Abstract
A novel dual-band co-aperture planar array antenna is proposed in this letter. The radiating elements operating at a higher frequency band are grouped and reused for the lower frequency band by adopting the concept of segmented patches. A total of $4 \times 4$ “H”-shaped patches, fed by two independent microstrip-feeding networks through rectangular slots, are taken as the radiating elements for a $4 \times 4$ higher-band array antenna, and simultaneously as the radiating elements for a $2 \times 2$ lower-band array antenna. Although the frequency ratio of the higher band to the lower band is over 2, grating lobes are avoided. A validation model is fabricated, and measured results demonstrate a working bandwidth of 8.8 ${\%}$ from 5.4 to 5.9 GHz and another working bandwidth of 7.3 ${\%}$ from 13.2 to 14.2 GHz. The reflection coefficients are less than $-$ 10 dB and the radiation efficiencies are higher than 65 ${\%}$ throughout both frequency bands.
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