Compact dual-frequency PIFA designs using LC resonators

In this paper, we report our investigation into single-feed dual-frequency planar inverted F antenna (PIFA) designs which make use of LC resonators (or RF traps), We introduce three basic methods for incorporating the LC resonator into the PIFA, including a variant of the meandering PIFA, Experimental results are provided and these show that dual-frequency operation at 900 and 1800 MHz can be achieved for all three designs.