Design and Optimization of Compact Tri-Bandpass Filter by using Stub-Loaded Resonators for Augmented Reality Applications

Developing a tri-band filter significantly fulfills the increasing demand for reliable, high-speed connectivity. The significant need for such filters is improved performance and compact size. In recent technology, devices such as smartphones are employed for several 5G applications that need to operate at tri-band frequencies. Technology-changing technologies like GPS, Wi-Fi, and 5G are commonly integrated into various applications, for applications like Augmented Reality (AR), a tri-band pass filter is required. A Stub-Loaded Resonator (SLR) is used to achieve three distinct passbands at 1.57 GHz, 3.5 GHz, and 5.04 GHz, stub-loaded method has been employed to realize the triple-passband bandpass filter is designed with coupled open stubs between them to reduce the circuit area, which adds compactness to the filter. The structure is simulated with a High-Frequency Structure Simulator (HFSS) over the substrate FR4 of 4.4 dielectric constant and thickness of 1.6mm. This structure provides compactness along with improved passband characteristics.