Internal wireless wide area network clamshell mobile phone antenna with reduced ground plane effects

Abstract

In addition, parametric studies were performed to quantify the effects of height h between the radiation patch and the ground plate of the antenna on S 11 . From Figure 6, it can be seen that the whole resonant frequency decreases with the increase of h, which owing to the increased equivalent electric length of the antenna.The radiation pattern of the fabricated antenna was measured at 2.45, 5.2, and 5.75 GHz, which are shown in Figures 7-9, respectively. It can be seen that the radiation patterns at the three resonant frequencies showed omni-directional patterns in the x-y plane. At 5.75 GHz, the radiation pattern in the x-z plane was not exactly omni-directional; this is due to the effect of the ground plane. The peak gains of the antenna were 1.6 dBi at 2.45 GHz, 2.3 dBi at 5.2 GHz, and 4.4 dBi at 5.75 GHz. CONCLUSIONSA compact tri-band PIFA for WLAN and WiMAX applications has been proposed and the effects of dimensions have been studied. By using the F-T-shaped slots in the radiation patch and intro-ducing trapezoidal feeding plate, the three resonant modes are generated. The size of the fabricated radiation patch and ground plane are 25 Â 11 Â 8 mm 3 and 26 Â 40 mm 2 ; this is much smaller than a conventional inverted-F antenna. Because of its nearly omni-directional radiation pattern, the antenna has wide and potential applications for wireless communication applications.

Simple printed monopole slot antenna for penta‐band wireless wide area network operation in the mobile handset

“…While for higher frequencies at 1795, 1920, and 2045 MHz, more variations in the radiation patterns are observed, and there is a dip seen in the azimuthal plane (x-y plane). The obtained radiation patterns are similar to those of many reported internal WWAN handset antennas [30,31]. This suggests that the system ground plane in this study is also a part of the radiator and contributes significantly to the radiation characteristics of the mobile handset [32].…”

Small‐size WWAN monopole slot antenna with dual‐band band‐stop matching circuit for tablet computer application

“…Different from the reported band‐stop matching circuit used for lower‐band bandwidth enhancement only [1], the dual‐band band‐stop matching circuit in this study can generate two separate parallel resonances and lead to two dual‐resonance excitations of the quarter‐wavelength and higher‐order resonant modes of the monopole slot antenna to greatly enhance the bandwidths of both the antenna's lower and upper bands. Thus, with a small antenna size and a large ground plane (display ground in the tablet computer in this study) that the antenna is connected to, which generally cannot aid in enhancing the antenna's lower‐band bandwidth as the relatively small system ground plane in the handset as an efficient radiator [6–10], the proposed planar monopole slot antenna can cover the penta‐band WWAN operation in the 824–960 and 1710–2170 MHz bands. Moreover, note that the dual‐band band‐stop matching circuit is disposed on the ground portion on the FR4 substrate and requires no board space in the system circuit board of the tablet computer.…”

Thin Profile Wideband Printed Monopole Antenna for Slim Mobile Handsets Applications

“…All the above discussed bandwidth enhancement techniques create extra design complexities due to the non-planar structure and tuning of ground slots on the mobile circuit board. Meanwhile, the folded loop with chip element (inductor and capacitor) antennas for mobile handsets have also been studied [16][17][18][19][20]. The radiating structures of folded chip antennas consist of multiple layers.…”