A uniplanar aperture-coupled slot dipole antenna capable of tri-band operation is presented. Design considerations for the three operating frequencies are extensively discussed. The lower and middle operating frequencies can be obtained by varying the lengths of the lower and middle pairs of the protruded slots, respectively, while the upper frequency can be determined by adjusting the lengths of the upper protruded slot pair and the coupling aperture pair. Within each band, slot-dipole-like radiation patterns, low cross-polarized radiations, and moderate antenna gains can be observed.
A modified slot dipole antenna fed by a coplanar waveguide for dual-frequency operation is presented. This antenna is formed by placing an additional slot dipole parallel to the coplanar waveguide-fed inductive slot dipole antenna, and inserting between them a pair of slot apertures shorter than the two slot dipoles. By varying the lengths of the protruded portions of these two slot dipoles, two operating frequency bands can be obtained. The tuning range of the frequency ratio of the two resonant frequencies is between 1.3 and 2.5. The proposed antenna possesses similar and well-behaved radiation performances in the two operating bands.
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