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SQUARE PATCH-BASED DIELECTRIC MICROWAVE ABSORBER

By A. Bhati, K. R. Hiremath, and V. Dixit

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Abstract:
The work presents a simple and novel design approach to extend the bandwidth of existing Dielectric Material Based Microwave Absorber (DMBMA). The design comprises planar square patches of DMBMA placed periodically on a metal-backed FR4 sheet. For demonstration purpose, the DMBMA is synthesized by adding conducting carbon fillers in polyurethane matrix, and its electromagnetic parameters are measured in X-band. A single reflection null is observed in DMBMA owing to λ/4 resonance. In comparison, the bandwidth of 8 GHz (10-18 GHz) is achieved for -10 dB reflection for square patch based DMBMA. The thickness of proposed absorber is 2.75 mm. An additional resonant mode is observed due to capacitive coupling between the square patches. The enhanced bandwidth is attributed to the overlapping of λ/4 resonance and induced coupling mode. A good agreement between the simulated and measured data is observed.

Citation:
A. Bhati, K. R. Hiremath, and V. Dixit, "Square Patch-Based Dielectric Microwave Absorber," Progress In Electromagnetics Research M, Vol. 63, 13-21, 2018.
doi:10.2528/PIERM17092402

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