He has authored and co-authored over 200 journal and conference papers, and also two books, Microstrip Filters for RF/Microwave Applications (New York: Wiley, 1st Edition 2001, 2nd Edition 2011) and RF and Microwave Coupled-Line Circuits, Second Edition (Boston: Artech House, 2007). His current interests involve RF/microwave devices, such as antennas and filters, for wireless communications and radar systems, as well as novel material and device technologies including multilayer circuit technologies using package materials such as liquid crystal polymer, RF MEMS, ferroelectric and high temperature superconducting devices. He has served as the Subject Editor (microwaves) for IET Electronics Letters, the Associate Editor for IEEE Trans. Microwave Theory and Techniques, IET Microwaves, Antennas & Propagation, and Wiley International Journal of RF and Microwave Computer-Aided Engineering.

Latest Research

• Design of integrated wideband WR34‐band diplexer‐antenna array module for exploration of monolithic metal 3‐D printing for space applications
• Analysis of the Metal Plate Coupled Resonator With Its Compact In-Line Filter Design Applications
• A Wideband 90^∘ Phase Shifting Element Applied in Quadrature Phase Filtering Power Divider
• Development of an Unbalanced-to-Balanced Filtering Power Divider With Sequential Rotation Phase Characteristic
• Investigation of Metal 3-D Printed High-Q Multiband Waveguide Filters Using Spherical Resonators
• Design of Wide-Stopband and Dual-Band Filtering Crossovers Based on Mixed Substrate Integrated Waveguide Cavities