A Triple-Band Slot Antenna by Using Balun Excitation and Ground Radiation

In this work, we have successfully designed and fabricated a triple-band grounded radiation antenna for applications of the multiple-system integration. An eight-like-loop slit is embedded in the ground. An eight-like-loop slit is etched in the ground plane to excite multiple resonant modes. Additionally, by embedding two rectangular slots at two terminals of the eight-like-loop slit, the capacitance of the ground plane resonator decreases such that the impedance matching condition in the upper-frequency band can be improved. Finally, a triple-band frequency response is derived by etching a simple matching circuit. The proposed antenna achieves the measured impedance bandwidths from 1.02 to 1.06, from 1.35 to 1.62, and from 1.96 to 2.55 GHz.