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Context 1
... vias are used whenever SIW is bended to improve the return loss. The overall layout is shown in Figure 4. We take the advantage of the 'fat' beam in H-plane of the lens antenna to cover the Elevation plane. ...
Context 2
... lens antenna gains over frequency measurements are shown in Figure 8. The gain discrepancy over the ports is due to the unequal feed lines' length as well as the different number of SIW bends as shown in Figure 4. There is also finite coupling losses between adjacent SIW lines, we try to put include as much shield via as possible to minimize this loss. ...
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Citations
... However, this increases significantly the cost and the loss of the system. An alternative that permits to increase angular range consists in using beam switching antennas with Lüneberg lens, Rotman Lens or with other types of beam forming networks [2][3][4]. ...
