Design of ultrawide band planar inverted-F antenna with slotted broad feed

Abstract

This article presents a low‐profile planar inverted‐F antenna (PIFA) for broadband applications. The proposed antenna geometry is simple and does not use any parasitic elements, which makes its fabrication easier. The antenna's radiator is composed of a top loading plate, broad feed plate, and a shorting plate; occupies a total volume of (L × W × H) 20 × 12 × 6 mm3. The proposed antenna design achieved the wideband characteristics by using the method of bringing resonances to proximity; furthermore, the low‐profile feature is achieved by removing some portion of the ground plane according to the volume ratio of PIFA. To validate the simulated results, an antenna prototype has been fabricated. The simulated and measured radiation patterns, gain, group delay, and simulated peak‐specific absorption rate (SAR) are presented. The measurement result demonstrates that the proposed antenna design achieved the maximum bandwidth of 142% (3.1–18.5 GHz) for |S11| ≤ −10 dB.