scholarly journals Generation of OAM Radio Waves Using Circular Vivaldi Antenna Array

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Changjiang Deng ◽  
Wenhua Chen ◽  
Zhijun Zhang ◽  
Yue Li ◽  
Zhenghe Feng
Keyword(s):  
Antenna Array ◽  
Radiation Pattern ◽  
Hollow Cylinder ◽  
Phase Difference ◽  
Simple Solution ◽  
Mode Number ◽  
Radio Waves ◽  
Vivaldi Antenna ◽  
Successive Phase

This paper gives a feasible and simple solution of generating OAM-carrying radio beams. Eight Vivaldi antenna elements connect sequentially and fold into a hollow cylinder. The circular Vivaldi antenna array is fed with unit amplitude but with a successive phase difference from element to element. By changing the phase difference at the steps of 0, ±45°, ±90°, ±135°, and 180°, the OAM radio beam can be generated with mode numbers 0, ±1, ±2, ±3, and 4. Simulations show that the OAM states of ±2 and ±3 are the same as the traditional states, while the OAM states of 0, ±1, and 4 differ at the boresight. This phenomenon can be explained by the radiation pattern difference between Vivaldi antenna and tripole antenna. A solution of distinguishing OAM states is also proposed. The mode number of OAM can be distinguished with only 2 receivers.

Generation of OAM Radio Waves Using Patch Antenna

2014 ◽  
Vol 926-930 ◽  
pp. 2337-2340 ◽  
Author(s):  
Chun Lei Qin ◽  
Ming Huang ◽  
Jing Jing Yang ◽  
Li Shen ◽  
Ying Hong Liang
Keyword(s):  
Phase Difference ◽  
Patch Antenna ◽  
Impedance Matching ◽  
The State ◽  
Antenna Element ◽  
Radio Waves ◽  
Dipole Antennas ◽  
Promising Candidate ◽  
Successive Phase

This paper introduces a feasible patch antenna to generate OAM-carrying radio beams. Eight identical printed dipole antennas with microstrip balun feedline are arranged in an octahedron cylindrical substrate. Every printed dipole is fed with unit amplitude but with a successive phase difference from element to element. We can change the phase difference at the steps of 0, ±45o, ±90o, and ±135o to obtain mode numbers 0, ±1, ±2, and ±3. Simulation shows that the OAM states of ±1, ±2 and-3 achieve the expected results well, while the state of +3 produce a deviation due to the radiation difference of the designed antenna element and traditional tripole antenna. Furthermore, we achieve the impedance matching of every port and increase the directivity of the antenna. Thus, the proposed antenna is a promising candidate to generate OAM in engineering.

Beam-steering in a three-element circular antenna-array

2014 ◽  
Vol 7 (1) ◽  
pp. 45-51
Author(s):  
Rachit Garg ◽  
Gaurav Mishra ◽  
Neetesh Purohit ◽  
Vishal Kesari
Keyword(s):  
Antenna Array ◽  
Radiation Pattern ◽  
Phase Difference ◽  
Beam Steering ◽  
Rectangular Array ◽  
Low Profile ◽  
Feed Network ◽  
Basic Functions ◽  
Microstrip Circuit ◽  
Circular Antenna Array

A simple and volume efficient circular antenna-array design with a low profile programmable beam rotation mechanism was presented. The proper selections of the rotation vector and the excitation coefficients of rectangular array-elements were made for rotation of the beam. The proposed rotation mechanism was capable to rotate the radiation pattern at any desired speed and to transmit in any desired direction, and the design included the ease of construction. Although simulating the radiation pattern using FEKO EM simulator, two basic functions, the power splitter and the introduction of phase difference, were included in feed network of microstrip circuit to divide the power and then individually feeding the each patch after introducing the desired phase difference.

scholarly journals A Highly Compact Antipodal Vivaldi Antenna Array for 5G Millimeter Wave Applications

