Groove Gap Cavity Slot Array Antenna for Millimeter Wave Applications

• Published in: IEEE transactions on antennas and propagation Vol. 67; no. 1; pp. 659 - 664
• Main Authors: Talepour, Z., Khaleghi, A.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-01-2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Antenna feeds; Antenna radiation patterns; Antennas; Bandgap structure; Cavity resonators; groove gap cavity; millimeter wave (mm-wave); Millimeter waves; Pins; Sidelobes; Slot antennas; slot array antenna; Technology utilization; Waveguide discontinuities
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2018.2879831

A cavity slot array antenna is designed and manufactured using gap waveguide technology. The array antenna is arranged in a single-layer metal structure without requiring any physical power divider network. The design implements high-order cavity modes for feeding the slot elements in a groove gap cavity. Thus, a single layer, moderate gain, low profile, lightweight, and low-cost antenna are resulted using the gap waveguide technology. A sample antenna with <inline-formula> <tex-math notation="LaTeX">4 \times 4 </tex-math></inline-formula> slot elements is designed and manufactured by implementing the TE 440 mode of the cavity. The antenna is fed via a coaxial line and operates at the center frequency of 37.5 GHz with the impedance bandwidth of 16%. The antenna has a broadside radiation pattern with a measured gain of 18 dBi and 3 dB gain bandwidth of 9.3%. The antenna sidelobe level is less than 12.6 dB at the center frequency.