A. Bledowski et W. Zakowicz, RADIATION PROPERTIES OF A PLANAR DIELECTRIC WAVE-GUIDE LOADED WITH CONDUCTING-STRIP DIFFRACTION GRATING, IEEE transactions on microwave theory and techniques, 45(9), 1997, pp. 1637-1640
A dielectric planar waveguide periodically loaded with conducting stri
ps is considered as a possible antenna for millimeter-wave range. We s
how that separating the grating from the waveguide leads to the reduct
ion of radiative attenuation of the waveguided radiation and substanti
al narrowing of the angular spread of the diffracted radiation.