Compact EBG antenna

This paper discusses results from an ongoing study of creating compact dual band antenna structures for automotive and aerospace applications. A new dual band EBG element geometry is presented that is small compared to the wavelength yet has potentially sufficient bandwidth for mobile communication applications. The EBG was combined with a printed planar monopole to produce a structure 8 mm thick. The return loss and radiation patterns gave satisfactory performance at both frequency bands with bandwidths of 11% at 1500 MHz and 6% at 2500 MHz. There was suppression of the back radiation at both bands of 5 dB or better. CST Microwave Studio has been used for the simulation of the complete antenna with the EBG structure.