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Design of a High-Sensitivity Microstrip Patch Sensor Antenna Loaded with a Defected Ground Structure Based on a
1School of ICT Convergence, Daegu University, 201 Daegudae-ro, Gyeongsan 38453, Korea.
Sensors (Basel, Switzerland)
|December 16, 2020
Summary
This study optimized defected ground structure (DGS)-loaded patch antennas for material sensing. A double-ring CSRR DGS on a scaled-down patch antenna achieved the highest sensitivity for relative permittivity measurements.
Area of Science:
- Electromagnetics and Antenna Engineering
- Microwave Engineering
- Material Characterization
Background:
- Patch antennas are widely used for sensing applications.
- Defected ground structures (DGS) can enhance antenna performance.
- Optimizing DGS geometries and placement is crucial for improving sensitivity in dielectric material characterization.
Purpose of the Study:
- To comparatively analyze the sensitivity of various DGS-loaded patch antennas for relative permittivity measurement.
- To investigate the impact of DGS geometry, placement, and patch size scaling on antenna sensitivity.
- To identify the optimal DGS-loaded patch antenna configuration for enhanced dielectric sensing.
Main Methods:
- Simulated and fabricated conventional and DGS-loaded patch antennas.
- Investigated DGS geometries: rectangular slit, single-ring CSRR, and double-ring CSRR (DR-CSRR).
- Compared DGS placement (center vs. radiating edge) and patch size scaling.
- Measured antenna sensitivity with dielectric substrates (relative permittivity 1-10.2).
Main Results:
- The DR-CSRR DGS-loaded patch antenna on a radiating edge with a half-scaled patch size exhibited the highest sensitivity.
- Measured sensitivity of the proposed antenna was 4.91 to 7.72 times higher than the conventional patch antenna.
- The proposed antenna outperformed patch antennas with meander-line slots.
Conclusions:
- A scaled-down DR-CSRR DGS-loaded patch antenna offers significantly enhanced sensitivity for relative permittivity measurements.
- The optimal configuration involves placing the DR-CSRR DGS on the radiating edge of a scaled patch antenna.
- This optimized antenna design provides a superior solution for planar material characterization compared to conventional antennas.
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