Description:
After the very successful introduction of nearfield immunity testing with SBA 9113 and the flat elements 420NJ a demand for higher frequencies arose. While the 420NJ-elements are used from 360 MHz to 2.7 GHz, there are now flat elements available, which are covering the frequency range from 800 MHz to 6 GHz. The 422NJ-elements are fed using the balun of the SBA 9119 biconical antenna. Instead of the conical elements spacer sleeves and the flat 422NJ-elements elements are used. A high quality plastic bar is used as a fixation of the flat elements in both ways, parallel and perpendicular to the balun rod. Two knurled nuts are used to connect the radiating elements with the symmetrical feed terminals of the SBA 9119 balun. Further the elements are equipped with a spacer, which provides a repeatable spacing of 5 mm to the EuT's surface. The change of conical elements to flat ones or vice versa requires only a simple screwdriver and is typically done within two minutes. The flat elements can be arranged perpendicular or parallel to the mounting tube of SBA 9119, depending on the available space in the respective application.
Application:

The combination of SBA 9119-Balun with the flat elements 422NJ provides remarkable fieldstrength levels with moderate transmit power. With approx. 10 Watt transmit power one can reach fieldstrength levels of 300 V/m at a distance of 30 mm. This requires only a small adjustment of power over a wide frequency range. The recommended spacing between EuT-surface and 422NJ-elements is 30 mm. This spacing provides both, a high efficiency and good field uniformity. In most applications the EuT-surface is divided into a square shaped mesh, with the mesh width depending on the desired field uniformity. For each mesh crossing two frequency sweeped measurements with orthogonal polarisations are done. This procedure has to be repeated for each remaining mesh crossing, until the whole EuT-surface has been covered. Recommended mesh widths are around 30 to 50 mm.

Datasheet.pdf