Invited Talk: Jing-Ya Deng, Xidian University

Special session 19:  Slow Wave Transmission Lines and Their Applications in Antennas and Microwave Devices

Short Bio: 
Jing-Ya Deng  received BE degree in Electronic Engineering and the PhD degree in electromagnetic field and microwave technology from Xidian University, Xi'an, China, in 2006 and 2011, respectively.
From 2011 to 2013, he was a Lecturer with School of Science, Xidian University. From 2013 to 2016, he was an Associate Professor with the School of physics and Optoelectronic Engineering, Xidian University, where he is currently a Full Professor since 2016. Dr. Deng is a recipient of the National Science Foundation for Outstanding Young Scholars of China. His current research interests include millimeter-wave antennas, devices and circuits, multibeam antennas, phased array antennas, and the high frequency/very high frequency (HF/VHF) antennas design and measurement.  

Title: Miniaturized Devices and Antennas Realized by Slow wave Structures

Abstract:
The rapid development of wireless communication systems requires miniaturization of microwave and millimeter wave devices and antennas. The slow wave (SW) propagation mode was realized by the slow wave structure (SWS) reducing the phase velocity of the electromagnetic (EM) wave. For a given frequency, the guided wavelength will be decreased, so longitudinal miniaturizations of transmission lines and circuits can be realized. Slow wave structures can also reduce the electrical lateral dimensions, as the cutoff frequency can be reduced due to the increased effective permeability or / and permittivity. By loading slow wave structures, such as metalized blind via holes and meandering strips, to the traditional transmission line, the equivalent dielectric constant or permeability of the transmission line increases, resulting in lowered phase velocity and the decreased guided wavelength of electromagnetic wave. Using slow wave transmission lines to design microwave devices can effectively reduce the size of microwave devices, achieving the purpose of device miniaturization. In this paper, several kinds of slow wave structures were reviewed, including blind via holes, microstrip polylines, lumped inductors, ring mushroom, and the combination of blind via holes and shorted patches. Then, a miniaturized SIW filter realized by slow wave structure is designed, which realizes 75% area reduction compared with normal SIW filter. Thirdly, two miniaturized horns are designed based on slow wave structures. The antenna gain is increased by adjusting the phase and magnitude distributions on the radiating aperture facilitated by slow wave structures. Finally, the application of slow wave structures for eliminating the grating lobes of antenna array is reviewed.