In this paper, a compact TE21 mode coupler is designed for tracking Low Earth Orbit Satellites. The tracking feed has to be employed to provide the error signal to servo systems feedback mechanism. The design incorporates the circular and eight rectangular waveguides with 13 asymmetric circular apertures on a single rectangular arm. The arrangement is small in size provides good return loss and VSWR The designed configuration presents return loss is better than -30dB and VSWR around 1.06 for frequency range of 25.5-27GHz. The designed model is simulated and analysed using CST

The fifth generation (5G) mobile communication technology though, is being deployed in various parts of the world to improve the wireless systems in terms of infrastructure and quality of services, in view of mobile communication history, the 5G may be unable to handle the deluge mobile network traffic of the future digital society. In general, new wireless technologies are introduced every 10 years, and services mature every 20 years, and therefore sixth generation (6G) mobile communication technologies, which have a great potential to impact on the market, are expected to be commercialized around 2030. In order to secure technological leadership in mobile communication, which is an essential infrastructure for everyday life and industrial sites, advanced countries around the world have begun to develop 6G technology. The expected main features of the 6G technology include: providing 10 to 100 times more performance than 5G, maximizing performance by utilizing the terahertz band which was not utilized by existing communication networks before, use artificial intelligence techniques for smart networking, and combining the previously isolated technologies. This paper provides an overview on the profile, advancements, implications, architecture, expected applications, and challenges of the futuristic 6G wireless communication systems described by innovative researchers and major global organizations.