Small‐size printed coupled‐fed antenna for eight‐band LTE/GSM/UMTS wireless wide area network operation in an internal mobile handset

Abstract

A simple small‐size printed antenna for eight‐band long‐term evolution (LTE)/GSM/UMTS wireless wide area network operation in an internal mobile handset application is proposed. Occupying a compact size of 15 × 40 mm2 on the ungrounded region of the system circuit board and a low profile of 4 mm, the presented antenna is a coupled‐fed configuration. With the longer branch of the feeding strip, a λ/4 resonant mode at around 2.7 GHz can be obtained to cover the desired LTE2500 operation. A fundamental λ/4 resonant mode over the desired lower band of LTE700/GSM850/900 can also be generated at 750 MHz by the long meandered coupling strip (length of about 113 mm). Moreover, two additional higher‐order resonant modes at around 1.75 and 2.25 GHz can also be obtained by the coupling strip. By including a chip inductor L at the feeding point, the impedance matching over the lower and upper bands can be improved in order to achieve the two wide operating bands of 698–960 and 1710–2690 MHz. With the following properties of small size, ease of fabrication and good radiation characteristics, the proposed antenna is a good candidate for the fourth LTE mobile phone applications.

Highly Compact MIMO Antenna System for LTE/ISM Applications

“…Figure 16(a) shows a 1 mm thick plastic housing which is used to simulate the practical case of the wireless terminals. In simulation, the relative permittivity of the plastic housing is set as 3.3 and the loss tangent is 0.02, the same as [23]. Figures 16(b) and 16(c) show the influence of the plastic housing on reflection coefficients and isolation.…”

Small-Size Folded Monopole Antenna With Switchable Matching Circuit for Ultra-Thin Mobile Applications

“…[13] 55×10×8 mm 3 700-1170/1705-2740 63-83/70-91 Ref. [14] 40×15×4 mm (704-960 MHz). Furthermore, when switching between the two states, the two upper resonant modes remain nearly constant at approximately 1800 MHz and 2378 MHz, and the 6-dB impedance bandwidth in State 1 for the higher operating band is 1690-2600 MHz, which is more than enough to cover the DCS1800/PCS1900/UMTS2100/LTE2300 operating bands (1690-2400 MHz).…”

“…To further illustrate the merits of the proposed antenna, Table 1 shows the comparison between the proposed antenna and those reported in [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Compared with the reference ones, the proposed antenna has exhibited the advantages of simple structure and small volume of 45×4.5×2 mm 3 (equivalent to 405 mm 3 ), with two broad bandwidths.…”

Reconfigurable PIFA with a parasitic strip line for a hepta‐band WWAN/LTE mobile handset

“…Accordingly, many internal antennas have been studied for generating a wide operating bandwidth. The performances of previously reported antennas and proposed antenna are summarised in Table 1 [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. To maintain their radiation performance, mobile handset antennas require electrical isolation from metal objects such as ground plane.…”

“…In addition, large ground clearance has limitations to practical mobile handset applications. In [12], the antenna covers the wide operating bands including LTE700 band by using coupled-feed technique. Nevertheless, this antenna is not suitable for recent mobile handset applications because it has a height of 4 mm and ground clearance of 15 mm.…”