A Novel Printed Monopole Antenna with Stepped Impedance Hairpin Resonator Loading

In this paper, a novel printed monopole antenna loaded by a stepped impedance hairpin resonator (SIHR) with radial stubs is presented. By loading a SIHR at the bottom of the printed monopole antenna, a printed monopole antenna can be achieved. The resonant frequency of the proposed printed monopole antenna is reduced by the strong coupling between the SIHR and the printed monopole. By utilizing electromagnetic simulation software CST, the antenna is simulated and optimized. After the principle is stated, a sample antenna has been fabricated and measured to verify the predicted performance of our proposed antenna.