Optimal Polarized Beampattern Synthesis Using a Vector Antenna Array (original) (raw)
Minimum variance beamforming using polarization sensitive array
2008 11th IEEE Singapore International Conference on Communication Systems, 2008
In this paper we study an accurate interference rejection capability of a minimum-variance polarization sensitive (MVPS) beamformer using a uniform linear array of crossed dipoles. The interference cancellation is done in the spatiopolarized domain since MVPS beamformer search in both the direction of arrival and polarization domains. Also, MVPS beamformer has the capability of handling more signals than the scalar array having the same number of sensors in a single beam. We have also analyzed that there will be no beam when the desired and interference EM signals are same in nature.
IEEE Transactions on Antennas and Propagation, 2000
the rest of the radiated fields are below the 030 dB level. The component of the total radiated field with polarization perpendicular to the desired polarization (cross-polarization) is shown in . For all the directions of and , the values remain below 030 dB. Thus the main beam is pointing in the desired direction ( d = 30 and d = 90 ) with sidelobe and cross-polarization levels below 030 dB.
The Applied Computational Electromagnetics Society Journal (ACES)
In many applications, the radiating elements of the used antenna may be configured in the form of a one-dimensional linear array, or two-dimensional planar array or even random array. In such applications, a simple optimization algorithm is highly needed to optimally determine the excitation amplitudes and phases of the array elements to maximize the system’s performance. This paper uses a convex optimization instead of other complex global stochastic optimizations to synthesize a linear, planar, and random array patterns under pre-specified constraint conditions. These constraints could be either fixed beam width with the lowest possible sidelobe levels or fixed sidelobe level with narrower possible beam width. Two approaches for array pattern optimization have been considered. The first one deals with the problem of obtaining a feasible minimum sidelobe level for a given beam width, while the second one tries to obtain a feasible minimum beam width pattern for a given sidelobe lev...
DESIGN OF DIPOLE ARRAYS FOR THE GENERATION OF MULTIPLE BEAMS
A Dipole is a basic linear bi directional antenna available in different multiple of wave lengths like multiple of λ, λ/2 and λ/4 etc, Dipoles are very popularly used in variety of applications in wireless communications systems. The works on the antennas for the generation of multiple beams are limited as reported in the literature. In view of this, in the present paper, desired numbers of multiple beams are generated from the arrays of dipole radiators and are compared with the elements isotropic arrays. Taylor’s amplitude distribution is modified and is used for this paper. The design is carried out for arrays of 20, 40 and 60 number of elements. The data on the patterns are generated and are useful in wireless communication and Radar communication.
The Effect of Electromagnetic Polarization on the Performance of Adaptive Array Antennas
The polarized signals impinging on adaptive antenna arrays have significant impact on their performance. In this paper an investigation of the effect of polarized signals (desired and interference) on the performance of uniformly spaced steered beam adaptive array antennas is conducted, and a comparison between adaptive arrays with single dipole and cross-dipole elements is presented to show the effect of polarization on both of them. It is shown that the cross-dipole array antennas have better performance than the single dipole antenna array antennas if the polarization of the desired signal is unknown, while the single dipole arrays give better performance if the polarization of the desired signal is known.
Dimensionality Reduced Antenna Array for Beamforming/steering
arXiv (Cornell University), 2022
Beamforming makes possible a focused communication method. It is extensively employed in many disciplines involving electromagnetic waves, including arrayed ultrasonic, optical, and high-speed wireless communication. Conventional beam steering often requires the addition of separate active amplitude phase control units after each radiating element. The high power consumption and complexity of large-scale phased arrays can be overcome by reducing the number of active controllers, pushing beamforming into satellite communications and deep space exploration. Here, we suggest a brand-new design for a phased array antenna with a dimension reduced cascaded angle offset (DRCAO-PAA). Furthermore, the suggested DRCAO-PAA was compressed by using the concept of singular value deposition. To pave the way for practical application the particle swarm optimization algorithm and deep neural network Transformer were adopted. Based on this theoretical framework, an experimental board was built to verify the theory. Finally, the 16/8/4-array beam steering was demonstrated by using 4/3/2 active controllers, respectively.
Radio Science, 2009
1] A method for ensuring polarization agility in conjunction with beam steering in planar array antennas is proposed. It relies on interleaving two subarrays with orthogonal, linear polarizations that, together, can generate arbitrary polarization states: adjustable linear, elliptical, and left-or right-handed circular. The complexity of the resulting system is comparable with that of standard, fully populated array antennas consisting of identical, linearly polarized elements. By dynamically controlling the amplitude and the phase of the signals fed to the subarrays, a stable polarization state can be maintained during beam steering. The concept is validated by numerically investigating an architecture obtained by interleaving nonuniform subarrays designed by means of a deterministic placement strategy. The effects of the mutual coupling between the different radiating elements are modeled and discussed.
Characterization and Optimization of a Collinear Array of Circularly Polarized Side-Mounted Elements
Indonesian Journal of Electrical Engineering and Informatics (IJEEI)
This paper presents the radiation characteristics of a two-element collinear array of shunt-fed, slanted dipoles side-mounted to a metallic tower. It presents the radiation characteristics of the array as commonly implemented by FM broadcasters and suggests methods on how to optimize these characteristics such as the power gain, pattern circularity, side-lobe reduction, and horizontal-vertical polarization component ratio for the array to better conform to broadcast standards. By determining these characteristics using an advance antenna simulation software, optimization variables are identified, and their optimized values are determined. The optimized values lead to improved radiation characteristics of the array in conforming with broadcast requirements. Results show that adjusting the distance between the dipoles to less than one wavelength reduces the sidelobe of the array radiation pattern; varying the dipole physical specifications improves the polarization component ratio and the circularity of the radiation pattern. However, varying the dipole specifications also reduces the gain of the array. For applications requiring higher gains, other methods of realizing high collinear array gains are recommended.
Optimizing Circular Polarization within a Beam of Patch Antenna Elements
2006 International Conference on Microwaves, Radar & Wireless Communications, 2006
The paper presents the results of an investigation into patch antenna elements that would be capable of providing good circular polarization not only in the broadside direction, but also over a wide range of elevation angles.