Study and Analyzing the Circular Dish Radar Antennas Pattern (original) (raw)
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Phased Linear Array of Circular Aperture Antennas
A Ab bs st tr ra ac ct t In this paper the phased array consist of a circular aperture antennas are arranged in linear array to study the effect of the number of elements on the radiation pattern parameters. The effect of distribution of current on each elements also studied to reduced the side lobe level.
IEEE Access
The number of elements reduction in different antenna array configurations such as linear, circular, rectangular, planar, and non-planar is of main concern for several research groups. This minimizes the complexity of the feeding network in static antenna arrays, whereas, in adaptive antenna arrays, it reduces the number of active components. The main issue in the array synthesis is to preserve the radiation pattern with minimum distortion compared to the original pattern. These issues are addressed by many researchers in linear, planar, and concentric circular arrays, but no attempt is made in the synthesis of uniform circular antenna arrays (UCAAs) that have elements distributed on a single circle. This is because the synthesis is almost performed in one plane where the radiation patterns in other planes are not predicted. In this paper, most of the aforementioned challenges are treated; the number of elements is reduced, the radiation pattern has minimum distortion, and the radiation pattern is symmetric in all array orthogonal planes. This is performed by dividing the original UCAA's 3D radiation pattern into a suitable number of 2D plane patterns, each of which is separately synthesized using the specified number of elements. The 2D pattern synthesis process for a particular plane is confined to estimating a new set of non-uniform excitation coefficients while keeping the original UCAA's array radius. To construct the final set of synthesized excitation coefficients for the 3D array pattern synthesis, we aggregate all of the estimated sets of excitation coefficients and take the average. To verify the efficacy of the proposed technique, the original and synthesized arrays are realized using the CST Microwave Studio using λ 2 dipole elements. The results indicated that substantially matched patterns were obtained. Furthermore, the coupling between the synthesized array elements is decreased, which enhances the radiation efficiency and realized array gain. INDEX TERMS Antenna array beamforming (BF), side lobe level (SLL), computer simulation technology (CST), dynamic range ratio (DRR), uniform circular antenna array (UCAA).
Design of Uniform and Nonuniform Circular Arrays Comparison with FFA and RLS
Progress of Electrical and Electronic Engineering, 2018
Multiple antennas can be arranged in various geometrical configurations to form antenna array with high directive radiation pattern. Linear antennas are limited in their steering capability. The circular arrays ar more popular in recent years over other array geometries because they have the capability to perform the scan in all the directions and considerable change in the beam pattern which provide 3600 total coverage. Circular arrays are less sensitive to mutual coupling as compared to linear and rectangular arrays since they do not have edge elements. They can be used for beam forming in the azimuth plane for example at the base stations of the mobile radio communication systems as the components for signal processing. FFA design method of circular apertures for narrow beam width and low side lobes has been reported by Taylor. It includes the development of continuous circular aperture distributions, which contain only two independent parameters, A & , where A is related to th...
Circularly Polarized Array Antennas for Synthetic Aperture Radar
The L-band of LHCP and RHCP array antennas for circularly polarized synthetic aperture radar (CP-SAR) has been developed using simple corner-truncated square-patch elements. The corporate feed design concept is implemented by combining a split-T and a 3-way circular-sector-shape power divider to excite circularly polarized radiation. The fabrication of both antennas based on the simulation using the method of moment (MoM) gives a good circular polarization. Impedance bandwidth and 3-dB axial ratio bandwidth for LHCP are 6.1% and 1.0%, respectively, while for RHCP are 6.2% and 1.0%, respectively. The full antenna (four panels), will be installed on an Unmanned Aerial Vehicle (UAV) JX-1 in Center for Environmental Remote Sensing, Chiba University. In the future, CP-SAR is expected to improve the characteristics of conventional SAR system, especially to extract some new physical information on the earth surface.
