gain active microstrip antenna for 60-GHz WLAN/WPAN applications, ABSTRACT: A substrate integrated waveguide six-port directional coupler is designed and characterized. The circuit exploits a very compact size and good reflection and transmission characteristics, as it exhibits both return loss and isolation higher than 15 dB over a 13% bandwidth. The device is made by connecting all ports to a single junction which mixes all signals. Some prototypes have been built and experimental results show a very good agreement with simulations.ABSTRACT: A hybrid dual-antenna formed by an inverted-F antenna (IFA) and an open-slot antenna (OSA) for the 3.6-GHz LTE operation