scholarly journals Joint Gain/Phase and Mutual Coupling Array Calibration Technique with Single Calibrating Source

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Wei Chen ◽  
Joni Polili Lie ◽  
Boon Poh Ng ◽  
Tao Wang ◽  
Meng Hwa Er
Keyword(s):  
High Frequency ◽  
Mutual Coupling ◽  
Simultaneous Equations ◽  
Coupling Coefficients ◽  
Joint Gain ◽  
Calibration Technique ◽  
Array Calibration ◽  
Simulation Results ◽  
Radio Band ◽  
Array Gain

An iterative-based method for joint gain/phase and mutual coupling array calibration is proposed in this paper. It estimates the array gain/phase and mutual coupling coefficients with a set of simultaneous equations formed by using the beam pattern property of the array. Only one calibrating source with known direction is requiblue to obtain the unique estimate. The effectiveness of this approach is illustrated by simulation results and by experimental data collected with an antenna array operating in high-frequency radio band.

scholarly journals Array calibration for mutual coupling errors of high-frequency surface wave radar

2012 ◽  
Vol 9 (8) ◽  
pp. 731-738
Author(s):  
Long Chao ◽  
Wu Xiongbin ◽  
Liu Bin ◽  
Li Lun ◽  
Xu Xing'an
Keyword(s):  
Surface Wave ◽  
High Frequency ◽  
Mutual Coupling ◽  
Wave Radar ◽  
Array Calibration

In-situ probes for patch antenna array calibration

2011 ◽  
Vol 3 (3) ◽  
pp. 273-280
Author(s):  
Alexander Stark ◽  
Benjamin Rohrdantz ◽  
Ulf Johannsen ◽  
Arne F. Jacob
Keyword(s):  
Antenna Arrays ◽  
Mutual Coupling ◽  
Patch Antennas ◽  
Active Antenna ◽  
Online Calibration ◽  
Linearly Polarized ◽  
Array Calibration ◽  
Calibration Accuracy ◽  
Simulation Results

A novel calibration network for patch antennas is proposed. We introduce magnetically coupled in-situ probes, which excite the fundamental patch mode. In that way, finite array effects and mutual coupling are taken into account, providing the opportunity for accurate online calibration of active antenna terminals. The specific advantages of the approach are demonstrated for linearly polarized patch antennas. Realization aspects of the multilayer antenna are discussed and the effect of some fabrication imperfections are investigated. Measured S-parameters as well as radiation simulation results of a single patch with the integrated probes are presented. Based on simulation of antenna arrays with in-situ probes the calibration accuracy is given in theory.

scholarly journals Direction Finding with Gain/Phase Errors and Mutual Coupling Errors in the Presence of Auxiliary Sensors

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Weijian Si ◽  
Di Wu ◽  
Lutao Liu ◽  
Xinggen Qu
Keyword(s):  
Efficient Method ◽  
Mutual Coupling ◽  
Doa Estimation ◽  
Direction Finding ◽  
Coupling Coefficients ◽  
Decoupling Method ◽  
Estimation Algorithms ◽  
Phase Errors ◽  
Simulation Results ◽  
Array Errors

Many classical direction of arrival (DOA) estimation algorithms suffer from sensitivity to array errors. A simple but efficient method is presented for direction finding in the presence of gain and phase errors as well as mutual coupling errors. By applying a group of auxiliary sensors, DOAs and gain and phase coefficients can be simultaneously estimated, and mutual coupling coefficients can also be estimated by utilizing a novel decoupling method. The proposed algorithm does not require iterative operation or any calibration sources or spectral peak searching. Simulation results demonstrate the effectiveness of the proposed method.

scholarly journals Enhancement of Bandwidth using Inset-Fed Patch Antenna for High Frequency Applications

2019 ◽  
Vol 9 (1) ◽  
pp. 1528-1531
Keyword(s):  
Patch Antenna ◽  
High Frequency ◽  
Low Cost ◽  
High Frequencies ◽  
Simulation Results ◽  
Ku Band

Today in communication field, many antennas have been evolved for various applications. The most popularly used antennas are micro-strip antennas. These antennas can be easily fabricated at reasonably low cost. Hence, these antennas are gaining lot of importance in recent times. Many techniques have been in use for micro strip antennas to improve the performance of the antenna parameters. The design of these antennas is slowly moving towards high frequencies, where there is lot of advantage with bandwidth. In this paper a normal and E shaped inset micro-strip antenna in Ku-Band is simulated and the results are presented. It is noted that CST-MS 2015 tool has been used to get the simulation results.

scholarly journals RFID Antenna for UHF Band

2019 ◽  
Vol 12 (2) ◽  
pp. 28-32
Author(s):  
Nicolae Crișan
Keyword(s):  
North America ◽  
Circular Polarization ◽  
Rfid Tags ◽  
Metallic Surfaces ◽  
Detection Range ◽  
Simulation And Optimization ◽  
Sensing Range ◽  
Simulation Results ◽  
Radio Band ◽  
Uhf Band

