Hello,
For my general knowledge can anybody tell me what do we mean by rotation of an antenna by some angle.? I have drawn 3D radiation pattern of an antenna and lets suppose I want to rotate it by some angle around any x,y,z axis. What I think of multiplying the radiation pattern by some rotation matrix. But I am confused what is the use of doing this as rotating antenna pattern with some rotating matrix will not change the pattern shape (or does it ?) just it will tilt to a new angle around some axis.
Every antenna is having more beam strength than in other directions.Rotating the antenna is only to improve the field strength in that particular direction which may need of strong signal transmission or weak signal reception.or to over come the path attenuation in that particular direction.The antenna rotation is highly related to the above two factors
If antenna rotation is made in the empty space, it is equivalent to a transition into a new orthogonal coordinate system. This transition is performed by multiplying the three-dimensional field vectors by the rotation matrix. The rotation matrix is always orthogonal matrix. The columns of this matrix represent the coordinates of the basis vectors from one coordinate system to another one. In other words, fields do not change. They are written in a different coordinate system. With best wishes.
Hi,
I found the following papers useful for a similar purpose.
Besides, you may take a simple example first (such as trying to rotate z-oriented dipole pattern), and rotate its pattern using the method in the papers(or any other equivalent method that you could find elsewhere), and then check the rotated pattern for desired result (as it is now easier to predict a dipole's rotated pattern cuts than some other complicated antenna, and there are closed form expressions for dipole like patterns for this exercise of mathematical manipulation of pattern).
Anyway, hope it helps.
Regards
Abhijit
Related Papers:
1)Y. Rahmat-Samii, "Useful coordinate transformations for antenna applications," in IEEE Transactions on Antennas and Propagation, vol. 27, no. 4, pp. 571-574, Jul 1979.
2) Feng-cheng Chang, "A novel approach to coordinate transformation in antenna design and analysis," Antennas and Propagation Society International Symposium, 1983, 1983, pp. 95-98.
3) C. Phongcharoenpanich, D. Boonrod and M. Krairiksh, "Radiation characteristics of inclined slot antenna on conducting spherical cavity," Communications, 2003. APCC 2003. The 9th Asia-Pacific Conference on, 2003, pp. 964-968 Vol.3.
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