PDF Cylindrical Antennas and Arrays

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The optimization of slot parameters is not goal of this paper but a numerical example are presented as illustrations of the proposed synthesis method. The results of array designs by the method of the least squares are verified by two computer simulation softwares, namely CST and HFSS. Introduction Train communication systems have received a considerable interest over the years, with tunnel connectivity providing an ongoing challenge due to the hostile environmental characteristics.

Development of Design Procedure 2. Conflicts of Interest The authors declare no conflicts of interest. Cite this paper Khayati, A.

Low-Sidelobe Phased-Array-Fed Cylindrical-Reflector Antenna - Tech Briefs

Open Journal of Antennas and Propagation , 5 , References [ 1 ] Santos, A. Please enable JavaScript to view the comments powered by Disqus. OJAPr Subscription. E-Mail Alert. OJAPr Most popular papers. History Issue. OJAPr News. Frequently Asked Questions. Recommend to Peers. Recommend to Library. Contact Us. All Rights Reserved. Santos, A. Emslie, A. Chen, W. Pisard, W. Poor, H. Silver, S. In general larger spacing leads to better correlation coefficient performance.

Correlation coefficient versus frequency at various spacing values for the two orthogonal-element array The dimensions of the proposed orthogonal-elements array after optimization of its element spacing are listed in Table 4.

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Table 4. The proposed antenna presents an impedance bandwidth of S parameters of the optimized two orthogonal-element MIMO array Figure 18 shows the computed radiation patterns of the proposed antenna at From these figures a broadside radiation patterns are observed. In the XZ-plane, the cross-polar radiations are lower by about 20dB in the broadside direction. The proposed MIMO antennas showed higher isolation as recommended. The second antenna array offered quite spatial and polarization diversities by orienting the radiating elements orthogonally and separating them by minimum distance.

Bandwidth improvement was achieved for both arrays when the mutual coupling is strong enough, or element spacing is small. It is concluded that, for a total bandwidth extending from 10GHz to A Abouda.


Sharma and S. Sulaiman, and S.

Gebril, S. Rahim, and A. Majeed, A.

Abdullah, F. Elmegri, K. Sayidmarie, R. Abd-Alhameed and J. Aras, M. Rahim, Z. Rasin and M. Brar and S.

Experimental demonstration of conformal phased array antenna via transformation optics

Sri Ramakrishna and L. Chair, A. Kishk, and K. Kwai-Man, L. Wai-Kee, and L. Blanch, J. Romeu and I. All rights reserved. Detailed parameters of the proposed antenna. Figure 1. Figure 2. Calculated reflection coefficient versus frequency for the proposed DR antenna.

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Figure 3. Realized gain versus frequency for the proposed DR antenna. Simulated reflection coefficient S11 results versus frequency for the two parallel-element array for various spacing d.

Simulated coupling coefficient S12 results versus frequency for the two parallel-element array for various spacing d. Detailed parameters of the proposed two parallel-element antenna.

Figure 8. Fusion device crosses threshold. The genetic algorithm is implemented on a PC that controls the eight-element cylindrical array.

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Experimental adaptive nulling with a genetic algorithm. The pulse is released vertically through a cylindrical array of fine tungsten wires 4 centimeters in diameter by 2 centimeters long. Nuclear blast in a can. Wideband omnidirectional printed dipole antenna with coupling feed for wireless communication applications.

The far-field radiation pattern produced by this M x N elements cylindrical array can be expressed as: Modified differential evolution algorithm for pattern synthesis of antenna arrays.