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

Abstract

In this study, a reconfigurable planar inverted-F antenna (PIFA) with a parasitic strip line for a hepta-band wireless wide area network (WWAN)/long term evolution (LTE) mobile handset is proposed. The PIN diode is located between the end of the parasitic strip line and the protruded ground plane. Depending on the on/off-state of the PIN diode, the degree of coupling between the conventional PIFA and the parasitic line is controlled and the fundamental resonant frequency of the proposed antenna is adjusted. As a result, the fundamental resonant frequencies cover the (global system for mobile communication) GSM850 (824-894 MHz) and GSM900 (880-960 MHz) bands. By the parasitic strip line extended from the protruded ground plane, impedance matching at the higher-order modes ( f 2 and f 3 ) is improved and the fourth resonant frequency f 4 is remarkably decreased. The high band of the antenna is formed by combining these three higher-order modes

Dual band frequency tunable planar inverted‐F antenna for mobile handheld devices

“…In Reference , the multiband behavior attained using nested capacitive slots in the antenna structure. Other techniques have been proposed in References 8 to 13, frequency tuning can be achieved using pin diodes, capacitive load, varactor diode, and RF MEMS switch. In References , the capacitive tuning technique is very impressive for extending the frequency without increasing the physical size of the antenna.…”

“…In Ref. , a reconfigurable PIFA with the parasitic strip line implemented for hepta‐band WWAN application, operating in LTE frequency bands, to provide a good impedance matching at higher‐order modes. In Reference , the reconfigurable PIFA antenna used in advanced LTE technology.…”

A multi to wideband frequency reconfigurable antenna

“…By changing the antenna's effective length using switching mechanism, the antenna covered a wide operating frequency range from 6 to 10.6 GHz. In, a conventional meander‐type PIFA is able to modify the effective antenna length by using a switch. Electrical length in on state is longer thus allowing the antenna to operate in multiband mode while in off state, the antenna is switched to operate in narrowband mode.…”

Realizing frequency reconfigurable antenna by ferrite-loaded half-mode SIW

“…The key advantage of RAs is its ability to satisfy the need for multifunctional operation, and then reduces the size and the cost of radio system. A great many studies have been contributed to RAs, but most are based on the electric reconfiguration, such as dual band varactor‐loaded slot patch antenna , compact reconfigurable dielectric resonator antenna , and the others . The electric reconfiguration needs extra complex circuits to supply electric power, which may connect with reconfigurable elements and then affect the performance of the RA.…”