From a Simple IFA to a Dual Band PIFA

Printed inverted-F antennas (PIFA) are very popular choice of internal antenna for cellular handsets, owing to its ease of design to achieving multiple frequency resonances. When having multiple resonating frequency structure in a single embodiment, tuning of the resonant frequency can be very tricky. Lherefore, it is desired to have frequency independent tuning of two or more separate frequencies on a single structure. Once the key control element is identified, tuning can be easily managed. Lhis paper illustrates the design of a multi-band PIFA from a simple IFA.