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A uniplanar hexagon electromagnetic band-gap structure for circuit size reduction applications

This paper presents a new uniplanar hexagon EBG structure for circuit size reduction applications. The EBG is placed at the ground plane of the microstrip line to increase the distributed capacitances and inductances for slowing the wave propagation. The simulations are performed by the commercial software using finite-element-method (FEM) to check the insertion loss and the slow wave behavior for passband, and the rejection for the stop band. These simulation results are confirmed by the measured data. A typical 3 dB ring coupler in printed-circuit-board (PCB) is analyzed and designed at 5 GHz to show the availability of the proposed EBG structure, with verifications of experiments.