Directivity Evaluation of a Hemispherical Conformal Phase Array Antenna. By: Dr. Zamel A-K Al-Uzbaky

Directivity Evaluation of a Hemispherical Conformal Phase Array Antenna. By: Dr. Zamel A-K Al-Uzbaky

Email: azaidzamel@yahoo.com

Abstract- Phased array antennas consist of several radiating elements arranged and interconnected to produce directional radiation pattern. A conformal antenna is an antenna that conforms to something; it conforms to a prescribed shape. Conformal phased array antenna offers a unique capability of electronic scanning of the main beam in the space by changing the phase of the exciting currents in each element of the array. Conformal Array antennas have wide application in radar and radio communication, to day arrays at microwave frequencies and above are used extensively in mobile and satellite communication systems.

 In this paper cylindrical conformal array antennas are considered, some significant design parameters that affect the radiation patterns and directivity were evaluated and discussed. These parameters includes radius of the hemispher, the number of rings M, number of element radiators N in each ring as well as the spacing between the rings d, and the scanning angle , in addition to the current excitation amplitudes and phases. A MATLAB programs have been established to compute and plot the radiation patterns in polar plane and in three dimensions plane(3-D) for different design parameters. A numerical results of the directivity and half power beam width have been deduced from the antenna pattern for different. The obtained results give to the designers a suitable and optimal solution in the applications related to conformal phase array antenna .

Keyword : Phase Array Antenna, Conformal Array Antenna, Directivity. 

Directivity Evaluation of Conformal Array Antenna By: Zamel Abud Al-Kareem Al-Youzbaki

Abstract

Phased array antennas consist of several radiating elements arranged and interconnected to produce directional radiation pattern.

Array antennas have wide application in radar and radio communication, to day arrays at microwave frequencies and above are used extensively in mobile and sat communication systems.

The phased array antenna offers a unique capability of electronic scanning of the main beam in the space by changing the phase of the exciting currents in each element of the array.

Array antennas can be classified according to their distribution such as linear, planar, circular and conformal array.

In this paper cylindrical conformal array antennas are considered, some significant design parameters that affect the radiation patterns and directivity were evaluated and discussed. These parameters includes radius of the cylinder and the number of rings M, number of element radiators N in each ring as well as the spacing between the rings d, and the scanning angle q_o, in addition to the current excitation amplitudes and phases.

A mat-lab programs have been prepared to compute and plot the radiation patterns and their directivity in three dimensions and in tow dimension for various cases of the design parameters.

A numerical results of the directivity and half power beam width with the variation of the different design parameters can give the suitable and optimal solution of the array antenna design for different application.

Evaluation of Circular array antenna for Mobile Base Station to increase reverse-link capacity AK-Y-Zamel, & A.M. Abdulsattar: Iraq- Mousel-Alhdba University College

ABSTRACT

Circular phase array antenna has wide application in Mobile communication system for object to increase system capacity through reduction of co-channel interference caused by a single cell adjacent cells. These improvements in system capacity depend mainly on the antenna beam pattern and directivity and the process is a kind of spatial filtering, known by Space Division Multiple Axes ( SDMA). In this paper a theoretical calculation and MAT-LAB simulation was performed to evaluate beam pattern and antenna directivity considering different design parameters such as number of radiator element, circle radius, excitation current distribution, and beam scanning . This paper show also through MAT-LAB calculation, that by adopting such circular array antenna in Mobile Base Station, leads to improve the reverse-link capacity for a typical Direct Sequence Code Division Multiple Access (DS-CDMA) cellular mobile communication system.