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In this paper, a printed loop antenna with current reconfiguration technique is proposed to improve the usability of the loop as a multiband antenna for UWB applications ranging from 3.1 GHz to 10.6 GHz. The current reconfiguration is achieved using a capacitive gap along the circumference of the loop antenna. The shift in the location of the capacitive gap changes the current distribution in the antenna and new bands are generated. It is found that using a single capacitive gap along the loop, the antenna can be operated as a wide band antenna whose frequency ranges from 6 GHz to 10.8 GHz with % bandwidth of 57. The proposed loop can also be used as dual and triple band antenna in the frequency range from 6 GHz to 10.8 GHz by simply switching ON and OFF the switches. The proposed antenna generates the highest numbers of bands at the minimum expense of switches. The proposed loop without capacitive gap is capable of covering only 24% out of the 3.1 GHz-10.6 GHz range. The range of band can be varied from 24% to 57% using the switches. The proposed antenna very well rejects the WLAN and WiMAX bands.

Capacitive Gap Loaded Dual, Triple and Wide Band Loop Antenna *