Conference Paper

Independent control of the beamwidth and sidelobe level of taylor one-parameter arrays

Authors:
  • Beirut Research & Innovation Center and American University of Beirut
To read the full-text of this research, you can request a copy directly from the authors.

No full-text available

Request Full-text Paper PDF

To read the full-text of this research,
you can request a copy directly from the authors.

... Dolph-Chebyshev and the Taylor one-parameter [5], [6] permit to control the sidelobe levels without allowing for the independent control of the beamwidth. To overcome this, a simple antenna array synthesis method was presented in [7] by which the SLR and the FNBW of linear arrays can be adjusted with relative independence. This method, which can be thought of as a modification to Taylor One-parameter method, was later extended to rectangular and circular arrays in [8]. ...
... As a continuation of the work done by the authors mainly in [4], in this paper, the slots of a SWA are considered as the elements of a linear array, to which the modified Taylor method of [7], is applied. The goal is to design a SWA with a FNBW and a SLR that can be independently controlled. ...
... The goal is to design a SWA with a FNBW and a SLR that can be independently controlled. Taking as inputs the number of slots in the SWA, the operation frequency, and the desired SLR and FNBW, the method in [7] computes the slots excitations required for the wanted SLR and the FNBW. The slots displacements are then deduced from these excitations by employing the authors' method in [4]. ...
Conference Paper
Full-text available
Slotted waveguide antennas (SWAs) are widely used in high power microwave applications. In this paper, the slots displacements in broadwall SWAs, previously used to control the SWA sidelobe level ratio (SLR), are further investigated to also adjust the beamwidth of the SWA. A modified Taylor array design method is used to estimate the excitations of the SWA slots leading to independently controllable SLR and first-null beamwidth (FNBW). The slots displacements are then calculated from these excitations. An example is presented where the SWA has 7 slots and the proposed method is employed to find the displacements required for desired SLR and FNBW
... A low dynamic range ratio can be obtained by using the windows with slowly decaying sidelobes. Common classes of such windows are Taylor-Kaiser [7], Taylor n bar, Villeneuve, Gaussian [8], Legendre, ultraspherical [5], and second-kind Chebyshev [10]. On the other hand, low sidelobe power can be obtained by the windows with fast decaying sidelobes. ...
... The FNBW of a K-element Taylor one-parameter array has been derived in [6] as ...
... In the synthesis of Chebyshev and Taylor ULAs, it is possible to control the sidelobe level but not the beamwidth. More recently, a method for the design of ULAs with independently controllable beamwidth and SLL has been proposed in [26]. To provide additional variables, planar arrays, shown in Fig. 4 (c), are adopted to control the radiation of the antenna. ...
Article
Full-text available
A novel approach to linear array antennas with adaptive inter-element spacing is presented for the first time. The main idea is based upon electronically displacing the phase center location of the antenna elements, which determine their relative coordinates in the array configuration. This is realized by employing dual-mode microstrip patch antennas as a constitutive element, whose phase center location can be displaced from its physical center by simultaneously exciting two modes. The direction and the amount of displacement is controlled by the amplitude and phase of the modes at the element level. This in turn facilitates reconfiguring the inter-element spacing at the array level. For instance, a uniformly-spaced array could be electronically transformed into a non-uniform one without any mechanical means. The proposed idea is demonstrated in two- and three-element linear antenna arrays. The technique has the potential to control the radiation characteristics such as sidelobe levels, position of the nulls, and the beamwidths in small arrays, which are useful for adaptively controlling the array performance in emerging wireless communication systems and radars.
Conference Paper
Full-text available
In antenna array design, linear arrays forming pencil beams are usually considered. For their design, various optimization and analytical methods have been developed. Despite many efficient optimization techniques, the analytical methods are preferable since they ensure fast and robust design. The simplest analytical method is based on polynomial approximation. In this paper, we propose a class of symmetrical linear arrays that approximate the pencil beam by using the Pascal polynomials. The proposed arrays bring very low far-out sidelobes even for a small number of elements. On the other hand, such sidelobes increase dynamic range ratio with an increase in the array size. However, for a small number of elements, the ratio is reasonably low. Furthermore, the proposed arrays exhibit higher beam efficiency than do many known low-sidelobe arrays. Such behavior is paid by somewhat wider beamwidth and slightly lower directivity.
Article
Full-text available
In this article, a new method of pattern synthesis of centre fed, equal distance linear array having single and multiple synthesis objectives has been proposed and statistically investigated. Single objective of reduced side lobe level (SLL) and first null beamwidth (FNBW) has been considered separately. Consequently, multiple objectives of beamwidth and side lobe level have been investigated. Synthesis of linear array for suitable objectives has been investigated on Taylor one parameter distribution with equal progressive phase. Excitation amplitude of each array element is taken as optimization parameter where distribution has been optimized using Particle Swarm Optimization (PSO) for achieving low SLL. Later the same has been incorporated for obtaining suitable FNBW. In our optimization algorithm conventional PSO has been modified with a restricted search PSO (RSPSO) where search space has been predefined within excitation amplitude range. PSO within the defined range searches for optimum excitation amplitude to achieve the desired objectives. In order to illustrate the effectiveness of the proposed RSPSO, simulation results of three significant instances of linear array have been presented for both even and odd number of element. The design results obtained using RSPSO have improved result than those obtained using other state of the art evolutionary algorithms like differential evolution (DE), invasive weeds optimization (IWO) and Conventional particle Swarm optimization (CPSO) in a statistically significant way.
Conference Paper
In the recent years, many heuristic optimization algorithms derived from the behavior of biological or physical systems in nature have been developed. In this paper, we propose a new optimization algorithm based on competitive behavior of group animals. The competition gradually results in an increase in population of wealthy group which gives a fast convergence to the optimization algorithm. In the following, after a detailed explanation of the algorithm and pseudo code, we compare it with particle swarm optimizations as a famous heuristic algorithm. The proposed method is used to determine an optimal set of amplitude weights of antennas and element spacing that satisfy the optimal goal during constant first null beamwidth (FNBW) for aperiodic linear array. It is to be noted that the desired prescribed nulls depth and side lobes level is achieved simultaneously with the narrowest possible FNBW. The proposed algorithm on known array antenna synthesis, shows faster and superior results compared to other optimization algorithms.
Article
In this paper, we introduce a new class of planar arrays that we call the Bessel planar arrays. A formula for the current distribution in the elements of these arrays is presented, which is related to Bessel functions. For the Bessel planar arrays, the maximal sidelobe level is controllable, the directivity is very high, and the half-power beam width is slightly larger compared to the optimal Chebyshev planar arrays. Methods to set the maximal sidelobe level and compute the directivity and the half-power beam width are described, and numerical examples are given to illustrate the features of the proposed arrays.
Article
A new method for the synthesis of low sidelobe beampatterns is presented, which enables beamwidth and sidelobe level to be adjusted with relative independence. Unlike existing methods for the synthesis of arbitrary beampatterns, the proposed method is based on a modification of the Dolph-Chebyshev design and requires only a few parameters to be optimized, regardless of the array size. Due to its much lower complexity, the method is implementable in wireless communications applications requiring fast and cheap, adaptive algorithms for low sidelobe arrays. The method is applicable, for instance, to the design of adaptive sector-like antennas with uniform circular arrays (UCAs), and to the design of quasi-steering-invariant beampatterns with uniform linear arrays (ULAs).
One parameter family of line-sources producing modified Sin
  • T T Taylor