Small-Size Coupled-Fed Antenna With Two Printed Distributed Inductors for Seven-Band WWAN/LTE Mobile Handset

Abstract

A A A A compact compact compact compact small-size small-size small-size small-size coupled-fed coupled-fed coupled-fed coupled-fed antenna antenna antenna antenna with with with with two two two two symmetrical symmetrical symmetrical symmetrical printed printed printed printed meandered meandered meandered meandered inductive inductive inductive inductive strips strips strips strips as as as as two two two two distributed distributed distributed distributed inductors inductors inductors inductors for for for for seven-band seven-band seven-band seven-band operation operation operation operation covering covering covering covering the the the the GSM850

Antenna With Two Folded Strips Coupled to a T-Shaped Monopole

“…The 900/1800 MHz dual-band operation was once popular three decades ago. Nowadays, the bandwidth often mixes the UHF-WLAN bands with the LTE bands [1][2][3]. Sometimes, the SHF-WLAN band may also be included [4][5][6].…”

“…The T-shaped strip-monopole in [3,4] is coupled to the coplanar meandered strips. The wide-band characteristics of a wide rectangularmonopole have been discussed in [12].…”

Small-Size Seven-Band WWAN/LTE Antenna with Distributed LC Resonant Circuit for Smartphone Application

“…At present, there are already a lot of researches about multiband mobile phone [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] and tablet computer [17,18] antennas, including GSM850 (824-894 MHz), GSM900 (890-960 MHz), GSM1800 (1710-1880 MHz), GSM1900 (1850-1990 MHz), UMTS2100 (1920-2170 MHz), LTE2300 (2305-2400 MHz), and LTE2500 (2500-2690 MHz). When the internal antenna occupies too much space, it will affect the installation of other GPS or Bluetooth antennas, induce a strong coupling of the multiple antennas, and reduce the communication quality [2].…”

“…When the internal antenna occupies too much space, it will affect the installation of other GPS or Bluetooth antennas, induce a strong coupling of the multiple antennas, and reduce the communication quality [2]. In order to better achieve the miniaturization and multiband, many technologies have been studied, such as coupling feed technology [3][4][5][6][7]17], slot loaded technology [8,17], reconfigurable technology [9,10], a parallel resonant loaded technology [11], double planar inverted-E (PIE) feed structure [12], loading the matching network [13,14,18], loading lumped elements technology [18], and loading printed distributed inductance technology [15,16]. Table 1 lists the dimensions and performance of WWAN/LTE antenna for the same frequency bands and applications in recent works.…”

Two-Strip Narrow-Frame Monopole Antenna With a Capacitor Loaded for Hepta-Band Smartphone Applications

“…Until now, various types of technologies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] have been proposed for multi-band smartphone applications, such as loaded lumped chip elements [4,5], distributed inductive strips [6,7], coupled-fed feeding [8][9][10][11][12][13], LC matching circuits [14][15][16], parallel resonant structures [17,18] and reconfigurable antennas [4,19,20]. All these technologies can reduce the sizes of the antennas and enhance the operating bandwidth.…”