research of PIFA

Single Feed Compact QuadBand PIFA Antenna forIEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 53, NO. 8, AUGUST 2005

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Single Feed Compact Quad-Band PIFA Antenna for Wireless Communication Applications
Dalia Mohammed Nashaat, Hala A. Elsadek, Member, IEEE, and Hani Ghali, Member, IEEE
Abstract―In this paper, a novel compact single feed quad-band planar inverted F-antenna (PIFA) is presented. Two techniques to reduce the physical size are illustrated. First, we insert U-shaped slits within the antenna-radiating surface. This forces the current to ow around the obstacles hence, reducing the resonant frequency. This technique reduces the size by about 30% from the original PIFA. Second, a capacitive plate is loaded between the radiating surface and the ground plane. The size is reduced more to reach 55% of the original. The rela