A printed inverted-F antenna for wideband operation

Abstract

In this letter, a wideband printed inverted-F antenna is proposed. A rectangular element is loaded at the feeding line perpendicularly. A new additional resonance is produced by the loaded rectangular element. Also, the wideband impedance matching and the stable gain can be achieved. The simulated and measured impedance bandwidths with the 10 dB-return loss of the proposed inverted-F antenna are approximately 96.1% (2.33 GHz–6.64 GHz) and 100.5% (2.39 GHz–7.22 GHz), respectively. The dimension of the fabricated antenna is 0.31λ_L × 0.20λ_L (λ_L is a wavelength at the lowest frequency in the frequency range with the 10 dB-return loss). The proposed antenna is small in size.