A new planar antenna with double access and three separated bands is presented in this article. The first access operates over two bands, a narrow band for GPS standard (1.575 GHz), and a wideband covering PCS (1.85-1.99 GHZ) and UMTS (1.92-2.17 GHz) standards and also six sub-bands between (1.85-2.025 GHZ) intended to be used on the new norm 3GPP (LTE). The second access operates over a wideband covering WLAN applications (2.4-2.484 GHz) and the expected sub-band of LTE (2.3-2.4 GHz). In total, this antenna covers eleven standards. A new analysis method for bandwidth improvement techniques (parasitic patch) using the equivalent cavity modal analysis is also presented. Simulation and measurement results are proposed.