Research on Optimization of the Phase Shifter Control Current in Antenna Arrays with Electronic Beamforming and Estimation of Directivity Decreasing

2020 ◽  
Author(s):  
Sergey Shabunin ◽  
Danil Trifonov ◽  
Juraj Bartolic
Keyword(s):  
Antenna Arrays ◽  
Phase Shifter ◽  
Control Current

scholarly journals Hybrid Beamforming for Large Antenna Arrays With Phase Shifter Selection

2016 ◽  
Vol 15 (11) ◽  
pp. 7258-7271 ◽  
Author(s):  
Sohail Payami ◽  
Mir Ghoraishi ◽  
Mehrdad Dianati
Keyword(s):  
Antenna Arrays ◽  
Phase Shifter ◽  
Hybrid Beamforming

Fully Printed Static Gain Reconfigurable Conformal Patch Antenna Arrays

2017 ◽  
Vol 2017 (1) ◽  
pp. 000604-000607
Author(s):  
Nolan Grant ◽  
Mahdi Haghzadeh ◽  
Alkim Akyurtlu
Keyword(s):  
Radiation Pattern ◽  
Antenna Arrays ◽  
Patch Antenna ◽  
Phase Shifter ◽  
Mechanical Design ◽  
Low Cost ◽  
Beam Steering ◽  
Flexible Substrate ◽  
New Left ◽  
Phase Compensation

Abstract This work presents design and fabrication processes for creating statically gain-reconfigurable conformal patch array antennas. In our previous work, a fully printable and conformal antenna array on a flexible substrate with a new Left-Handed Transmission Line (LHTL) phase shifter based on a Barium Strontium Titanate (BST)/polymer composite was computationally studied for radiation pattern correction and beam steering applications. In this work, additive manufacturing techniques were used to experimentally demonstrate the phase compensation needed to improve the degraded performance of the conformal arrays. An Aerosol Jet direct-write printer was used to print several patch antenna arrays and was tested in an anechoic chamber to establish baseline gain metrics. Once a baseline is established, a high dielectric constant material (BST nano-ink) was dispensed onto the IDCs in several configurations, to provide the necessary phase compensation. The antennas were retested and the changes in their gain profiles were investigated. The findings of this work and the proposed method allow for gain compensation of curved conformal antennas and post-production modification of the radiation pattern of antenna arrays. This work has potential applications in the automotive industry due to the low cost of production and the ability to be integrated onto curved conformal surfaces without interfering with super structure or other mechanical design related criteria.

scholarly journals Vivaldi Antenna Arrays Feed by Frequency-Independent Phase Shifter for High Directivity and Gain Used in Microwave Sensing and Communication Applications

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6091
Author(s):  
Jiwan Ghimire ◽  
Feyisa Debo Diba ◽  
Ji-Hoon Kim ◽  
Dong-You Choi
Keyword(s):  
Antenna Arrays ◽  
Phase Shifter ◽  
Antenna System ◽  
Phase Shifters ◽  
Ultra Wideband ◽  
Feed System ◽  
Power Splitter ◽  
Frequency Independent ◽  
Vivaldi Antenna ◽  
The Right

This paper describes a novel feed system for compact, wideband, high gain six-slot Vivaldi antenna arrays on a single substrate layer using a unique combination of power splitters based on binary T-junction power splitter topology, frequency-independent phase shifter, and a T-branch. The proposed antenna system consists of six Vivaldi antennas, three on the left, and three on the right arm. Each arm connects with T-junction power divider splitter topology, given that the right arm is linked through a frequency-independent phase shifter. Phase shifters ensure that the beam is symmetrical without splitting in a radiating plane so that highly directive radiation patterns occur. The optimal return losses (S-parameters) are well enriched by reforming Vivaldi’s feeding arms and optimizing Vivaldi slots and feeds. A novel feature of our design is that the antenna exhibits the arrangements of a T-junction power splitter with an out-of-phase feeding mechanism in one of the arms, followed by a T-branching feeding to even arrays of proper Vivaldi antenna arrangement contributing high realized gain and front-to-back ratio up to 14.12 dBi and 23.23 dB respectively applicable for not only ultra-wideband (UWB) application, also for sensing and position detecting. The high directivity over the entire UWB frequency band in both higher and lower frequency ranges ensures that the antenna can be used in microwave through-wall imaging along with resolution imaging for ground penetration radar (GPR) applications. The fabricated antenna parameters are in close agreement with the simulated and measured results and are deployed for the detection of targets inside the voids of the concrete brick.

scholarly journals Verification of Phase Shifter Measurements of a Reflective Array Antenna

2021 ◽  
Vol 24 (2) ◽  
pp. 18-26
Author(s):  
M. D. Parnes
Keyword(s):  
Measurement Error ◽  
Radiation Pattern ◽  
Antenna Arrays ◽  
Measurement Errors ◽  
Phase Shifter ◽  
Error Function ◽  
Phase Error ◽  
Optical Excitation ◽  
Phase Shifters ◽  
Reference Plane

Introduction.  Large-size phased antenna arrays (PAA) frequently incorporate optical excitation schemes, whose main elements include the feed and the reflective aperture. In turn, the reflective aperture consists of several tens of thousands of radiators and phase shifters. Major distortions of the radiation pattern in reflective arrays occur due to phase errors, leading to a decrease in the gain and an increase in the side lobes of the radiation pattern. In the millimeter wavelength range, ferrite phase shifters can have an initial phase from 0 to 360 °, thus requiring measurements of the array elements following their assembly.Aim.  To develop a method for evaluating errors in measurements of the parameters of phase shifters incorporated in an antenna array by comparing theoretical and experimental data.Materials and methods.  A convenient method for determining the parameters of phase shifters is probing, in which a movable probe is connected in series with each array element. In cases where a PAA element represents a single structure consisting of a ferrite segment and a dielectric radiator, measurements are carried out using a probe in the form of a segment of a round waveguide moving towards the radiator. In order to evaluate the measurement error of such a scheme, a mechanically controlled reference phase shifter was used.Results. Measurement errors for the probe structure used were calculated based on the assumption of the phase error arising from the vector addition of the controlled and uncontrolled reflected signals at the input of the PAA element, in the section of the reference plane at the input of the probe. In addition, the S-parameters of the superposition section were calculated. The extrema of the error function were used to determine the maximum errors in measuring the phase and amplitude.Conclusion. The performed analysis confirmed the validity of the proposed method for measuring the parameters of phase shifters using a waveguide probe. The measurement error of the PAA elements according to the proposed scheme was found to be about 3 o, which is commensurate with that of recording devices.

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