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Blindness removal in arrays of rectangular waveguides using dielectrically loaded hard walls

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2 Author(s)
Skobelev, S.P. ; JSC Radiophyzika, Moscow, Russia ; Kildal, P.-S.

We analyze an infinite planar array of open-ended rectangular waveguides in which the E-plane walls are loaded with dielectric slabs in order to create a hard boundary condition. The analysis is done by using the mode-matching method with Floquet modes in the exterior region. The results show that the hard walls remove the blind spots otherwise present in the element patterns of wide-angle scanning arrays. This occurs both for rectangular and for triangular lattices. In addition, the array becomes better matched to free-space in a rectangular lattice. In limited-scan arrays of large square waveguides, the use of the hard walls increases the array gain by 0.9 dB, it reduces the grating lobe level in the H plane by 11 dB and considerably decreases the difference between the array characteristics in the E and H planes

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Antennas and Propagation, IEEE Transactions on  (Volume:46 ,  Issue: 4 )