Heptaband Inverted-F Antenna With Independent Resonance Control for Mobile Handset Applications

Abstract

In this letter, a compact inverted-F antenna (IFA) with independent resonance control is presented. The proposed antenna covers the heptaband (GSM850/900/DCS/PCS/UMTS/LTE2300/2500) for mobile handset applications. The proposed structure consists of four radiating branches. Each branch operates at a quarter-wavelength mode as the fundamental resonant mode, and the proposed antenna has quintuple resonant frequency (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> , f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> , f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> , f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> , and f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> ) characteristics. One remarkable feature of the proposed antenna is that each of the four resonant frequencies can be controlled independently without affecting the other four resonant frequencies (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sub> : harmonic of the fundamental frequency f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> ).