Affiliation:
1. School of Physics Central South University Changsha People's Republic of China
2. School of Electronic Information Central South University Changsha People's Republic of China
3. State Key Laboratory of Millimeter Waves Southeast University Nanjing China
Abstract
SummaryThis paper proposes a wideband quasi‐reflectionless bandpass filter with high‐selectivity based on signal‐interference method. The bandpass filter is composed of a bandpass section and two absorptive sections, which consist of a quarter‐wavelength coupled line and signal‐interfering/resistively loaded path, respectively. The bandpass section mainly performs bandpass filtering characteristics while the absorptive sections are applied to consume the reflected signals. By virtue of rationally setting electric lengths and characteristic impedances of the absorptive section to form signal interference, signal dissipation within a wider frequency range and higher selectivity can be realized. Finally, the quasi‐reflectionless bandpass filter was designed and demonstrated with well‐matched measurement and simulation results. Compared with conventional works, the proposed bandpass filter can simultaneously attain wideband, high‐selectivity, and two‐port quasi‐reflectionless performance within a single‐layer topology and well‐integrated structure owing to the signal‐interference technology. The proposed technique may be extensively applied in the RF front‐end and decreases the effect on the stability of communication systems caused by reflected signal.
Funder
National Natural Science Foundation of China
State Key Laboratory of Millimeter Waves
Subject
Applied Mathematics,Electrical and Electronic Engineering,Computer Science Applications,Electronic, Optical and Magnetic Materials