Novel wide tunable dual-band reconfigurable chassis-antenna for future mobile terminals

This paper presents a novel reconfigurable chassis-antenna for use in current and future wireless communication systems. The antenna uses a pair of coupling elements which give independent and versatile dual frequency and bandwidth reconfiguration, using a number of external matching circuits. The matching circuit incorporates a pair of varactors and several fixed inductors. Simulations suggest that the antenna has a total tuning range of 2854 MHz (from 442 MHz to 2896 MHz). The antenna maintains a return loss above 6 dB, when tuning across this range. An equivalent circuit has been developed for the two port chassis-antenna. In the final section of the paper, the external matching circuit is connected to the equivalent circuit and the impedance behaviour is compared with that obtained through the antenna simulation with the matching circuit.