Holey SIW Horn Antenna Based on an H-Plane Lenswise Wavefront Collimation

Abstract

This paper presents an H-plane SIW horn antenna whose directivity is enhanced using holey unit cells along the horn flaring. By wisely drilling the horn antenna, it is possible to reduce the phase error in the aperture which is a common problem in horn antennas if the optimum dimensions are not employed. An analysis of the distribution of the unit cells along the horn antenna has been carried out to achieve the desired equivalent refractive indices. By changing the hole radius, different equivalent refractive indices can be tuned with a wideband performance. This fact enables the implementation of a collimation zone inside the horn antenna which transforms the pseudo-circular wavefront into a quasiplanar one in the radiating aperture. The produced directivity is similar to the horn antenna with the optimum dimensions but a longitudinal reduction of 53.7% and a higher realized gain are achieved. A holey SIW horn antenna is designed and manufactured. The measured results show an impedance bandwidth performance below -10 dB from 34.3 GHz to 44.5 GHz (25.9%) with a realized gain above 10 dBi. The gain difference regarding a SIW horn antenna without the collimation zone is about 2-3 dBi in the operating frequency range.

High-gain H-plane SIW horn antenna loaded with dielectric slab for ku band low RCS applications

“…This paper presented high-gain, broadband SIW-based end fire antenna for tracking and navigation applications in the defence sector at Ku band regime (12)(13)(14)(15)(16). The designed antenna is straightforward, with simple coaxial feeding, low-loss and economical FR-4 substrate type loading; therefore, fabrication is simple and costeffective.…”

“…Further gain enhancement is required with phase corrections, which can be obtained by modifying the phase velocity in some areas of the horn flaring. In [12], the correction of the phase distribution in the aperture is achieved by drilling holes in the guide metallic plates, which modify the phase velocity in some areas of the horn flare. The improvement in impedance bandwidth (IBW) of 20% and peak gain of 11dBi at Ka band are reported in [13], where slanted slots along the SIW horn carry out the tuning of the phase velocity.…”

Structural and performance enhancement focused review of substrate integrated waveguide cavity backed antennas: The perspective of wireless and satellite communication

“…This unique design not only ensures an expansive bandwidth of 46% but also mitigates the concern of increasing the antenna's overall thickness. Another antenna design with perforated SIW horn aperture in [33] offers 26% bandwidth. An additional resonance is created near the main resonance by positioning a single metallic via near the half-wavelength slot.…”