Investigation of Switchable Microstrip Line Open Stub Resonator Designs for Improved Isolation of SPDT PIN Diode Switches

Abstract

This study investigates switchable microstrip line open stub resonator designs aimed at improving isolation and miniaturizing the circuit size of Single-Pole Double-Throw (SPDT) PIN diode switches for wireless communication applications such as WiMAX and LTE at the 3.5 GHz band. The research employs a quantitative approach to analyze the impact of novel resonator configurations on isolation performance and size reduction. Five research questions address the effectiveness of different resonator designs, their impact on circuit miniaturization, and their performance evaluation using two-port network modeling, simulation techniques, and empirical validation. The results demonstrate that the first resonator design significantly enhances isolation, exceeding 30 dB, while the second resonator design achieves a 34% size reduction without compromising performance. Advanced two-port network modeling and simulation methodologies are validated against experimental results, confirming their reliability in predicting resonator behavior. The study highlights the importance of optimizing resonator design parameters to enhance isolation and compactness, contributing to improved efficiency in wireless communication systems. Future research should explore alternative materials and extended frequency bands to further refine resonator performance.