A MIMO antenna using interdigital technique for LTE and Wi-MAX on mobile applications

Demand of high data rate and channel bandwidth is concerned for modern wireless communication systems. All applications are rapidly shifting towards multiple input multiple output (MIMO). This paper focused on MIMO antenna using interdigital technique for GSM, 4G LTE and WiMAX on mobile applications. Interdigital capacitor technique can control the second harmonic as desired and reduce size of antenna from λ/2 to λ/4. However, this antenna has unidirectional radiation in both 0 and 180 degree directions. The fabricated antenna can be operated at GSM, 4G LTE (1.71-1.88 GHz) and WiMAX (3.6-3.8 GHz) frequencies with return loss (S₁₁) below -10 dB. The simulation gain is 3.0 dB. The antenna is designed on an FR-4 substrate. The experimental results of the fabricated antenna agree very well with simulation expectations using CSTpackage.