Biplanar Monopole With DSPSL Feed and Coupling Line for Broadband Mobile Phone

A biplanar monopole with a double-sided parallel strip line (DSPSL) feed and coupling line for broadband mobile phone is presented. The proposed antenna consists of a DSPSL feed and a coupling line, suitable for broadband operation (824-960/1710-2620 MHz). It just requires a small area of 15 × 40 mm² on the circuit board, and it is configured along the boundary of the no-ground portion so that it can save much area, on which other electronic components can be put. The antenna is formed by a short strip line at the back side and a long strip line at the front. The overlapping part of them forms the DSPSL structure, which leads to a better impedance matching result. The long strip line contributes to cover the lower band (824-960 MHz), while the short strip line generates a resonant mode to cover the upper band (1710-2620 MHz). A coupling line alongside the long strip line and the ground are also formed to make the high resonant mode more effective. Details of the antenna are presented.