Microstrip circular antenna array design for radar applications
International Conference on Information Communication and Embedded Systems (ICICES2014), 2014
The design and characteriztics of the double-sided microstrip circular antenna arrays are presented. The proposed array antenna are designed for single band at 5.25-5.75 GHz for C band and dual bands at 6.05-7 GHz and 9-10 GHz to support C band and X band Weather Radar applications respectively. The single band antenna shows omnidirectional radiation pattern with the gain value of 6.2 dBi at 5.5 GHz and dual band at 3.12 dBi at 6.5 GHz and 3.8 dBi at 9.5 GHz. The single band antenna array is placed on the top layer and the dual band antenna array is placed on both the top and bottom layers to obtain the desired antenna characteristics. The proposed single-sided single band and double-sided dual band antenna provides omnidirectional radiation pattern with high gain.
2009 NASA/ESA Conference on Adaptive Hardware and Systems, 2009
This paper analyses the effect of a central antenna element on the radiation pattern in a uniform circular antenna array. A modification of the array geometry is considered in which one of the antenna elements is placed in the center of the array. The corresponding array factor is adjusted to describe the geometric configuration that includes the central antenna element. This distribution alters the radiation pattern in such a way that the array directivity and half-power beamwidth are affected. An increase on the directivity and a decrease of the half-power beamwidth are obtained by adjusting the phase of the central element. A reduction of the side-lobe levels is also achieved. Array configurations with different number of antenna elements were tested as well, and the results on directivity and half-power beamwidth are presented. Using Microstripes, a software tool that enables the simulation of antennas, a 6-element circular antenna array was designed and the directivity for a range of frequencies was obtained.
Uniform circular arrays for phased array antenna
2011
This paper compares the performances of a number of uniform circular array (UCA) configurations for phased array antennas. A UCA geometry is targeted due to its symmetrical configuration which enables the phased array antenna to scan azimuthally with minimal changes in its beam width and sidelobe levels. Each UCA configuration consists of 19 isotropic elements. Particle Swarm Optimization (PSO) is used to calculate the complex weights of the antenna array elements in order to adapt the antenna to the changing environments. Comparisons are made in the context of adaptive beamforming properties and Signal to Interference Ratio (SIR). The results obtained suggest that a planar uniform hexagonal array PUHA (1:6:12) is suitable for high resolution applications as its sidelobe levels are the lowest compared to the other geometries.
Synthesis of Linear and circular array antennas using gatool
IOSR Journal of Electronics and Communication Engineering, 2012
The main aim of this paper is to reduce the first four side lobe levels (SLLs) of the linear and circular array antennas using gatool, which is the one of the simplest and efficient tool in MATLAB ®. This is employed in Radars and communications in order to reduce jamming effects, EMI and heavy clustering effects. Here amplitude of the elements of the antennas is taken as variables to control. And finally the design currents are given and sum and difference pattern plots for different number of elements for linear and circular array antennas. Simulation results are presented for above with rectangular plots. Successful applications show that gatool can be used as a general tool for pattern synthesis of arbitrary arrays.
SIDE LOBE REDUCTION OF CIRCULAR ARRAY USING TAYLOR DISTRIBUTION FUNCTION IN RADAR APPLICATIONS
The VHF/UHF band radar that using circular array antennas is a novel kind of radar, whose performances, such as angular accuracy, angular resolution, anti-jamming and low-altitude coverage capabilities are better than the conventional VHF/UHF band radar. On one hand, we focus on how the directivity of array element will influence upon the array pattern. The performance characteristics of the single microstrip patch antenna can be further enhanced by using microstrip patch antenna array. On the other hand, in order to lower the side lobe level (SLL) of circular array antennas , we investigate the effectiveness of amplitude-weighted methods including Taylor Window and Gaussian Window.
A Circular Equivalent Planar Array Configuration for 5.8 GHz Radar Application
AIP Conference Proceedings, 2020
As the spectrum demand increasing with time, so, the directivity and efficiency of antenna array now become a vital issue. Mostly, researchers have used a planar antenna array to get a high directive antenna with better performances. However, the planar array's gain is limited. It contributes high sidelobe levels and strong mutual coupling effects those need to overcome. In this paper, a new configuration of 4 elements circular equivalent planar array has been proposed to achieve high gain and directivity with lower sidelobe level. After being designed and simulated, the proposed antenna array has achieved high directivity of 15.3 dBi with 85 % radiation efficiency. Besides, the array has a maximum realized gain of 14.51 dB and low sidelobe level of-15.1 dB. In turn, the high directivity of the proposed antenna array resonating at 5.8 GHz with very minimum return loss makes it suitable for Radar application.