Validation of compact antenna on motherboard based on an improved fast multipole method

On validating the performance of small-sized, multi-functionalized and complicated mobile antenna on motherboard efficiently, an improved scheme with combination of the Method of Momentum (MOM) and the Fast Multipole (FMM) is proposed in this paper. The essence of this newly forwarded scheme is apt to categorize the engaged base functions into one near field group and one far field group, the MoM is accordingly used to govern the count of the base functions in the near field group where data are stored necessarily; on the contrary, the FMM is used instead for counting the base functions in the far field group where data are stored unnecessarily. The antenna under validation (AUV) is an compact inverted-F antenna operated in the frequency range of the UMTS band from 1920MHz to 2170MHz, the Bluetooth/WLAN 2.4GHz band from 2400MHz to 2460MHz and the WLAN 5.8GHz band from 5725MHz to 5850MHz. The agreement between the calculation and the measurement regarding parameters S₁₁ and radiation patterns validates the efficiency and the accuracy of the proposed scheme as well as the performance of the AUV.