Novel Design of Cavity-Backed Slot Antenna by Reformed Ground Plane (Corner Notch and Stepped) and Elongated Mushroom (EM)-EBG
Keywords:
Cavity-backed slot antenna, corner notch ground, elongated mushroom EBG, stepped ground, surface currentsAbstract
A common problem for the performance of a Cavity-Backed Slot (CBS) antenna could be the heavily effect of ground plane. Travelling surface currents on ground plane could cause destructive effect on the characteristics of CBS antenna. This mainly appears on gain back lobe and also Front to Back Ratio (FBR) of pattern. To resolve this problem, the stepped ground plane and the Extended Mushroom Electromagnetic Band-Gap (EM-EBG) structure was introduced, which could minimize ground plane effects by changing the current distribution. Good agreement was achieved between the simulated and measured results. Experimental results showed that on a frequency range over 14-16 GHz, the gain was better than 11 dB and FBR of pattern in the H-plane reached to 26 dB.
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