Substrate integrated waveguide slot-fed grid array antenna

Abstract

A planar substrate integrated waveguide slot-fed microstrip grid array antenna for the frequency range 76-81 GHz is presented. The antenna is realized on a standard soft RF substrate. It is fed using a transverse slot in a substrate integrated waveguide on a separate substrate layer below the antenna. A wideband microstrip to substrate integrated waveguide is designed to feed the antenna. Measurement results show a 12% S11<-10 dB bandwidth.

Aperture coupled stacked patch thin film antenna for automotive radar at 77 GHz

“…Comparing the multilayer PCB antennas, the designs in [4], [12] and [13] achieve a much higher gain, aperture and radiation efficiency (for the design in [13] no radiation efficiency is reported) than the the one in [6]. In terms of aperture, all designs use grid array radiating aperture.…”

“…Similarly in [12] and [13], the feed network originates on the bottom substrate layer, and multiple substrate layers below the radiating layer are used for it. In [6], the feed network originates on the top substrate layer, transfers energy to the second and third substrate layer through SIW structures, before terminating in a slot feed. The length of the feed network is much longer which results in higher losses.…”

“…As examples, antenna concepts investigated by the authors, as well as other designs reported in the literature are used. For multilayer PCB-based antennas, the designs from the authors include coaxial fed variable width grid array antenna [4] and SIW slot fed grid array antenna [5] As examples of other designs reported in the literature, multilayer grid array antennas reported in [12] for 79 GHz operation and [13] for 60 GHz operation are used. For the hybrid approach, the aperture coupled stacked patch antenna presented in this work and the stacked grid antenna [6] are used as examples.…”

“…Due to single sided feeds and linear arrays, such antennas also have relatively narrow radiation pattern bandwidths. Recent multilayer antenna designs employing wideband antenna elements such as the grid array antenna [3], [4], [6], when used as linear arrays fed in the center, have larger impedance bandwidths as well as larger radiation pattern bandwidths. Such designs rely on multilayer PCB and hence are more expensive and complex to manufacture than single layer PCB designs.…”

Hybrid Thin Film Multilayer Antenna Automotive Radar at 77 GHz

“…Due to single sided feeds and linear arrays, such antennas also have relatively narrow radiation pattern bandwidths. Recent multilayer antenna designs employing wideband antenna elements such as the grid array antenna [3], [4], [5], when used as linear arrays fed in the center, have larger impedance bandwidths as well as larger radiation pattern bandwidths. Such designs rely on multilayer PCB and hence are more expensive and complex to manufacture than single layer PCB designs.…”