Design and implementation of microstrip patch antennas from narrowband to ultra-wideband with high interport isolation for in band full duplex communication systems

Official URL: https://risc01.sabanciuniv.edu/record=b2486378 _(Table of contents)

One of the most useful solutions for enhancing the throughput and spectral efficiency wireless communication networks is in band full duplex (IBFD) operation. Receiving and transmitting radio frequency (RF) signals simultaneously in the same frequency band is one of the best advantages of IBFD. However, there are many challenges for the implementation of IBFD operation; one of them is self-interference (SI). In general, the improvement of the throughput and the spectral efficiency of a communication system is directly proportional to high signal to noise ratio (SNR). To achieve a great SNR value, SI should be suppressed to noise floor. In IBFD communication systems, most of the SI cancellation is provided at the antenna side. Thereby, the implementation of an antenna with very high isolation offers a great solution for IBFD communication systems. In this thesis, the microstrip patch antennas from narrowband to ultra-wideband are designed and implemented to use in IBFD operation. The implemented 2.4 GHz and 5.8 GHz IBFD differential fed microstrip patch antenna arrays and 2.4 GHz IBFD double differential fed microstrip patch antenna achieve interport isolation of 53, 51 and 62 dB over their operating bandwidths of 50, 200 and 50 MHz, respectively. On the other hand, the implemented ultra-wideband (UWB) IBFD antenna provides interport isolation of 30 dB for its 4.9 GHz of 10 dB return loss bandwidth (2.3 – 7.2 GHz). This antenna may be used for all of the Wi-Fi bands including the next generation IEEE 802.11be whose possible need will be full-duplexity