals are converted by the Balun from being unbalanced to being balanced, two routes of signals which are equal in amplitude and opposite in phase are obtained at the balanced end, the two routes of signals are offset at the port P3 through power distribution circuits respectively, signal isolation is achieved for the port P3, and partial power is directly output through the port P1. By the adoption of the ultra wide band bridge based on the thick film manufacturing technology, the applicable frequency of the directional bridge based on the Balun and the resistor power distribution circuit can be improved to be in a millimeter wave band, a larger working bandwidth can be realized, and the ultra wide band bridge is simple in structure and convenient to integrate.

The invention provides a "V"-shaped radar radome structure and a preparation method thereof. The radome structure is obtained by co-curing of an antenna, a skin and a filling core layer, the skin andthe filling core layer are adhered by using an adhesive layer so as to form the radome, and the antenna and the filling core layer are adhered by using the adhesive layer and wrapped in the radome. The influence of multilayer reflection interference of the conventional interlayer radome surface can be weakened by the integral design of the radome and the antenna. Besides, compared with the multilayer skin core layer structure, only one skin is required, the wave permeability can be enhanced by the ultrathin skin design and the error of aiming can be greatly reduced. Meanwhile, the antenna pattern and phase consistency can be enhanced, and the problems of reduction of the wave permeability and pattern distortion under the broadband condition of the "V"-shaped radome can be solved, and the wave permeability, the pattern and the phase consistency of the "V"-shaped radome are enabled to meet the working requirements of the radar antenna.