Alexandria Engineering Journal (Oct 2023)
Bandwidth enhancement of substrate integrated waveguide cavity-backed half bow-tie complementary-ring slot antenna for Ku-band applications
Abstract
The proposed antenna introduces a wideband double-resonance substrate-integrated waveguide (SIW) cavity-backed slot antenna with shorting vias. The antenna is compact and has a wide frequency range. By loading the SIW cavity slot with shorting pin/vias, the authors describe the mechanism of operation and electric field distributions of the double resonance antenna. By etching the HBT-CRS at the center of the cavity, which creates the dual modes. One is an upward shift in the lowest mode (TE 120 mode or TE 210 mode) and a downward shift in the highest mode (TE 320 modes/TE 230 modes), and these two are paired together. As a result, the fabricated antenna has a very large bandwidth and a strong sense of double resonance. The antenna is designed, and then prototypes are built and tested. The key benefits are compactness, low fabrication cost, performance, and ease of integration with planar circuitry. SIW antennas are impactful in present wireless communication systems. A simulated double resonance design antenna with a low profile of 0.05 λ0 (free-space wavelength) has a bandwidth of 1.854 GHz (frequency range varies from 12.58 - 14.38 GHz and fractional bandwidth of 13.93%) and a peak gain of 6.56 dBi across the whole bandwidth while measured bandwidth is 2 GHz (frequency range from 12.5 - 14.5 GHz and fractional bandwidth of 14.81%) and the gain over the entire bandwidth is 6.46 dBi. In addition, the antenna has outstanding unidirectional radiation characteristics for Ku band applications.
