研究目的
To demonstrate a new class of highly selective bandstop ?lter based on cascading two identical lossy hybrid dual-band bandstop ?lters of low resonator Q factor.
研究成果
The proposed ?lter prototype can produce two high rejection bands with ?nite low Q resonator factors, leading to achievable miniaturization and cost reduction. The measured result shows that two stages lossy DBBSF can achieve higher stopband rejections about 1.5 times greater than that of a single stage prototype.
研究不足
The higher measured passband loss is due to the loss performance of the circulator and the low Q microstrip. The discrepancy of the rejection bands may be due to the tolerant in fabrication and higher stage connections of the two prototypes.
1：Experimental Design and Method Selection:
The methodology involves synthesizing a 4th order hybrid dual-band elliptic ?lter network using multi-stage predistortion re?ection mode technique.
2：Sample Selection and Data Sources:
The ?lters are fabricated and realized on microstrip planar structure.
3：List of Experimental Equipment and Materials:
RT/Roger Duroid 5880 microstrip substrate, surface mount circulator (UIYSC25A825T885 from UIY Technology), ZVL network analyser from R&S, Advanced Design System (ADS) from Keysight Technologies.
4：Experimental Procedures and Operational Workflow:
The hybrid dual-band lowpass network function is formed by the product of two elliptic lowpass and highpass network functions, predistorted, and synthesized.
5：Data Analysis Methods:
The performance is measured using ZVL network analyser and simulated using ADS software.
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