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2360
Author(s):  
Amruta Sarvajeet Dixit ◽  
Sumit Kumar ◽  
Shabana Urooj ◽  
Areej Malibari
Keyword(s):  
Antenna Array ◽  
Radiation Pattern ◽  
Millimeter Wave ◽  
High Gain ◽  
Substantial Improvement ◽  
Antenna Design ◽  
Frequency Range ◽  
Antenna Size ◽  
Operating Frequency Range ◽  
Vivaldi Antenna

This paper presents a compact 1 × 4 antipodal Vivaldi antenna (AVA) array for 5G millimeter-wave applications. The designed antenna operates over 24.19 GHz–29.15 GHz and 30.28 GHz–40.47 GHz frequency ranges. The proposed antenna provides a high gain of 8 dBi to 13.2 dBi and the highest gain is obtained at 40.3 GHz. The proposed antenna operates on frequency range-2 (FR2) and covers n257, n258, n260, and n261 frequency bands of 5G communication. The corrugations and RT/Duroid 5880 substrate are used to reduce the antenna size to 24 mm × 28.8 mm × 0.254 mm, which makes the antenna highly compact. Furthermore, the corrugations play an important role in the front-to-back ratio improvement, which further enhances the gain of the antenna. The corporate feeding is optimized meticulously to obtain an enhanced bandwidth and narrow beamwidth. The radiation pattern does not vary over the desired operating frequency range. In addition, the experimental results of the fabricated antenna coincide with the simulated results. The presented antenna design shows a substantial improvement in size, gain, and bandwidth when compared to what has been reported for an AVA with nearly the same size, which makes the proposed antenna one of the best candidates for application in devices that operate in the millimeter frequency range.

scholarly journals End-Fire Vivaldi Antenna Array With Wide Fan-Beam for 5G Mobile Handsets

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 118299-118304 ◽  
Author(s):  
Won-Woo Lee ◽  
In-June Hwang ◽  
Beakcheol Jang
Keyword(s):  
Antenna Array ◽  
Vivaldi Antenna

scholarly journals AMPLITUDE-PHASE DISTRIBUTION MEASUREMENT PLANE DIMENSIONS INFLUENCE ON THE HOLOGRAPHIC METHOD ANTENNA ARRAY RADIATION PATTERN RECONSTRUCTION ERRORS

Doklady BGUIR ◽  
2020 ◽  
pp. 5-13
Author(s):  
O. A. Yurtsev ◽  
R. Ch. Shimanouski
Keyword(s):  
Antenna Array ◽  
Radiation Pattern ◽  
Phase Distribution ◽  
Near Field ◽  
Amplitude Distribution ◽  
Holographic Method ◽  
Longitudinal Zone ◽  
Measurement Plane ◽  
Measurement Surface ◽  
The Cost

The article explores the holographic method of measuring the antenna pattern. A flat antenna array is used as the antenna under test, and a planar rectangular surface is used as the surface on which the amplitudephase distribution in the near field is measured. Using the example of a flat antenna array, we consider the influence of the size of the measurement surface of the amplitude-phase distribution of the field in a plane orthogonal to the reconstruction plane of the radiation pattern. Antenna emitters are excited with a combined amplitude distribution and linear phase distribution. The field in the longitudinal zone of the lattice is determined using the Kirchhoff integral. The reconstructed radiation patterns are estimated using the amplitude-phase distribution over the entire measurement plane in comparison with the array radiation pattern in the far zone. A numerical analysis of the influence on the errors in determining the parameters of the lattice radiation pattern using the holographic method is also carried out: the number of columns of the amplitude-phase distribution on the measurement plane, the position of this plane in three coordinates relative to the plane of the aperture of the lattice. It is shown that if the spacing of the points of measurement of the amplitude-phase distribution and the pitch of the lattice are equal, to restore the radiation pattern using the holographic method, it is sufficient to use one column of the amplitude-phase distribution on the measurement plane. This greatly simplifies and reduces the cost of the measurement process and the necessary equipment. Examples of determining errors in measuring the parameters of the antenna array when shifting the plane of measurement of the amplitude-phase distribution in three coordinates are given.

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