Abstract
A compact filtering planar inverted-F antenna (PIFA) with two radiation nulls is presented. Firstly, a PIFA is designed at the center frequency of 2.5 GHz. The conventional PIFA has a gradual frequency response. Then, a coupling quarter-wavelength resonator is designed to create one radiation null at the lower frequency band. At last, a defected microstrip structure resonator is applied to create the other radiation null at the upper frequency band. The simulated two radiation nulls are located at 1.44 GHz and 3.92 GHz, while the measured two radiation nulls are located at 1.37 GHz and 3.92 GHz. The created two radiation nulls can improve the frequency selectivity greatly. Moreover, the effects of two radiation nulls on the radiation band are very small. Measured and simulated results agree well.
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