Abstract This paper presents a method to increase the detection range for RFID readers in the UHF radio band. The design is following especially the ISO 18000-6C standardization demands for the UHF band, operating from 865 to 868 MHz in Europe and from 902 to 928 MHz in North America. These regulations are allowing the RFID tags to operate near the metallic surfaces and in a wider range than its counterparts at lower frequencies. The paper highlights the advantages offered by the array antenna, especially by the beamforming to increase the reader surveillance zone. The paper describes some additional techniques that are allowing the usage of the circular polarization to increase the reader sensing range and to improuve detection. The design starts with simulation and optimization using HFSS and ends with the measurements that validate the simulation results.

scholarly journals Fast Optical Phased Array Calibration Technique for Random Phase Modulation LiDAR

2019 ◽  
Vol 11 (1) ◽  
pp. 1-10 ◽  
Author(s):  
Li-Jing Li ◽  
Wen Chen ◽  
Xin-Yu Zhao ◽  
Ming-Jie Sun
Keyword(s):  
Phase Modulation ◽  
Phased Array ◽  
Random Phase ◽  
Calibration Technique ◽  
Array Calibration ◽  
Optical Phased Array

Second Difference Electron Energy-Loss Spectroscopy with the Gatan Imaging Filter

1999 ◽  
Vol 5 (S2) ◽  
pp. 808-809
Author(s):  
E.C. Buck
Keyword(s):  
Nuclear Waste ◽  
High Frequency ◽  
Waste Materials ◽  
White Line ◽  
Minor Elements ◽  
Gain Variation ◽  
Line Absorption ◽  
Electron Energy Loss ◽  
Frequency Features ◽  
Array Gain

The large number of minor elements present in geological specimens and nuclear waste materials, can make TEM/EDS analysis of such samples troublesome. With a parallel detector such as the Gatan PEELS 666, the second difference technique has been shown to be effective at removing the channel-to-channel gain variation [1]. As spectroscopy performed with the Gatan Imaging Filter (GIF200) averages over a 2D array, gain variations are minimal; however, the second-difference technique selectively enhances the high frequency features such as the “white line” absorption edges, particularly of rare earth elements (REE) and transuranics (TRU). The second difference method may thus still have merit with the GIF200. A script was created within the controlling software program (DigitalMicrograph ™) which permitted second difference acquisition [2]. The Spectroscopy Package was also modified with ResEdit and the required values were added to the Global Tags to enable easy application of the second difference routine.

A Wavelet Based Directional Algorithm for UHVDC Line Protection

2015 ◽  
Vol 713-715 ◽  
pp. 950-953
Author(s):  
Ya Jie Li ◽  
Jian Cheng Tan ◽  
Shu Xian Zhang
Keyword(s):  
High Frequency ◽  
High Voltage Direct Current ◽  
Protection Scheme ◽  
High Impedance ◽  
Internal Fault ◽  
Current Transmission ◽  
Dc Line ◽  
Simulation Results ◽  
High Impedance Faults ◽  
Transmission Line Protection

When fault distance is greater than a certain value, attenuation of high frequency fault signal over the line is greater than what the DC line boundary is subject to. To sensitively detect a fault and improve the reliability of UHVDC (Ultra High Voltage Direct Current) transmission line protection, a new protection scheme based on wavelet based direction element is proposed, where directional element and attenuation of high frequency energy are used to identify an internal fault. Extensive simulation results show that the proposed protection scheme is able to sensitively detect high impedance faults, identify the faulty pole.

scholarly journals AR Model-Based Direction-of-Arrival Estimation of Coherent Signals in the Presence of Unknown Mutual Coupling

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Zhi-Chao Sha ◽  
Zhang-Meng Liu ◽  
Zhi-Tao Huang ◽  
Yi-Yu Zhou
Keyword(s):  
Mutual Coupling ◽  
Direction Of Arrival ◽  
Doa Estimation ◽  
Ar Model ◽  
Estimation Accuracy ◽  
Direction Of Arrival Estimation ◽  
Coherent Signals ◽  
Model Based ◽  
Mixing Matrix ◽  
Simulation Results

This paper addresses the problem of direction-of-arrival (DOA) estimation of coherent signals in the presence of unknown mutual coupling, and an autoregression (AR) model-based method is proposed. The effects of mutual coupling can be eliminated by the inherent mechanism of the proposed algorithm, so the DOAs can be accurately estimated without any calibration sources. After the mixing matrix is estimated by independent component analysis (ICA), several parameter equations are established upon the mixing matrix. Finally, all DOAs of coherent signals are estimated by solving these equations. Compared with traditional methods, the proposed method has higher angle resolution and estimation accuracy. Simulation results demonstrate the effectiveness of the algorithm.

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