Abstract :
A bandwidth enhanced technology for internal antenna of mobile terminals is proposed. The technology can improve bandwidth of ANT by means of deploying GND slots in PCBA. These cross slots in main board can zigzag the current flow so that the length of ground of main board is extended. The prolong ground can decrease low band resonant frequency while main board is not long enough to reach proper low band resonant frequency. The resonant frequency, bandwidth and return loss of antenna will be changed by the method. The modified factors can be slots´ amount, length, width and distance between each other. Increasing length and width of slots can shift resonant frequency to lower frequency. It can also be used for improvement of SAR performance.
