 |
 |
|||
|
||||
 |
||||
|
Custom Antenna
|
 |
|
Antenna design and testing
|
| XWLAN have been testing antenna performance since 2001. These take the form of two types of test. The first is to directly compare the performance of different antennas connected to the same AP. The second is to mount each antenna in turn to our dual axis rotator. The antenna is then turned through 360˚ in the horizontal plane and 180˚ in the vertical. Signal strength samples are taken every 150mS and the resultant data is plotted to show the effective radiation pattern. This is useful in comparing antennas but more interesting when looking at the radiation pattern of directional antennas. Using this information the beamwidth of the antenna can be clearly seen which helps greatly in questions that may arise with the alignment of directional antennas. Additionally sidelobe strength and pattern can be seen clearly which is useful when trying to ascertain the level and direction of unwanted signal radiation. As a result of the years of research in this area XWLAN has designed many custom antennas such as the long Helix. The XWLAN standard gain feed horn. The XWLAN slot antenna. The new XWLAN patch for use in the proposed XWLAN array and sector antennas. Various concept antennas have also been created such as the Bow Tie Feed for a dish, a 2.4GHz discone as well as many more. Transmission lines and waveguides have also been tested for clients such as DLink and Cisco to see in ‘real life’ the effects different combinations of feed line and antenna have on signal propagation. |
 |
 |
 |
|
Small selection of antennas tested.
|
Comparison of Omni-directional antenna.
|
Prototype antenna radiation pattern from rotator survey.
|