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This research paper deals with the design of coaxial fed patch antennas with defected ground planes and square apertures. This antennas work for different applications applications such as Bluetooth, mobile communication, and biomedical applications.acceptable Specific Absorption Rate. It has resonating frequency at 2.45 GHz and bandwidth is 20%, so antenna has wide range of applications near 2.4 GHz bandwidth. There is slight deviation in theoretical result this is because of assumption made while calculation of S11(dB) such as slots and notches on the patch but actually it is square ring like structure.bandwidth.

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