Quasi-millimeter wave leaf-shaped bowtie array antenna backed by an EBG substrate

This paper presents a design of a quasi-millimeter wave array antenna consisting of a leaf-shaped bowtie antenna (LSBA) and a mushroom-type electromagnetic band gap (EBG) substrate. A four-element LSBA array backed by the mushroom-type EBG substrate is designed such that the array operates at the frequency band from 22 to 29GHz. In order to demonstrate the effective performance of the presented configuration, characteristics of the designed LSBA array are evaluated by the finite-difference time domain (FDTD) analysis. For comparison, the performances for the LSBA array backed by a perfect electric conductor (PEC) are also presented. From the simulated results, it is confirmed that the gain for the LSBA array with the EBG substrate is greater than that for the array backed by the PEC reflector within the operating design frequency band.