Multiple rhombus monopole antenna

Multiband and wideband monopoles constitute a research topic strongly motivated by the growing frequency spectrum needs in the area of wireless communication applications. In this paper, a multi-band, multiple rhombus shaped, monopole antenna is proposed as an alternative to the circular/elliptical disk/ring monopoles for broadband application. The simulation results are in good agreement with the measurement, showing a multiband behavior with good radiative properties. The scattering parameter S₁₁ exhibits four resonant frequencies close to f=1.68 GHz, 3.38 GHz, 6.58 and 13.85 GHz. The measured gain at these resonant frequency are respectively G= 3.1 dB, 4 dB, 6.3 dB, 6.9 dB.