39 results about "Mismatch loss" patented technology

Methods and systems for tracking signals with diverse polarization properties address both sensitivity and antenna tracking performance issues. In one embodiment, complex weightings for matching a polarization of an incident signal on a data channel are determined, and the complex weightings are applied to a tracking channel such that an antenna system polarization is matched to the polarization of the incident signal. In another embodiment, orthogonally polarized tracking channel components of an incident signal are processed to make a determination as to which of the orthogonally polarized tracking channel components is stronger, and this determination is used to select a polarization of a data channel to reduce a polarization mismatch loss.

This invention provides directional connectivity described by the interconnections of the blocks in the schematic or netlist that are used to propagate impedance data from one block to another. The propagation of impedance data for discrete time based simulation programs allow for the simulation under less than ideal termination conditions between the blocks. This invention also supports functionality where the input impedance and output impedance of each block are not perfectly terminated. This assumption can lead to very significant modeling errors in the simulated results. In general, termination impedances are complex frequency dependent functions that result in frequency dependent mismatch losses between the blocks. This invention allows for the propagation and calculation of impedance mismatches between the various blocks.

The invention discloses a method and a system for reducing series-parallel mismatch loss of a photovoltaic group. The series-parallel mismatch loss of the photovoltaic group is reduced at low cost. The method comprises the following steps of acquiring a working current of each photovoltaic string which is connected in parallel to the same path of MPPT (Maximum Power Point Tracking); the actual support angle and the optimal support angle of the photovoltaic string with the minimum working current being determined; the optimal support angle refering to the corresponding support angle when the solar radiation amount on the photovoltaic string reaches the maximum; judging whether the deviation between the actual bracket angle and the optimal bracket angle of the photovoltaic group string with the minimum working current exceeds a threshold value or not, and if so, on the premise that the working current of the photovoltaic group string with the minimum working current does not exceed the working current of the photovoltaic group string with the maximum working current, stopping the operation of the photovoltaic group string with the maximum working current; and adjusting the actual bracket angle of the photovoltaic string with the minimum working current to reduce the deviation between the actual bracket angle and the optimal bracket angle.

The invention provides a defect diagnosis method and device for a photovoltaic power station. The method includes the following steps: collecting test data during the operation of a photovoltaic powerstation to be diagnosed; according to the test data, determining an annual performance PR value of the photovoltaic power station to be diagnosed, a PR value of each power generation unit of the photovoltaic power station to be diagnosed, and the PR value, weighting efficiency, parallel mismatch loss or series mismatch loss of components included in each power generation unit; and diagnosing positioning defects of the photovoltaic power station to be diagnosed layer by layer based on a PR evaluation threshold model and according to the PR value of the photovoltaic power station to be diagnosed, the PR value of each power generation unit of the photovoltaic power station to be diagnosed, and the PR value, weighting efficiency, parallel mismatch loss or series mismatch loss of the components included in each power generation unit, wherein the PR evaluation threshold model is predetermined based on actual measured data of the photovoltaic power station on the scene. According to the above technical scheme, the defect detection of the photovoltaic power station from the operation level can be implemented, and the efficiency of defect diagnosis of the photovoltaic power station can beimproved.

The present invention provides an antenna structure and a communication terminal. The antenna structure includes: an antenna radiator, a signal source, a first capacitor and a first tuning circuit; the first end of the antenna radiator is grounded; the second capacitor of the first capacitor One end and the first end of the first tuning circuit are electrically connected to the connection point of the antenna radiator, the second end of the first capacitor is electrically connected to the signal source, and the first tuning circuit The second end is grounded; wherein, the antenna impedance of the first end of the first capacitor at the target frequency point is located in the first quadrant of the Smith chart, and the target frequency point is at least part of the frequency band covered by the antenna radiator Frequency. On the one hand, the present invention can make the antenna structure produce a new resonance mode, and optimize the resonance mode excited by the antenna structure; on the other hand, it can improve the impedance mismatch loss problem of the antenna, reduce the impedance mismatch loss, and then improve the transmission of the antenna. efficiency.

