研究目的
The aim of this paper is to present experimental results of a new approach to microstrip coupled-resonator bandpass filter design, introduced in [1], for S-band (2.7 – 3.1 GHz) microstrip bandpass filters of several four-resonator structures for pre-selectors of active phase array radar systems.
研究成果
Measurement results confirm good working ability of the used approach with total errors in center frequency and fractional bandwidth comparable or less than that of the conventional filter and reasonable error in transfer zeroes and rejection rate for quasi-elliptic structure.
研究不足
The quasi-elliptic structure is very sensitive to parameter variations, which could affect the rejection rate for higher frequencies. The study is limited to S-band (2.7 – 3.1 GHz) applications.
1：Experimental Design and Method Selection:
The paper introduces a new approach to bandpass filter design based on coupling coefficients calculation. Three four-resonator open-loop structures and a conventional parallel-coupled microstrip bandpass filter are designed for comparison.
2：Sample Selection and Data Sources:
The filters are designed for a come-at-able Arlon AD600 0.508 mm thickness substrate.
3：508 mm thickness substrate.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Arlon AD600 substrate, ADS LineCalc for calculations, ANSYS HFSS for full EM simulation, Rohde Schwarz ZVA-40 vector analyzer for measurements.
4：Experimental Procedures and Operational Workflow:
The design procedure involves calculating coupling coefficients, simulating the filters using ADS and ANSYS HFSS, producing the filters, and measuring their performance.
5：Data Analysis Methods:
The performance of the filters is verified through simulation and measurement, comparing the results with target parameters.
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