Design Investigation of a Laminated Waveguide Fed Multi-Band DRA for Military Applications

Abstract

In this paper a laminated waveguide fed DR Antenna is investigated. It can use for moderate power military applications. Cylindrical DRA is excited by two closely spaced asymmetric longitudinal slots on the broad wall of the laminated cavity are responsible for producing three different frequency bands. Parametric study of slots has been done with the help of commercial software ANSOFT HFSS. All the bands have sharp rejection. The final model of the antenna is simulated, fabricated and experimentally measured. Measured results are in quite accordant with design results. SIW feeding structures have small losses, moderate power handling capacity, low costs, compact sizes and can be seamlessly integrated with planar circuits. At all the bands 9.76GHz, 10.53GHz and 11.8GHz resonant frequency, the antenna shows 56 MHz, 160 MHz, and 250 MHz impedance bandwidth (for VSWR<2) with 6dB,6.2dB and 6.8dB gain respectively. Simulated and measured results reveal outstanding performance with a cross-polar level of 29dB lower than that of the co-polar level at 9.76GHz, the cross-polar level of 32dB lower than that of the co-polar level at 10.53, GHz, and similarly cross-polar level of 30dB lower than that of the co-polar level at 11.8GHz. © 2018 Walter de Gruyter GmbH, Berlin/Boston 2018.