The invention discloses an antenna system with a built-in MIMO. The antenna system is composed of flexible board B2B regions, a flexible board, metal reinforcing boards, opening-free metal reinforcingboards, and metal reinforcing boards which right face the openings of via holes, wherein two via holes are formed in each metal reinforcing board which right faces the openings of the via holes, twosignal lines are arranged on one sides of the flexible board B2B regions and connected to an inner layer through the via holes, and opening treatment is conducted on the positions, right facing the via holes, of the metal reinforcing boards. The antenna system with the built-in MIMO can overcome the problems of mismatch and performance loss of a transmission line under a high-frequency transmission condition caused by coupling between via holes and metal reinforcing boards in an existing FPC transmission line design; and the influence of the reinforcing boards on the via holes can be reduced in a mode of forming openings at positions corresponding to the via holes, and the performance of the transmission line is improved.

The invention discloses an estimation method for parallel mismatch of subarrays of a photovoltaic power station. The estimation method comprises the following steps of: carrying out IV scanning on thesubarrays to obtain IV curves; obtaining theoretical maximum output power P1 of the subarrays according to the IV curve of each string, calculating theoretical maximum output power P2 of string typeinverter subarrays; calculating theoretical maximum output power P3 of centralized type inverter subarrays; obtaining parallel mismatch loss of the string type inverter subarrays deltas and the centralized type inverter subarrays deltac. The estimation method disclosed by the invention has the advantages that IV curves of all strings of the subarrays can be measured and calculated simultaneously,the voltage differences of maximum power points of each string are obtained by testing under same conditions at the moment, so that the mismatch of working voltages among all the strings in the subarrays can be accurately evaluated.

The invention discloses a photovoltaic system series-parallel mismatch loss ratio test device and a test method thereof. The test device comprises a first IV curve test plate used for testing a whole string or string conflux, a plurality of second IV curve test plates used for testing a corresponding channel of each path of assemblies, series connection switching switches used for serial assemblies, parallel connection switching switches for parallel connection assemblies, test switching switches used for testing IV curves, an interface conversion plate, a PC, and a control panel. The test method additionally comprises testing once a whole IV curve based on a current test method, provides a reliable loss ratio result when the maximum power deviation of twice tests is less than a certain threshold, and substitutes a formula with the power average value of twice whole strings or stings after conflux for calculation, thereby obtaining more scientific and more reasonable measuring results.

The invention provides a Global Positioning System (GPS) and 3rd-Generation (3G) single-antenna realizing device, which comprises a dual-resonant antenna used for receiving a radio frequency signal, a matching circuit which is connected with the dual-resonant antenna for obtaining the radio frequency signal and performing signal matching processing on the radio frequency signal, and a diplexer which is connected with the matching circuit for obtaining the radio frequency signal subjected to signal matching processing and sending the radio frequency signal subjected to separation processing respectively to a GPS module and a 3G diversity receiving module. The invention also provides a mobile terminal. According to the solutions disclosed in the invention, the reflection loss and mismatch loss in the transmission process of the radio frequency signal can be reduced, the transmission efficiency of the radio frequency signal can be increased, the communication quality of the mobile terminal can be enhanced, and the increasing of the space for placing the antenna can be avoided.

The invention relates to a dense-condensation photovoltaic cell array reducing mismatch loss, belongs to the technical field of solar energy utilization, and aims at reducing the mismatch loss of thedense cell array under non-uniform radiation and improving the power output of the dense cell array. The dense-condensation photovoltaic cell array of a rotational symmetry structure is divided into sub-modules in rotational symmetry, cells in each sub-module are connected in parallel, serial or full manner or a parallel, serial and full mixed manner, and the sub-modules are connected in series. Connection design with rotational symmetry characteristics enables that power loss caused by current and voltage mismatch of the dense cell array module of a large condenser can be reduced obviously under the real illumination condition with Gaussian or truncated cone-shaped distribution characteristics, power output of the cell array is further improved, and the efficiency, economical performanceand reliability of a dense-condensation photovoltaic cell array power generation system are improved.