研究目的
To present four frequency selective surfaces (FSSs) for use in an instantaneous frequency measurement (IFM) system, demonstrating their ability to function as frequency discriminators with a resolution around 300 MHz and covering 16 distinct frequency sub-bands between 3.21 and 8.75 GHz.
研究成果
The new setup for the 4-bit IFM systems using FSS as FD presented the characteristics required to identify a frequency within a sub-band. Good agreement between simulated and measured frequency responses was obtained, with minor shifts that can be compensated for by small changes on the frequency range of the sub-bands without damaging the performance of the system.
研究不足
Minor shifts in the measured frequency responses due to imperfections in the fabrication process and limitations on the measurement setup.
1：Experimental Design and Method Selection:
The study employs FSSs based on simple dipoles designed to have a frequency response corresponding to frequency discriminators. The design and simulation of FSSs were conducted using CST Microwave Studio.
2：Sample Selection and Data Sources:
The FSSs were fabricated with dimensions of 21 cm × 21 cm on an FR-4 substrate. Measurements were taken using an Agilent E5071C Vector Network Analyzer and two SAS-571 double ridge guide horn antennas.
3：List of Experimental Equipment and Materials:
Agilent E5071C Vector Network Analyzer, SAS-571 double ridge guide horn antennas, FR-4 substrate (h = 1 mm, εr = 4,3, tanδ = 0.025).
4：025).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The FSSs were placed in a panel with a slot of 20 cm × 20 cm, and measurements were taken with the antennas spaced by 1.2 m. Absorbers were used to prevent undesired reflections.
5：2 m. Absorbers were used to prevent undesired reflections.
Data Analysis Methods:
5. Data Analysis Methods: The simulated and measured S21 parameter results were compared to validate the frequency response of the FSSs.
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