About the Event
Nowadays miniaturized low-power electronics and wireless devices are ubiquitous in everyday life. However, there is still significant interest to further reduce size, lower the power and improve data rate required by such systems. For such goals, antennas still constitutes a major bottleneck in terms of size, efficiency, polarization and radiation pattern. Also for many near ground applications, low profile small antennas with vertical polarization are needed to achieve much lower propagation path loss.
Conventional approaches to reduce the height of monopole antennas cause significant drop in efficiency and polarization purity. Two novel miniaturization techniques to enhance the performances are presented for different levels of size reduction (λ/300 < h < λ/50 where h is antenna height). Also, radiation pattern deformation caused by low profile configurations on a small ground plane is addressed and to solve this problem, novel designs using vertically and horizontally balanced architectures are introduced. For GPS or mobile platforms where the aforementioned miniaturized antennas with vertical polarization cannot provide reliable communication connectivity, a new miniaturization technique to reduce the size of circularly polarized (CP) patch antennas is presented, which achieves 75% size reduction compared to a conventional patch antenna while the smallest CP patch antenna reported in the literature reaches only 50% size reduction. Lastly, a novel approach to combine the miniaturized monopole and patch antenna elements into a compact common aperture diversity antenna is presented for multiple-input and multiple-output (MIMO) applications.