Experimental evaluation demonstrates a 2.5-fold increase in input impedance bandwidth in low-profile cavity-backed slot antennas, suggesting effective bandwidth expansion without resizing.
A method of increasing the bandwidth of low-profile cavity-hacked slot and microstrip patch antennas without appreciably adding to the antenna dimensions is presented. This idea incorporates the stacking of structures which have close resonant frequencies. Energy is coupled between cavities via carefully placed slots in the common wall. An approximate two-and-a-half fold increase in input impedance bandwidth has been observed for a certain cavity-backed slot antenna.
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Smith et al. (1987) studied this question.
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