A Novel Low-Profile Hepta-Band Handset Antenna Using Modes Controlling Method

Abstract

 Abstract-It is a challenging and tough task to achieve and tune multiple frequencies for handset antennas in a small area. In this communication, we have proposed a novel modes controlling method to build and tune the handset antenna. By combining different modes of an open slot and different monopole branches, a hepta-band, covering GSM850, GSM900, DCS, PCS, UMTS, LTE2300, and LTE2500, handset antenna is achieved in a small area of 8×60 mm 2 . The most essential merit of the proposed antenna is that the related modes can be added step by step, according to the operating bands. The modes for the lower and upper bands can be easily tuned and optimized. We have also built a prototype of the proposed antenna to validate the design strategy. The tested results include reflection coefficient, radiation patterns, efficiency, and gain.Index Terms-Handset antennas, multiple band antennas, modes controlling method.

Compact dual-band antenna based on CRLH-TL for WWAN/LTE terminal applications

“…1 To address this problem, various antenna design methods have been reported in recent years. [2][3][4][5][6][7][8][9][10][11][12][13][14] The proposed antennas with coupling feed in Refs. 2-4 can excite several resonant modes to obtain multiband operation.…”

“…To realize the wideband operation, a matching circuit, consisting of inductors and capacitors, is used in Refs. [6][7][8][9][10][11]. Besides, in Refs.…”

Compact octa‐band monopole antenna with independently tuning for WWAN/LTE mobile phones

“…To cover a wideband/multiband with a small size, the monopole antenna is a common choice for mobile phones . To cover multiple bands, the method of multiple branches is usually used .…”

“…To cover a wideband/multiband with a small size, the monopole antenna is a common choice for mobile phones . To cover multiple bands, the method of multiple branches is usually used . In , the 0.25‐wavelength mode of the longer branch is used to cover the lower band (704–960 MHz), the 0.75‐wavelength mode of the longer branch and the 0.25‐wavelength of the shorter branch are used to cover the higher band (1710–2690 MHz).…”

“…Many of the antennas aforementioned are using the longer branch's 0.25‐wavelength mode and high‐order (0.5/0.75/1‐wavelength) mode to cover the desired lower and higher bands, respectively, it is not easy to tune the higher band while keeping the lower band. In , an antenna with hepta‐band (GSM850, GSM900, GSM1800, GSM1900, UMTS, LTE2300, and LTE2500) is proposed by modes controlling method, thus, the frequency bands aforementioned can be tuned independently, however, the LTE700 band is not covered. The nonground portion heights of the monopole octa‐band antennas aforementioned are not less than 8 mm.…”