scholarly journals Defining Effective Gain for Evaluation of Orbital Angular Momentum Links

2021 ◽  
Vol 6 (2) ◽  
pp. 117-127
Author(s):  
Elaheh Shamoushaki ◽  
Hadi Aliakbarian
Keyword(s):  
Angular Momentum ◽  
Radio Frequency ◽  
Radiation Pattern ◽  
Orbital Angular Momentum ◽  
Phased Array ◽  
Communication Link ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
Link Budget ◽  
First Time

In this paper, a communication link based on circular phased array antennas generating orbital angular momentum (OAM) beams at radio frequency is investigated. The presence of a null in the radiation pattern of OAM antennas is the main drawback of them. This problem makes it difficult to establish a telecommunication link using OAM systems and calculate the link budget for such a system. To solve this problem, we have defined two new gain parameters by using Friis Transmission Equation. The new formulas can help to calculate the effective gain of OAM antennas. Also, we have defined the effective OAM gain in detail for the first time in order to evaluate the performance of the OAM links. By using the proposed formulas, a capable and secure link based on the orthogonality of OAM beams can be designed.

Remote Reconstruction of the Radiation Pattern of Phased Array Antennas

2021 ◽  
Vol 66 (4) ◽  
pp. 427-432
Author(s):  
V. I. Gusevskii ◽  
M. D. Duplenkova ◽  
O. N. Tsvetkova
Keyword(s):  
Radiation Pattern ◽  
Phased Array ◽  
Phased Array Antennas ◽  
Array Antennas

scholarly journals Opto-VLSI-Based Beamformer for Radio-Frequency Phased-Array Antennas

2012 ◽  
Vol 4 (3) ◽  
pp. 912-919 ◽  
Author(s):  
F. Xiao ◽  
B. Juswardy ◽  
K. Alameh ◽  
S. Xiao ◽  
W. Hu
Keyword(s):  
Radio Frequency ◽  
Phased Array ◽  
Phased Array Antennas ◽  
Array Antennas

scholarly journals Phase Pattern Calibration for Interferometric Applications in Spaceborne SAR Systems

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Markus Bachmann ◽  
Marco Schwerdt ◽  
Gabriel Castellanos Alfonzo ◽  
Dirk Schrank
Keyword(s):  
Phased Array ◽  
Earth Observation ◽  
Phase Pattern ◽  
Phased Array Antennas ◽  
Array Antennas ◽  
The Difference ◽  
Interferometric Sar ◽  
The Mathematical Model ◽  
First Time ◽  
Residual Errors

SAR is a widely used technique to acquire images for geoscience and earth observation applications. Active phased array antennas are commonly used in spaceborne SAR systems. For certain modes and applications, it is necessary to know the phase behavior of these phased array antennas. For applications utilizing the different polarization channels for interferometry, the phase difference between the polarizations needs to be calibrated very accurately as it is the main evaluation parameter. Also for single-pass interferometric missions, the difference between the two antennas in terms of phase gradients is of major importance. This paper demonstrates for the first time the usage of phase patterns in an operational interferometric SAR mission. It describes why these phase patterns are required and how they are used to fulfill the different goals of the missions. Then, the mathematical model to derive the phase of the antenna patterns is shown. Finally, the paper explains how the antenna patterns are calibrated in order to minimize their residual errors and describes in detail the measurements performed for this calibration and verification.

scholarly journals Implementation of Beam Steering using Phased Array Antennas

2020 ◽  
Vol 5 (6) ◽  
pp. 1006-1008
Author(s):  
Jestin John Mathew ◽  
Nitish HS ◽  
Dr. Jayavrinda V V ◽  
Dr. Raghunandan S
Keyword(s):  
Radiation Pattern ◽  
Microstrip Antenna ◽  
Phased Array ◽  
Beam Steering ◽  
Main Lobe ◽  
Radio Waves ◽  
Phased Array Antenna ◽  
Phased Array Antennas ◽  
Radar Systems ◽  
Array Antennas

Beam steering is a phenomenon of varying the direction of the main lobe in the radiation pattern, so in radar systems it can be achieved by changing the relative phases of the antenna being implemented.But,some of the setbacks of implementing beam steering in mechanical antennas like microstrip antenna is that the directivity and, gain is low,and interference is very high.Whereas,in our project we have implemented beam steering using phased array antennas which has produced better results.So,an phased array antenna is electronically scanned antenna ,which produces a beam of radio waves that can be steered to different points based on our requirements by keeping the antenna stationary.Also,these type of antennas require less maintenance as compared to mechanical antennas

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