A Hepta-Band Frequency Reconfigurable Antenna for Mobile Handsets with Impedance Matching Technique

A compact hepta-band frequency reconfigurable antenna (45 x 13.5 x 4 mm3) for mobile phone applications is proposed in this paper. The proposed antenna is constructed of folded strips. It is working in loop antenna and planar inverted-F antenna (PIFA) modes depends on the switching action of PIN diode. The proposed antenna operates over seven frequency bands (lower band (GSM 850, GSM 900), middle band (GSM 1800, GSM 1900, UMTS), upper band (LTE 2300, LTE 2500) with respect to −6 dB reflection coefficient. The proposed antenna is having three resonances in which lower and upper resonances are obtained with an impedance bandwidth of 23.28% and 18.9% when the antenna is working in PIFA mode, and middle resonance is occurred with an impedance bandwidth of 26.35% when the antenna is operating in Loop antenna mode. The antenna characteristics like reflection coefficient, radiation patterns, current distribution, and realized gain are presented in this paper.