Quad-band Multiple Input Multiple Output Modified PIFA Antenna for WLAN and LTE Mobile Applications

In this article, a multiple input multiple output quadrate frequency bands modified PIFA antenna is introduced for ۴G LTE and WLAN applications. The quadrate proposed antenna covers LTE ۱۸۰۰ (۱.۷۱-۱.۸۸ GHz), LTE ۱۹۰۰ (۱.۸۵-۱.۹۹ GHz), UMTS (۱.۹۲-۲.۱۷ GHz), LTE ۲۳۰۰ (۲.۳۰۵-۲.۴۰۰ GHz), LTE ۲۵۰۰(۲.۵۰-۲.۶۹ GHz), WLAN (۲.۴۰۰-۲.۴۸۴ GHz- ۵.۱۵-۵.۷۵ GHz) specified by IEEE ۸۰۲.۱۱a/b/g/n/ac and WiMAX (۳.۳–۳.۶ GHz). Then, the PIFA antenna is used as ۲×۱ MIMO antenna as a radiation element.  The overall dimensions of the single antenna are ۵۰×۳۵×۰.۸ mm۳ and the MIMO antenna is ۵۰×۷۰×۰.۸ mm۳ while both are realized on FR۴-epoxy substrate. To reduce mutual coupling between PIFA antennas at MIMO configuration, Defected Ground Structure (DGS) along with parasitic double split ring resonator is used. The antenna performance is confirmed by the construction of the antenna prototype and measuring its characteristics in terms of reflection loss coefficient, gain, and radiation properties. The extracted outcomes show a good correlation between the simulation and experimental results that candidate it to satisfy mobile communication requirements.