Fig 1 - uploaded by Sadiq Ullah
Content may be subject to copyright.
Spherical coordinate system used in antenna measurements. Note that the intersection points on the surface grid represent the sampling positions for equal angle measurements. The points are the sphere partitioning method sampling positions.
Source publication
During antenna measurements the field pattern is typically sampled in discrete radiation directions and this inevitably affects the accuracy of the results. This paper considers the problem of sampling accuracy by taking an analytical solution for a thin dipole and numerically sampling using two different methods. The first assumes that the antenna...
Context in source publication
Context 1
... points. This is particularly relevant on ranges where there are large actuators and physical movement of the AUT is slow. The objective of the current paper is to explore the effects of sampling via two different methods with the aim of producing an accurate measurement with the minimum number of points. These methods are illustrated in Fig. 1 along with the conventional coordinate system used ...
Similar publications
Microwave holographic measurement technology is a common method used in antenna measurement. This method has high measurement efficiency and high precision. To evaluate and enhance the antenna’s performance, it is crucial to precisely determine the surface deformation. In this paper, the effects of feed offset error and scanning error on the antenn...
Citations
... To address this issue previously, [3] has worked on optimizing the amount of fixed increment in the two angles to meet an acceptable trade-off between accuracy and time complexity. Similarly, [6] has used the famous sphere partitioning algorithm by [7] to reduce the resolution of spherical sampling for reconstructing the radiation patterns. The overall goal of all of the current techniques is to minimize the number of data points needed for an antenna analysis. ...
In practice, the finite number of samples of the spherical radiation pattern or antenna gain are taken on the sphere for both the reconstruction of the antenna radiation pattern and the computation of mobile handset performance measures such as directivity and mean effective gain (MEG). The acquisition of samples is time consuming as the measurements are required to be collected over the range of frequencies and in multiple spatial directions. It is therefore desired to have a sampling strategy that takes fewer number of samples for the accurate reconstruction of radiation pattern and incoming signal power distribution. In this work, we propose to use equiangular sampling, Gauss-Legendre sampling and optimal dimensionality sampling schemes on the sphere for the acquisition of measurements of spherical radiation pattern of the antenna for its reconstruction, analysis and evaluation of performance parameters of the antenna. By appropriately choosing the spherical harmonic degree band-limits of the gain and the power distribution model of the incoming signal, we demonstrate that the proposed sampling strategies require significantly less number of samples for the accurate evaluation of MEG than the existing methods that rely on the approximate evaluation of the surface integral on the sphere.
This paper presents the design of dual-band frequency reconfigurable fork
shape planar dipole in the industrial, scientific and medical (ISM) band (2.4 and 5.2 GHz).
The proposed antenna can be used for wireless local area network (WLAN) applications.
Antenna operates in dual-band as well as single-band mode depending on switching
combination. The proposed antenna gives bandwidth of 12.5% and 6.7% for 2.4 GHz and
5.2 GHz, respectively, in dual-band mode while 15.5% for 2.4 GHz in single-band mode.
