Axial ratio reduced ultra wideband slot spiral on hybrid impedance surfaces

作者：Wang Zheyu; Karathanasis Konstantinos^*; Volakis John L

来源：Journal of Electromagnetic Waves and Applications, 2015, 29(2): 143-153.

DOI：10.1080/09205071.2014.981035

• axial ratio
• low-profile
• high impedance surface
• slot spiral

This paper presents a low-profile ultra wideband slot spiral antenna backed by a hybrid impedance surface. A unique aspect of the spiral is its hybrid impedance surface cavity leading to reduced axial ratio over a wide bandwidth. This is an improvement over conventional cavity-backed wideband spirals. Measurements demonstrated that the slot spiral on the proposed hybrid impedance surface achieved a 10:1 bandwidth from 0.6 to 6GHz with an axial ratio of <4dB. The cavity depth is only 13mm, corresponding to 0.03 lambda(600MHz) at its lowest operational frequency. As such, this slot spiral is attractive in enabling low-profile ultra wideband antenna with excellent RF performance for conformal and wearable applications.

• 出版日期2015-1-22