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A compact dual-band rectangular microstrip antenna (RMSA) is realized by two different single-slotted single-band rectangular microstrip antennas with slotted ground plane. Each open-ended slot in the single-slotted antenna is responsible to generate a wide impedance band that is shifted to lower frequencies by the effect of the ground slot. The length and position of each open-ended slot is varied to operate the antenna in a suitable resonant band (5. 15–5. 35 and 5. 725–5. 825 GHz). The proposed antenna meets the required impedance bandwidth, necessary for dual-band IEEE 802. 11a WLAN application (5. 125–5. 395 and 5. 725–5. 985 GHz). The dimension of the antenna (12 \, \, 8 \, \, 1. 5875 mm ^3) shows an average compactness of about 53. 73% with respect to a conventional unslotted rectangular microstrip patch antenna.
Chakraborty et al. (Wed,) studied this question.