B K PANDEY et al : DUAL FREQUENCY
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Fig 10 Photograph of the developed 2×2 planar array antenna

Fig 11 Measured return loss of 2×2 planar array

Measured gain of 2×2 patch array at C-band is 12.51 dBi at center frequency 5.35 GHz and 2×2 slot array at X-band is 10.48 dBi at center frequency 9.6 GHz.