Effects of Substrate Permittivity on Planar Inverted-F Antenna Performances

Abstract

This paper quantifies the gain and matching bandwidth variations of a planar inverted-F antenna (PIFA) for several dielectric substrates. The performance of the PIFA is assessed in two configurations. First, the PIFA is studied with different substrates for a radiating patch of fixed dimensions of 4.92 cm x 2.13 cm. The effects of the dielectric constant of the perfect and lossy substrates on the resonant frequency, bandwidth and gain are investigated. A gain drop of 2 dB per decade is observed. In the second evaluation, the physical dimensions of the radiating element of the PIFA are adjusted to achieve resonance at 1.14 GHz. The gain drop reduces to 1.5 dB per decade.