In this paper, a multiband microstrip antenna of compact size (0.2 × 0.25 \(\:{\lambda\:}_{0}^{2}=0.05{\lambda\:}_{0}^{2}\) \(\:\text{a}\text{t}\:\text{l}\text{o}\text{w}\text{e}\text{r}\:\text{r}\text{e}\text{s}\text{o}\text{n}\text{a}\text{n}\text{t}\:\text{f}\text{r}\text{e}\text{q}\text{u}\text{e}\text{n}\text{c}\text{y}\:1.63\:\text{G}\text{H}\text{z}\) ) is designed by loading multiple notches in the patch of antenna. The patch of antenna consist two L-shaped and two rectangular shaped notches. The modified patch of antenna provides triple resonating bands from 1.58 to 1.71 GHz, 1.89 to 2.06 GHz and 2.81 to 2.93 GHz under the − 10 dB scale resonating at frequency 1.63 GHz, 2 GHz and 2.87 GHz respectively. The bandwidth of triple band antenna is obtained 7.9% (130 MHz), 8.61% (170 MHz) and 4.18% (120 MHz) with − 16.6 dB, − 26.99 dB and − 31.88 dB reflection coefficient at resonating frequency. The lower and middle resonances are due to L-shape notches while higher resonance is due to rectangular shape notches. The presented antenna is fed by microstrip line feed of 50 Ω and the simulation is performed by IE3D software. It shows 2.6−3.1 dB, 2.9−3.5 dB and 4.2−5 dB simulated gain and 85−93%, 87−95% and 88−96% antenna efficiency in three resonating bands. The three resonating bands of proposed antenna can be used for the application of different wireless communications in L and S-bands. The proposed work is also compared with the previous published articles to find out the improvement.
