Wide tunable dual-band reconfigurable antenna for future wireless devices

This paper presents a novel reconfigurable handset antenna for use in current and future wireless communication systems. The construction of the antenna is simple, allowing independent and versatile dual frequency and bandwidth reconfiguration, using simple external matching circuits. The antenna incorporates two metal elements which are capacitively coupled to excite resonant modes within the handset chassis. The antenna elements are located in close proximity to each other, and are connected via independent ports. The larger element is used to excite modes within the lowermost band of operation. The smaller element, on the other hand, excites resonances within the uppermost band. The matching circuit incorporates a pair of varactors and several fixed inductors. Simulations suggest that the antenna has a total tuning range of 2100 MHz (from 800 MHz to approximately 2900 MHz). In addition, the antenna is capable of operation as a penta-band cellular phone antenna. This kind of antenna is typically required to work within the GSM900, GPS1575, GSM1800, PCS1900 and UMTS2100 bands.