The antenna configuration and parametric investigation are conducted with the help of the high frequency structural simulator, and a good agreement is achieved between the simulated and measured data. The overall antenna dimension is at a lower resonance frequency of 9.08 GHz. The antenna is excited by a simple probe feeding mechanism. Two elliptical slots are introduced in the ground plane to increase the peak gain. The measured results show that the −10 dB impedance bandwidth of the proposed antenna at lower band is 5.02% (8.69–9.14 GHz), at middle band is 9.13% (10.47–11.48 GHz), and at upper band is 3.79% (11.53–11.98 GHz). The performance criteria of the proposed design have been experimentally verified by fabricating a printed prototype. By employing two rectangular slots that change the conventional rectangular patch into an inverted S-shaped patch, the antenna is able to operate in triple frequency in the X-band. A novel probe-fed compact inverted S-shaped multifrequency patch antenna is designed.
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