Multiband microstrip antenna array for modern communication systems

This paper presents the design and development of a microstrip G-shape multiband antenna operating at 3.7 GHz, 5.2 GHz and 5.8 GHz. Moreover, in order to increase its gain, identical dual-element patch multiband antenna is also proposed. The array elements are fed by only one feed network, which improves the impedance bandwidth of the two element G-shape microstrip antenna. The choice of the radiating element shape depends on different factors such as: the radiated power, the multiband operation, the polarization type, the gain and the bandwidth. The array elements showed a peak gain of 4 dB at 3.7 GHz, 1 dB at 5.2 GHz and 5.2 dB at 5.8 GHz. The overall patch multiband array antenna has a compact dimension of 7.5×52.5 mm2. The comparison between the simulated and measured results showed a very good understanding, which implies the practical suitability of the proposed multiband antenna array design.