Compact Antenna with Frequency Reconfigurability for GPS/LTE/WWAN Mobile Handset Applications

Abstract

A compact frequency reconfigurable antenna for mobile handset application is proposed in this paper. The antenna consists of an inverted L-shaped feeding strip, a shorter grounded strip, and a longer grounded strip which is connected with four inductors by using a single-pole four-throw RF switch. When we change the working states of the RF switch, the corresponding inductor is connected with the long grounded strip and different resonant modes of the antenna can be realized. The measured −6 dB impedance bandwidth of the presented antenna is 683–960 MHz and 1460–2820 MHz, which is able to cover the LTE700/GSM850/900 and GPS/DCS1800/PCS1900/UMTS2100/LTE2300/2500 bands. The antenna gain, radiation efficiency, and radiation patterns are also described in the paper.

Design of a Dual-Band Antenna System for Lte-M and Lte-Mimo by Exploiting the Characteristic Mode Theory

“…Multi-band or tunable Inverted-F Antennas (IFA) using varactor or Pins diode for LTE-M and other high bands mobile terminal applications were proposed in [6][7][8][9][10][11]. But the use of IFA antennas forces to leave non-metalized parts on the ground plane, which makes it more sensitive to the environment and to the user's hand than the PIFA antenna.…”