Design of inverted-F antenna for long-term evolution-based wireless handhelddevices

Paulkani Iyampalam,Indumathi Ganesan

doi:10.3906/elk-1809-200

Abstract

In this article, a compact triple-band inverted-F antenna for long-term evolution (LTE)-based wireless handheld devices is presented. The proposed antenna comprises three arms, namely the radiating arm, shorting arm, and feeding arm. The structure of the designed antenna looks like an inverted F with folded L-shaped strip antenna. It has three resonant frequencies of 795, 2050, and 3405 MHz with a reflection coefficient of --11.7 dB, --15.1 dB, and --30.5 dB, respectively. The size of the suggested antenna is 10 $\times$ 35 $\times$ 0.8 mm$^3$ and it is built on the FR-4 substrate which is more compact and easy to integrate with the handheld devices such as laptops, tablets, and smart phones. The performances of the proposed antenna are analyzed with the help of computer simulation using Ansys High Frequency Structure Simulation Software Simulator (HFSS). The measured --10 dB impedance bandwidth of the suggested antenna covers 780--820, 2020--2070, and 3230--3490 MHz, which satisfies the LTE 700, LTE 2100, and LTE 3300. The proposed antenna has the acceptable voltage standing wave ratio (VSWR $\leq$ 2), bandwidth, gain, and radiation characteristics across the operating bands and thus proves its suitability for wireless handheld devices.

Highlights

With the expeditious development of wireless communication systems, there is a significant interest in providing more compact, small-size, and multiband antennas in wireless handheld devices
Artificial materials are integrated with the microstrip antennas to realize the electrically small antennas [1]
We propose a triple-band antenna with VSWR less than 2

Summary

Introduction

With the expeditious development of wireless communication systems, there is a significant interest in providing more compact, small-size, and multiband antennas in wireless handheld devices. Designing an internal compact antenna for multiple bands of long-term evolution (LTE) service in small handsets is still a serious challenge for the laptop, tablet and smart phones. Such internal antennas are required to cover the frequency bands of LTE 700, GSM850 (824–894 MHz), GSM900 (880–960 MHz), GPS (1575 MHz), DCS (1710–1880 MHz), PCS (1850–1990 MHz), UMTS (1920–2170 MHz), LTE 2300 and wireless local area network (WLAN) (2400–2484 MHz). The authors contributed hepta-band reconfigurable folded loop-inverted-F antenna for GSM850, GSM900, GPS, DCS, PCS, UMTS, and WLAN applications in [10] It consists of Philips BAP64-03 silicon PIN diode, biasing circuit, and matching bridge to achieve high bandwidth. The prototype of the antenna is fabricated and optimised using ANSYS HFSS v17

Antenna design

Findings

Conclusion