A Low-profile planar monopole internal antenna for GSM/DCS/PCS/IMT/UMTS/WLAN/ISM/LTE operation in the Mobile phones

Abstract

In this paper, a novel low-profile planar monopole internal antenna for GSM/DCS/PCS/ IMT/UMTS/WLAN/ISM/LTE operation in the mobile phones is designed and developed. The proposed antenna is composed of multi-branches, F-shaped slots in the system ground plane and tapered feeding line which can improve the impedance matching at the feeding point. The antenna occupying a small area of 18.5 × 46 mm2 is placed on the top no-ground portion of the system circuit board, which makes it suitable for practical mobile applications. A prototype of the proposed antenna is fabricated and tested. In addition, the planar monopole antenna can provide two wide lower and upper bands to respectively cover the frequency range of 848–1152 MHz, and 1736–3000 MHz, for the GSM850/GSM900/DCS1800/PCS1900/IMT2000/UMTS2100/WLAN2400/ISM2450/LTE2300/LTE2500 operation in the mobile phone. Good radiation patterns and antenna peak gain for frequencies over the operating bands have been observed. The antenna is simulated and designed by using Ansoft HFSS and CST Microwave Studio. Details of the antenna design, results on the reflection coefficient, radiation characteristics, directivity, antenna gain, realized gain, and efficiency of the antenna are given and discussed. Finally, the specific absorption rate (SAR) of the proposed antenna placed at the bottom of the mobile phone is also investigated. The obtained SAR values meet the limit of 1.6 W/kg for the 1 g head tissue and 2.0 W/kg for the 10 g head tissue.

A Low-Profile Wideband Antenna for WWAN/LTE Applications

“…For example, in [2], a compact antenna comprised of a U-shaped loop, a T-shaped slot and a feeding line is presented for handset applications. However, the designed antenna possesses a large volumetric size of 64.5 × 135 × 0.6 mm 3 . For mobile phone applications, in [3], a low-profile internal antenna with a volumetric size of 46 × 88.5 × 0.8 mm 3 is reported.…”

“…However, the designed antenna possesses a large volumetric size of 64.5 × 135 × 0.6 mm 3 . For mobile phone applications, in [3], a low-profile internal antenna with a volumetric size of 46 × 88.5 × 0.8 mm 3 is reported. The presented antenna can exhibit dual operating bands ranging from 848 MHz to 1152 MHz and 1736 MHz to 3000 MHz.…”

“…This design is comprised of two symmetrical inverted-F antennae in addition of a T-shaped patch. However, the reported design possesses a large footprint of 60 × 15 × 5 mm 3 and can only support a 746-787 MHz band. In [7], a miniature balanced antenna is presented for mobile handset applications.…”

“…The antenna consists of a simple rectangular patch, a shorting pin and a meander line with a strip-like shape that can be mounted inside the portable devices. However, the antenna has an overall dimension of 76 × 3.5 × 1.524 mm 3 . In [11], a uni-planar tablet/laptop antenna that operates at GPS/GLONASS/LTE/WWAN bands is presented.…”

A nona‐band narrow‐frame antenna with a defected ground structure for mobile phone applications

“…Finally, Table shows that the antennas in References and this article do not use any lumped element, which has certain advantages for practical processing and application. Compared to the existing defected ground structure mobile phone antennas in References , this design uses a small defected ground structure (width 0.5 mm) relative to the substrate, to avoid the influence of the slot on the ground plane as much as possible. The detailed structure and specific dimensions of the antenna are provided in section 2 of this article.…”