Research Projects

Multi-input multiple-output (MIMO) is a advanced technology that can increase data throughput without the need for additional bandwidth or transmit power. In MIMO communication, channel capacity increases proportionally to the number of antennas on the transmitter and receiver sides. However, this proximity leads to electromagnetic interaction and correlation, which can negatively impact MIMO communication performance. The millimeter wave (mmWave) spectrum offers vast frequency bandwidth, but it also has higher propagation losses, necessitating the use of high-gain antennas for MIMO implementation. mmWave MIMO antennas can achieve the 100x times data rate of current communication systems using spatial multiplexing, making it a key enabler of 5G wireless communication. MIMO antennas face mutual coupling due to radiation pattern overlap, signal leakage via surface current along the substrate, and coupling between feed lines through a common metallic ground plane. Techniques to reduce mutual coupling include electromagnetic band-gap and defected ground structures, neutralization lines, decoupling superstrates, orthogonal modes, and dielectric resonator antennas (DRAs). Substrate-integrated-waveguide (SIW) cavities are known for their low profile, easy integration, and self-consistent electrical shielding. The SIW-based fraction mode technique allows for more antennas in limited space with low mutual coupling due to self-consistent electrical shielding and size miniaturization. Another class of antenna, known as the DRA, is popular for high radiation efficiency and higher gain. The project aims to develop techniques to increase isolation, reduce correlation, and simultaneously realize high-gain antennas by integrating the SIW fraction-mode technique with DRAs. This integration would offer high gain, high isolation, and low correlated 4-ports/6-ports/8-ports MIMO antennas for mmWave applications.